/* libguestfs
- * Copyright (C) 2009 Red Hat Inc.
+ * Copyright (C) 2009 Red Hat Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
#include <config.h>
#define _BSD_SOURCE /* for mkdtemp, usleep */
-#define _GNU_SOURCE /* for vasprintf, GNU strerror_r */
+#define _GNU_SOURCE /* for vasprintf, GNU strerror_r, strchrnul */
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <stddef.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
+#include <sys/stat.h>
#include <sys/select.h>
+#include <dirent.h>
+
#include <rpc/types.h>
#include <rpc/xdr.h>
#include "guestfs.h"
#include "guestfs_protocol.h"
-static void error (guestfs_h *g, const char *fs, ...);
-static void perrorf (guestfs_h *g, const char *fs, ...);
-static void *safe_malloc (guestfs_h *g, int nbytes);
-static void *safe_realloc (guestfs_h *g, void *ptr, int nbytes);
-static char *safe_strdup (guestfs_h *g, const char *str);
+#ifdef HAVE_GETTEXT
+#include "gettext.h"
+#define _(str) dgettext(PACKAGE, (str))
+#define N_(str) dgettext(PACKAGE, (str))
+#else
+#define _(str) str
+#define N_(str) str
+#endif
+
+#define error guestfs_error
+#define perrorf guestfs_perrorf
+#define safe_malloc guestfs_safe_malloc
+#define safe_realloc guestfs_safe_realloc
+#define safe_strdup guestfs_safe_strdup
+#define safe_memdup guestfs_safe_memdup
static void default_error_cb (guestfs_h *g, void *data, const char *msg);
-static void stdout_event (void *data, int watch, int fd, int events);
-static void sock_read_event (void *data, int watch, int fd, int events);
-static void sock_write_event (void *data, int watch, int fd, int events);
+static void stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
+static void sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data, int watch, int fd, int events);
-static int select_add_handle (guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
-static int select_remove_handle (guestfs_h *g, int watch);
-static int select_add_timeout (guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
-static int select_remove_timeout (guestfs_h *g, int timer);
-static void select_main_loop_run (guestfs_h *g);
-static void select_main_loop_quit (guestfs_h *g);
+static void close_handles (void);
-#define UNIX_PATH_MAX 108
+static int select_add_handle (guestfs_main_loop *ml, guestfs_h *g, int fd, int events, guestfs_handle_event_cb cb, void *data);
+static int select_remove_handle (guestfs_main_loop *ml, guestfs_h *g, int watch);
+static int select_add_timeout (guestfs_main_loop *ml, guestfs_h *g, int interval, guestfs_handle_timeout_cb cb, void *data);
+static int select_remove_timeout (guestfs_main_loop *ml, guestfs_h *g, int timer);
+static int select_main_loop_run (guestfs_main_loop *ml, guestfs_h *g);
+static int select_main_loop_quit (guestfs_main_loop *ml, guestfs_h *g);
-/* Also in guestfsd.c */
-#define VMCHANNEL_PORT 6666
-#define VMCHANNEL_ADDR "10.0.2.4"
+/* Default select-based main loop. */
+struct select_handle_cb_data {
+ guestfs_handle_event_cb cb;
+ guestfs_h *g;
+ void *data;
+};
-/* Current main loop. */
-static guestfs_main_loop main_loop = {
+struct select_main_loop {
+ /* NB. These fields must be the same as in struct guestfs_main_loop: */
+ guestfs_add_handle_cb add_handle;
+ guestfs_remove_handle_cb remove_handle;
+ guestfs_add_timeout_cb add_timeout;
+ guestfs_remove_timeout_cb remove_timeout;
+ guestfs_main_loop_run_cb main_loop_run;
+ guestfs_main_loop_quit_cb main_loop_quit;
+
+ /* Additional private data: */
+ int is_running;
+
+ fd_set rset;
+ fd_set wset;
+ fd_set xset;
+
+ int max_fd;
+ int nr_fds;
+ struct select_handle_cb_data *handle_cb_data;
+};
+
+/* Default main loop. */
+static struct select_main_loop default_main_loop = {
.add_handle = select_add_handle,
.remove_handle = select_remove_handle,
.add_timeout = select_add_timeout,
.remove_timeout = select_remove_timeout,
.main_loop_run = select_main_loop_run,
.main_loop_quit = select_main_loop_quit,
+
+ /* XXX hopefully .rset, .wset, .xset are initialized to the empty
+ * set by the normal action of everything being initialized to zero.
+ */
+ .is_running = 0,
+ .max_fd = -1,
+ .nr_fds = 0,
+ .handle_cb_data = NULL,
};
+#define UNIX_PATH_MAX 108
+
+/* Also in guestfsd.c */
+#define VMCHANNEL_PORT 6666
+#define VMCHANNEL_ADDR "10.0.2.4"
+
/* GuestFS handle and connection. */
enum state { CONFIG, LAUNCHING, READY, BUSY, NO_HANDLE };
struct guestfs_h
{
+ struct guestfs_h *next; /* Linked list of open handles. */
+
/* State: see the state machine diagram in the man page guestfs(3). */
enum state state;
int fd[2]; /* Stdin/stdout of qemu. */
int sock; /* Daemon communications socket. */
- int pid; /* Qemu PID. */
+ pid_t pid; /* Qemu PID. */
+ pid_t recoverypid; /* Recovery process PID. */
time_t start_t; /* The time when we started qemu. */
int stdout_watch; /* Watches qemu stdout for log messages. */
char *tmpdir; /* Temporary directory containing socket. */
+ char *qemu_help, *qemu_version; /* Output of qemu -help, qemu -version. */
+
char **cmdline; /* Qemu command line. */
int cmdline_size;
int verbose;
+ int autosync;
+
+ char *path; /* Path to kernel, initrd. */
+ char *qemu; /* Qemu binary. */
+ char *append; /* Append to kernel command line. */
+
+ int memsize; /* Size of RAM (megabytes). */
+
+ char *last_error;
/* Callbacks. */
guestfs_abort_cb abort_cb;
guestfs_error_handler_cb error_cb;
void * error_cb_data;
+ guestfs_send_cb send_cb;
+ void * send_cb_data;
guestfs_reply_cb reply_cb;
void * reply_cb_data;
guestfs_log_message_cb log_message_cb;
guestfs_launch_done_cb launch_done_cb;
void * launch_done_cb_data;
- /* These callbacks are called before reply_cb and launch_done_cb,
- * and are used to implement the high-level API without needing to
- * interfere with callbacks that the user might have set.
- */
- guestfs_reply_cb reply_cb_internal;
- void * reply_cb_internal_data;
- guestfs_launch_done_cb launch_done_cb_internal;
- void * launch_done_cb_internal_data;
+ /* Main loop used by this handle. */
+ guestfs_main_loop *main_loop;
/* Messages sent and received from the daemon. */
char *msg_in;
int msg_next_serial;
};
+static guestfs_h *handles = NULL;
+static int atexit_handler_set = 0;
+
guestfs_h *
guestfs_create (void)
{
str = getenv ("LIBGUESTFS_DEBUG");
g->verbose = str != NULL && strcmp (str, "1") == 0;
+ str = getenv ("LIBGUESTFS_PATH");
+ g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
+ if (!g->path) goto error;
+
+ str = getenv ("LIBGUESTFS_QEMU");
+ g->qemu = str != NULL ? strdup (str) : strdup (QEMU);
+ if (!g->qemu) goto error;
+
+ str = getenv ("LIBGUESTFS_APPEND");
+ if (str) {
+ g->append = strdup (str);
+ if (!g->append) goto error;
+ }
+
+ /* Choose a suitable memory size. Previously we tried to choose
+ * a minimal memory size, but this isn't really necessary since
+ * recent QEMU and KVM don't do anything nasty like locking
+ * memory into core any more. Thus we can safely choose a
+ * large, generous amount of memory, and it'll just get swapped
+ * on smaller systems.
+ */
+ str = getenv ("LIBGUESTFS_MEMSIZE");
+ if (str) {
+ if (sscanf (str, "%d", &g->memsize) != 1 || g->memsize <= 256) {
+ fprintf (stderr, "libguestfs: non-numeric or too small value for LIBGUESTFS_MEMSIZE\n");
+ goto error;
+ }
+ } else
+ g->memsize = 500;
+
+ g->main_loop = guestfs_get_default_main_loop ();
+
/* Start with large serial numbers so they are easy to spot
* inside the protocol.
*/
g->msg_next_serial = 0x00123400;
+ /* Link the handles onto a global list. This is the one area
+ * where the library needs to be made thread-safe. (XXX)
+ */
+ /* acquire mutex (XXX) */
+ g->next = handles;
+ handles = g;
+ if (!atexit_handler_set) {
+ atexit (close_handles);
+ atexit_handler_set = 1;
+ }
+ /* release mutex (XXX) */
+
+ if (g->verbose)
+ fprintf (stderr, "new guestfs handle %p\n", g);
+
return g;
+
+ error:
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
+ free (g);
+ return NULL;
}
void
{
int i;
char filename[256];
+ guestfs_h *gg;
if (g->state == NO_HANDLE) {
/* Not safe to call 'error' here, so ... */
- fprintf (stderr, "guestfs_close: called twice on the same handle\n");
+ fprintf (stderr, _("guestfs_close: called twice on the same handle\n"));
return;
}
+ if (g->verbose)
+ fprintf (stderr, "closing guestfs handle %p (state %d)\n", g, g->state);
+
+ /* Try to sync if autosync flag is set. */
+ if (g->autosync && g->state == READY) {
+ guestfs_umount_all (g);
+ guestfs_sync (g);
+ }
+
/* Remove any handlers that might be called back before we kill the
* subprocess.
*/
if (g->state != CONFIG)
guestfs_kill_subprocess (g);
+ /* Close any sockets and deregister any handlers. */
+ if (g->stdout_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
+ if (g->sock_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+
+ if (g->fd[0] >= 0)
+ close (g->fd[0]);
+ if (g->fd[1] >= 0)
+ close (g->fd[1]);
+ if (g->sock >= 0)
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+
+ /* Remove tmpfiles. */
if (g->tmpdir) {
snprintf (filename, sizeof filename, "%s/sock", g->tmpdir);
unlink (filename);
+ snprintf (filename, sizeof filename, "%s/initrd", g->tmpdir);
+ unlink (filename);
+
+ snprintf (filename, sizeof filename, "%s/kernel", g->tmpdir);
+ unlink (filename);
+
rmdir (g->tmpdir);
free (g->tmpdir);
/* Mark the handle as dead before freeing it. */
g->state = NO_HANDLE;
+ /* acquire mutex (XXX) */
+ if (handles == g)
+ handles = g->next;
+ else {
+ for (gg = handles; gg->next != g; gg = gg->next)
+ ;
+ gg->next = g->next;
+ }
+ /* release mutex (XXX) */
+
+ free (g->msg_in);
+ free (g->msg_out);
+ free (g->last_error);
+ free (g->path);
+ free (g->qemu);
+ free (g->append);
+ free (g->qemu_help);
+ free (g->qemu_version);
free (g);
}
+/* Close all open handles (called from atexit(3)). */
static void
-default_error_cb (guestfs_h *g, void *data, const char *msg)
+close_handles (void)
+{
+ while (handles) guestfs_close (handles);
+}
+
+const char *
+guestfs_last_error (guestfs_h *g)
+{
+ return g->last_error;
+}
+
+static void
+set_last_error (guestfs_h *g, const char *msg)
{
- fprintf (stderr, "libguestfs: error: %s\n", msg);
+ free (g->last_error);
+ g->last_error = strdup (msg);
}
static void
-error (guestfs_h *g, const char *fs, ...)
+default_error_cb (guestfs_h *g, void *data, const char *msg)
+{
+ fprintf (stderr, _("libguestfs: error: %s\n"), msg);
+}
+
+void
+guestfs_error (guestfs_h *g, const char *fs, ...)
{
va_list args;
char *msg;
- if (!g->error_cb) return;
-
va_start (args, fs);
- vasprintf (&msg, fs, args);
+ int err = vasprintf (&msg, fs, args);
va_end (args);
- g->error_cb (g, g->error_cb_data, msg);
+ if (err < 0) return;
+
+ if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+ set_last_error (g, msg);
free (msg);
}
-static void
-perrorf (guestfs_h *g, const char *fs, ...)
+void
+guestfs_perrorf (guestfs_h *g, const char *fs, ...)
{
va_list args;
char *msg;
int err = errno;
- if (!g->error_cb) return;
-
va_start (args, fs);
- vasprintf (&msg, fs, args);
+ int err = vasprintf (&msg, fs, args);
va_end (args);
+ if (err < 0) return;
+
#ifndef _GNU_SOURCE
char buf[256];
strerror_r (err, buf, sizeof buf);
strcat (msg, ": ");
strcat (msg, buf);
- g->error_cb (g, g->error_cb_data, msg);
+ if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
+ set_last_error (g, msg);
free (msg);
}
-static void *
-safe_malloc (guestfs_h *g, int nbytes)
+void *
+guestfs_safe_malloc (guestfs_h *g, size_t nbytes)
{
void *ptr = malloc (nbytes);
- if (!ptr) g->abort_cb ();
+ if (nbytes > 0 && !ptr) g->abort_cb ();
return ptr;
}
-static void *
-safe_realloc (guestfs_h *g, void *ptr, int nbytes)
+/* Return 1 if an array of N objects, each of size S, cannot exist due
+ to size arithmetic overflow. S must be positive and N must be
+ nonnegative. This is a macro, not an inline function, so that it
+ works correctly even when SIZE_MAX < N.
+
+ By gnulib convention, SIZE_MAX represents overflow in size
+ calculations, so the conservative dividend to use here is
+ SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
+ However, malloc (SIZE_MAX) fails on all known hosts where
+ sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
+ exactly-SIZE_MAX allocations on such hosts; this avoids a test and
+ branch when S is known to be 1. */
+# define xalloc_oversized(n, s) \
+ ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
+
+/* Technically we should add an autoconf test for this, testing for the desired
+ functionality, like what's done in gnulib, but for now, this is fine. */
+#define HAVE_GNU_CALLOC (__GLIBC__ >= 2)
+
+/* Allocate zeroed memory for N elements of S bytes, with error
+ checking. S must be nonzero. */
+void *
+guestfs_safe_calloc (guestfs_h *g, size_t n, size_t s)
+{
+ /* From gnulib's calloc function in xmalloc.c. */
+ void *p;
+ /* Test for overflow, since some calloc implementations don't have
+ proper overflow checks. But omit overflow and size-zero tests if
+ HAVE_GNU_CALLOC, since GNU calloc catches overflow and never
+ returns NULL if successful. */
+ if ((! HAVE_GNU_CALLOC && xalloc_oversized (n, s))
+ || (! (p = calloc (n, s)) && (HAVE_GNU_CALLOC || n != 0)))
+ g->abort_cb ();
+ return p;
+}
+
+void *
+guestfs_safe_realloc (guestfs_h *g, void *ptr, int nbytes)
{
void *p = realloc (ptr, nbytes);
- if (!p) g->abort_cb ();
+ if (nbytes > 0 && !p) g->abort_cb ();
return p;
}
-static char *
-safe_strdup (guestfs_h *g, const char *str)
+char *
+guestfs_safe_strdup (guestfs_h *g, const char *str)
{
char *s = strdup (str);
if (!s) g->abort_cb ();
return s;
}
+void *
+guestfs_safe_memdup (guestfs_h *g, void *ptr, size_t size)
+{
+ void *p = malloc (size);
+ if (!p) g->abort_cb ();
+ memcpy (p, ptr, size);
+ return p;
+}
+
+static int
+xwrite (int fd, const void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = write (fd, buf, len);
+ if (r == -1)
+ return -1;
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
+static int
+xread (int fd, void *buf, size_t len)
+{
+ int r;
+
+ while (len > 0) {
+ r = read (fd, buf, len);
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
+ return -1;
+ }
+
+ buf += r;
+ len -= r;
+ }
+
+ return 0;
+}
+
void
guestfs_set_out_of_memory_handler (guestfs_h *g, guestfs_abort_cb cb)
{
return g->error_cb;
}
-void
+int
guestfs_set_verbose (guestfs_h *g, int v)
{
- g->verbose = v;
+ g->verbose = !!v;
+ return 0;
}
int
return g->verbose;
}
+int
+guestfs_set_autosync (guestfs_h *g, int a)
+{
+ g->autosync = !!a;
+ return 0;
+}
+
+int
+guestfs_get_autosync (guestfs_h *g)
+{
+ return g->autosync;
+}
+
+int
+guestfs_set_path (guestfs_h *g, const char *path)
+{
+ free (g->path);
+ g->path = NULL;
+
+ g->path =
+ path == NULL ?
+ safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
+ return 0;
+}
+
+const char *
+guestfs_get_path (guestfs_h *g)
+{
+ return g->path;
+}
+
+int
+guestfs_set_qemu (guestfs_h *g, const char *qemu)
+{
+ free (g->qemu);
+ g->qemu = NULL;
+
+ g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
+ return 0;
+}
+
+const char *
+guestfs_get_qemu (guestfs_h *g)
+{
+ return g->qemu;
+}
+
+int
+guestfs_set_append (guestfs_h *g, const char *append)
+{
+ free (g->append);
+ g->append = NULL;
+
+ g->append = append ? safe_strdup (g, append) : NULL;
+ return 0;
+}
+
+const char *
+guestfs_get_append (guestfs_h *g)
+{
+ return g->append;
+}
+
+int
+guestfs_set_memsize (guestfs_h *g, int memsize)
+{
+ g->memsize = memsize;
+ return 0;
+}
+
+int
+guestfs_get_memsize (guestfs_h *g)
+{
+ return g->memsize;
+}
+
+int
+guestfs_get_pid (guestfs_h *g)
+{
+ if (g->pid > 0)
+ return g->pid;
+ else {
+ error (g, "get_pid: no qemu subprocess");
+ return -1;
+ }
+}
+
+struct guestfs_version *
+guestfs_version (guestfs_h *g)
+{
+ struct guestfs_version *r;
+
+ r = safe_malloc (g, sizeof *r);
+ r->major = PACKAGE_VERSION_MAJOR;
+ r->minor = PACKAGE_VERSION_MINOR;
+ r->release = PACKAGE_VERSION_RELEASE;
+ r->extra = safe_strdup (g, PACKAGE_VERSION_EXTRA);
+ return r;
+}
+
/* Add a string to the current command line. */
static void
incr_cmdline_size (guestfs_h *g)
add_cmdline (guestfs_h *g, const char *str)
{
if (g->state != CONFIG) {
- error (g, "command line cannot be altered after qemu subprocess launched");
+ error (g,
+ _("command line cannot be altered after qemu subprocess launched"));
return -1;
}
const char *qemu_param, const char *qemu_value)
{
if (qemu_param[0] != '-') {
- error (g, "guestfs_config: parameter must begin with '-' character");
+ error (g, _("guestfs_config: parameter must begin with '-' character"));
return -1;
}
strcmp (qemu_param, "-initrd") == 0 ||
strcmp (qemu_param, "-nographic") == 0 ||
strcmp (qemu_param, "-serial") == 0 ||
- strcmp (qemu_param, "-vnc") == 0 ||
strcmp (qemu_param, "-full-screen") == 0 ||
strcmp (qemu_param, "-std-vga") == 0 ||
strcmp (qemu_param, "-vnc") == 0) {
- error (g, "guestfs_config: parameter '%s' isn't allowed", qemu_param);
+ error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
return -1;
}
int
guestfs_add_drive (guestfs_h *g, const char *filename)
{
- int len = strlen (filename) + 64;
+ size_t len = strlen (filename) + 64;
+ char buf[len];
+
+ if (strchr (filename, ',') != NULL) {
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ /* cache=off improves reliability in the event of a host crash. */
+ snprintf (buf, len, "file=%s,cache=off,if=%s", filename, DRIVE_IF);
+
+ return guestfs_config (g, "-drive", buf);
+}
+
+int
+guestfs_add_drive_ro (guestfs_h *g, const char *filename)
+{
+ size_t len = strlen (filename) + 64;
char buf[len];
if (strchr (filename, ',') != NULL) {
- error (g, "filename cannot contain ',' (comma) character");
+ error (g, _("filename cannot contain ',' (comma) character"));
return -1;
}
- snprintf (buf, len, "file=%s", filename);
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
+ return -1;
+ }
+
+ snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, DRIVE_IF);
return guestfs_config (g, "-drive", buf);
}
guestfs_add_cdrom (guestfs_h *g, const char *filename)
{
if (strchr (filename, ',') != NULL) {
- error (g, "filename cannot contain ',' (comma) character");
+ error (g, _("filename cannot contain ',' (comma) character"));
+ return -1;
+ }
+
+ if (access (filename, F_OK) == -1) {
+ perrorf (g, "%s", filename);
return -1;
}
return guestfs_config (g, "-cdrom", filename);
}
+/* Returns true iff file is contained in dir. */
+static int
+dir_contains_file (const char *dir, const char *file)
+{
+ int dirlen = strlen (dir);
+ int filelen = strlen (file);
+ int len = dirlen+filelen+2;
+ char path[len];
+
+ snprintf (path, len, "%s/%s", dir, file);
+ return access (path, F_OK) == 0;
+}
+
+/* Returns true iff every listed file is contained in 'dir'. */
+static int
+dir_contains_files (const char *dir, ...)
+{
+ va_list args;
+ const char *file;
+
+ va_start (args, dir);
+ while ((file = va_arg (args, const char *)) != NULL) {
+ if (!dir_contains_file (dir, file)) {
+ va_end (args);
+ return 0;
+ }
+ }
+ va_end (args);
+ return 1;
+}
+
+static int build_supermin_appliance (guestfs_h *g, const char *path, char **kernel, char **initrd);
+static int test_qemu (guestfs_h *g);
+static int qemu_supports (guestfs_h *g, const char *option);
+
+static const char *kernel_name = "vmlinuz." REPO "." host_cpu;
+static const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
+static const char *supermin_name =
+ "initramfs." REPO "." host_cpu ".supermin.img";
+static const char *supermin_hostfiles_name =
+ "initramfs." REPO "." host_cpu ".supermin.hostfiles";
+
int
guestfs_launch (guestfs_h *g)
{
- static const char *dir_template = "/tmp/libguestfsXXXXXX";
- int r, i;
+ const char *tmpdir;
+ char dir_template[PATH_MAX];
+ int r, i, pmore;
+ size_t len;
int wfd[2], rfd[2];
int tries;
- /*const char *qemu = QEMU;*/ /* XXX */
- const char *qemu = "/usr/bin/qemu-system-x86_64";
- const char *kernel = "vmlinuz.fedora-10.x86_64";
- const char *initrd = "initramfs.fedora-10.x86_64.img";
+ char *path, *pelem, *pend;
+ char *kernel = NULL, *initrd = NULL;
char unixsock[256];
struct sockaddr_un addr;
- /* XXX Choose which qemu to run. */
- /* XXX Choose initrd, etc. */
+#ifdef P_tmpdir
+ tmpdir = P_tmpdir;
+#else
+ tmpdir = "/tmp";
+#endif
+
+ tmpdir = getenv ("TMPDIR") ? : tmpdir;
+ snprintf (dir_template, sizeof dir_template, "%s/libguestfsXXXXXX", tmpdir);
/* Configured? */
if (!g->cmdline) {
- error (g, "you must call guestfs_add_drive before guestfs_launch");
+ error (g, _("you must call guestfs_add_drive before guestfs_launch"));
return -1;
}
if (g->state != CONFIG) {
- error (g, "qemu has already been launched");
+ error (g, _("qemu has already been launched"));
return -1;
}
- /* Make the temporary directory containing the socket. */
+ /* Make the temporary directory. */
if (!g->tmpdir) {
g->tmpdir = safe_strdup (g, dir_template);
if (mkdtemp (g->tmpdir) == NULL) {
- perrorf (g, "%s: cannot create temporary directory", dir_template);
- return -1;
+ perrorf (g, _("%s: cannot create temporary directory"), dir_template);
+ goto cleanup0;
+ }
+ }
+
+ /* First search g->path for the supermin appliance, and try to
+ * synthesize a kernel and initrd from that. If it fails, we
+ * try the path search again looking for a backup ordinary
+ * appliance.
+ */
+ pelem = path = safe_strdup (g, g->path);
+ do {
+ pend = strchrnul (pelem, ':');
+ pmore = *pend == ':';
+ *pend = '\0';
+ len = pend - pelem;
+
+ /* Empty element of "." means cwd. */
+ if (len == 0 || (len == 1 && *pelem == '.')) {
+ if (g->verbose)
+ fprintf (stderr,
+ "looking for supermin appliance in current directory\n");
+ if (dir_contains_files (".",
+ supermin_name, supermin_hostfiles_name,
+ "kmod.whitelist", NULL)) {
+ if (build_supermin_appliance (g, ".", &kernel, &initrd) == -1)
+ return -1;
+ break;
+ }
+ }
+ /* Look at <path>/supermin* etc. */
+ else {
+ if (g->verbose)
+ fprintf (stderr, "looking for supermin appliance in %s\n", pelem);
+
+ if (dir_contains_files (pelem,
+ supermin_name, supermin_hostfiles_name,
+ "kmod.whitelist", NULL)) {
+ if (build_supermin_appliance (g, pelem, &kernel, &initrd) == -1)
+ return -1;
+ break;
+ }
}
+
+ pelem = pend + 1;
+ } while (pmore);
+
+ free (path);
+
+ if (kernel == NULL || initrd == NULL) {
+ /* Search g->path for the kernel and initrd. */
+ pelem = path = safe_strdup (g, g->path);
+ do {
+ pend = strchrnul (pelem, ':');
+ pmore = *pend == ':';
+ *pend = '\0';
+ len = pend - pelem;
+
+ /* Empty element or "." means cwd. */
+ if (len == 0 || (len == 1 && *pelem == '.')) {
+ if (g->verbose)
+ fprintf (stderr,
+ "looking for appliance in current directory\n");
+ if (dir_contains_files (".", kernel_name, initrd_name, NULL)) {
+ kernel = safe_strdup (g, kernel_name);
+ initrd = safe_strdup (g, initrd_name);
+ break;
+ }
+ }
+ /* Look at <path>/kernel etc. */
+ else {
+ if (g->verbose)
+ fprintf (stderr, "looking for appliance in %s\n", pelem);
+
+ if (dir_contains_files (pelem, kernel_name, initrd_name, NULL)) {
+ kernel = safe_malloc (g, len + strlen (kernel_name) + 2);
+ initrd = safe_malloc (g, len + strlen (initrd_name) + 2);
+ sprintf (kernel, "%s/%s", pelem, kernel_name);
+ sprintf (initrd, "%s/%s", pelem, initrd_name);
+ break;
+ }
+ }
+
+ pelem = pend + 1;
+ } while (pmore);
+
+ free (path);
+ }
+
+ if (kernel == NULL || initrd == NULL) {
+ error (g, _("cannot find %s or %s on LIBGUESTFS_PATH (current path = %s)"),
+ kernel_name, initrd_name, g->path);
+ goto cleanup0;
}
+ /* Get qemu help text and version. */
+ if (test_qemu (g) == -1)
+ goto cleanup0;
+
+ /* Make the vmchannel socket. */
snprintf (unixsock, sizeof unixsock, "%s/sock", g->tmpdir);
unlink (unixsock);
if (pipe (wfd) == -1 || pipe (rfd) == -1) {
perrorf (g, "pipe");
- return -1;
+ goto cleanup0;
}
r = fork ();
close (wfd[1]);
close (rfd[0]);
close (rfd[1]);
- return -1;
+ goto cleanup0;
}
if (r == 0) { /* Child (qemu). */
char vmchannel[256];
char append[256];
+ char memsize_str[256];
/* Set up the full command line. Do this in the subprocess so we
* don't need to worry about cleaning up.
*/
- g->cmdline[0] = (char *) qemu;
+ g->cmdline[0] = g->qemu;
- /* Construct the -net channel parameter for qemu. */
- snprintf (vmchannel, sizeof vmchannel,
- "channel,%d:unix:%s,server,nowait",
- VMCHANNEL_PORT, unixsock);
+#define LINUX_CMDLINE \
+ "panic=1 " /* force kernel to panic if daemon exits */ \
+ "console=ttyS0 " /* serial console */ \
+ "udevtimeout=300 " /* good for very slow systems (RHBZ#480319) */ \
+ "noapic " /* workaround for RHBZ#502058 - ok if not SMP */ \
+ "acpi=off " /* we don't need ACPI, turn it off */ \
+ "cgroup_disable=memory " /* saves us about 5 MB of RAM */ \
+ "selinux=0 " /* SELinux is messed up if there's no policy */
/* Linux kernel command line. */
snprintf (append, sizeof append,
- "console=ttyS0 guestfs=%s:%d", VMCHANNEL_ADDR, VMCHANNEL_PORT);
+ LINUX_CMDLINE "guestfs=%s:%d%s%s%s",
+ VMCHANNEL_ADDR, VMCHANNEL_PORT,
+ g->verbose ? " guestfs_verbose=1" : "",
+ g->append ? " " : "", g->append ? g->append : "");
+
+ snprintf (memsize_str, sizeof memsize_str, "%d", g->memsize);
add_cmdline (g, "-m");
- add_cmdline (g, "384"); /* XXX Choose best size. */
+ add_cmdline (g, memsize_str);
+ add_cmdline (g, "-no-reboot"); /* Force exit instead of reboot on panic */
add_cmdline (g, "-kernel");
add_cmdline (g, (char *) kernel);
add_cmdline (g, "-initrd");
add_cmdline (g, "-nographic");
add_cmdline (g, "-serial");
add_cmdline (g, "stdio");
+
+#if 0
+ /* Doesn't work. See:
+ * http://lists.gnu.org/archive/html/qemu-devel/2009-07/threads.html
+ * Subject "guestfwd option doesn't allow supplementary ,server,nowait"
+ */
+ if (qemu_supports (g, "guestfwd")) {
+ /* New-style -net user,guestfwd=... syntax for vmchannel. See:
+ * http://git.savannah.gnu.org/cgit/qemu.git/commit/?id=c92ef6a22d3c71538fcc48fb61ad353f7ba03b62
+ */
+ snprintf (vmchannel, sizeof vmchannel,
+ "user,vlan=0,guestfwd=tcp:%s:%d-unix:%s,server,nowait",
+ VMCHANNEL_ADDR, VMCHANNEL_PORT, unixsock);
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, vmchannel);
+ } else {
+#endif
+ /* Not guestfwd. HOPEFULLY this qemu uses the older -net channel
+ * syntax, or if not then we'll get a quick failure.
+ */
+ snprintf (vmchannel, sizeof vmchannel,
+ "channel,%d:unix:%s,server,nowait",
+ VMCHANNEL_PORT, unixsock);
+
+ add_cmdline (g, "-net");
+ add_cmdline (g, vmchannel);
+ add_cmdline (g, "-net");
+ add_cmdline (g, "user,vlan=0");
+#if 0
+ }
+#endif
add_cmdline (g, "-net");
- add_cmdline (g, vmchannel);
- add_cmdline (g, "-net");
- add_cmdline (g, "user,vlan=0");
- add_cmdline (g, "-net");
- add_cmdline (g, "nic,vlan=0");
+ add_cmdline (g, "nic,model=virtio,vlan=0");
+
+ /* These options recommended by KVM developers to improve reliability. */
+ if (qemu_supports (g, "-no-hpet"))
+ add_cmdline (g, "-no-hpet");
+
+ if (qemu_supports (g, "-rtc-td-hack"))
+ add_cmdline (g, "-rtc-td-hack");
+
+ /* Finish off the command line. */
incr_cmdline_size (g);
g->cmdline[g->cmdline_size-1] = NULL;
if (g->verbose) {
- fprintf (stderr, "%s", qemu);
+ fprintf (stderr, "%s", g->qemu);
for (i = 0; g->cmdline[i]; ++i)
fprintf (stderr, " %s", g->cmdline[i]);
fprintf (stderr, "\n");
close (rfd[0]);
dup (wfd[0]);
dup (rfd[1]);
+ close (wfd[0]);
+ close (rfd[1]);
#if 0
/* Set up a new process group, so we can signal this process
setpgid (0, 0);
#endif
- execv (qemu, g->cmdline); /* Run qemu. */
- perror (qemu);
+ execv (g->qemu, g->cmdline); /* Run qemu. */
+ perror (g->qemu);
_exit (1);
}
/* Parent (library). */
g->pid = r;
- /* Start the clock ... */
- time (&g->start_t);
+ free (kernel);
+ kernel = NULL;
+ free (initrd);
+ initrd = NULL;
- /* Close the other ends of the pipe. */
- close (wfd[0]);
- close (rfd[1]);
+ /* Fork the recovery process off which will kill qemu if the parent
+ * process fails to do so (eg. if the parent segfaults).
+ */
+ r = fork ();
+ if (r == 0) {
+ pid_t qemu_pid = g->pid;
+ pid_t parent_pid = getppid ();
+
+ /* Writing to argv is hideously complicated and error prone. See:
+ * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+ */
+
+ /* Loop around waiting for one or both of the other processes to
+ * disappear. It's fair to say this is very hairy. The PIDs that
+ * we are looking at might be reused by another process. We are
+ * effectively polling. Is the cure worse than the disease?
+ */
+ for (;;) {
+ if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
+ _exit (0);
+ if (kill (parent_pid, 0) == -1) {
+ /* Parent's gone away, qemu still around, so kill qemu. */
+ kill (qemu_pid, 9);
+ _exit (0);
+ }
+ sleep (2);
+ }
+ }
+
+ /* Don't worry, if the fork failed, this will be -1. The recovery
+ * process isn't essential.
+ */
+ g->recoverypid = r;
+
+ /* Start the clock ... */
+ time (&g->start_t);
+
+ /* Close the other ends of the pipe. */
+ close (wfd[0]);
+ close (rfd[1]);
if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
addr.sun_path[UNIX_PATH_MAX-1] = '\0';
tries = 100;
+ /* Always sleep at least once to give qemu a small chance to start up. */
+ usleep (10000);
while (tries > 0) {
- /* Always sleep at least once to give qemu a small chance to start up. */
- usleep (10000);
-
r = connect (g->sock, (struct sockaddr *) &addr, sizeof addr);
if ((r == -1 && errno == EINPROGRESS) || r == 0)
goto connected;
if (errno != ENOENT)
perrorf (g, "connect");
tries--;
+ usleep (100000);
}
- error (g, "failed to connect to vmchannel socket");
+ error (g, _("failed to connect to vmchannel socket"));
goto cleanup2;
connected:
g->msg_out_pos = 0;
g->stdout_watch =
- main_loop.add_handle (g, g->fd[1],
- GUESTFS_HANDLE_READABLE,
- stdout_event, g);
+ g->main_loop->add_handle (g->main_loop, g, g->fd[1],
+ GUESTFS_HANDLE_READABLE,
+ stdout_event, NULL);
if (g->stdout_watch == -1) {
- error (g, "could not watch qemu stdout");
+ error (g, _("could not watch qemu stdout"));
goto cleanup3;
}
- g->sock_watch =
- main_loop.add_handle (g, g->sock,
- GUESTFS_HANDLE_READABLE,
- sock_read_event, g);
- if (g->sock_watch == -1) {
- error (g, "could not watch daemon communications socket");
+ if (guestfs__switch_to_receiving (g) == -1)
goto cleanup3;
- }
g->state = LAUNCHING;
return 0;
cleanup3:
if (g->stdout_watch >= 0)
- main_loop.remove_handle (g, g->stdout_watch);
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
if (g->sock_watch >= 0)
- main_loop.remove_handle (g, g->sock_watch);
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
cleanup2:
close (g->sock);
close (wfd[1]);
close (rfd[0]);
kill (g->pid, 9);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
g->fd[0] = -1;
g->fd[1] = -1;
g->sock = -1;
g->pid = 0;
+ g->recoverypid = 0;
g->start_t = 0;
g->stdout_watch = -1;
g->sock_watch = -1;
+
+ cleanup0:
+ free (kernel);
+ free (initrd);
return -1;
}
+/* This function does the hard work of building the supermin appliance
+ * on the fly. 'path' is the directory containing the control files.
+ * 'kernel' and 'initrd' are where we will return the names of the
+ * kernel and initrd (only initrd is built). The work is done by
+ * an external script. We just tell it where to put the result.
+ */
+static int
+build_supermin_appliance (guestfs_h *g, const char *path,
+ char **kernel, char **initrd)
+{
+ char cmd[4096];
+ int r, len;
+
+ len = strlen (g->tmpdir);
+ *kernel = safe_malloc (g, len + 8);
+ snprintf (*kernel, len+8, "%s/kernel", g->tmpdir);
+ *initrd = safe_malloc (g, len + 8);
+ snprintf (*initrd, len+8, "%s/initrd", g->tmpdir);
+
+ snprintf (cmd, sizeof cmd,
+ "PATH='%s':$PATH "
+ "libguestfs-supermin-helper '%s' %s %s",
+ path,
+ path, *kernel, *initrd);
+
+ r = system (cmd);
+ if (r == -1 || WEXITSTATUS(r) != 0) {
+ error (g, _("external command failed: %s"), cmd);
+ free (*kernel);
+ free (*initrd);
+ *kernel = *initrd = NULL;
+ return -1;
+ }
+
+ return 0;
+}
+
+static int read_all (guestfs_h *g, FILE *fp, char **ret);
+
+/* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
+ * 'qemu -version' so we know what options this qemu supports and
+ * the version.
+ */
+static int
+test_qemu (guestfs_h *g)
+{
+ char cmd[1024];
+ FILE *fp;
+
+ free (g->qemu_help);
+ free (g->qemu_version);
+ g->qemu_help = NULL;
+ g->qemu_version = NULL;
+
+ snprintf (cmd, sizeof cmd, "'%s' -help", g->qemu);
+
+ fp = popen (cmd, "r");
+ /* qemu -help should always work (qemu -version OTOH wasn't
+ * supported by qemu 0.9). If this command doesn't work then it
+ * probably indicates that the qemu binary is missing.
+ */
+ if (!fp) {
+ /* XXX This error is never printed, even if the qemu binary
+ * doesn't exist. Why?
+ */
+ error:
+ perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
+ return -1;
+ }
+
+ if (read_all (g, fp, &g->qemu_help) == -1)
+ goto error;
+
+ if (pclose (fp) == -1)
+ goto error;
+
+ snprintf (cmd, sizeof cmd, "'%s' -version 2>/dev/null", g->qemu);
+
+ fp = popen (cmd, "r");
+ if (fp) {
+ /* Intentionally ignore errors. */
+ read_all (g, fp, &g->qemu_version);
+ pclose (fp);
+ }
+
+ return 0;
+}
+
+static int
+read_all (guestfs_h *g, FILE *fp, char **ret)
+{
+ int r, n = 0;
+ char *p;
+
+ again:
+ if (feof (fp)) {
+ *ret = safe_realloc (g, *ret, n + 1);
+ (*ret)[n] = '\0';
+ return n;
+ }
+
+ *ret = safe_realloc (g, *ret, n + BUFSIZ);
+ p = &(*ret)[n];
+ r = fread (p, 1, BUFSIZ, fp);
+ if (ferror (fp)) {
+ perrorf (g, "read");
+ return -1;
+ }
+ n += r;
+ goto again;
+}
+
+/* Test if option is supported by qemu command line (just by grepping
+ * the help text).
+ */
+static int
+qemu_supports (guestfs_h *g, const char *option)
+{
+ return g->qemu_help && strstr (g->qemu_help, option) != NULL;
+}
+
static void
finish_wait_ready (guestfs_h *g, void *vp)
{
+ if (g->verbose)
+ fprintf (stderr, "finish_wait_ready called, %p, vp = %p\n", g, vp);
+
*((int *)vp) = 1;
- main_loop.main_loop_quit (g);
+ g->main_loop->main_loop_quit (g->main_loop, g);
}
int
guestfs_wait_ready (guestfs_h *g)
{
- int r = 0;
+ int finished = 0, r;
if (g->state == READY) return 0;
if (g->state == BUSY) {
- error (g, "qemu has finished launching already");
+ error (g, _("qemu has finished launching already"));
return -1;
}
if (g->state != LAUNCHING) {
- error (g, "qemu has not been launched yet");
+ error (g, _("qemu has not been launched yet"));
return -1;
}
- g->launch_done_cb_internal = finish_wait_ready;
- g->launch_done_cb_internal_data = &r;
- main_loop.main_loop_run (g);
- g->launch_done_cb_internal = NULL;
- g->launch_done_cb_internal_data = NULL;
+ g->launch_done_cb = finish_wait_ready;
+ g->launch_done_cb_data = &finished;
+ r = g->main_loop->main_loop_run (g->main_loop, g);
+ g->launch_done_cb = NULL;
+ g->launch_done_cb_data = NULL;
- if (r != 1) {
- error (g, "guestfs_wait_ready failed, see earlier error messages");
+ if (r == -1) return -1;
+
+ if (finished != 1) {
+ error (g, _("guestfs_wait_ready failed, see earlier error messages"));
return -1;
}
* commands after this function returns.
*/
if (g->state != READY) {
- error (g, "qemu launched and contacted daemon, but state != READY");
+ error (g, _("qemu launched and contacted daemon, but state != READY"));
return -1;
}
guestfs_kill_subprocess (guestfs_h *g)
{
if (g->state == CONFIG) {
- error (g, "no subprocess to kill");
+ error (g, _("no subprocess to kill"));
return -1;
}
if (g->verbose)
- fprintf (stderr, "sending SIGTERM to process group %d\n", g->pid);
+ fprintf (stderr, "sending SIGTERM to process %d\n", g->pid);
kill (g->pid, SIGTERM);
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+
+ return 0;
+}
+/* Access current state. */
+int
+guestfs_is_config (guestfs_h *g)
+{
+ return g->state == CONFIG;
+}
+
+int
+guestfs_is_launching (guestfs_h *g)
+{
+ return g->state == LAUNCHING;
+}
+
+int
+guestfs_is_ready (guestfs_h *g)
+{
+ return g->state == READY;
+}
+
+int
+guestfs_is_busy (guestfs_h *g)
+{
+ return g->state == BUSY;
+}
+
+int
+guestfs_get_state (guestfs_h *g)
+{
+ return g->state;
+}
+
+int
+guestfs_set_ready (guestfs_h *g)
+{
+ if (g->state != BUSY) {
+ error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
+ g->state);
+ return -1;
+ }
+ g->state = READY;
+ return 0;
+}
+
+int
+guestfs_set_busy (guestfs_h *g)
+{
+ if (g->state != READY) {
+ error (g, _("guestfs_set_busy: called when in state %d != READY"),
+ g->state);
+ return -1;
+ }
+ g->state = BUSY;
return 0;
}
+int
+guestfs_end_busy (guestfs_h *g)
+{
+ switch (g->state)
+ {
+ case BUSY:
+ g->state = READY;
+ break;
+ case CONFIG:
+ case READY:
+ break;
+ case LAUNCHING:
+ case NO_HANDLE:
+ error (g, _("guestfs_end_busy: called when in state %d"), g->state);
+ return -1;
+ }
+ return 0;
+}
+
+/* We don't know if stdout_event or sock_read_event will be the
+ * first to receive EOF if the qemu process dies. This function
+ * has the common cleanup code for both.
+ */
+static void
+child_cleanup (guestfs_h *g)
+{
+ if (g->verbose)
+ fprintf (stderr, "stdout_event: %p: child process died\n", g);
+ /*kill (g->pid, SIGTERM);*/
+ if (g->recoverypid > 0) kill (g->recoverypid, 9);
+ waitpid (g->pid, NULL, 0);
+ if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
+ if (g->stdout_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->stdout_watch);
+ if (g->sock_watch >= 0)
+ g->main_loop->remove_handle (g->main_loop, g, g->sock_watch);
+ close (g->fd[0]);
+ close (g->fd[1]);
+ close (g->sock);
+ g->fd[0] = -1;
+ g->fd[1] = -1;
+ g->sock = -1;
+ g->pid = 0;
+ g->recoverypid = 0;
+ g->start_t = 0;
+ g->stdout_watch = -1;
+ g->sock_watch = -1;
+ g->state = CONFIG;
+ if (g->subprocess_quit_cb)
+ g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+}
+
/* This function is called whenever qemu prints something on stdout.
* Qemu's stdout is also connected to the guest's serial console, so
* we see kernel messages here too.
*/
static void
-stdout_event (void *data, int watch, int fd, int events)
+stdout_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
{
- guestfs_h *g = (guestfs_h *) data;
char buf[4096];
int n;
#endif
if (g->fd[1] != fd) {
- error (g, "stdout_event: internal error: %d != %d", g->fd[1], fd);
+ error (g, _("stdout_event: internal error: %d != %d"), g->fd[1], fd);
return;
}
n = read (fd, buf, sizeof buf);
if (n == 0) {
/* Hopefully this indicates the qemu child process has died. */
- if (g->verbose)
- fprintf (stderr, "stdout_event: %p: child process died\n", g);
- /*kill (g->pid, SIGTERM);*/
- waitpid (g->pid, NULL, 0);
- if (g->stdout_watch >= 0)
- main_loop.remove_handle (g, g->stdout_watch);
- if (g->sock_watch >= 0)
- main_loop.remove_handle (g, g->sock_watch);
- close (g->fd[0]);
- close (g->fd[1]);
- close (g->sock);
- g->fd[0] = -1;
- g->fd[1] = -1;
- g->sock = -1;
- g->pid = 0;
- g->start_t = 0;
- g->stdout_watch = -1;
- g->sock_watch = -1;
- g->state = CONFIG;
- if (g->subprocess_quit_cb)
- g->subprocess_quit_cb (g, g->subprocess_quit_cb_data);
+ child_cleanup (g);
return;
}
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
* guestfsd (daemon inside the guest) communication socket.
*/
static void
-sock_read_event (void *data, int watch, int fd, int events)
+sock_read_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
{
- guestfs_h *g = (guestfs_h *) data;
XDR xdr;
- unsigned len;
+ u_int32_t len;
int n;
if (g->verbose)
g, g->state, fd, events);
if (g->sock != fd) {
- error (g, "sock_read_event: internal error: %d != %d", g->sock, fd);
+ error (g, _("sock_read_event: internal error: %d != %d"), g->sock, fd);
return;
}
}
n = read (g->sock, g->msg_in + g->msg_in_size,
g->msg_in_allocated - g->msg_in_size);
- if (n == 0)
- /* Disconnected? Ignore it because stdout_watch will get called
- * and will do the cleanup.
- */
+ if (n == 0) {
+ /* Disconnected. */
+ child_cleanup (g);
return;
+ }
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
g->msg_in_size += n;
/* Have we got enough of a message to be able to process it yet? */
+ again:
if (g->msg_in_size < 4) return;
xdrmem_create (&xdr, g->msg_in, g->msg_in_size, XDR_DECODE);
if (!xdr_uint32_t (&xdr, &len)) {
- error (g, "can't decode length word");
+ error (g, _("can't decode length word"));
goto cleanup;
}
* starts up it sends a "magic" value (longer than any possible
* message). Check for this.
*/
- if (len == 0xf5f55ff5) {
+ if (len == GUESTFS_LAUNCH_FLAG) {
if (g->state != LAUNCHING)
- error (g, "received magic signature from guestfsd, but in state %d",
+ error (g, _("received magic signature from guestfsd, but in state %d"),
g->state);
else if (g->msg_in_size != 4)
- error (g, "received magic signature from guestfsd, but msg size is %d",
+ error (g, _("received magic signature from guestfsd, but msg size is %d"),
g->msg_in_size);
else {
g->state = READY;
- if (g->launch_done_cb_internal)
- g->launch_done_cb_internal (g, g->launch_done_cb_internal_data);
if (g->launch_done_cb)
g->launch_done_cb (g, g->launch_done_cb_data);
}
goto cleanup;
}
- /* If this happens, it's pretty bad and we've probably lost synchronization.*/
+ /* This can happen if a cancellation happens right at the end
+ * of us sending a FileIn parameter to the daemon. Discard. The
+ * daemon should send us an error message next.
+ */
+ if (len == GUESTFS_CANCEL_FLAG) {
+ g->msg_in_size -= 4;
+ memmove (g->msg_in, g->msg_in+4, g->msg_in_size);
+ goto again;
+ }
+
+ /* If this happens, it's pretty bad and we've probably lost
+ * synchronization.
+ */
if (len > GUESTFS_MESSAGE_MAX) {
- error (g, "message length (%u) > maximum possible size (%d)",
+ error (g, _("message length (%u) > maximum possible size (%d)"),
len, GUESTFS_MESSAGE_MAX);
goto cleanup;
}
if (g->msg_in_size-4 < len) return; /* Need more of this message. */
- /* This should not happen, and if it does it probably means we've
- * lost all hope of synchronization.
- */
- if (g->msg_in_size-4 > len) {
- error (g, "len = %d, but msg_in_size-4 = %d", len, g->msg_in_size-4);
- goto cleanup;
+ /* Got the full message, begin processing it. */
+#if 0
+ if (g->verbose) {
+ int i, j;
+
+ for (i = 0; i < g->msg_in_size; i += 16) {
+ printf ("%04x: ", i);
+ for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
+ printf ("%02x ", (unsigned char) g->msg_in[j]);
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|");
+ for (j = i; j < MIN (i+16, g->msg_in_size); ++j)
+ if (isprint (g->msg_in[j]))
+ printf ("%c", g->msg_in[j]);
+ else
+ printf (".");
+ for (; j < i+16; ++j)
+ printf (" ");
+ printf ("|\n");
+ }
}
+#endif
/* Not in the expected state. */
if (g->state != BUSY)
- error (g, "state %d != BUSY", g->state);
+ error (g, _("state %d != BUSY"), g->state);
- /* Push the message up to the higher layer. Note that unlike
- * launch_done_cb / launch_done_cb_internal, we only call at
- * most one of the callback functions here.
- */
- g->state = READY;
- if (g->reply_cb_internal)
- g->reply_cb_internal (g, g->reply_cb_internal_data, &xdr);
- else if (g->reply_cb)
- g->reply_cb (g, g->reply_cb, &xdr);
+ /* Push the message up to the higher layer. */
+ if (g->reply_cb)
+ g->reply_cb (g, g->reply_cb_data, &xdr);
+ else
+ /* This message (probably) should never be printed. */
+ fprintf (stderr, "libguesfs: sock_read_event: !!! dropped message !!!\n");
+
+ g->msg_in_size -= len + 4;
+ memmove (g->msg_in, g->msg_in+len+4, g->msg_in_size);
+ if (g->msg_in_size > 0) goto again;
cleanup:
/* Free the message buffer if it's grown excessively large. */
* guestfsd (daemon inside the guest) communication socket.
*/
static void
-sock_write_event (void *data, int watch, int fd, int events)
+sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
+ int watch, int fd, int events)
{
- guestfs_h *g = (guestfs_h *) data;
- int n;
+ int n, err;
if (g->verbose)
fprintf (stderr,
g, g->state, fd, events);
if (g->sock != fd) {
- error (g, "sock_write_event: internal error: %d != %d", g->sock, fd);
+ error (g, _("sock_write_event: internal error: %d != %d"), g->sock, fd);
return;
}
if (g->state != BUSY) {
- error (g, "sock_write_event: state %d != BUSY", g->state);
+ error (g, _("sock_write_event: state %d != BUSY"), g->state);
return;
}
n = write (g->sock, g->msg_out + g->msg_out_pos,
g->msg_out_size - g->msg_out_pos);
if (n == -1) {
- if (errno != EAGAIN)
+ err = errno;
+ if (err != EAGAIN)
perrorf (g, "write");
+ if (err == EPIPE) /* Disconnected from guest (RHBZ#508713). */
+ child_cleanup (g);
return;
}
return;
if (g->verbose)
- fprintf (stderr, "sock_write_event: done writing, switching back to reading events\n");
+ fprintf (stderr, "sock_write_event: done writing, calling send_cb\n");
free (g->msg_out);
+ g->msg_out = NULL;
g->msg_out_pos = g->msg_out_size = 0;
- if (main_loop.remove_handle (g, g->sock_watch) == -1) {
- error (g, "remove_handle failed in sock_write_event");
- return;
+ /* Done writing, call the higher layer. */
+ if (g->send_cb)
+ g->send_cb (g, g->send_cb_data);
+}
+
+void
+guestfs_set_send_callback (guestfs_h *g,
+ guestfs_send_cb cb, void *opaque)
+{
+ g->send_cb = cb;
+ g->send_cb_data = opaque;
+}
+
+void
+guestfs_set_reply_callback (guestfs_h *g,
+ guestfs_reply_cb cb, void *opaque)
+{
+ g->reply_cb = cb;
+ g->reply_cb_data = opaque;
+}
+
+void
+guestfs_set_log_message_callback (guestfs_h *g,
+ guestfs_log_message_cb cb, void *opaque)
+{
+ g->log_message_cb = cb;
+ g->log_message_cb_data = opaque;
+}
+
+void
+guestfs_set_subprocess_quit_callback (guestfs_h *g,
+ guestfs_subprocess_quit_cb cb, void *opaque)
+{
+ g->subprocess_quit_cb = cb;
+ g->subprocess_quit_cb_data = opaque;
+}
+
+void
+guestfs_set_launch_done_callback (guestfs_h *g,
+ guestfs_launch_done_cb cb, void *opaque)
+{
+ g->launch_done_cb = cb;
+ g->launch_done_cb_data = opaque;
+}
+
+/* Access to the handle's main loop and the default main loop. */
+void
+guestfs_set_main_loop (guestfs_h *g, guestfs_main_loop *main_loop)
+{
+ g->main_loop = main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_main_loop (guestfs_h *g)
+{
+ return g->main_loop;
+}
+
+guestfs_main_loop *
+guestfs_get_default_main_loop (void)
+{
+ return (guestfs_main_loop *) &default_main_loop;
+}
+
+/* Change the daemon socket handler so that we are now writing.
+ * This sets the handle to sock_write_event.
+ */
+int
+guestfs__switch_to_sending (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
}
+
g->sock_watch =
- main_loop.add_handle (g, g->sock,
- GUESTFS_HANDLE_READABLE,
- sock_read_event, g);
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_WRITABLE,
+ sock_write_event, NULL);
if (g->sock_watch == -1) {
- error (g, "add_handle failed in sock_write_event");
- return;
+ error (g, _("add_handle failed"));
+ return -1;
}
+
+ return 0;
}
-/* Dispatch a call to the remote daemon. This function just queues
- * the call in msg_out, to be sent when we next enter the main loop.
- * Returns -1 for error, or the message serial number.
+int
+guestfs__switch_to_receiving (guestfs_h *g)
+{
+ if (g->sock_watch >= 0) {
+ if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
+ error (g, _("remove_handle failed"));
+ g->sock_watch = -1;
+ return -1;
+ }
+ }
+
+ g->sock_watch =
+ g->main_loop->add_handle (g->main_loop, g, g->sock,
+ GUESTFS_HANDLE_READABLE,
+ sock_read_event, NULL);
+ if (g->sock_watch == -1) {
+ error (g, _("add_handle failed"));
+ return -1;
+ }
+
+ return 0;
+}
+
+/* Dispatch a call (len + header + args) to the remote daemon,
+ * synchronously (ie. using the guest's main loop to wait until
+ * it has been sent). Returns -1 for error, or the serial
+ * number of the message.
*/
-static int
-dispatch (guestfs_h *g, int proc_nr, xdrproc_t xdrp, char *args)
+static void
+send_cb (guestfs_h *g, void *data)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ *((int *)data) = 1;
+ ml->main_loop_quit (ml, g);
+}
+
+int
+guestfs__send_sync (guestfs_h *g, int proc_nr,
+ xdrproc_t xdrp, char *args)
{
- char buffer[GUESTFS_MESSAGE_MAX];
struct guestfs_message_header hdr;
XDR xdr;
- unsigned len;
+ u_int32_t len;
int serial = g->msg_next_serial++;
+ int sent;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
- if (g->state != READY) {
- error (g, "dispatch: state %d != READY", g->state);
+ if (g->state != BUSY) {
+ error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
+ return -1;
+ }
+
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
return -1;
}
+ /* We have to allocate this message buffer on the heap because
+ * it is quite large (although will be mostly unused). We
+ * can't allocate it on the stack because in some environments
+ * we have quite limited stack space available, notably when
+ * running in the JVM.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MESSAGE_MAX + 4);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MESSAGE_MAX, XDR_ENCODE);
+
/* Serialize the header. */
hdr.prog = GUESTFS_PROGRAM;
hdr.vers = GUESTFS_PROTOCOL_VERSION;
hdr.serial = serial;
hdr.status = GUESTFS_STATUS_OK;
- xdrmem_create (&xdr, buffer, sizeof buffer, XDR_ENCODE);
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
- error (g, "xdr_guestfs_message_header failed");
- return -1;
+ error (g, _("xdr_guestfs_message_header failed"));
+ goto cleanup1;
}
/* Serialize the args. If any, because some message types
*/
if (xdrp) {
if (!(*xdrp) (&xdr, args)) {
- error (g, "dispatch failed to marshal args");
- return -1;
+ error (g, _("dispatch failed to marshal args"));
+ goto cleanup1;
}
}
+ /* Get the actual length of the message, resize the buffer to match
+ * the actual length, and write the length word at the beginning.
+ */
len = xdr_getpos (&xdr);
xdr_destroy (&xdr);
- /* Allocate the outgoing message buffer. */
- g->msg_out = safe_malloc (g, len + 4);
-
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
g->msg_out_size = len + 4;
g->msg_out_pos = 0;
- g->state = BUSY;
xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
- if (!xdr_uint32_t (&xdr, &len)) {
- error (g, "xdr_uint32_t failed in dispatch");
+ xdr_uint32_t (&xdr, &len);
+
+ if (guestfs__switch_to_sending (g) == -1)
+ goto cleanup1;
+
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
+ goto cleanup1;
+ if (sent != 1) {
+ error (g, _("send failed, see earlier error messages"));
goto cleanup1;
}
- memcpy (g->msg_out + 4, buffer, len);
+ return serial;
+
+ cleanup1:
+ free (g->msg_out);
+ g->msg_out = NULL;
+ g->msg_out_size = 0;
+ return -1;
+}
+
+static int cancel = 0; /* XXX Implement file cancellation. */
+static int send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t len);
+static int send_file_data_sync (guestfs_h *g, const char *buf, size_t len);
+static int send_file_cancellation_sync (guestfs_h *g);
+static int send_file_complete_sync (guestfs_h *g);
+
+/* Synchronously send a file.
+ * Returns:
+ * 0 OK
+ * -1 error
+ * -2 daemon cancelled (we must read the error message)
+ */
+int
+guestfs__send_file_sync (guestfs_h *g, const char *filename)
+{
+ char buf[GUESTFS_MAX_CHUNK_SIZE];
+ int fd, r, err;
+
+ fd = open (filename, O_RDONLY);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ send_file_cancellation_sync (g);
+ /* Daemon sees cancellation and won't reply, so caller can
+ * just return here.
+ */
+ return -1;
+ }
- /* Change the handle to sock_write_event. */
- if (main_loop.remove_handle (g, g->sock_watch) == -1) {
- error (g, "remove_handle failed in dispatch");
+ /* Send file in chunked encoding. */
+ while (!cancel) {
+ r = read (fd, buf, sizeof buf);
+ if (r == -1 && (errno == EINTR || errno == EAGAIN))
+ continue;
+ if (r <= 0) break;
+ err = send_file_data_sync (g, buf, r);
+ if (err < 0) {
+ if (err == -2) /* daemon sent cancellation */
+ send_file_cancellation_sync (g);
+ return err;
+ }
+ }
+
+ if (cancel) { /* cancel from either end */
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ if (r == -1) {
+ perrorf (g, "read: %s", filename);
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ /* End of file, but before we send that, we need to close
+ * the file and check for errors.
+ */
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ send_file_cancellation_sync (g);
+ return -1;
+ }
+
+ return send_file_complete_sync (g);
+}
+
+/* Send a chunk of file data. */
+static int
+send_file_data_sync (guestfs_h *g, const char *buf, size_t len)
+{
+ return send_file_chunk_sync (g, 0, buf, len);
+}
+
+/* Send a cancellation message. */
+static int
+send_file_cancellation_sync (guestfs_h *g)
+{
+ return send_file_chunk_sync (g, 1, NULL, 0);
+}
+
+/* Send a file complete chunk. */
+static int
+send_file_complete_sync (guestfs_h *g)
+{
+ char buf[1];
+ return send_file_chunk_sync (g, 0, buf, 0);
+}
+
+/* Send a chunk, cancellation or end of file, synchronously (ie. wait
+ * for it to go).
+ */
+static int check_for_daemon_cancellation (guestfs_h *g);
+
+static int
+send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
+{
+ u_int32_t len;
+ int sent;
+ guestfs_chunk chunk;
+ XDR xdr;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+
+ if (g->state != BUSY) {
+ error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
+ return -1;
+ }
+
+ /* This is probably an internal error. Or perhaps we should just
+ * free the buffer anyway?
+ */
+ if (g->msg_out != NULL) {
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
+ return -1;
+ }
+
+ /* Did the daemon send a cancellation message? */
+ if (check_for_daemon_cancellation (g)) {
+ if (g->verbose)
+ fprintf (stderr, "got daemon cancellation\n");
+ return -2;
+ }
+
+ /* Allocate the chunk buffer. Don't use the stack to avoid
+ * excessive stack usage and unnecessary copies.
+ */
+ g->msg_out = safe_malloc (g, GUESTFS_MAX_CHUNK_SIZE + 4 + 48);
+ xdrmem_create (&xdr, g->msg_out + 4, GUESTFS_MAX_CHUNK_SIZE + 48, XDR_ENCODE);
+
+ /* Serialize the chunk. */
+ chunk.cancel = cancel;
+ chunk.data.data_len = buflen;
+ chunk.data.data_val = (char *) buf;
+
+ if (!xdr_guestfs_chunk (&xdr, &chunk)) {
+ error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
+ buf, buflen);
+ xdr_destroy (&xdr);
goto cleanup1;
}
- g->sock_watch =
- main_loop.add_handle (g, g->sock,
- GUESTFS_HANDLE_WRITABLE,
- sock_write_event, g);
- if (g->sock_watch == -1) {
- error (g, "add_handle failed in dispatch");
+
+ len = xdr_getpos (&xdr);
+ xdr_destroy (&xdr);
+
+ /* Reduce the size of the outgoing message buffer to the real length. */
+ g->msg_out = safe_realloc (g, g->msg_out, len + 4);
+ g->msg_out_size = len + 4;
+ g->msg_out_pos = 0;
+
+ xdrmem_create (&xdr, g->msg_out, 4, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &len);
+
+ if (guestfs__switch_to_sending (g) == -1)
+ goto cleanup1;
+
+ sent = 0;
+ guestfs_set_send_callback (g, send_cb, &sent);
+ if (ml->main_loop_run (ml, g) == -1)
+ goto cleanup1;
+ if (sent != 1) {
+ error (g, _("send file chunk failed, see earlier error messages"));
goto cleanup1;
}
- return serial;
+ return 0;
cleanup1:
free (g->msg_out);
g->msg_out = NULL;
g->msg_out_size = 0;
- g->state = READY;
return -1;
}
-/* The high-level actions are autogenerated by generator.ml. Include
- * them here.
+/* At this point we are sending FileIn file(s) to the guest, and not
+ * expecting to read anything, so if we do read anything, it must be
+ * a cancellation message. This checks for this case without blocking.
*/
-#include "guestfs-actions.c"
+static int
+check_for_daemon_cancellation (guestfs_h *g)
+{
+ fd_set rset;
+ struct timeval tv;
+ int r;
+ char buf[4];
+ uint32_t flag;
+ XDR xdr;
-/* This is the default main loop implementation, using select(2). */
+ FD_ZERO (&rset);
+ FD_SET (g->sock, &rset);
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
+ r = select (g->sock+1, &rset, NULL, NULL, &tv);
+ if (r == -1) {
+ perrorf (g, "select");
+ return 0;
+ }
+ if (r == 0)
+ return 0;
-struct handle_cb_data {
- guestfs_handle_event_cb cb;
- void *data;
+ /* Read the message from the daemon. */
+ r = xread (g->sock, buf, sizeof buf);
+ if (r == -1) {
+ perrorf (g, "read");
+ return 0;
+ }
+
+ xdrmem_create (&xdr, buf, sizeof buf, XDR_DECODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (flag != GUESTFS_CANCEL_FLAG) {
+ error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
+ flag, GUESTFS_CANCEL_FLAG);
+ return 0;
+ }
+
+ return 1;
+}
+
+/* Synchronously receive a file. */
+
+/* Returns -1 = error, 0 = EOF, 1 = more data */
+static int receive_file_data_sync (guestfs_h *g, void **buf, size_t *len);
+
+int
+guestfs__receive_file_sync (guestfs_h *g, const char *filename)
+{
+ void *buf;
+ int fd, r;
+ size_t len;
+
+ fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
+ if (fd == -1) {
+ perrorf (g, "open: %s", filename);
+ goto cancel;
+ }
+
+ /* Receive the file in chunked encoding. */
+ while ((r = receive_file_data_sync (g, &buf, &len)) >= 0) {
+ if (xwrite (fd, buf, len) == -1) {
+ perrorf (g, "%s: write", filename);
+ free (buf);
+ goto cancel;
+ }
+ free (buf);
+ if (r == 0) break; /* End of file. */
+ }
+
+ if (r == -1) {
+ error (g, _("%s: error in chunked encoding"), filename);
+ return -1;
+ }
+
+ if (close (fd) == -1) {
+ perrorf (g, "close: %s", filename);
+ return -1;
+ }
+
+ return 0;
+
+ cancel: ;
+ /* Send cancellation message to daemon, then wait until it
+ * cancels (just throwing away data).
+ */
+ XDR xdr;
+ char fbuf[4];
+ uint32_t flag = GUESTFS_CANCEL_FLAG;
+
+ if (g->verbose)
+ fprintf (stderr, "%s: waiting for daemon to acknowledge cancellation\n",
+ __func__);
+
+ xdrmem_create (&xdr, fbuf, sizeof fbuf, XDR_ENCODE);
+ xdr_uint32_t (&xdr, &flag);
+ xdr_destroy (&xdr);
+
+ if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
+ perrorf (g, _("write to daemon socket"));
+ return -1;
+ }
+
+ while ((r = receive_file_data_sync (g, NULL, NULL)) > 0)
+ ; /* just discard it */
+
+ return -1;
+}
+
+/* Note that the reply callback can be called multiple times before
+ * the main loop quits and we get back to the synchronous code. So
+ * we have to be prepared to save multiple chunks on a list here.
+ */
+struct receive_file_ctx {
+ int count; /* 0 if receive_file_cb not called, or
+ * else count number of chunks.
+ */
+ guestfs_chunk *chunks; /* Array of chunks. */
};
-static fd_set rset;
-static fd_set wset;
-static fd_set xset;
-static int select_init_done = 0;
-static int max_fd = -1;
-static int nr_fds = 0;
-static struct handle_cb_data *handle_cb_data = NULL;
+static void
+free_chunks (struct receive_file_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->count; ++i)
+ free (ctx->chunks[i].data.data_val);
+
+ free (ctx->chunks);
+}
static void
-select_init (void)
+receive_file_cb (guestfs_h *g, void *data, XDR *xdr)
+{
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ struct receive_file_ctx *ctx = (struct receive_file_ctx *) data;
+ guestfs_chunk chunk;
+
+ if (ctx->count == -1) /* Parse error occurred previously. */
+ return;
+
+ ml->main_loop_quit (ml, g);
+
+ memset (&chunk, 0, sizeof chunk);
+
+ if (!xdr_guestfs_chunk (xdr, &chunk)) {
+ error (g, _("failed to parse file chunk"));
+ free_chunks (ctx);
+ ctx->chunks = NULL;
+ ctx->count = -1;
+ return;
+ }
+
+ /* Copy the chunk to the list. */
+ ctx->chunks = safe_realloc (g, ctx->chunks,
+ sizeof (guestfs_chunk) * (ctx->count+1));
+ ctx->chunks[ctx->count] = chunk;
+ ctx->count++;
+}
+
+/* Receive a chunk of file data. */
+/* Returns -1 = error, 0 = EOF, 1 = more data */
+static int
+receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
{
- if (!select_init_done) {
- FD_ZERO (&rset);
- FD_ZERO (&wset);
- FD_ZERO (&xset);
+ struct receive_file_ctx ctx;
+ guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ int i;
+ size_t len;
+
+ ctx.count = 0;
+ ctx.chunks = NULL;
+
+ guestfs_set_reply_callback (g, receive_file_cb, &ctx);
+ (void) ml->main_loop_run (ml, g);
+ guestfs_set_reply_callback (g, NULL, NULL);
+
+ if (ctx.count == 0) {
+ error (g, _("receive_file_data_sync: reply callback not called\n"));
+ return -1;
+ }
+
+ if (ctx.count == -1) {
+ error (g, _("receive_file_data_sync: parse error in reply callback\n"));
+ /* callback already freed the chunks */
+ return -1;
+ }
+
+ if (g->verbose)
+ fprintf (stderr, "receive_file_data_sync: got %d chunks\n", ctx.count);
+
+ /* Process each chunk in the list. */
+ if (buf) *buf = NULL; /* Accumulate data in this buffer. */
+ len = 0;
+
+ for (i = 0; i < ctx.count; ++i) {
+ if (ctx.chunks[i].cancel) {
+ error (g, _("file receive cancelled by daemon"));
+ free_chunks (&ctx);
+ if (buf) free (*buf);
+ if (len_r) *len_r = 0;
+ return -1;
+ }
+
+ if (ctx.chunks[i].data.data_len == 0) { /* end of transfer */
+ free_chunks (&ctx);
+ if (len_r) *len_r = len;
+ return 0;
+ }
- select_init_done = 1;
+ if (buf) {
+ *buf = safe_realloc (g, *buf, len + ctx.chunks[i].data.data_len);
+ memcpy (*buf+len, ctx.chunks[i].data.data_val,
+ ctx.chunks[i].data.data_len);
+ }
+ len += ctx.chunks[i].data.data_len;
}
+
+ if (len_r) *len_r = len;
+ free_chunks (&ctx);
+ return 1;
}
+/* This is the default main loop implementation, using select(2). */
+
static int
-select_add_handle (guestfs_h *g, int fd, int events,
+select_add_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd, int events,
guestfs_handle_event_cb cb, void *data)
{
- select_init ();
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, "fd %d is out of range", fd);
+ error (g, _("fd %d is out of range"), fd);
return -1;
}
GUESTFS_HANDLE_WRITABLE |
GUESTFS_HANDLE_HANGUP |
GUESTFS_HANDLE_ERROR)) != 0) {
- error (g, "set of events (0x%x) contains unknown events", events);
+ error (g, _("set of events (0x%x) contains unknown events"), events);
return -1;
}
if (events == 0) {
- error (g, "set of events is empty");
+ error (g, _("set of events is empty"));
return -1;
}
- if (FD_ISSET (fd, &rset) || FD_ISSET (fd, &wset) || FD_ISSET (fd, &xset)) {
- error (g, "fd %d is already registered", fd);
+ if (FD_ISSET (fd, &ml->rset) ||
+ FD_ISSET (fd, &ml->wset) ||
+ FD_ISSET (fd, &ml->xset)) {
+ error (g, _("fd %d is already registered"), fd);
return -1;
}
if (cb == NULL) {
- error (g, "callback is NULL");
+ error (g, _("callback is NULL"));
return -1;
}
if ((events & GUESTFS_HANDLE_READABLE))
- FD_SET (fd, &rset);
+ FD_SET (fd, &ml->rset);
if ((events & GUESTFS_HANDLE_WRITABLE))
- FD_SET (fd, &wset);
+ FD_SET (fd, &ml->wset);
if ((events & GUESTFS_HANDLE_HANGUP) || (events & GUESTFS_HANDLE_ERROR))
- FD_SET (fd, &xset);
+ FD_SET (fd, &ml->xset);
- if (fd > max_fd) {
- max_fd = fd;
- handle_cb_data = safe_realloc (g, handle_cb_data,
- sizeof (struct handle_cb_data) * (max_fd+1));
+ if (fd > ml->max_fd) {
+ ml->max_fd = fd;
+ ml->handle_cb_data =
+ safe_realloc (g, ml->handle_cb_data,
+ sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
}
- handle_cb_data[fd].cb = cb;
- handle_cb_data[fd].data = data;
+ ml->handle_cb_data[fd].cb = cb;
+ ml->handle_cb_data[fd].g = g;
+ ml->handle_cb_data[fd].data = data;
- nr_fds++;
+ ml->nr_fds++;
/* Any integer >= 0 can be the handle, and this is as good as any ... */
return fd;
}
static int
-select_remove_handle (guestfs_h *g, int fd)
+select_remove_handle (guestfs_main_loop *mlv, guestfs_h *g, int fd)
{
- select_init ();
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
if (fd < 0 || fd >= FD_SETSIZE) {
- error (g, "fd %d is out of range", fd);
+ error (g, _("fd %d is out of range"), fd);
return -1;
}
- if (!FD_ISSET (fd, &rset) && !FD_ISSET (fd, &wset) && !FD_ISSET (fd, &xset)) {
- error (g, "fd %d was not registered", fd);
+ if (!FD_ISSET (fd, &ml->rset) &&
+ !FD_ISSET (fd, &ml->wset) &&
+ !FD_ISSET (fd, &ml->xset)) {
+ error (g, _("fd %d was not registered"), fd);
return -1;
}
- FD_CLR (fd, &rset);
- FD_CLR (fd, &wset);
- FD_CLR (fd, &xset);
+ FD_CLR (fd, &ml->rset);
+ FD_CLR (fd, &ml->wset);
+ FD_CLR (fd, &ml->xset);
- if (fd == max_fd) {
- max_fd--;
- handle_cb_data = safe_realloc (g, handle_cb_data,
- sizeof (struct handle_cb_data) * (max_fd+1));
+ if (fd == ml->max_fd) {
+ ml->max_fd--;
+ ml->handle_cb_data =
+ safe_realloc (g, ml->handle_cb_data,
+ sizeof (struct select_handle_cb_data) * (ml->max_fd+1));
}
- nr_fds--;
+ ml->nr_fds--;
return 0;
}
static int
-select_add_timeout (guestfs_h *g, int interval,
+select_add_timeout (guestfs_main_loop *mlv, guestfs_h *g, int interval,
guestfs_handle_timeout_cb cb, void *data)
{
- select_init ();
+ //struct select_main_loop *ml = (struct select_main_loop *) mlv;
abort (); /* XXX not implemented yet */
}
static int
-select_remove_timeout (guestfs_h *g, int timer)
+select_remove_timeout (guestfs_main_loop *mlv, guestfs_h *g, int timer)
{
- select_init ();
+ //struct select_main_loop *ml = (struct select_main_loop *) mlv;
abort (); /* XXX not implemented yet */
}
-/* Note that main loops can be nested. */
-static int level = 0;
-
-static void
-select_main_loop_run (guestfs_h *g)
+/* The 'g' parameter is just used for error reporting. Events
+ * for multiple handles can be dispatched by running the main
+ * loop.
+ */
+static int
+select_main_loop_run (guestfs_main_loop *mlv, guestfs_h *g)
{
- int old_level, fd, r, events;
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
+ int fd, r, events;
fd_set rset2, wset2, xset2;
- select_init ();
+ if (ml->is_running) {
+ error (g, _("select_main_loop_run: this cannot be called recursively"));
+ return -1;
+ }
+
+ ml->is_running = 1;
- old_level = level++;
- while (level > old_level) {
- if (nr_fds == 0) {
- level = old_level;
+ while (ml->is_running) {
+ if (ml->nr_fds == 0)
break;
- }
- rset2 = rset;
- wset2 = wset;
- xset2 = xset;
- r = select (max_fd+1, &rset2, &wset2, &xset2, NULL);
+ rset2 = ml->rset;
+ wset2 = ml->wset;
+ xset2 = ml->xset;
+ r = select (ml->max_fd+1, &rset2, &wset2, &xset2, NULL);
if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
perrorf (g, "select");
- level = old_level;
- break;
+ ml->is_running = 0;
+ return -1;
}
- for (fd = 0; r > 0 && fd <= max_fd; ++fd) {
+ for (fd = 0; r > 0 && fd <= ml->max_fd; ++fd) {
events = 0;
if (FD_ISSET (fd, &rset2))
events |= GUESTFS_HANDLE_READABLE;
events |= GUESTFS_HANDLE_ERROR | GUESTFS_HANDLE_HANGUP;
if (events) {
r--;
- handle_cb_data[fd].cb (handle_cb_data[fd].data,
- fd, fd, events);
+ ml->handle_cb_data[fd].cb ((guestfs_main_loop *) ml,
+ ml->handle_cb_data[fd].g,
+ ml->handle_cb_data[fd].data,
+ fd, fd, events);
}
}
}
+
+ ml->is_running = 0;
+ return 0;
}
-static void
-select_main_loop_quit (guestfs_h *g)
+static int
+select_main_loop_quit (guestfs_main_loop *mlv, guestfs_h *g)
{
- select_init ();
+ struct select_main_loop *ml = (struct select_main_loop *) mlv;
- if (level == 0) {
- error (g, "cannot quit, we are not in a main loop");
- return;
- }
+ /* Note that legitimately ml->is_running can be zero when
+ * this function is called.
+ */
- level--;
+ ml->is_running = 0;
+ return 0;
}
git.annexia.org / libguestfs.git / blobdiff