/* 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 <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
+#include <stddef.h>
#include <unistd.h>
#include <ctype.h>
#include <string.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"
+#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
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;
- const char *path;
- const char *qemu;
+ 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;
g->verbose = str != NULL && strcmp (str, "1") == 0;
str = getenv ("LIBGUESTFS_PATH");
- g->path = str != NULL ? str : GUESTFS_DEFAULT_PATH;
+ g->path = str != NULL ? strdup (str) : strdup (GUESTFS_DEFAULT_PATH);
+ if (!g->path) goto error;
str = getenv ("LIBGUESTFS_QEMU");
- g->qemu = str != NULL ? str : 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 ();
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
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;
}
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)
+ 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.
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);
}
/* 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);
}
static void
default_error_cb (guestfs_h *g, void *data, const char *msg)
{
- fprintf (stderr, "libguestfs: error: %s\n", msg);
+ fprintf (stderr, _("libguestfs: error: %s\n"), msg);
}
void
char *msg;
va_start (args, fs);
- vasprintf (&msg, fs, args);
+ int err = vasprintf (&msg, fs, args);
va_end (args);
+ if (err < 0) return;
+
if (g->error_cb) g->error_cb (g, g->error_cb_data, msg);
set_last_error (g, msg);
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;
}
+/* 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;
}
while (len > 0) {
r = read (fd, buf, len);
- if (r == -1)
+ if (r == -1) {
+ if (errno == EINTR || errno == EAGAIN)
+ continue;
return -1;
+ }
buf += r;
len -= r;
int
guestfs_set_path (guestfs_h *g, const char *path)
{
- if (path == NULL)
- g->path = GUESTFS_DEFAULT_PATH;
- else
- g->path = path;
+ free (g->path);
+ g->path = NULL;
+
+ g->path =
+ path == NULL ?
+ safe_strdup (g, GUESTFS_DEFAULT_PATH) : safe_strdup (g, path);
return 0;
}
int
guestfs_set_qemu (guestfs_h *g, const char *qemu)
{
- if (qemu == NULL)
- g->qemu = QEMU;
- else
- g->qemu = qemu;
+ free (g->qemu);
+ g->qemu = NULL;
+
+ g->qemu = qemu == NULL ? safe_strdup (g, QEMU) : safe_strdup (g, qemu);
return 0;
}
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;
+}
+
/* 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;
}
return -1;
}
- snprintf (buf, len, "file=%s", filename);
+ 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;
}
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, len, pmore, memsize;
+ int r, i, pmore;
+ size_t len;
int wfd[2], rfd[2];
int tries;
- const char *kernel_name = "vmlinuz." REPO "." host_cpu;
- const char *initrd_name = "initramfs." REPO "." host_cpu ".img";
char *path, *pelem, *pend;
char *kernel = NULL, *initrd = NULL;
char unixsock[256];
struct sockaddr_un addr;
- struct stat statbuf;
/* 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;
}
- /* Search g->path for the kernel and initrd. */
+ /* 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);
+ 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, ':');
*pend = '\0';
len = pend - pelem;
- /* Empty element or "." means cwd. */
+ /* Empty element of "." means cwd. */
if (len == 0 || (len == 1 && *pelem == '.')) {
if (g->verbose)
fprintf (stderr,
- "looking for kernel and initrd in current directory\n");
- if (access (kernel_name, F_OK) == 0 && access (initrd_name, F_OK) == 0) {
- kernel = safe_strdup (g, kernel_name);
- initrd = safe_strdup (g, initrd_name);
+ "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>/kernel etc. */
+ /* Look at <path>/supermin* etc. */
else {
- 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);
-
if (g->verbose)
- fprintf (stderr, "looking for %s and %s\n", kernel, initrd);
+ fprintf (stderr, "looking for supermin appliance in %s\n", pelem);
- if (access (kernel, F_OK) == 0 && access (initrd, F_OK) == 0)
+ 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;
- free (kernel);
- free (initrd);
- kernel = initrd = NULL;
+ }
}
pelem = pend + 1;
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;
- }
-
- /* Choose a suitable memory size (in MB). This is more art
- * than science, but you can help by doing
- * ./configure --enable-debug-command
- * and then running:
- * debug sh free
- * debug mem ''
- * and seeing how much free memory is left for particular
- * configurations.
- *
- * It's also helpful to report both the compressed and uncompressed
- * size of the initramfs (ls -lh initramfs*.img; du -sh initramfs).
- *
- * XXX KVM virtio balloon driver?
- */
- if (stat (initrd, &statbuf) != -1) {
- /* Approximate size of the initramfs after it is decompressed
- * in kernel memory. The compression factor is ~2.5-3.
- */
- memsize = 3 * statbuf.st_size / 1024 / 1024;
-
- /* Approximate size used by the kernel. */
- memsize += 10;
+ /* 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;
+ }
+ }
- /* Want to give userspace some room, so: */
- memsize += 128;
+ pelem = pend + 1;
+ } while (pmore);
-#if SIZEOF_LONG == 8
- /* On 64 bit, assume some overhead. */
- memsize += 64;
-#endif
- } else
- memsize = 512;
-
+ free (path);
+ }
- /* Make the temporary directory containing the socket. */
- if (!g->tmpdir) {
- g->tmpdir = safe_strdup (g, dir_template);
- if (mkdtemp (g->tmpdir) == NULL) {
- perrorf (g, "%s: cannot create temporary directory", dir_template);
- goto cleanup0;
- }
+ 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);
/* 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 *) g->qemu;
+ g->cmdline[0] = g->qemu;
/* Construct the -net channel parameter for qemu. */
snprintf (vmchannel, sizeof vmchannel,
/* Linux kernel command line. */
snprintf (append, sizeof append,
- "console=ttyS0 guestfs=%s:%d%s",
+ "panic=1 console=ttyS0 guestfs=%s:%d%s%s%s",
VMCHANNEL_ADDR, VMCHANNEL_PORT,
- g->verbose ? " guestfs_verbose=1" : "");
+ g->verbose ? " guestfs_verbose=1" : "",
+ g->append ? " " : "", g->append ? g->append : "");
- snprintf (memsize_str, sizeof memsize_str, "%d", memsize);
+ snprintf (memsize_str, sizeof memsize_str, "%d", g->memsize);
add_cmdline (g, "-m");
add_cmdline (g, memsize_str);
-#if 0
- add_cmdline (g, "-no-kqemu"); /* Avoids a warning. */
-#endif
+ 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, "-net");
add_cmdline (g, "user,vlan=0");
add_cmdline (g, "-net");
- add_cmdline (g, "nic,model=rtl8139,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;
/* Parent (library). */
g->pid = r;
+ free (kernel);
+ kernel = NULL;
+ free (initrd);
+ initrd = NULL;
+
/* Fork the recovery process off which will kill qemu if the parent
* process fails to do so (eg. if the parent segfaults).
*/
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:
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;
}
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->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;
}
if (r == -1) return -1;
if (finished != 1) {
- error (g, "guestfs_wait_ready failed, see earlier error messages");
+ 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;
}
guestfs_set_ready (guestfs_h *g)
{
if (g->state != BUSY) {
- error (g, "guestfs_set_ready: called when in state %d != BUSY", g->state);
+ error (g, _("guestfs_set_ready: called when in state %d != BUSY"),
+ g->state);
return -1;
}
g->state = READY;
guestfs_set_busy (guestfs_h *g)
{
if (g->state != READY) {
- error (g, "guestfs_set_busy: called when in state %d != READY", g->state);
+ 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;
+}
+
/* Structure-freeing functions. These rely on the fact that the
* structure format is identical to the XDR format. See note in
* generator.ml.
free (x);
}
+void
+guestfs_free_dirent_list (struct guestfs_dirent_list *x)
+{
+ xdr_free ((xdrproc_t) xdr_guestfs_int_dirent_list, (char *) x);
+ free (x);
+}
+
+/* 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.
#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);*/
- 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);
+ child_cleanup (g);
return;
}
if (n == -1) {
- if (errno != EAGAIN)
+ if (errno != EINTR && errno != EAGAIN)
perrorf (g, "read");
return;
}
int watch, int fd, int events)
{
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;
}
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;
}
*/
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;
* 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. */
/* Got the full message, begin processing it. */
+#if 0
if (g->verbose) {
int i, j;
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. */
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);
sock_write_event (struct guestfs_main_loop *ml, guestfs_h *g, void *data,
int watch, int fd, int events)
{
- 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;
}
{
if (g->sock_watch >= 0) {
if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, "remove_handle failed");
+ error (g, _("remove_handle failed"));
g->sock_watch = -1;
return -1;
}
GUESTFS_HANDLE_WRITABLE,
sock_write_event, NULL);
if (g->sock_watch == -1) {
- error (g, "add_handle failed");
+ error (g, _("add_handle failed"));
return -1;
}
{
if (g->sock_watch >= 0) {
if (g->main_loop->remove_handle (g->main_loop, g, g->sock_watch) == -1) {
- error (g, "remove_handle failed");
+ error (g, _("remove_handle failed"));
g->sock_watch = -1;
return -1;
}
GUESTFS_HANDLE_READABLE,
sock_read_event, NULL);
if (g->sock_watch == -1) {
- error (g, "add_handle failed");
+ error (g, _("add_handle failed"));
return -1;
}
{
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 != BUSY) {
- error (g, "guestfs__send_sync: state %d != BUSY", g->state);
+ error (g, _("guestfs__send_sync: state %d != BUSY"), g->state);
return -1;
}
* free the buffer anyway?
*/
if (g->msg_out != NULL) {
- error (g, "guestfs__send_sync: msg_out should be NULL");
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
return -1;
}
hdr.status = GUESTFS_STATUS_OK;
if (!xdr_guestfs_message_header (&xdr, &hdr)) {
- error (g, "xdr_guestfs_message_header failed");
+ error (g, _("xdr_guestfs_message_header failed"));
goto cleanup1;
}
*/
if (xdrp) {
if (!(*xdrp) (&xdr, args)) {
- error (g, "dispatch failed to marshal args");
+ error (g, _("dispatch failed to marshal args"));
goto cleanup1;
}
}
if (ml->main_loop_run (ml, g) == -1)
goto cleanup1;
if (sent != 1) {
- error (g, "send failed, see earlier error messages");
+ error (g, _("send failed, see earlier error messages"));
goto cleanup1;
}
}
/* Send file in chunked encoding. */
- while (!cancel && (r = read (fd, buf, sizeof buf)) > 0) {
+ 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 */
static int
send_file_chunk_sync (guestfs_h *g, int cancel, const char *buf, size_t buflen)
{
- unsigned len;
+ 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);
+ error (g, _("send_file_chunk_sync: state %d != READY"), g->state);
return -1;
}
* free the buffer anyway?
*/
if (g->msg_out != NULL) {
- error (g, "guestfs__send_sync: msg_out should be NULL");
+ error (g, _("guestfs__send_sync: msg_out should be NULL"));
return -1;
}
chunk.data.data_val = (char *) buf;
if (!xdr_guestfs_chunk (&xdr, &chunk)) {
- error (g, "xdr_guestfs_chunk failed (buf = %p, buflen = %zu)",
+ error (g, _("xdr_guestfs_chunk failed (buf = %p, buflen = %zu)"),
buf, buflen);
xdr_destroy (&xdr);
goto cleanup1;
if (ml->main_loop_run (ml, g) == -1)
goto cleanup1;
if (sent != 1) {
- error (g, "send file chunk failed, see earlier error messages");
+ error (g, _("send file chunk failed, see earlier error messages"));
goto cleanup1;
}
xdr_destroy (&xdr);
if (flag != GUESTFS_CANCEL_FLAG) {
- error (g, "check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n",
+ error (g, _("check_for_daemon_cancellation: read 0x%x from daemon, expected 0x%x\n"),
flag, GUESTFS_CANCEL_FLAG);
return 0;
}
/* Synchronously receive a file. */
-static int receive_file_data_sync (guestfs_h *g, void **buf);
+/* 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) {
}
/* Receive the file in chunked encoding. */
- while ((r = receive_file_data_sync (g, &buf)) > 0) {
- if (xwrite (fd, buf, r) == -1) {
+ 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);
+ error (g, _("%s: error in chunked encoding"), filename);
return -1;
}
xdr_destroy (&xdr);
if (xwrite (g->sock, fbuf, sizeof fbuf) == -1) {
- perrorf (g, "write to daemon socket");
+ perrorf (g, _("write to daemon socket"));
return -1;
}
- while ((r = receive_file_data_sync (g, &buf)) > 0)
- free (buf); /* just discard it */
+ 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 code;
- void **buf;
+ int count; /* 0 if receive_file_cb not called, or
+ * else count number of chunks.
+ */
+ guestfs_chunk *chunks; /* Array of chunks. */
};
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
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");
- ctx->code = -1;
- return;
- }
- if (chunk.cancel) {
- error (g, "file receive cancelled by daemon");
- ctx->code = -2;
- return;
- }
- if (chunk.data.data_len == 0) { /* end of transfer */
- ctx->code = 0;
+ error (g, _("failed to parse file chunk"));
+ free_chunks (ctx);
+ ctx->chunks = NULL;
+ ctx->count = -1;
return;
}
- ctx->code = chunk.data.data_len;
- *ctx->buf = chunk.data.data_val; /* caller frees */
+ /* 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)
+receive_file_data_sync (guestfs_h *g, void **buf, size_t *len_r)
{
struct receive_file_ctx ctx;
guestfs_main_loop *ml = guestfs_get_main_loop (g);
+ int i;
+ size_t len;
- ctx.code = -3;
- ctx.buf = buf;
+ 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 (g->verbose)
- fprintf (stderr, "receive_file_data_sync: code %d\n", ctx.code);
-
- switch (ctx.code) {
- case 0: /* end of file */
- return 0;
- case -1: case -2:
+ if (ctx.count == 0) {
+ error (g, _("receive_file_data_sync: reply callback not called\n"));
return -1;
- case -3:
- error (g, "failed to call receive_file_cb");
+ }
+
+ if (ctx.count == -1) {
+ error (g, _("receive_file_data_sync: parse error in reply callback\n"));
+ /* callback already freed the chunks */
return -1;
- default: /* received n bytes of data */
- return ctx.code;
}
+
+ 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;
+ }
+
+ 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). */
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, &ml->rset) ||
FD_ISSET (fd, &ml->wset) ||
FD_ISSET (fd, &ml->xset)) {
- error (g, "fd %d is already registered", fd);
+ 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;
}
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, &ml->rset) &&
!FD_ISSET (fd, &ml->wset) &&
!FD_ISSET (fd, &ml->xset)) {
- error (g, "fd %d was not registered", fd);
+ error (g, _("fd %d was not registered"), fd);
return -1;
}
fd_set rset2, wset2, xset2;
if (ml->is_running) {
- error (g, "select_main_loop_run: this cannot be called recursively");
+ error (g, _("select_main_loop_run: this cannot be called recursively"));
return -1;
}
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");
ml->is_running = 0;
return -1;
git.annexia.org / libguestfs.git / blobdiff