#include <netinet/in.h>
#include "c-ctype.h"
+#include "ignore-value.h"
#include "glthread/lock.h"
#include "guestfs.h"
static int launch_appliance (guestfs_h *g);
static int64_t timeval_diff (const struct timeval *x, const struct timeval *y);
+static void print_qemu_command_line (guestfs_h *g, char **argv);
static int connect_unix_socket (guestfs_h *g, const char *sock);
static int qemu_supports (guestfs_h *g, const char *option);
+static char *qemu_drive_param (guestfs_h *g, const struct drive *drv);
+
+#if 0
+static int qemu_supports_re (guestfs_h *g, const pcre *option_regex);
+
+static void compile_regexps (void) __attribute__((constructor));
+static void free_regexps (void) __attribute__((destructor));
-/* Add a string to the current command line. */
static void
-incr_cmdline_size (guestfs_h *g)
+compile_regexps (void)
+{
+ const char *err;
+ int offset;
+
+#define COMPILE(re,pattern,options) \
+ do { \
+ re = pcre_compile ((pattern), (options), &err, &offset, NULL); \
+ if (re == NULL) { \
+ ignore_value (write (2, err, strlen (err))); \
+ abort (); \
+ } \
+ } while (0)
+}
+
+static void
+free_regexps (void)
+{
+}
+#endif
+
+/* Functions to add a string to the current command line. */
+static void
+alloc_cmdline (guestfs_h *g)
{
if (g->cmdline == NULL) {
/* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
g->cmdline = safe_malloc (g, sizeof (char *));
g->cmdline[0] = NULL;
}
+}
+static void
+incr_cmdline_size (guestfs_h *g)
+{
+ alloc_cmdline (g);
g->cmdline_size++;
g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
}
return 0;
}
-size_t
-guestfs___checkpoint_cmdline (guestfs_h *g)
+struct drive **
+guestfs___checkpoint_drives (guestfs_h *g)
{
- return g->cmdline_size;
+ struct drive **i = &g->drives;
+ while (*i != NULL) i = &((*i)->next);
+ return i;
}
void
-guestfs___rollback_cmdline (guestfs_h *g, size_t pos)
+guestfs___rollback_drives (guestfs_h *g, struct drive **i)
{
- size_t i;
-
- assert (g->cmdline_size >= pos);
-
- for (i = pos; i < g->cmdline_size; ++i)
- free (g->cmdline[i]);
-
- g->cmdline_size = pos;
+ guestfs___free_drives(i);
}
/* Internal command to return the command line. */
size_t i;
char **r;
- if (g->cmdline == NULL) {
- r = safe_malloc (g, sizeof (char *) * 1);
- r[0] = NULL;
- return r;
- }
+ alloc_cmdline (g);
r = safe_malloc (g, sizeof (char *) * (g->cmdline_size + 1));
r[0] = safe_strdup (g, g->qemu); /* g->cmdline[0] is always NULL */
return r; /* caller frees */
}
+/* Internal command to return the list of drives. */
+char **
+guestfs__debug_drives (guestfs_h *g)
+{
+ size_t i, count;
+ char **ret;
+ struct drive *drv;
+
+ for (count = 0, drv = g->drives; drv; count++, drv = drv->next)
+ ;
+
+ ret = safe_malloc (g, sizeof (char *) * (count + 1));
+
+ for (i = 0, drv = g->drives; drv; i++, drv = drv->next)
+ ret[i] = qemu_drive_param (g, drv);
+
+ ret[count] = NULL;
+
+ return ret; /* caller frees */
+}
+
int
guestfs__config (guestfs_h *g,
const char *qemu_param, const char *qemu_value)
* O_DIRECT. This fails on some filesystem types (notably tmpfs).
* So we check if we can open the file with or without O_DIRECT,
* and use cache=off (or not) accordingly.
+ *
+ * NB: This function is only called on the !readonly path. We must
+ * try to open with O_RDWR to test that the file is readable and
+ * writable here.
*/
static int
test_cache_off (guestfs_h *g, const char *filename)
{
- int fd = open (filename, O_RDONLY|O_DIRECT);
+ int fd = open (filename, O_RDWR|O_DIRECT);
if (fd >= 0) {
close (fd);
return 1;
}
- fd = open (filename, O_RDONLY);
+ fd = open (filename, O_RDWR);
if (fd >= 0) {
close (fd);
return 0;
const struct guestfs_add_drive_opts_argv *optargs)
{
int readonly;
- const char *format;
- const char *iface;
+ char *format;
+ char *iface;
+ char *name;
+ int use_cache_off;
if (strchr (filename, ',') != NULL) {
error (g, _("filename cannot contain ',' (comma) character"));
readonly = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_READONLY_BITMASK
? optargs->readonly : 0;
format = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_FORMAT_BITMASK
- ? optargs->format : NULL;
+ ? safe_strdup (g, optargs->format) : NULL;
iface = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_IFACE_BITMASK
- ? optargs->iface : DRIVE_IF;
+ ? safe_strdup (g, optargs->iface) : safe_strdup (g, DRIVE_IF);
+ name = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_NAME_BITMASK
+ ? safe_strdup (g, optargs->name) : NULL;
if (format && !valid_format_iface (format)) {
error (g, _("%s parameter is empty or contains disallowed characters"),
"format");
+ free (format);
+ free (iface);
+ free (name);
return -1;
}
if (!valid_format_iface (iface)) {
error (g, _("%s parameter is empty or contains disallowed characters"),
"iface");
+ free (format);
+ free (iface);
+ free (name);
return -1;
}
* checks for the existence of the file. For readonly we have
* to do the check explicitly.
*/
- int use_cache_off = readonly ? 0 : test_cache_off (g, filename);
- if (use_cache_off == -1)
+ use_cache_off = readonly ? 0 : test_cache_off (g, filename);
+ if (use_cache_off == -1) {
+ free (format);
+ free (iface);
+ free (name);
return -1;
+ }
if (readonly) {
- if (access (filename, F_OK) == -1) {
+ if (access (filename, R_OK) == -1) {
perrorf (g, "%s", filename);
+ free (format);
+ free (iface);
+ free (name);
return -1;
}
}
- /* Construct the final -drive parameter. */
- size_t len = 64 + strlen (filename) + strlen (iface);
- if (format) len += strlen (format);
- char buf[len];
+ struct drive **i = &(g->drives);
+ while (*i != NULL) i = &((*i)->next);
- snprintf (buf, len, "file=%s%s%s%s%s,if=%s",
- filename,
- readonly ? ",snapshot=on" : "",
- use_cache_off ? ",cache=off" : "",
- format ? ",format=" : "",
- format ? format : "",
- iface);
+ *i = safe_malloc (g, sizeof (struct drive));
+ (*i)->next = NULL;
+ (*i)->path = safe_strdup (g, filename);
+ (*i)->readonly = readonly;
+ (*i)->format = format;
+ (*i)->iface = iface;
+ (*i)->name = name;
+ (*i)->use_cache_off = use_cache_off;
- return guestfs__config (g, "-drive", buf);
+ return 0;
}
int
return -1;
}
+ TRACE0 (launch_start);
+
/* Make the temporary directory. */
if (!g->tmpdir) {
TMP_TEMPLATE_ON_STACK (dir_template);
/* At present you must add drives before starting the appliance. In
* future when we enable hotplugging you won't need to do this.
*/
- if (!g->cmdline) {
+ if (!g->drives) {
error (g, _("you must call guestfs_add_drive before guestfs_launch"));
return -1;
}
gettimeofday (&g->launch_t, NULL);
guestfs___launch_send_progress (g, 0);
+ TRACE0 (launch_build_appliance_start);
+
/* Locate and/or build the appliance. */
char *kernel = NULL, *initrd = NULL, *appliance = NULL;
if (guestfs___build_appliance (g, &kernel, &initrd, &appliance) == -1)
return -1;
+ TRACE0 (launch_build_appliance_end);
+
guestfs___launch_send_progress (g, 3);
if (g->verbose)
/* Set up the full command line. Do this in the subprocess so we
* don't need to worry about cleaning up.
*/
+
+ /* Set g->cmdline[0] to the name of the qemu process. However
+ * it is possible that no g->cmdline has been allocated yet so
+ * we must do that first.
+ */
+ alloc_cmdline (g);
g->cmdline[0] = g->qemu;
+ /* Add drives */
+ struct drive *drv = g->drives;
+ while (drv != NULL) {
+ /* Construct the final -drive parameter. */
+ char *buf = qemu_drive_param (g, drv);
+
+ add_cmdline (g, "-drive");
+ add_cmdline (g, buf);
+ free (buf);
+
+ drv = drv->next;
+ }
+
if (qemu_supports (g, "-nodefconfig"))
add_cmdline (g, "-nodefconfig");
*/
if (qemu_supports (g, "-machine")) {
add_cmdline (g, "-machine");
+#if QEMU_MACHINE_TYPE_IS_BROKEN
+ /* Workaround for qemu 0.15: We have to add the '[type=]pc'
+ * since there is no default. This is not a permanent solution
+ * because this only works on PC-like hardware. Other platforms
+ * like ppc would need a different machine type.
+ *
+ * This bug is fixed in qemu commit 2645c6dcaf6ea2a51a, and was
+ * not a problem in qemu < 0.15.
+ */
+ add_cmdline (g, "pc,accel=kvm:tcg");
+#else
add_cmdline (g, "accel=kvm:tcg");
+#endif
} else {
/* qemu sometimes needs this option to enable hardware
* virtualization, but some versions of 'qemu-kvm' will use KVM
add_cmdline (g, "-nographic");
+ if (g->smp > 1) {
+ snprintf (buf, sizeof buf, "%d", g->smp);
+ add_cmdline (g, "-smp");
+ add_cmdline (g, buf);
+ }
+
snprintf (buf, sizeof buf, "%d", g->memsize);
add_cmdline (g, "-m");
add_cmdline (g, buf);
"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 */ \
+ "no_timer_check " /* fix for RHBZ#502058 */ \
"acpi=off " /* we don't need ACPI, turn it off */ \
"printk.time=1 " /* display timestamp before kernel messages */ \
"cgroup_disable=memory " /* saves us about 5 MB of RAM */
incr_cmdline_size (g);
g->cmdline[g->cmdline_size-1] = NULL;
- if (g->verbose)
- guestfs___print_timestamped_argv (g, (const char **)g->cmdline);
-
if (!g->direct) {
- /* Set up stdin, stdout. */
+ /* Set up stdin, stdout, stderr. */
close (0);
close (1);
close (wfd[1]);
close (rfd[0]);
+ /* Stdin. */
if (dup (wfd[0]) == -1) {
dup_failed:
perror ("dup failed");
_exit (EXIT_FAILURE);
}
+ /* Stdout. */
+ if (dup (rfd[1]) == -1)
+ goto dup_failed;
+
+ /* Particularly since qemu 0.15, qemu spews all sorts of debug
+ * information on stderr. It is useful to both capture this and
+ * not confuse casual users, so send stderr to the pipe as well.
+ */
+ close (2);
if (dup (rfd[1]) == -1)
goto dup_failed;
close (rfd[1]);
}
+ /* Dump the command line (after setting up stderr above). */
+ if (g->verbose)
+ print_qemu_command_line (g, g->cmdline);
+
/* Put qemu in a new process group. */
if (g->pgroup)
setpgid (0, 0);
setenv ("LC_ALL", "C", 1);
+ TRACE0 (launch_run_qemu);
+
execv (g->qemu, g->cmdline); /* Run qemu. */
perror (g->qemu);
_exit (EXIT_FAILURE);
setpgid (0, 0);
/* 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
+ * http://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/misc/ps_status.c;hb=HEAD
*/
/* Loop around waiting for one or both of the other processes to
if (r == -1)
goto cleanup1;
+ /* NB: We reach here just because qemu has opened the socket. It
+ * does not mean the daemon is up until we read the
+ * GUESTFS_LAUNCH_FLAG below. Failures in qemu startup can still
+ * happen even if we reach here, even early failures like not being
+ * able to open a drive.
+ */
+
close (g->sock); /* Close the listening socket. */
g->sock = r; /* This is the accepted data socket. */
goto cleanup1;
}
+ TRACE0 (launch_end);
+
guestfs___launch_send_progress (g, 12);
return 0;
return msec;
}
-void
-guestfs___print_timestamped_argv (guestfs_h *g, const char * argv[])
-{
- int i = 0;
- int needs_quote;
- char *buf = NULL;
- size_t len;
- FILE *fp;
-
- fp = open_memstream (&buf, &len);
- if (fp == NULL) {
- warning (g, "open_memstream: %m");
- return;
- }
-
- struct timeval tv;
- gettimeofday (&tv, NULL);
- fprintf (fp, "[%05" PRIi64 "ms] ", timeval_diff (&g->launch_t, &tv));
-
- while (argv[i]) {
- if (argv[i][0] == '-') /* -option starts a new line */
- fprintf (fp, " \\\n ");
-
- if (i > 0) fputc (' ', fp);
-
- /* Does it need shell quoting? This only deals with simple cases. */
- needs_quote = strcspn (argv[i], " ") != strlen (argv[i]);
-
- if (needs_quote) fputc ('\'', fp);
- fprintf (fp, "%s", argv[i]);
- if (needs_quote) fputc ('\'', fp);
- i++;
- }
-
- fclose (fp);
-
- debug (g, "%s", buf);
-
- free (buf);
-}
-
+/* Note that since this calls 'debug' it should only be called
+ * from the parent process.
+ */
void
guestfs___print_timestamped_message (guestfs_h *g, const char *fs, ...)
{
free (msg);
}
+/* This is called from the forked subprocess just before qemu runs, so
+ * it can just print the message straight to stderr, where it will be
+ * picked up and funnelled through the usual appliance event API.
+ */
+static void
+print_qemu_command_line (guestfs_h *g, char **argv)
+{
+ int i = 0;
+ int needs_quote;
+
+ struct timeval tv;
+ gettimeofday (&tv, NULL);
+ fprintf (stderr, "[%05" PRIi64 "ms] ", timeval_diff (&g->launch_t, &tv));
+
+ while (argv[i]) {
+ if (argv[i][0] == '-') /* -option starts a new line */
+ fprintf (stderr, " \\\n ");
+
+ if (i > 0) fputc (' ', stderr);
+
+ /* Does it need shell quoting? This only deals with simple cases. */
+ needs_quote = strcspn (argv[i], " ") != strlen (argv[i]);
+
+ if (needs_quote) fputc ('\'', stderr);
+ fprintf (stderr, "%s", argv[i]);
+ if (needs_quote) fputc ('\'', stderr);
+ i++;
+ }
+}
+
+static int test_qemu_cmd (guestfs_h *g, const char *cmd, char **ret);
static int read_all (guestfs_h *g, FILE *fp, char **ret);
/* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
char cmd[1024];
FILE *fp;
+ free (g->qemu_help);
+ g->qemu_help = NULL;
+ free (g->qemu_version);
+ g->qemu_version = NULL;
+
snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -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);
+ if (test_qemu_cmd (g, cmd, &g->qemu_help) == -1) {
+ error (g, _("command failed: %s\n\nIf qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU\nenvironment variable. There may also be errors printed above."),
+ cmd);
return -1;
}
- if (read_all (g, fp, &g->qemu_help) == -1)
- goto error;
-
- if (pclose (fp) == -1)
- goto error;
-
snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
g->qemu);
+ /* Intentionally ignore errors from qemu -version. */
+ ignore_value (test_qemu_cmd (g, cmd, &g->qemu_version));
+
+ return 0;
+}
+
+static int
+test_qemu_cmd (guestfs_h *g, const char *cmd, char **ret)
+{
+ FILE *fp;
+
fp = popen (cmd, "r");
- if (fp) {
- /* Intentionally ignore errors. */
- read_all (g, fp, &g->qemu_version);
+ if (fp == NULL)
+ return -1;
+
+ if (read_all (g, fp, ret) == -1) {
pclose (fp);
+ return -1;
}
+ if (pclose (fp) != 0)
+ return -1;
+
return 0;
}
return strstr (g->qemu_help, option) != NULL;
}
+#if 0
+/* As above but using a regex instead of a fixed string. */
+static int
+qemu_supports_re (guestfs_h *g, const pcre *option_regex)
+{
+ if (!g->qemu_help) {
+ if (test_qemu (g) == -1)
+ return -1;
+ }
+
+ return match (g, g->qemu_help, option_regex);
+}
+#endif
+
/* Check if a file can be opened. */
static int
is_openable (guestfs_h *g, const char *path, int flags)
return 1;
}
+static char *
+qemu_drive_param (guestfs_h *g, const struct drive *drv)
+{
+ size_t len = 64;
+ char *r;
+
+ len += strlen (drv->path);
+ len += strlen (drv->iface);
+ if (drv->format)
+ len += strlen (drv->format);
+
+ r = safe_malloc (g, len);
+
+ snprintf (r, len, "file=%s%s%s%s%s,if=%s",
+ drv->path,
+ drv->readonly ? ",snapshot=on" : "",
+ drv->use_cache_off ? ",cache=off" : "",
+ drv->format ? ",format=" : "",
+ drv->format ? drv->format : "",
+ drv->iface);
+
+ return r; /* caller frees */
+}
+
/* You had to call this function after launch in versions <= 1.0.70,
* but it is now a no-op.
*/
git.annexia.org / libguestfs.git / blobdiff