2 * Copyright (C) 2009-2011 Red Hat Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 #define _BSD_SOURCE /* for mkdtemp, usleep */
34 #include <sys/select.h>
39 #include <rpc/types.h>
46 #ifdef HAVE_SYS_TYPES_H
47 #include <sys/types.h>
50 #ifdef HAVE_SYS_WAIT_H
54 #ifdef HAVE_SYS_SOCKET_H
55 #include <sys/socket.h>
62 #include <arpa/inet.h>
63 #include <netinet/in.h>
66 #include "glthread/lock.h"
69 #include "guestfs-internal.h"
70 #include "guestfs-internal-actions.h"
71 #include "guestfs_protocol.h"
73 static int launch_appliance (guestfs_h *g);
74 static int64_t timeval_diff (const struct timeval *x, const struct timeval *y);
75 static int connect_unix_socket (guestfs_h *g, const char *sock);
76 static int qemu_supports (guestfs_h *g, const char *option);
78 /* Add a string to the current command line. */
80 incr_cmdline_size (guestfs_h *g)
82 if (g->cmdline == NULL) {
83 /* g->cmdline[0] is reserved for argv[0], set in guestfs_launch. */
85 g->cmdline = safe_malloc (g, sizeof (char *));
90 g->cmdline = safe_realloc (g, g->cmdline, sizeof (char *) * g->cmdline_size);
94 add_cmdline (guestfs_h *g, const char *str)
96 if (g->state != CONFIG) {
98 _("command line cannot be altered after qemu subprocess launched"));
102 incr_cmdline_size (g);
103 g->cmdline[g->cmdline_size-1] = safe_strdup (g, str);
108 guestfs___checkpoint_cmdline (guestfs_h *g)
110 return g->cmdline_size;
114 guestfs___rollback_cmdline (guestfs_h *g, size_t pos)
118 assert (g->cmdline_size >= pos);
120 for (i = g->cmdline_size - 1; i >= pos; --i)
121 free (g->cmdline[i]);
123 g->cmdline_size = pos;
126 /* Internal command to return the command line. */
128 guestfs__debug_cmdline (guestfs_h *g)
133 if (g->cmdline == NULL) {
134 r = safe_malloc (g, sizeof (char *) * 1);
139 r = safe_malloc (g, sizeof (char *) * (g->cmdline_size + 1));
140 r[0] = safe_strdup (g, g->qemu); /* g->cmdline[0] is always NULL */
142 for (i = 1; i < g->cmdline_size; ++i)
143 r[i] = safe_strdup (g, g->cmdline[i]);
145 r[g->cmdline_size] = NULL;
147 return r; /* caller frees */
151 guestfs__config (guestfs_h *g,
152 const char *qemu_param, const char *qemu_value)
154 if (qemu_param[0] != '-') {
155 error (g, _("guestfs_config: parameter must begin with '-' character"));
159 /* A bit fascist, but the user will probably break the extra
160 * parameters that we add if they try to set any of these.
162 if (STREQ (qemu_param, "-kernel") ||
163 STREQ (qemu_param, "-initrd") ||
164 STREQ (qemu_param, "-nographic") ||
165 STREQ (qemu_param, "-serial") ||
166 STREQ (qemu_param, "-full-screen") ||
167 STREQ (qemu_param, "-std-vga") ||
168 STREQ (qemu_param, "-vnc")) {
169 error (g, _("guestfs_config: parameter '%s' isn't allowed"), qemu_param);
173 if (add_cmdline (g, qemu_param) != 0) return -1;
175 if (qemu_value != NULL) {
176 if (add_cmdline (g, qemu_value) != 0) return -1;
182 /* cache=off improves reliability in the event of a host crash.
184 * However this option causes qemu to try to open the file with
185 * O_DIRECT. This fails on some filesystem types (notably tmpfs).
186 * So we check if we can open the file with or without O_DIRECT,
187 * and use cache=off (or not) accordingly.
190 test_cache_off (guestfs_h *g, const char *filename)
192 int fd = open (filename, O_RDONLY|O_DIRECT);
198 fd = open (filename, O_RDONLY);
204 perrorf (g, "%s", filename);
208 /* Check string parameter matches ^[-_[:alnum:]]+$ (in C locale). */
210 valid_format_iface (const char *str)
212 size_t len = strlen (str);
220 if (c != '-' && c != '_' && !c_isalnum (c))
227 guestfs__add_drive_opts (guestfs_h *g, const char *filename,
228 const struct guestfs_add_drive_opts_argv *optargs)
234 if (strchr (filename, ',') != NULL) {
235 error (g, _("filename cannot contain ',' (comma) character"));
239 readonly = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_READONLY_BITMASK
240 ? optargs->readonly : 0;
241 format = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_FORMAT_BITMASK
242 ? optargs->format : NULL;
243 iface = optargs->bitmask & GUESTFS_ADD_DRIVE_OPTS_IFACE_BITMASK
244 ? optargs->iface : DRIVE_IF;
246 if (format && !valid_format_iface (format)) {
247 error (g, _("%s parameter is empty or contains disallowed characters"),
251 if (!valid_format_iface (iface)) {
252 error (g, _("%s parameter is empty or contains disallowed characters"),
257 /* For writable files, see if we can use cache=off. This also
258 * checks for the existence of the file. For readonly we have
259 * to do the check explicitly.
261 int use_cache_off = readonly ? 0 : test_cache_off (g, filename);
262 if (use_cache_off == -1)
266 if (access (filename, F_OK) == -1) {
267 perrorf (g, "%s", filename);
272 /* Construct the final -drive parameter. */
273 size_t len = 64 + strlen (filename) + strlen (iface);
274 if (format) len += strlen (format);
277 snprintf (buf, len, "file=%s%s%s%s%s,if=%s",
279 readonly ? ",snapshot=on" : "",
280 use_cache_off ? ",cache=off" : "",
281 format ? ",format=" : "",
282 format ? format : "",
285 return guestfs__config (g, "-drive", buf);
289 guestfs__add_drive (guestfs_h *g, const char *filename)
291 struct guestfs_add_drive_opts_argv optargs = {
295 return guestfs__add_drive_opts (g, filename, &optargs);
299 guestfs__add_drive_ro (guestfs_h *g, const char *filename)
301 struct guestfs_add_drive_opts_argv optargs = {
302 .bitmask = GUESTFS_ADD_DRIVE_OPTS_READONLY_BITMASK,
306 return guestfs__add_drive_opts (g, filename, &optargs);
310 guestfs__add_drive_with_if (guestfs_h *g, const char *filename,
313 struct guestfs_add_drive_opts_argv optargs = {
314 .bitmask = GUESTFS_ADD_DRIVE_OPTS_IFACE_BITMASK,
318 return guestfs__add_drive_opts (g, filename, &optargs);
322 guestfs__add_drive_ro_with_if (guestfs_h *g, const char *filename,
325 struct guestfs_add_drive_opts_argv optargs = {
326 .bitmask = GUESTFS_ADD_DRIVE_OPTS_IFACE_BITMASK
327 | GUESTFS_ADD_DRIVE_OPTS_READONLY_BITMASK,
332 return guestfs__add_drive_opts (g, filename, &optargs);
336 guestfs__add_cdrom (guestfs_h *g, const char *filename)
338 if (strchr (filename, ',') != NULL) {
339 error (g, _("filename cannot contain ',' (comma) character"));
343 if (access (filename, F_OK) == -1) {
344 perrorf (g, "%s", filename);
348 return guestfs__config (g, "-cdrom", filename);
351 static int is_openable (guestfs_h *g, const char *path, int flags);
354 guestfs__launch (guestfs_h *g)
357 if (g->state != CONFIG) {
358 error (g, _("the libguestfs handle has already been launched"));
362 /* Make the temporary directory. */
364 TMP_TEMPLATE_ON_STACK (dir_template);
365 g->tmpdir = safe_strdup (g, dir_template);
366 if (mkdtemp (g->tmpdir) == NULL) {
367 perrorf (g, _("%s: cannot create temporary directory"), dir_template);
372 /* Allow anyone to read the temporary directory. The socket in this
373 * directory won't be readable but anyone can see it exists if they
374 * want. (RHBZ#610880).
376 if (chmod (g->tmpdir, 0755) == -1)
377 warning (g, "chmod: %s: %m (ignored)", g->tmpdir);
379 /* Launch the appliance or attach to an existing daemon. */
380 switch (g->attach_method) {
381 case ATTACH_METHOD_APPLIANCE:
382 return launch_appliance (g);
384 case ATTACH_METHOD_UNIX:
385 return connect_unix_socket (g, g->attach_method_arg);
393 launch_appliance (guestfs_h *g)
397 char guestfsd_sock[256];
398 struct sockaddr_un addr;
400 /* At present you must add drives before starting the appliance. In
401 * future when we enable hotplugging you won't need to do this.
404 error (g, _("you must call guestfs_add_drive before guestfs_launch"));
408 /* Start the clock ... */
409 gettimeofday (&g->launch_t, NULL);
410 guestfs___launch_send_progress (g, 0);
412 /* Locate and/or build the appliance. */
413 char *kernel = NULL, *initrd = NULL, *appliance = NULL;
414 if (guestfs___build_appliance (g, &kernel, &initrd, &appliance) == -1)
417 guestfs___launch_send_progress (g, 3);
420 guestfs___print_timestamped_message (g, "begin testing qemu features");
422 /* Get qemu help text and version. */
423 if (qemu_supports (g, NULL) == -1)
426 /* Using virtio-serial, we need to create a local Unix domain socket
427 * for qemu to connect to.
429 snprintf (guestfsd_sock, sizeof guestfsd_sock, "%s/guestfsd.sock", g->tmpdir);
430 unlink (guestfsd_sock);
432 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
434 perrorf (g, "socket");
438 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
439 perrorf (g, "fcntl");
443 addr.sun_family = AF_UNIX;
444 strncpy (addr.sun_path, guestfsd_sock, UNIX_PATH_MAX);
445 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
447 if (bind (g->sock, &addr, sizeof addr) == -1) {
452 if (listen (g->sock, 1) == -1) {
453 perrorf (g, "listen");
458 if (pipe (wfd) == -1 || pipe (rfd) == -1) {
465 guestfs___print_timestamped_message (g, "finished testing qemu features");
479 if (r == 0) { /* Child (qemu). */
482 /* Set up the full command line. Do this in the subprocess so we
483 * don't need to worry about cleaning up.
485 g->cmdline[0] = g->qemu;
487 if (qemu_supports (g, "-nodefconfig"))
488 add_cmdline (g, "-nodefconfig");
490 /* qemu sometimes needs this option to enable hardware
491 * virtualization, but some versions of 'qemu-kvm' will use KVM
492 * regardless (even where this option appears in the help text).
493 * It is rumoured that there are versions of qemu where supplying
494 * this option when hardware virtualization is not available will
495 * cause qemu to fail, so we we have to check at least that
496 * /dev/kvm is openable. That's not reliable, since /dev/kvm
497 * might be openable by qemu but not by us (think: SELinux) in
498 * which case the user would not get hardware virtualization,
499 * although at least shouldn't fail. A giant clusterfuck with the
500 * qemu command line, again.
502 if (qemu_supports (g, "-enable-kvm") &&
503 is_openable (g, "/dev/kvm", O_RDWR))
504 add_cmdline (g, "-enable-kvm");
506 /* Newer versions of qemu (from around 2009/12) changed the
507 * behaviour of monitors so that an implicit '-monitor stdio' is
508 * assumed if we are in -nographic mode and there is no other
509 * -monitor option. Only a single stdio device is allowed, so
510 * this broke the '-serial stdio' option. There is a new flag
511 * called -nodefaults which gets rid of all this default crud, so
512 * let's use that to avoid this and any future surprises.
514 if (qemu_supports (g, "-nodefaults"))
515 add_cmdline (g, "-nodefaults");
517 add_cmdline (g, "-nographic");
519 snprintf (buf, sizeof buf, "%d", g->memsize);
520 add_cmdline (g, "-m");
521 add_cmdline (g, buf);
523 /* Force exit instead of reboot on panic */
524 add_cmdline (g, "-no-reboot");
526 /* These options recommended by KVM developers to improve reliability. */
527 if (qemu_supports (g, "-no-hpet"))
528 add_cmdline (g, "-no-hpet");
530 if (qemu_supports (g, "-rtc-td-hack"))
531 add_cmdline (g, "-rtc-td-hack");
533 /* Create the virtio serial bus. */
534 add_cmdline (g, "-device");
535 add_cmdline (g, "virtio-serial");
538 /* Use virtio-console (a variant form of virtio-serial) for the
539 * guest's serial console.
541 add_cmdline (g, "-chardev");
542 add_cmdline (g, "stdio,id=console");
543 add_cmdline (g, "-device");
544 add_cmdline (g, "virtconsole,chardev=console,name=org.libguestfs.console.0");
546 /* When the above works ... until then: */
547 add_cmdline (g, "-serial");
548 add_cmdline (g, "stdio");
551 /* Set up virtio-serial for the communications channel. */
552 add_cmdline (g, "-chardev");
553 snprintf (buf, sizeof buf, "socket,path=%s,id=channel0", guestfsd_sock);
554 add_cmdline (g, buf);
555 add_cmdline (g, "-device");
556 add_cmdline (g, "virtserialport,chardev=channel0,name=org.libguestfs.channel.0");
558 /* Enable user networking. */
559 if (g->enable_network) {
560 add_cmdline (g, "-netdev");
561 add_cmdline (g, "user,id=usernet,net=169.254.0.0/16");
562 add_cmdline (g, "-device");
563 add_cmdline (g, NET_IF ",netdev=usernet");
566 #define LINUX_CMDLINE \
567 "panic=1 " /* force kernel to panic if daemon exits */ \
568 "console=ttyS0 " /* serial console */ \
569 "udevtimeout=300 " /* good for very slow systems (RHBZ#480319) */ \
570 "noapic " /* workaround for RHBZ#502058 - ok if not SMP */ \
571 "acpi=off " /* we don't need ACPI, turn it off */ \
572 "printk.time=1 " /* display timestamp before kernel messages */ \
573 "cgroup_disable=memory " /* saves us about 5 MB of RAM */
575 /* Linux kernel command line. */
576 snprintf (buf, sizeof buf,
578 "%s " /* (selinux) */
579 "%s " /* (verbose) */
580 "TERM=%s " /* (TERM environment variable) */
582 g->selinux ? "selinux=1 enforcing=0" : "selinux=0",
583 g->verbose ? "guestfs_verbose=1" : "",
584 getenv ("TERM") ? : "linux",
585 g->append ? g->append : "");
587 add_cmdline (g, "-kernel");
588 add_cmdline (g, kernel);
589 add_cmdline (g, "-initrd");
590 add_cmdline (g, initrd);
591 add_cmdline (g, "-append");
592 add_cmdline (g, buf);
594 /* Add the ext2 appliance drive (last of all). */
596 const char *cachemode = "";
597 if (qemu_supports (g, "cache=")) {
598 if (qemu_supports (g, "unsafe"))
599 cachemode = ",cache=unsafe";
600 else if (qemu_supports (g, "writeback"))
601 cachemode = ",cache=writeback";
604 char buf2[PATH_MAX + 64];
605 add_cmdline (g, "-drive");
606 snprintf (buf2, sizeof buf2, "file=%s,snapshot=on,if=" DRIVE_IF "%s",
607 appliance, cachemode);
608 add_cmdline (g, buf2);
611 /* Finish off the command line. */
612 incr_cmdline_size (g);
613 g->cmdline[g->cmdline_size-1] = NULL;
616 guestfs___print_timestamped_argv (g, (const char **)g->cmdline);
619 /* Set up stdin, stdout. */
625 if (dup (wfd[0]) == -1) {
627 perror ("dup failed");
628 _exit (EXIT_FAILURE);
630 if (dup (rfd[1]) == -1)
638 /* Set up a new process group, so we can signal this process
639 * and all subprocesses (eg. if qemu is really a shell script).
644 setenv ("LC_ALL", "C", 1);
646 execv (g->qemu, g->cmdline); /* Run qemu. */
648 _exit (EXIT_FAILURE);
651 /* Parent (library). */
661 /* Fork the recovery process off which will kill qemu if the parent
662 * process fails to do so (eg. if the parent segfaults).
665 if (g->recovery_proc) {
668 pid_t qemu_pid = g->pid;
669 pid_t parent_pid = getppid ();
671 /* Writing to argv is hideously complicated and error prone. See:
672 * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
675 /* Loop around waiting for one or both of the other processes to
676 * disappear. It's fair to say this is very hairy. The PIDs that
677 * we are looking at might be reused by another process. We are
678 * effectively polling. Is the cure worse than the disease?
681 if (kill (qemu_pid, 0) == -1) /* qemu's gone away, we aren't needed */
682 _exit (EXIT_SUCCESS);
683 if (kill (parent_pid, 0) == -1) {
684 /* Parent's gone away, qemu still around, so kill qemu. */
686 _exit (EXIT_SUCCESS);
692 /* Don't worry, if the fork failed, this will be -1. The recovery
693 * process isn't essential.
699 /* Close the other ends of the pipe. */
703 if (fcntl (wfd[1], F_SETFL, O_NONBLOCK) == -1 ||
704 fcntl (rfd[0], F_SETFL, O_NONBLOCK) == -1) {
705 perrorf (g, "fcntl");
709 g->fd[0] = wfd[1]; /* stdin of child */
710 g->fd[1] = rfd[0]; /* stdout of child */
712 g->fd[0] = open ("/dev/null", O_RDWR);
713 if (g->fd[0] == -1) {
714 perrorf (g, "open /dev/null");
717 g->fd[1] = dup (g->fd[0]);
718 if (g->fd[1] == -1) {
725 g->state = LAUNCHING;
727 /* Wait for qemu to start and to connect back to us via
728 * virtio-serial and send the GUESTFS_LAUNCH_FLAG message.
730 r = guestfs___accept_from_daemon (g);
734 close (g->sock); /* Close the listening socket. */
735 g->sock = r; /* This is the accepted data socket. */
737 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
738 perrorf (g, "fcntl");
744 r = guestfs___recv_from_daemon (g, &size, &buf);
747 if (r == -1) return -1;
749 if (size != GUESTFS_LAUNCH_FLAG) {
750 error (g, _("guestfs_launch failed, see earlier error messages"));
755 guestfs___print_timestamped_message (g, "appliance is up");
757 /* This is possible in some really strange situations, such as
758 * guestfsd starts up OK but then qemu immediately exits. Check for
759 * it because the caller is probably expecting to be able to send
760 * commands after this function returns.
762 if (g->state != READY) {
763 error (g, _("qemu launched and contacted daemon, but state != READY"));
767 guestfs___launch_send_progress (g, 12);
776 if (g->pid > 0) kill (g->pid, 9);
777 if (g->recoverypid > 0) kill (g->recoverypid, 9);
778 if (g->pid > 0) waitpid (g->pid, NULL, 0);
779 if (g->recoverypid > 0) waitpid (g->recoverypid, NULL, 0);
784 memset (&g->launch_t, 0, sizeof g->launch_t);
798 /* Alternate attach method: instead of launching the appliance,
799 * connect to an existing unix socket.
802 connect_unix_socket (guestfs_h *g, const char *sockpath)
805 struct sockaddr_un addr;
807 /* Start the clock ... */
808 gettimeofday (&g->launch_t, NULL);
810 /* Set these to nothing so we don't try to kill random processes or
811 * read from random file descriptors.
819 guestfs___print_timestamped_message (g, "connecting to %s", sockpath);
821 g->sock = socket (AF_UNIX, SOCK_STREAM, 0);
823 perrorf (g, "socket");
827 addr.sun_family = AF_UNIX;
828 strncpy (addr.sun_path, sockpath, UNIX_PATH_MAX);
829 addr.sun_path[UNIX_PATH_MAX-1] = '\0';
831 g->state = LAUNCHING;
833 if (connect (g->sock, &addr, sizeof addr) == -1) {
838 if (fcntl (g->sock, F_SETFL, O_NONBLOCK) == -1) {
839 perrorf (g, "fcntl");
845 r = guestfs___recv_from_daemon (g, &size, &buf);
848 if (r == -1) return -1;
850 if (size != GUESTFS_LAUNCH_FLAG) {
851 error (g, _("guestfs_launch failed, unexpected initial message from guestfsd"));
856 guestfs___print_timestamped_message (g, "connected");
858 if (g->state != READY) {
859 error (g, _("contacted guestfsd, but state != READY"));
870 /* launch (of the ordinary appliance) generates approximate progress
871 * messages. Currently these are defined as follows:
873 * 0 / 12: launch clock starts
874 * 3 / 12: appliance created
875 * 6 / 12: detected that guest kernel started
876 * 9 / 12: detected that /init script is running
877 * 12 / 12: launch completed successfully
880 * (1) This is not a documented ABI and the behaviour may be changed
881 * or removed in future.
882 * (2) Messages are only sent if more than 5 seconds has elapsed
883 * since the launch clock started.
884 * (3) There is a gross hack in proto.c to make this work.
887 guestfs___launch_send_progress (guestfs_h *g, int perdozen)
891 gettimeofday (&tv, NULL);
892 if (timeval_diff (&g->launch_t, &tv) >= 5000) {
893 guestfs_progress progress_message =
894 { .proc = 0, .serial = 0, .position = perdozen, .total = 12 };
896 guestfs___progress_message_callback (g, &progress_message);
900 /* Return the location of the tmpdir (eg. "/tmp") and allow users
901 * to override it at runtime using $TMPDIR.
902 * http://www.pathname.com/fhs/pub/fhs-2.3.html#TMPTEMPORARYFILES
905 guestfs_tmpdir (void)
915 const char *t = getenv ("TMPDIR");
921 /* Return the location of the persistent tmpdir (eg. "/var/tmp") and
922 * allow users to override it at runtime using $TMPDIR.
923 * http://www.pathname.com/fhs/pub/fhs-2.3.html#VARTMPTEMPORARYFILESPRESERVEDBETWEE
926 guestfs___persistent_tmpdir (void)
932 const char *t = getenv ("TMPDIR");
938 /* Compute Y - X and return the result in milliseconds.
939 * Approximately the same as this code:
940 * http://www.mpp.mpg.de/~huber/util/timevaldiff.c
943 timeval_diff (const struct timeval *x, const struct timeval *y)
947 msec = (y->tv_sec - x->tv_sec) * 1000;
948 msec += (y->tv_usec - x->tv_usec) / 1000;
953 guestfs___print_timestamped_argv (guestfs_h *g, const char * argv[])
961 fp = open_memstream (&buf, &len);
963 warning (g, "open_memstream: %m");
968 gettimeofday (&tv, NULL);
969 fprintf (fp, "[%05" PRIi64 "ms] ", timeval_diff (&g->launch_t, &tv));
972 if (argv[i][0] == '-') /* -option starts a new line */
973 fprintf (fp, " \\\n ");
975 if (i > 0) fputc (' ', fp);
977 /* Does it need shell quoting? This only deals with simple cases. */
978 needs_quote = strcspn (argv[i], " ") != strlen (argv[i]);
980 if (needs_quote) fputc ('\'', fp);
981 fprintf (fp, "%s", argv[i]);
982 if (needs_quote) fputc ('\'', fp);
988 debug (g, "%s", buf);
994 guestfs___print_timestamped_message (guestfs_h *g, const char *fs, ...)
1001 va_start (args, fs);
1002 err = vasprintf (&msg, fs, args);
1005 if (err < 0) return;
1007 gettimeofday (&tv, NULL);
1009 debug (g, "[%05" PRIi64 "ms] %s", timeval_diff (&g->launch_t, &tv), msg);
1014 static int read_all (guestfs_h *g, FILE *fp, char **ret);
1016 /* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
1017 * 'qemu -version' so we know what options this qemu supports and
1021 test_qemu (guestfs_h *g)
1026 snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -help", g->qemu);
1028 fp = popen (cmd, "r");
1029 /* qemu -help should always work (qemu -version OTOH wasn't
1030 * supported by qemu 0.9). If this command doesn't work then it
1031 * probably indicates that the qemu binary is missing.
1034 /* XXX This error is never printed, even if the qemu binary
1035 * doesn't exist. Why?
1038 perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
1042 if (read_all (g, fp, &g->qemu_help) == -1)
1045 if (pclose (fp) == -1)
1048 snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
1051 fp = popen (cmd, "r");
1053 /* Intentionally ignore errors. */
1054 read_all (g, fp, &g->qemu_version);
1062 read_all (guestfs_h *g, FILE *fp, char **ret)
1069 *ret = safe_realloc (g, *ret, n + 1);
1074 *ret = safe_realloc (g, *ret, n + BUFSIZ);
1076 r = fread (p, 1, BUFSIZ, fp);
1078 perrorf (g, "read");
1085 /* Test if option is supported by qemu command line (just by grepping
1088 * The first time this is used, it has to run the external qemu
1089 * binary. If that fails, it returns -1.
1091 * To just do the first-time run of the qemu binary, call this with
1092 * option == NULL, in which case it will return -1 if there was an
1096 qemu_supports (guestfs_h *g, const char *option)
1098 if (!g->qemu_help) {
1099 if (test_qemu (g) == -1)
1106 return strstr (g->qemu_help, option) != NULL;
1109 /* Check if a file can be opened. */
1111 is_openable (guestfs_h *g, const char *path, int flags)
1113 int fd = open (path, flags);
1115 debug (g, "is_openable: %s: %m", path);
1122 /* You had to call this function after launch in versions <= 1.0.70,
1123 * but it is now a no-op.
1126 guestfs__wait_ready (guestfs_h *g)
1128 if (g->state != READY) {
1129 error (g, _("qemu has not been launched yet"));
1137 guestfs__kill_subprocess (guestfs_h *g)
1139 if (g->state == CONFIG) {
1140 error (g, _("no subprocess to kill"));
1144 debug (g, "sending SIGTERM to process %d", g->pid);
1146 if (g->pid > 0) kill (g->pid, SIGTERM);
1147 if (g->recoverypid > 0) kill (g->recoverypid, 9);
1152 /* Access current state. */
1154 guestfs__is_config (guestfs_h *g)
1156 return g->state == CONFIG;
1160 guestfs__is_launching (guestfs_h *g)
1162 return g->state == LAUNCHING;
1166 guestfs__is_ready (guestfs_h *g)
1168 return g->state == READY;
1172 guestfs__is_busy (guestfs_h *g)
1174 return g->state == BUSY;
1178 guestfs__get_state (guestfs_h *g)