2 * Copyright (C) 2010-2011 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
39 #include "ignore-value.h"
43 #include "guestfs-internal.h"
44 #include "guestfs-internal-actions.h"
45 #include "guestfs_protocol.h"
47 #if defined(HAVE_HIVEX)
49 /* Compile all the regular expressions once when the shared library is
50 * loaded. PCRE is thread safe so we're supposedly OK here if
51 * multiple threads call into the libguestfs API functions below
54 static pcre *re_fedora;
55 static pcre *re_rhel_old;
57 static pcre *re_rhel_no_minor;
58 static pcre *re_centos_old;
59 static pcre *re_centos;
60 static pcre *re_centos_no_minor;
61 static pcre *re_scientific_linux_old;
62 static pcre *re_scientific_linux;
63 static pcre *re_scientific_linux_no_minor;
64 static pcre *re_major_minor;
65 static pcre *re_aug_seq;
67 static pcre *re_cciss;
68 static pcre *re_first_partition;
69 static pcre *re_freebsd;
70 static pcre *re_netbsd;
72 static void compile_regexps (void) __attribute__((constructor));
73 static void free_regexps (void) __attribute__((destructor));
76 compile_regexps (void)
81 #define COMPILE(re,pattern,options) \
83 re = pcre_compile ((pattern), (options), &err, &offset, NULL); \
85 ignore_value (write (2, err, strlen (err))); \
90 COMPILE (re_fedora, "Fedora release (\\d+)", 0);
92 "Red Hat.*release (\\d+).*Update (\\d+)", 0);
94 "Red Hat.*release (\\d+)\\.(\\d+)", 0);
95 COMPILE (re_rhel_no_minor,
96 "Red Hat.*release (\\d+)", 0);
97 COMPILE (re_centos_old,
98 "CentOS.*release (\\d+).*Update (\\d+)", 0);
100 "CentOS.*release (\\d+)\\.(\\d+)", 0);
101 COMPILE (re_centos_no_minor,
102 "CentOS.*release (\\d+)", 0);
103 COMPILE (re_scientific_linux_old,
104 "Scientific Linux.*release (\\d+).*Update (\\d+)", 0);
105 COMPILE (re_scientific_linux,
106 "Scientific Linux.*release (\\d+)\\.(\\d+)", 0);
107 COMPILE (re_scientific_linux_no_minor,
108 "Scientific Linux.*release (\\d+)", 0);
109 COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0);
110 COMPILE (re_aug_seq, "/\\d+$", 0);
111 COMPILE (re_xdev, "^/dev/(h|s|v|xv)d([a-z]+)(\\d*)$", 0);
112 COMPILE (re_cciss, "^/dev/(cciss/c\\d+d\\d+)(?:p(\\d+))?$", 0);
113 COMPILE (re_freebsd, "^/dev/ad(\\d+)s(\\d+)([a-z])$", 0);
114 COMPILE (re_netbsd, "^NetBSD (\\d+)\\.(\\d+)", 0);
120 pcre_free (re_fedora);
121 pcre_free (re_rhel_old);
123 pcre_free (re_rhel_no_minor);
124 pcre_free (re_centos_old);
125 pcre_free (re_centos);
126 pcre_free (re_centos_no_minor);
127 pcre_free (re_scientific_linux_old);
128 pcre_free (re_scientific_linux);
129 pcre_free (re_scientific_linux_no_minor);
130 pcre_free (re_major_minor);
131 pcre_free (re_aug_seq);
133 pcre_free (re_cciss);
134 pcre_free (re_freebsd);
135 pcre_free (re_netbsd);
138 static void check_architecture (guestfs_h *g, struct inspect_fs *fs);
139 static int check_hostname_unix (guestfs_h *g, struct inspect_fs *fs);
140 static int check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs);
141 static int check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs);
142 static int check_fstab (guestfs_h *g, struct inspect_fs *fs);
143 static int add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
144 const char *spec, const char *mp);
145 static char *resolve_fstab_device (guestfs_h *g, const char *spec);
146 static int inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs, const char **configfiles, int (*f) (guestfs_h *, struct inspect_fs *));
148 /* Set fs->product_name to the first line of the release file. */
150 parse_release_file (guestfs_h *g, struct inspect_fs *fs,
151 const char *release_filename)
153 fs->product_name = guestfs___first_line_of_file (g, release_filename);
154 if (fs->product_name == NULL)
159 /* Ubuntu has /etc/lsb-release containing:
160 * DISTRIB_ID=Ubuntu # Distro
161 * DISTRIB_RELEASE=10.04 # Version
162 * DISTRIB_CODENAME=lucid
163 * DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS" # Product name
165 * [Ubuntu-derived ...] Linux Mint was found to have this:
166 * DISTRIB_ID=LinuxMint
168 * DISTRIB_CODENAME=julia
169 * DISTRIB_DESCRIPTION="Linux Mint 10 Julia"
170 * Linux Mint also has /etc/linuxmint/info with more information,
171 * but we can use the LSB file.
174 * LSB_VERSION=lsb-4.0-amd64:lsb-4.0-noarch
175 * DISTRIB_ID=MandrivaLinux
176 * DISTRIB_RELEASE=2010.1
177 * DISTRIB_CODENAME=Henry_Farman
178 * DISTRIB_DESCRIPTION="Mandriva Linux 2010.1"
179 * Mandriva also has a normal release file called /etc/mandriva-release.
182 parse_lsb_release (guestfs_h *g, struct inspect_fs *fs)
184 const char *filename = "/etc/lsb-release";
190 /* Don't trust guestfs_head_n not to break with very large files.
191 * Check the file size is something reasonable first.
193 size = guestfs_filesize (g, filename);
195 /* guestfs_filesize failed and has already set error in handle */
197 if (size > MAX_SMALL_FILE_SIZE) {
198 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
203 lines = guestfs_head_n (g, 10, filename);
207 for (i = 0; lines[i] != NULL; ++i) {
208 if (fs->distro == 0 &&
209 STREQ (lines[i], "DISTRIB_ID=Ubuntu")) {
210 fs->distro = OS_DISTRO_UBUNTU;
213 else if (fs->distro == 0 &&
214 STREQ (lines[i], "DISTRIB_ID=LinuxMint")) {
215 fs->distro = OS_DISTRO_LINUX_MINT;
218 else if (fs->distro == 0 &&
219 STREQ (lines[i], "DISTRIB_ID=MandrivaLinux")) {
220 fs->distro = OS_DISTRO_MANDRIVA;
223 else if (fs->distro == 0 &&
224 STREQ (lines[i], "DISTRIB_ID=\"Mageia\"")) {
225 fs->distro = OS_DISTRO_MAGEIA;
228 else if (STRPREFIX (lines[i], "DISTRIB_RELEASE=")) {
230 if (match2 (g, &lines[i][16], re_major_minor, &major, &minor)) {
231 fs->major_version = guestfs___parse_unsigned_int (g, major);
233 if (fs->major_version == -1) {
235 guestfs___free_string_list (lines);
238 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
240 if (fs->minor_version == -1) {
241 guestfs___free_string_list (lines);
246 else if (fs->product_name == NULL &&
247 (STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=\"") ||
248 STRPREFIX (lines[i], "DISTRIB_DESCRIPTION='"))) {
249 size_t len = strlen (lines[i]) - 21 - 1;
250 fs->product_name = safe_strndup (g, &lines[i][21], len);
253 else if (fs->product_name == NULL &&
254 STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=")) {
255 size_t len = strlen (lines[i]) - 20;
256 fs->product_name = safe_strndup (g, &lines[i][20], len);
261 guestfs___free_string_list (lines);
265 /* The currently mounted device is known to be a Linux root. Try to
266 * determine from this the distro, version, etc. Also parse
267 * /etc/fstab to determine the arrangement of mountpoints and
268 * associated devices.
271 guestfs___check_linux_root (guestfs_h *g, struct inspect_fs *fs)
275 fs->type = OS_TYPE_LINUX;
277 if (guestfs_exists (g, "/etc/lsb-release") > 0) {
278 r = parse_lsb_release (g, fs);
279 if (r == -1) /* error */
281 if (r == 1) /* ok - detected the release from this file */
282 goto skip_release_checks;
285 if (guestfs_exists (g, "/etc/redhat-release") > 0) {
286 fs->distro = OS_DISTRO_REDHAT_BASED; /* Something generic Red Hat-like. */
288 if (parse_release_file (g, fs, "/etc/redhat-release") == -1)
292 if ((major = match1 (g, fs->product_name, re_fedora)) != NULL) {
293 fs->distro = OS_DISTRO_FEDORA;
294 fs->major_version = guestfs___parse_unsigned_int (g, major);
296 if (fs->major_version == -1)
299 else if (match2 (g, fs->product_name, re_rhel_old, &major, &minor) ||
300 match2 (g, fs->product_name, re_rhel, &major, &minor)) {
301 fs->distro = OS_DISTRO_RHEL;
302 fs->major_version = guestfs___parse_unsigned_int (g, major);
304 if (fs->major_version == -1) {
308 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
310 if (fs->minor_version == -1)
313 else if ((major = match1 (g, fs->product_name, re_rhel_no_minor)) != NULL) {
314 fs->distro = OS_DISTRO_RHEL;
315 fs->major_version = guestfs___parse_unsigned_int (g, major);
317 if (fs->major_version == -1)
319 fs->minor_version = 0;
321 else if (match2 (g, fs->product_name, re_centos_old, &major, &minor) ||
322 match2 (g, fs->product_name, re_centos, &major, &minor)) {
323 fs->distro = OS_DISTRO_CENTOS;
324 fs->major_version = guestfs___parse_unsigned_int (g, major);
326 if (fs->major_version == -1) {
330 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
332 if (fs->minor_version == -1)
335 else if ((major = match1 (g, fs->product_name, re_centos_no_minor)) != NULL) {
336 fs->distro = OS_DISTRO_CENTOS;
337 fs->major_version = guestfs___parse_unsigned_int (g, major);
339 if (fs->major_version == -1)
341 fs->minor_version = 0;
343 else if (match2 (g, fs->product_name, re_scientific_linux_old, &major, &minor) ||
344 match2 (g, fs->product_name, re_scientific_linux, &major, &minor)) {
345 fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
346 fs->major_version = guestfs___parse_unsigned_int (g, major);
348 if (fs->major_version == -1) {
352 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
354 if (fs->minor_version == -1)
357 else if ((major = match1 (g, fs->product_name, re_scientific_linux_no_minor)) != NULL) {
358 fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
359 fs->major_version = guestfs___parse_unsigned_int (g, major);
361 if (fs->major_version == -1)
363 fs->minor_version = 0;
366 else if (guestfs_exists (g, "/etc/debian_version") > 0) {
367 fs->distro = OS_DISTRO_DEBIAN;
369 if (parse_release_file (g, fs, "/etc/debian_version") == -1)
372 if (guestfs___parse_major_minor (g, fs) == -1)
375 else if (guestfs_exists (g, "/etc/pardus-release") > 0) {
376 fs->distro = OS_DISTRO_PARDUS;
378 if (parse_release_file (g, fs, "/etc/pardus-release") == -1)
381 if (guestfs___parse_major_minor (g, fs) == -1)
384 else if (guestfs_exists (g, "/etc/arch-release") > 0) {
385 fs->distro = OS_DISTRO_ARCHLINUX;
387 /* /etc/arch-release file is empty and I can't see a way to
388 * determine the actual release or product string.
391 else if (guestfs_exists (g, "/etc/gentoo-release") > 0) {
392 fs->distro = OS_DISTRO_GENTOO;
394 if (parse_release_file (g, fs, "/etc/gentoo-release") == -1)
397 if (guestfs___parse_major_minor (g, fs) == -1)
400 else if (guestfs_exists (g, "/etc/meego-release") > 0) {
401 fs->distro = OS_DISTRO_MEEGO;
403 if (parse_release_file (g, fs, "/etc/meego-release") == -1)
406 if (guestfs___parse_major_minor (g, fs) == -1)
409 else if (guestfs_exists (g, "/etc/slackware-version") > 0) {
410 fs->distro = OS_DISTRO_SLACKWARE;
412 if (parse_release_file (g, fs, "/etc/slackware-version") == -1)
415 if (guestfs___parse_major_minor (g, fs) == -1)
418 else if (guestfs_exists (g, "/etc/ttylinux-target") > 0) {
419 fs->distro = OS_DISTRO_TTYLINUX;
421 fs->product_name = guestfs___first_line_of_file (g, "/etc/ttylinux-target");
422 if (fs->product_name == NULL)
425 if (guestfs___parse_major_minor (g, fs) == -1)
428 else if (guestfs_exists (g, "/etc/SuSE-release") > 0) {
429 fs->distro = OS_DISTRO_OPENSUSE;
431 if (parse_release_file (g, fs, "/etc/SuSE-release") == -1)
434 if (guestfs___parse_major_minor (g, fs) == -1)
439 skip_release_checks:;
441 /* Determine the architecture. */
442 check_architecture (g, fs);
444 /* We already know /etc/fstab exists because it's part of the test
445 * for Linux root above. We must now parse this file to determine
446 * which filesystems are used by the operating system and how they
449 const char *configfiles[] = { "/etc/fstab", NULL };
450 if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
453 /* Determine hostname. */
454 if (check_hostname_unix (g, fs) == -1)
460 /* The currently mounted device is known to be a FreeBSD root. */
462 guestfs___check_freebsd_root (guestfs_h *g, struct inspect_fs *fs)
464 fs->type = OS_TYPE_FREEBSD;
466 /* FreeBSD has no authoritative version file. The version number is
467 * in /etc/motd, which the system administrator might edit, but
468 * we'll use that anyway.
471 if (guestfs_exists (g, "/etc/motd") > 0) {
472 if (parse_release_file (g, fs, "/etc/motd") == -1)
475 if (guestfs___parse_major_minor (g, fs) == -1)
479 /* Determine the architecture. */
480 check_architecture (g, fs);
482 /* We already know /etc/fstab exists because it's part of the test above. */
483 const char *configfiles[] = { "/etc/fstab", NULL };
484 if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
487 /* Determine hostname. */
488 if (check_hostname_unix (g, fs) == -1)
494 /* The currently mounted device is maybe to be a *BSD root. */
496 guestfs___check_netbsd_root (guestfs_h *g, struct inspect_fs *fs)
499 if (guestfs_exists (g, "/etc/release") > 0) {
501 if (parse_release_file (g, fs, "/etc/release") == -1)
504 if (match2 (g, fs->product_name, re_netbsd, &major, &minor)) {
505 fs->type = OS_TYPE_NETBSD;
506 fs->major_version = guestfs___parse_unsigned_int (g, major);
508 if (fs->major_version == -1) {
512 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
514 if (fs->minor_version == -1)
521 /* Determine the architecture. */
522 check_architecture (g, fs);
524 /* We already know /etc/fstab exists because it's part of the test above. */
525 const char *configfiles[] = { "/etc/fstab", NULL };
526 if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
529 /* Determine hostname. */
530 if (check_hostname_unix (g, fs) == -1)
538 check_architecture (guestfs_h *g, struct inspect_fs *fs)
540 const char *binaries[] =
541 { "/bin/bash", "/bin/ls", "/bin/echo", "/bin/rm", "/bin/sh" };
544 for (i = 0; i < sizeof binaries / sizeof binaries[0]; ++i) {
545 if (guestfs_is_file (g, binaries[i]) > 0) {
546 /* Ignore errors from file_architecture call. */
547 guestfs_error_handler_cb old_error_cb = g->error_cb;
549 char *arch = guestfs_file_architecture (g, binaries[i]);
550 g->error_cb = old_error_cb;
553 /* String will be owned by handle, freed by
554 * guestfs___free_inspect_info.
563 /* Try several methods to determine the hostname from a Linux or
564 * FreeBSD guest. Note that type and distro have been set, so we can
565 * use that information to direct the search.
568 check_hostname_unix (guestfs_h *g, struct inspect_fs *fs)
572 /* Red Hat-derived would be in /etc/sysconfig/network, and
573 * Debian-derived in the file /etc/hostname. Very old Debian and
574 * SUSE use /etc/HOSTNAME. It's best to just look for each of
575 * these files in turn, rather than try anything clever based on
578 if (guestfs_is_file (g, "/etc/HOSTNAME")) {
579 fs->hostname = guestfs___first_line_of_file (g, "/etc/HOSTNAME");
580 if (fs->hostname == NULL)
583 else if (guestfs_is_file (g, "/etc/hostname")) {
584 fs->hostname = guestfs___first_line_of_file (g, "/etc/hostname");
585 if (fs->hostname == NULL)
588 else if (guestfs_is_file (g, "/etc/sysconfig/network")) {
589 const char *configfiles[] = { "/etc/sysconfig/network", NULL };
590 if (inspect_with_augeas (g, fs, configfiles,
591 check_hostname_redhat) == -1)
596 case OS_TYPE_FREEBSD:
598 /* /etc/rc.conf contains the hostname, but there is no Augeas lens
601 if (guestfs_is_file (g, "/etc/rc.conf")) {
602 if (check_hostname_freebsd (g, fs) == -1)
607 case OS_TYPE_WINDOWS: /* not here, see check_windows_system_registry */
608 case OS_TYPE_UNKNOWN:
610 /* nothing, keep GCC warnings happy */;
616 /* Parse the hostname from /etc/sysconfig/network. This must be called
617 * from the inspect_with_augeas wrapper.
620 check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs)
624 /* Errors here are not fatal (RHBZ#726739), since it could be
625 * just missing HOSTNAME field in the file.
627 guestfs_error_handler_cb old_error_cb = g->error_cb;
629 hostname = guestfs_aug_get (g, "/files/etc/sysconfig/network/HOSTNAME");
630 g->error_cb = old_error_cb;
632 /* This is freed by guestfs___free_inspect_info. Note that hostname
633 * could be NULL because we ignored errors above.
635 fs->hostname = hostname;
639 /* Parse the hostname from /etc/rc.conf. On FreeBSD this file
640 * contains comments, blank lines and:
641 * hostname="freebsd8.example.com"
642 * ifconfig_re0="DHCP"
647 check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs)
649 const char *filename = "/etc/rc.conf";
654 /* Don't trust guestfs_read_lines not to break with very large files.
655 * Check the file size is something reasonable first.
657 size = guestfs_filesize (g, filename);
659 /* guestfs_filesize failed and has already set error in handle */
661 if (size > MAX_SMALL_FILE_SIZE) {
662 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
667 lines = guestfs_read_lines (g, filename);
671 for (i = 0; lines[i] != NULL; ++i) {
672 if (STRPREFIX (lines[i], "hostname=\"") ||
673 STRPREFIX (lines[i], "hostname='")) {
674 size_t len = strlen (lines[i]) - 10 - 1;
675 fs->hostname = safe_strndup (g, &lines[i][10], len);
677 } else if (STRPREFIX (lines[i], "hostname=")) {
678 size_t len = strlen (lines[i]) - 9;
679 fs->hostname = safe_strndup (g, &lines[i][9], len);
684 guestfs___free_string_list (lines);
689 check_fstab (guestfs_h *g, struct inspect_fs *fs)
691 char **lines = guestfs_aug_ls (g, "/files/etc/fstab");
692 if (lines == NULL) goto error;
694 if (lines[0] == NULL) {
695 error (g, _("could not parse /etc/fstab or empty file"));
701 for (i = 0; lines[i] != NULL; ++i) {
702 /* Ignore comments. Only care about sequence lines which
705 if (match (g, lines[i], re_aug_seq)) {
706 snprintf (augpath, sizeof augpath, "%s/spec", lines[i]);
707 char *spec = guestfs_aug_get (g, augpath);
708 if (spec == NULL) goto error;
710 snprintf (augpath, sizeof augpath, "%s/file", lines[i]);
711 char *mp = guestfs_aug_get (g, augpath);
717 int r = add_fstab_entry (g, fs, spec, mp);
721 if (r == -1) goto error;
725 guestfs___free_string_list (lines);
729 if (lines) guestfs___free_string_list (lines);
733 /* Add a filesystem and possibly a mountpoint entry for
734 * the root filesystem 'fs'.
736 * 'spec' is the fstab spec field, which might be a device name or a
737 * pseudodevice or 'UUID=...' or 'LABEL=...'.
739 * 'mp' is the mount point, which could also be 'swap' or 'none'.
742 add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
743 const char *spec, const char *mp)
745 /* Ignore certain mountpoints. */
746 if (STRPREFIX (mp, "/dev/") ||
747 STREQ (mp, "/dev") ||
748 STRPREFIX (mp, "/media/") ||
749 STRPREFIX (mp, "/proc/") ||
750 STREQ (mp, "/proc") ||
751 STRPREFIX (mp, "/selinux/") ||
752 STREQ (mp, "/selinux") ||
753 STRPREFIX (mp, "/sys/") ||
757 /* Ignore /dev/fd (floppy disks) (RHBZ#642929) and CD-ROM drives. */
758 if ((STRPREFIX (spec, "/dev/fd") && c_isdigit (spec[7])) ||
759 STREQ (spec, "/dev/floppy") ||
760 STREQ (spec, "/dev/cdrom"))
763 /* Resolve UUID= and LABEL= to the actual device. */
765 if (STRPREFIX (spec, "UUID="))
766 device = guestfs_findfs_uuid (g, &spec[5]);
767 else if (STRPREFIX (spec, "LABEL="))
768 device = guestfs_findfs_label (g, &spec[6]);
769 /* Ignore "/.swap" (Pardus) and pseudo-devices like "tmpfs". */
770 else if (STREQ (spec, "/dev/root"))
771 /* Resolve /dev/root to the current device. */
772 device = safe_strdup (g, fs->device);
773 else if (STRPREFIX (spec, "/dev/"))
774 /* Resolve guest block device names. */
775 device = resolve_fstab_device (g, spec);
777 /* If we haven't resolved the device successfully by this point,
778 * we don't care, just ignore it.
783 char *mountpoint = safe_strdup (g, mp);
785 /* Add this to the fstab entry in 'fs'.
786 * Note these are further filtered by guestfs_inspect_get_mountpoints
787 * and guestfs_inspect_get_filesystems.
789 size_t n = fs->nr_fstab + 1;
790 struct inspect_fstab_entry *p;
792 p = realloc (fs->fstab, n * sizeof (struct inspect_fstab_entry));
794 perrorf (g, "realloc");
803 /* These are owned by the handle and freed by guestfs___free_inspect_info. */
804 fs->fstab[n-1].device = device;
805 fs->fstab[n-1].mountpoint = mountpoint;
807 debug (g, "fstab: device=%s mountpoint=%s", device, mountpoint);
812 /* Resolve block device name to the libguestfs device name, eg.
813 * /dev/xvdb1 => /dev/vdb1; and /dev/mapper/VG-LV => /dev/VG/LV. This
814 * assumes that disks were added in the same order as they appear to
815 * the real VM, which is a reasonable assumption to make. Return
816 * anything we don't recognize unchanged.
819 resolve_fstab_device (guestfs_h *g, const char *spec)
822 char *type, *slice, *disk, *part;
824 if (STRPREFIX (spec, "/dev/mapper/")) {
825 /* LVM2 does some strange munging on /dev/mapper paths for VGs and
826 * LVs which contain '-' character:
828 * ><fs> lvcreate LV--test VG--test 32
829 * ><fs> debug ls /dev/mapper
830 * VG----test-LV----test
832 * This makes it impossible to reverse those paths directly, so
833 * we have implemented lvm_canonical_lv_name in the daemon.
835 device = guestfs_lvm_canonical_lv_name (g, spec);
837 else if (match3 (g, spec, re_xdev, &type, &disk, &part)) {
841 char **devices = guestfs_list_devices (g);
845 /* Check any hints we were passed for a non-heuristic mapping */
846 char *name = safe_asprintf (g, "%sd%s", type, disk);
848 struct drive *drive = g->drives;
850 if (drive->name && STREQ(drive->name, name)) {
851 device = safe_asprintf (g, "%s%s", devices[i], part);
855 i++; drive = drive->next;
859 /* Guess the appliance device name if we didn't find a matching hint */
861 /* Count how many disks the libguestfs appliance has */
863 for (count = 0; devices[count] != NULL; count++)
866 /* Calculate the numerical index of the disk */
868 for (char *p = disk + 1; *p != '\0'; p++) {
873 /* Check the index makes sense wrt the number of disks the appliance has.
874 * If it does, map it to an appliance disk. */
876 device = safe_asprintf (g, "%s%s", devices[i], part);
883 guestfs___free_string_list (devices);
885 else if (match2 (g, spec, re_cciss, &disk, &part)) {
886 /* disk: (cciss/c\d+d\d+)
888 char **devices = guestfs_list_devices (g);
892 /* Check any hints we were passed for a non-heuristic mapping */
894 struct drive *drive = g->drives;
896 if (drive->name && STREQ(drive->name, disk)) {
898 device = safe_asprintf (g, "%s%s", devices[i], part);
900 device = safe_strdup (g, devices[i]);
905 i++; drive = drive->next;
908 /* We don't try to guess mappings for cciss devices */
912 guestfs___free_string_list (devices);
914 else if (match3 (g, spec, re_freebsd, &disk, &slice, &part)) {
915 /* FreeBSD disks are organized quite differently. See:
916 * http://www.freebsd.org/doc/handbook/disk-organization.html
917 * FreeBSD "partitions" are exposed as quasi-extended partitions
918 * numbered from 5 in Linux. I have no idea what happens when you
919 * have multiple "slices" (the FreeBSD term for MBR partitions).
921 int disk_i = guestfs___parse_unsigned_int (g, disk);
922 int slice_i = guestfs___parse_unsigned_int (g, slice);
923 int part_i = part[0] - 'a' /* counting from 0 */;
928 if (disk_i != -1 && disk_i <= 26 &&
929 slice_i > 0 && slice_i <= 1 /* > 4 .. see comment above */ &&
930 part_i >= 0 && part_i < 26) {
931 device = safe_asprintf (g, "/dev/sd%c%d", disk_i + 'a', part_i + 5);
935 /* Didn't match device pattern, return original spec unchanged. */
937 device = safe_strdup (g, spec);
942 /* Call 'f' with Augeas opened and having parsed 'filename' (this file
943 * must exist). As a security measure, this bails if the file is too
944 * large for a reasonable configuration file. After the call to 'f'
948 inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs,
949 const char **configfiles,
950 int (*f) (guestfs_h *, struct inspect_fs *))
952 /* Security: Refuse to do this if a config file is too large. */
953 for (const char **i = configfiles; *i != NULL; i++) {
954 if (guestfs_exists(g, *i) == 0) continue;
956 int64_t size = guestfs_filesize (g, *i);
958 /* guestfs_filesize failed and has already set error in handle */
960 if (size > MAX_AUGEAS_FILE_SIZE) {
961 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
967 /* If !feature_available (g, "augeas") then the next call will fail.
968 * Arguably we might want to fall back to a non-Augeas method in
971 if (guestfs_aug_init (g, "/", 16|32) == -1)
976 /* Tell Augeas to only load one file (thanks Raphaƫl Pinson). */
977 #define AUGEAS_LOAD "/augeas/load//incl[. != \""
978 #define AUGEAS_LOAD_LEN (strlen(AUGEAS_LOAD))
979 size_t conflen = strlen(configfiles[0]);
980 size_t buflen = AUGEAS_LOAD_LEN + conflen + 1 /* Closing " */;
981 char *buf = safe_malloc(g, buflen + 2 /* Closing ] + null terminator */);
983 memcpy(buf, AUGEAS_LOAD, AUGEAS_LOAD_LEN);
984 memcpy(buf + AUGEAS_LOAD_LEN, configfiles[0], conflen);
985 buf[buflen - 1] = '"';
986 #undef AUGEAS_LOAD_LEN
989 #define EXCL " and . != \""
990 #define EXCL_LEN (strlen(EXCL))
991 for (const char **i = &configfiles[1]; *i != NULL; i++) {
992 size_t orig_buflen = buflen;
993 conflen = strlen(*i);
994 buflen += EXCL_LEN + conflen + 1 /* Closing " */;
995 buf = safe_realloc(g, buf, buflen + 2 /* Closing ] + null terminator */);
996 char *s = buf + orig_buflen;
998 memcpy(s, EXCL, EXCL_LEN);
999 memcpy(s + EXCL_LEN, *i, conflen);
1000 buf[buflen - 1] = '"';
1006 buf[buflen + 1] = '\0';
1008 if (guestfs_aug_rm (g, buf) == -1) {
1014 if (guestfs_aug_load (g) == -1)
1020 guestfs_aug_close (g);
1025 #endif /* defined(HAVE_HIVEX) */