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_first_partition;
68 static pcre *re_freebsd;
70 static void compile_regexps (void) __attribute__((constructor));
71 static void free_regexps (void) __attribute__((destructor));
74 compile_regexps (void)
79 #define COMPILE(re,pattern,options) \
81 re = pcre_compile ((pattern), (options), &err, &offset, NULL); \
83 ignore_value (write (2, err, strlen (err))); \
88 COMPILE (re_fedora, "Fedora release (\\d+)", 0);
90 "Red Hat.*release (\\d+).*Update (\\d+)", 0);
92 "Red Hat.*release (\\d+)\\.(\\d+)", 0);
93 COMPILE (re_rhel_no_minor,
94 "Red Hat.*release (\\d+)", 0);
95 COMPILE (re_centos_old,
96 "CentOS.*release (\\d+).*Update (\\d+)", 0);
98 "CentOS.*release (\\d+)\\.(\\d+)", 0);
99 COMPILE (re_centos_no_minor,
100 "CentOS.*release (\\d+)", 0);
101 COMPILE (re_scientific_linux_old,
102 "Scientific Linux.*release (\\d+).*Update (\\d+)", 0);
103 COMPILE (re_scientific_linux,
104 "Scientific Linux.*release (\\d+)\\.(\\d+)", 0);
105 COMPILE (re_scientific_linux_no_minor,
106 "Scientific Linux.*release (\\d+)", 0);
107 COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0);
108 COMPILE (re_aug_seq, "/\\d+$", 0);
109 COMPILE (re_xdev, "^/dev/(?:h|s|v|xv)d([a-z]\\d*)$", 0);
110 COMPILE (re_freebsd, "^/dev/ad(\\d+)s(\\d+)([a-z])$", 0);
116 pcre_free (re_fedora);
117 pcre_free (re_rhel_old);
119 pcre_free (re_rhel_no_minor);
120 pcre_free (re_centos_old);
121 pcre_free (re_centos);
122 pcre_free (re_centos_no_minor);
123 pcre_free (re_scientific_linux_old);
124 pcre_free (re_scientific_linux);
125 pcre_free (re_scientific_linux_no_minor);
126 pcre_free (re_major_minor);
127 pcre_free (re_aug_seq);
129 pcre_free (re_freebsd);
132 static void check_architecture (guestfs_h *g, struct inspect_fs *fs);
133 static int check_hostname_unix (guestfs_h *g, struct inspect_fs *fs);
134 static int check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs);
135 static int check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs);
136 static int check_fstab (guestfs_h *g, struct inspect_fs *fs);
137 static int add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
138 const char *spec, const char *mp);
139 static char *resolve_fstab_device (guestfs_h *g, const char *spec);
140 static int inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs, const char *filename, int (*f) (guestfs_h *, struct inspect_fs *));
142 /* Set fs->product_name to the first line of the release file. */
144 parse_release_file (guestfs_h *g, struct inspect_fs *fs,
145 const char *release_filename)
147 fs->product_name = guestfs___first_line_of_file (g, release_filename);
148 if (fs->product_name == NULL)
153 /* Ubuntu has /etc/lsb-release containing:
154 * DISTRIB_ID=Ubuntu # Distro
155 * DISTRIB_RELEASE=10.04 # Version
156 * DISTRIB_CODENAME=lucid
157 * DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS" # Product name
159 * [Ubuntu-derived ...] Linux Mint was found to have this:
160 * DISTRIB_ID=LinuxMint
162 * DISTRIB_CODENAME=julia
163 * DISTRIB_DESCRIPTION="Linux Mint 10 Julia"
164 * Linux Mint also has /etc/linuxmint/info with more information,
165 * but we can use the LSB file.
168 * LSB_VERSION=lsb-4.0-amd64:lsb-4.0-noarch
169 * DISTRIB_ID=MandrivaLinux
170 * DISTRIB_RELEASE=2010.1
171 * DISTRIB_CODENAME=Henry_Farman
172 * DISTRIB_DESCRIPTION="Mandriva Linux 2010.1"
173 * Mandriva also has a normal release file called /etc/mandriva-release.
176 parse_lsb_release (guestfs_h *g, struct inspect_fs *fs)
178 const char *filename = "/etc/lsb-release";
184 /* Don't trust guestfs_head_n not to break with very large files.
185 * Check the file size is something reasonable first.
187 size = guestfs_filesize (g, filename);
189 /* guestfs_filesize failed and has already set error in handle */
191 if (size > MAX_SMALL_FILE_SIZE) {
192 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
197 lines = guestfs_head_n (g, 10, filename);
201 for (i = 0; lines[i] != NULL; ++i) {
202 if (fs->distro == 0 &&
203 STREQ (lines[i], "DISTRIB_ID=Ubuntu")) {
204 fs->distro = OS_DISTRO_UBUNTU;
207 else if (fs->distro == 0 &&
208 STREQ (lines[i], "DISTRIB_ID=LinuxMint")) {
209 fs->distro = OS_DISTRO_LINUX_MINT;
212 else if (fs->distro == 0 &&
213 STREQ (lines[i], "DISTRIB_ID=MandrivaLinux")) {
214 fs->distro = OS_DISTRO_MANDRIVA;
217 else if (fs->distro == 0 &&
218 STREQ (lines[i], "DISTRIB_ID=\"Mageia\"")) {
219 fs->distro = OS_DISTRO_MAGEIA;
222 else if (STRPREFIX (lines[i], "DISTRIB_RELEASE=")) {
224 if (match2 (g, &lines[i][16], re_major_minor, &major, &minor)) {
225 fs->major_version = guestfs___parse_unsigned_int (g, major);
227 if (fs->major_version == -1) {
229 guestfs___free_string_list (lines);
232 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
234 if (fs->minor_version == -1) {
235 guestfs___free_string_list (lines);
240 else if (fs->product_name == NULL &&
241 (STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=\"") ||
242 STRPREFIX (lines[i], "DISTRIB_DESCRIPTION='"))) {
243 size_t len = strlen (lines[i]) - 21 - 1;
244 fs->product_name = safe_strndup (g, &lines[i][21], len);
247 else if (fs->product_name == NULL &&
248 STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=")) {
249 size_t len = strlen (lines[i]) - 20;
250 fs->product_name = safe_strndup (g, &lines[i][20], len);
255 guestfs___free_string_list (lines);
259 /* The currently mounted device is known to be a Linux root. Try to
260 * determine from this the distro, version, etc. Also parse
261 * /etc/fstab to determine the arrangement of mountpoints and
262 * associated devices.
265 guestfs___check_linux_root (guestfs_h *g, struct inspect_fs *fs)
269 fs->type = OS_TYPE_LINUX;
271 if (guestfs_exists (g, "/etc/lsb-release") > 0) {
272 r = parse_lsb_release (g, fs);
273 if (r == -1) /* error */
275 if (r == 1) /* ok - detected the release from this file */
276 goto skip_release_checks;
279 if (guestfs_exists (g, "/etc/redhat-release") > 0) {
280 fs->distro = OS_DISTRO_REDHAT_BASED; /* Something generic Red Hat-like. */
282 if (parse_release_file (g, fs, "/etc/redhat-release") == -1)
286 if ((major = match1 (g, fs->product_name, re_fedora)) != NULL) {
287 fs->distro = OS_DISTRO_FEDORA;
288 fs->major_version = guestfs___parse_unsigned_int (g, major);
290 if (fs->major_version == -1)
293 else if (match2 (g, fs->product_name, re_rhel_old, &major, &minor) ||
294 match2 (g, fs->product_name, re_rhel, &major, &minor)) {
295 fs->distro = OS_DISTRO_RHEL;
296 fs->major_version = guestfs___parse_unsigned_int (g, major);
298 if (fs->major_version == -1) {
302 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
304 if (fs->minor_version == -1)
307 else if ((major = match1 (g, fs->product_name, re_rhel_no_minor)) != NULL) {
308 fs->distro = OS_DISTRO_RHEL;
309 fs->major_version = guestfs___parse_unsigned_int (g, major);
311 if (fs->major_version == -1)
313 fs->minor_version = 0;
315 else if (match2 (g, fs->product_name, re_centos_old, &major, &minor) ||
316 match2 (g, fs->product_name, re_centos, &major, &minor)) {
317 fs->distro = OS_DISTRO_CENTOS;
318 fs->major_version = guestfs___parse_unsigned_int (g, major);
320 if (fs->major_version == -1) {
324 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
326 if (fs->minor_version == -1)
329 else if ((major = match1 (g, fs->product_name, re_centos_no_minor)) != NULL) {
330 fs->distro = OS_DISTRO_CENTOS;
331 fs->major_version = guestfs___parse_unsigned_int (g, major);
333 if (fs->major_version == -1)
335 fs->minor_version = 0;
337 else if (match2 (g, fs->product_name, re_scientific_linux_old, &major, &minor) ||
338 match2 (g, fs->product_name, re_scientific_linux, &major, &minor)) {
339 fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
340 fs->major_version = guestfs___parse_unsigned_int (g, major);
342 if (fs->major_version == -1) {
346 fs->minor_version = guestfs___parse_unsigned_int (g, minor);
348 if (fs->minor_version == -1)
351 else if ((major = match1 (g, fs->product_name, re_scientific_linux_no_minor)) != NULL) {
352 fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
353 fs->major_version = guestfs___parse_unsigned_int (g, major);
355 if (fs->major_version == -1)
357 fs->minor_version = 0;
360 else if (guestfs_exists (g, "/etc/debian_version") > 0) {
361 fs->distro = OS_DISTRO_DEBIAN;
363 if (parse_release_file (g, fs, "/etc/debian_version") == -1)
366 if (guestfs___parse_major_minor (g, fs) == -1)
369 else if (guestfs_exists (g, "/etc/pardus-release") > 0) {
370 fs->distro = OS_DISTRO_PARDUS;
372 if (parse_release_file (g, fs, "/etc/pardus-release") == -1)
375 if (guestfs___parse_major_minor (g, fs) == -1)
378 else if (guestfs_exists (g, "/etc/arch-release") > 0) {
379 fs->distro = OS_DISTRO_ARCHLINUX;
381 /* /etc/arch-release file is empty and I can't see a way to
382 * determine the actual release or product string.
385 else if (guestfs_exists (g, "/etc/gentoo-release") > 0) {
386 fs->distro = OS_DISTRO_GENTOO;
388 if (parse_release_file (g, fs, "/etc/gentoo-release") == -1)
391 if (guestfs___parse_major_minor (g, fs) == -1)
394 else if (guestfs_exists (g, "/etc/meego-release") > 0) {
395 fs->distro = OS_DISTRO_MEEGO;
397 if (parse_release_file (g, fs, "/etc/meego-release") == -1)
400 if (guestfs___parse_major_minor (g, fs) == -1)
403 else if (guestfs_exists (g, "/etc/slackware-version") > 0) {
404 fs->distro = OS_DISTRO_SLACKWARE;
406 if (parse_release_file (g, fs, "/etc/slackware-version") == -1)
409 if (guestfs___parse_major_minor (g, fs) == -1)
412 else if (guestfs_exists (g, "/etc/ttylinux-target") > 0) {
413 fs->distro = OS_DISTRO_TTYLINUX;
415 fs->product_name = guestfs___first_line_of_file (g, "/etc/ttylinux-target");
416 if (fs->product_name == NULL)
419 if (guestfs___parse_major_minor (g, fs) == -1)
422 else if (guestfs_exists (g, "/etc/SuSE-release") > 0) {
423 fs->distro = OS_DISTRO_OPENSUSE;
425 if (parse_release_file (g, fs, "/etc/SuSE-release") == -1)
428 if (guestfs___parse_major_minor (g, fs) == -1)
433 skip_release_checks:;
435 /* Determine the architecture. */
436 check_architecture (g, fs);
438 /* We already know /etc/fstab exists because it's part of the test
439 * for Linux root above. We must now parse this file to determine
440 * which filesystems are used by the operating system and how they
443 if (inspect_with_augeas (g, fs, "/etc/fstab", check_fstab) == -1)
446 /* Determine hostname. */
447 if (check_hostname_unix (g, fs) == -1)
453 /* The currently mounted device is known to be a FreeBSD root. */
455 guestfs___check_freebsd_root (guestfs_h *g, struct inspect_fs *fs)
457 fs->type = OS_TYPE_FREEBSD;
459 /* FreeBSD has no authoritative version file. The version number is
460 * in /etc/motd, which the system administrator might edit, but
461 * we'll use that anyway.
464 if (guestfs_exists (g, "/etc/motd") > 0) {
465 if (parse_release_file (g, fs, "/etc/motd") == -1)
468 if (guestfs___parse_major_minor (g, fs) == -1)
472 /* Determine the architecture. */
473 check_architecture (g, fs);
475 /* We already know /etc/fstab exists because it's part of the test above. */
476 if (inspect_with_augeas (g, fs, "/etc/fstab", check_fstab) == -1)
479 /* Determine hostname. */
480 if (check_hostname_unix (g, fs) == -1)
487 check_architecture (guestfs_h *g, struct inspect_fs *fs)
489 const char *binaries[] =
490 { "/bin/bash", "/bin/ls", "/bin/echo", "/bin/rm", "/bin/sh" };
493 for (i = 0; i < sizeof binaries / sizeof binaries[0]; ++i) {
494 if (guestfs_is_file (g, binaries[i]) > 0) {
495 /* Ignore errors from file_architecture call. */
496 guestfs_error_handler_cb old_error_cb = g->error_cb;
498 char *arch = guestfs_file_architecture (g, binaries[i]);
499 g->error_cb = old_error_cb;
502 /* String will be owned by handle, freed by
503 * guestfs___free_inspect_info.
512 /* Try several methods to determine the hostname from a Linux or
513 * FreeBSD guest. Note that type and distro have been set, so we can
514 * use that information to direct the search.
517 check_hostname_unix (guestfs_h *g, struct inspect_fs *fs)
521 /* Red Hat-derived would be in /etc/sysconfig/network, and
522 * Debian-derived in the file /etc/hostname. Very old Debian and
523 * SUSE use /etc/HOSTNAME. It's best to just look for each of
524 * these files in turn, rather than try anything clever based on
527 if (guestfs_is_file (g, "/etc/HOSTNAME")) {
528 fs->hostname = guestfs___first_line_of_file (g, "/etc/HOSTNAME");
529 if (fs->hostname == NULL)
532 else if (guestfs_is_file (g, "/etc/hostname")) {
533 fs->hostname = guestfs___first_line_of_file (g, "/etc/hostname");
534 if (fs->hostname == NULL)
537 else if (guestfs_is_file (g, "/etc/sysconfig/network")) {
538 if (inspect_with_augeas (g, fs, "/etc/sysconfig/network",
539 check_hostname_redhat) == -1)
544 case OS_TYPE_FREEBSD:
545 /* /etc/rc.conf contains the hostname, but there is no Augeas lens
548 if (guestfs_is_file (g, "/etc/rc.conf")) {
549 if (check_hostname_freebsd (g, fs) == -1)
554 case OS_TYPE_WINDOWS: /* not here, see check_windows_system_registry */
555 case OS_TYPE_UNKNOWN:
557 /* nothing, keep GCC warnings happy */;
563 /* Parse the hostname from /etc/sysconfig/network. This must be called
564 * from the inspect_with_augeas wrapper.
567 check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs)
571 /* Errors here are not fatal (RHBZ#726739), since it could be
572 * just missing HOSTNAME field in the file.
574 guestfs_error_handler_cb old_error_cb = g->error_cb;
576 hostname = guestfs_aug_get (g, "/files/etc/sysconfig/network/HOSTNAME");
577 g->error_cb = old_error_cb;
579 /* This is freed by guestfs___free_inspect_info. Note that hostname
580 * could be NULL because we ignored errors above.
582 fs->hostname = hostname;
586 /* Parse the hostname from /etc/rc.conf. On FreeBSD this file
587 * contains comments, blank lines and:
588 * hostname="freebsd8.example.com"
589 * ifconfig_re0="DHCP"
594 check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs)
596 const char *filename = "/etc/rc.conf";
601 /* Don't trust guestfs_read_lines not to break with very large files.
602 * Check the file size is something reasonable first.
604 size = guestfs_filesize (g, filename);
606 /* guestfs_filesize failed and has already set error in handle */
608 if (size > MAX_SMALL_FILE_SIZE) {
609 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
614 lines = guestfs_read_lines (g, filename);
618 for (i = 0; lines[i] != NULL; ++i) {
619 if (STRPREFIX (lines[i], "hostname=\"") ||
620 STRPREFIX (lines[i], "hostname='")) {
621 size_t len = strlen (lines[i]) - 10 - 1;
622 fs->hostname = safe_strndup (g, &lines[i][10], len);
624 } else if (STRPREFIX (lines[i], "hostname=")) {
625 size_t len = strlen (lines[i]) - 9;
626 fs->hostname = safe_strndup (g, &lines[i][9], len);
631 guestfs___free_string_list (lines);
636 check_fstab (guestfs_h *g, struct inspect_fs *fs)
638 char **lines = guestfs_aug_ls (g, "/files/etc/fstab");
642 if (lines[0] == NULL) {
643 error (g, _("could not parse /etc/fstab or empty file"));
644 guestfs___free_string_list (lines);
650 for (i = 0; lines[i] != NULL; ++i) {
651 /* Ignore comments. Only care about sequence lines which
654 if (match (g, lines[i], re_aug_seq)) {
655 snprintf (augpath, sizeof augpath, "%s/spec", lines[i]);
656 char *spec = guestfs_aug_get (g, augpath);
658 guestfs___free_string_list (lines);
662 snprintf (augpath, sizeof augpath, "%s/file", lines[i]);
663 char *mp = guestfs_aug_get (g, augpath);
665 guestfs___free_string_list (lines);
670 int r = add_fstab_entry (g, fs, spec, mp);
675 guestfs___free_string_list (lines);
681 guestfs___free_string_list (lines);
685 /* Add a filesystem and possibly a mountpoint entry for
686 * the root filesystem 'fs'.
688 * 'spec' is the fstab spec field, which might be a device name or a
689 * pseudodevice or 'UUID=...' or 'LABEL=...'.
691 * 'mp' is the mount point, which could also be 'swap' or 'none'.
694 add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
695 const char *spec, const char *mp)
697 /* Ignore certain mountpoints. */
698 if (STRPREFIX (mp, "/dev/") ||
699 STREQ (mp, "/dev") ||
700 STRPREFIX (mp, "/media/") ||
701 STRPREFIX (mp, "/proc/") ||
702 STREQ (mp, "/proc") ||
703 STRPREFIX (mp, "/selinux/") ||
704 STREQ (mp, "/selinux") ||
705 STRPREFIX (mp, "/sys/") ||
709 /* Ignore /dev/fd (floppy disks) (RHBZ#642929) and CD-ROM drives. */
710 if ((STRPREFIX (spec, "/dev/fd") && c_isdigit (spec[7])) ||
711 STREQ (spec, "/dev/floppy") ||
712 STREQ (spec, "/dev/cdrom"))
715 /* Resolve UUID= and LABEL= to the actual device. */
717 if (STRPREFIX (spec, "UUID="))
718 device = guestfs_findfs_uuid (g, &spec[5]);
719 else if (STRPREFIX (spec, "LABEL="))
720 device = guestfs_findfs_label (g, &spec[6]);
721 /* Ignore "/.swap" (Pardus) and pseudo-devices like "tmpfs". */
722 else if (STREQ (spec, "/dev/root"))
723 /* Resolve /dev/root to the current device. */
724 device = safe_strdup (g, fs->device);
725 else if (STRPREFIX (spec, "/dev/"))
726 /* Resolve guest block device names. */
727 device = resolve_fstab_device (g, spec);
729 /* If we haven't resolved the device successfully by this point,
730 * we don't care, just ignore it.
735 char *mountpoint = safe_strdup (g, mp);
737 /* Add this to the fstab entry in 'fs'.
738 * Note these are further filtered by guestfs_inspect_get_mountpoints
739 * and guestfs_inspect_get_filesystems.
741 size_t n = fs->nr_fstab + 1;
742 struct inspect_fstab_entry *p;
744 p = realloc (fs->fstab, n * sizeof (struct inspect_fstab_entry));
746 perrorf (g, "realloc");
755 /* These are owned by the handle and freed by guestfs___free_inspect_info. */
756 fs->fstab[n-1].device = device;
757 fs->fstab[n-1].mountpoint = mountpoint;
759 debug (g, "fstab: device=%s mountpoint=%s", device, mountpoint);
764 /* Resolve block device name to the libguestfs device name, eg.
765 * /dev/xvdb1 => /dev/vdb1; and /dev/mapper/VG-LV => /dev/VG/LV. This
766 * assumes that disks were added in the same order as they appear to
767 * the real VM, which is a reasonable assumption to make. Return
768 * anything we don't recognize unchanged.
771 resolve_fstab_device (guestfs_h *g, const char *spec)
775 char *bsddisk, *bsdslice, *bsdpart;
777 if (STRPREFIX (spec, "/dev/mapper/")) {
778 /* LVM2 does some strange munging on /dev/mapper paths for VGs and
779 * LVs which contain '-' character:
781 * ><fs> lvcreate LV--test VG--test 32
782 * ><fs> debug ls /dev/mapper
783 * VG----test-LV----test
785 * This makes it impossible to reverse those paths directly, so
786 * we have implemented lvm_canonical_lv_name in the daemon.
788 device = guestfs_lvm_canonical_lv_name (g, spec);
790 else if ((a1 = match1 (g, spec, re_xdev)) != NULL) {
791 char **devices = guestfs_list_devices (g);
796 for (count = 0; devices[count] != NULL; count++)
799 size_t i = a1[0] - 'a'; /* a1[0] is always [a-z] because of regex. */
801 size_t len = strlen (devices[i]) + strlen (a1) + 16;
802 device = safe_malloc (g, len);
803 snprintf (device, len, "%s%s", devices[i], &a1[1]);
807 guestfs___free_string_list (devices);
809 else if (match3 (g, spec, re_freebsd, &bsddisk, &bsdslice, &bsdpart)) {
810 /* FreeBSD disks are organized quite differently. See:
811 * http://www.freebsd.org/doc/handbook/disk-organization.html
812 * FreeBSD "partitions" are exposed as quasi-extended partitions
813 * numbered from 5 in Linux. I have no idea what happens when you
814 * have multiple "slices" (the FreeBSD term for MBR partitions).
816 int disk = guestfs___parse_unsigned_int (g, bsddisk);
817 int slice = guestfs___parse_unsigned_int (g, bsdslice);
818 int part = bsdpart[0] - 'a' /* counting from 0 */;
823 if (disk == -1 || disk > 26 ||
824 slice <= 0 || slice > 1 /* > 4 .. see comment above */ ||
825 part < 0 || part >= 26)
828 device = safe_asprintf (g, "/dev/sd%c%d", disk + 'a', part + 5);
832 /* Didn't match device pattern, return original spec unchanged. */
834 device = safe_strdup (g, spec);
839 /* Call 'f' with Augeas opened and having parsed 'filename' (this file
840 * must exist). As a security measure, this bails if the file is too
841 * large for a reasonable configuration file. After the call to 'f'
845 inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs, const char *filename,
846 int (*f) (guestfs_h *, struct inspect_fs *))
848 /* Security: Refuse to do this if filename is too large. */
849 int64_t size = guestfs_filesize (g, filename);
851 /* guestfs_filesize failed and has already set error in handle */
853 if (size > MAX_AUGEAS_FILE_SIZE) {
854 error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
859 /* If !feature_available (g, "augeas") then the next call will fail.
860 * Arguably we might want to fall back to a non-Augeas method in
863 if (guestfs_aug_init (g, "/", 16|32) == -1)
868 /* Tell Augeas to only load one file (thanks Raphaƫl Pinson). */
869 char buf[strlen (filename) + 64];
870 snprintf (buf, strlen (filename) + 64, "/augeas/load//incl[. != \"%s\"]",
872 if (guestfs_aug_rm (g, buf) == -1)
875 if (guestfs_aug_load (g) == -1)
881 guestfs_aug_close (g);
886 #endif /* defined(HAVE_HIVEX) */