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inspect-fs-unix.c
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inspect-fs-unix.c
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/* libguestfs
* Copyright (C) 2010-2012 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
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <errno.h>
#ifdef HAVE_ENDIAN_H
#include <endian.h>
#endif
#include <pcre.h>
#include "c-ctype.h"
#include "ignore-value.h"
#include "xstrtol.h"
#include "hash.h"
#include "hash-pjw.h"
#include "guestfs.h"
#include "guestfs-internal.h"
#include "guestfs-internal-actions.h"
#include "guestfs_protocol.h"
/* Compile all the regular expressions once when the shared library is
* loaded. PCRE is thread safe so we're supposedly OK here if
* multiple threads call into the libguestfs API functions below
* simultaneously.
*/
static pcre *re_fedora;
static pcre *re_rhel_old;
static pcre *re_rhel;
static pcre *re_rhel_no_minor;
static pcre *re_centos_old;
static pcre *re_centos;
static pcre *re_centos_no_minor;
static pcre *re_scientific_linux_old;
static pcre *re_scientific_linux;
static pcre *re_scientific_linux_no_minor;
static pcre *re_major_minor;
static pcre *re_xdev;
static pcre *re_cciss;
static pcre *re_mdN;
static pcre *re_freebsd_mbr;
static pcre *re_freebsd_gpt;
static pcre *re_diskbyid;
static pcre *re_netbsd;
static pcre *re_opensuse;
static pcre *re_sles;
static pcre *re_nld;
static pcre *re_opensuse_version;
static pcre *re_sles_version;
static pcre *re_sles_patchlevel;
static void compile_regexps (void) __attribute__((constructor));
static void free_regexps (void) __attribute__((destructor));
static void
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)
COMPILE (re_fedora, "Fedora release (\\d+)", 0);
COMPILE (re_rhel_old,
"Red Hat.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_rhel,
"Red Hat.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_rhel_no_minor,
"Red Hat.*release (\\d+)", 0);
COMPILE (re_centos_old,
"CentOS.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_centos,
"CentOS.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_centos_no_minor,
"CentOS.*release (\\d+)", 0);
COMPILE (re_scientific_linux_old,
"Scientific Linux.*release (\\d+).*Update (\\d+)", 0);
COMPILE (re_scientific_linux,
"Scientific Linux.*release (\\d+)\\.(\\d+)", 0);
COMPILE (re_scientific_linux_no_minor,
"Scientific Linux.*release (\\d+)", 0);
COMPILE (re_major_minor, "(\\d+)\\.(\\d+)", 0);
COMPILE (re_xdev, "^/dev/(h|s|v|xv)d([a-z]+)(\\d*)$", 0);
COMPILE (re_cciss, "^/dev/(cciss/c\\d+d\\d+)(?:p(\\d+))?$", 0);
COMPILE (re_mdN, "^(/dev/md\\d+)$", 0);
COMPILE (re_freebsd_mbr, "^/dev/(ada{0,1}|vtbd)(\\d+)s(\\d+)([a-z])$", 0);
COMPILE (re_freebsd_gpt, "^/dev/(ada{0,1}|vtbd)(\\d+)p(\\d+)$", 0);
COMPILE (re_diskbyid, "^/dev/disk/by-id/.*-part(\\d+)$", 0);
COMPILE (re_netbsd, "^NetBSD (\\d+)\\.(\\d+)", 0);
COMPILE (re_opensuse, "^(openSUSE|SuSE Linux|SUSE LINUX) ", 0);
COMPILE (re_sles, "^SUSE (Linux|LINUX) Enterprise ", 0);
COMPILE (re_nld, "^Novell Linux Desktop ", 0);
COMPILE (re_opensuse_version, "^VERSION = (\\d+)\\.(\\d+)", 0);
COMPILE (re_sles_version, "^VERSION = (\\d+)", 0);
COMPILE (re_sles_patchlevel, "^PATCHLEVEL = (\\d+)", 0);
}
static void
free_regexps (void)
{
pcre_free (re_fedora);
pcre_free (re_rhel_old);
pcre_free (re_rhel);
pcre_free (re_rhel_no_minor);
pcre_free (re_centos_old);
pcre_free (re_centos);
pcre_free (re_centos_no_minor);
pcre_free (re_scientific_linux_old);
pcre_free (re_scientific_linux);
pcre_free (re_scientific_linux_no_minor);
pcre_free (re_major_minor);
pcre_free (re_xdev);
pcre_free (re_cciss);
pcre_free (re_mdN);
pcre_free (re_freebsd_mbr);
pcre_free (re_freebsd_gpt);
pcre_free (re_diskbyid);
pcre_free (re_netbsd);
pcre_free (re_opensuse);
pcre_free (re_sles);
pcre_free (re_nld);
pcre_free (re_opensuse_version);
pcre_free (re_sles_version);
pcre_free (re_sles_patchlevel);
}
static void check_architecture (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_unix (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs);
static int check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs);
static int check_fstab (guestfs_h *g, struct inspect_fs *fs);
static int add_fstab_entry (guestfs_h *g, struct inspect_fs *fs,
const char *mountable, const char *mp);
static char *resolve_fstab_device (guestfs_h *g, const char *spec,
Hash_table *md_map);
static int inspect_with_augeas (guestfs_h *g, struct inspect_fs *fs, const char **configfiles, int (*f) (guestfs_h *, struct inspect_fs *));
static int is_partition (guestfs_h *g, const char *partition);
/* Hash structure for uuid->path lookups */
typedef struct md_uuid {
uint32_t uuid[4];
char *path;
} md_uuid;
static size_t uuid_hash(const void *x, size_t table_size);
static bool uuid_cmp(const void *x, const void *y);
static void md_uuid_free(void *x);
static int parse_uuid(const char *str, uint32_t *uuid);
/* Hash structure for path(mdadm)->path(appliance) lookup */
typedef struct {
char *mdadm;
char *app;
} mdadm_app;
static size_t mdadm_app_hash(const void *x, size_t table_size);
static bool mdadm_app_cmp(const void *x, const void *y);
static void mdadm_app_free(void *x);
static ssize_t map_app_md_devices (guestfs_h *g, Hash_table **map);
static int map_md_devices(guestfs_h *g, Hash_table **map);
/* Set fs->product_name to the first line of the release file. */
static int
parse_release_file (guestfs_h *g, struct inspect_fs *fs,
const char *release_filename)
{
fs->product_name = guestfs___first_line_of_file (g, release_filename);
if (fs->product_name == NULL)
return -1;
if (STREQ (fs->product_name, "")) {
free (fs->product_name);
fs->product_name = NULL;
error (g, _("release file %s is empty or malformed"), release_filename);
return -1;
}
return 0;
}
/* Ubuntu has /etc/lsb-release containing:
* DISTRIB_ID=Ubuntu # Distro
* DISTRIB_RELEASE=10.04 # Version
* DISTRIB_CODENAME=lucid
* DISTRIB_DESCRIPTION="Ubuntu 10.04.1 LTS" # Product name
*
* [Ubuntu-derived ...] Linux Mint was found to have this:
* DISTRIB_ID=LinuxMint
* DISTRIB_RELEASE=10
* DISTRIB_CODENAME=julia
* DISTRIB_DESCRIPTION="Linux Mint 10 Julia"
* Linux Mint also has /etc/linuxmint/info with more information,
* but we can use the LSB file.
*
* Mandriva has:
* LSB_VERSION=lsb-4.0-amd64:lsb-4.0-noarch
* DISTRIB_ID=MandrivaLinux
* DISTRIB_RELEASE=2010.1
* DISTRIB_CODENAME=Henry_Farman
* DISTRIB_DESCRIPTION="Mandriva Linux 2010.1"
* Mandriva also has a normal release file called /etc/mandriva-release.
*/
static int
parse_lsb_release (guestfs_h *g, struct inspect_fs *fs)
{
const char *filename = "/etc/lsb-release";
int64_t size;
CLEANUP_FREE_STRING_LIST char **lines = NULL;
size_t i;
int r = 0;
/* Don't trust guestfs_head_n not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_SMALL_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_head_n (g, 10, filename);
if (lines == NULL)
return -1;
for (i = 0; lines[i] != NULL; ++i) {
if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=Ubuntu")) {
fs->distro = OS_DISTRO_UBUNTU;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=LinuxMint")) {
fs->distro = OS_DISTRO_LINUX_MINT;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=MandrivaLinux")) {
fs->distro = OS_DISTRO_MANDRIVA;
r = 1;
}
else if (fs->distro == 0 &&
STREQ (lines[i], "DISTRIB_ID=\"Mageia\"")) {
fs->distro = OS_DISTRO_MAGEIA;
r = 1;
}
else if (STRPREFIX (lines[i], "DISTRIB_RELEASE=")) {
char *major, *minor;
if (match2 (g, &lines[i][16], re_major_minor, &major, &minor)) {
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
}
else if (fs->product_name == NULL &&
(STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=\"") ||
STRPREFIX (lines[i], "DISTRIB_DESCRIPTION='"))) {
size_t len = strlen (lines[i]) - 21 - 1;
fs->product_name = safe_strndup (g, &lines[i][21], len);
r = 1;
}
else if (fs->product_name == NULL &&
STRPREFIX (lines[i], "DISTRIB_DESCRIPTION=")) {
size_t len = strlen (lines[i]) - 20;
fs->product_name = safe_strndup (g, &lines[i][20], len);
r = 1;
}
}
/* The unnecessary construct in the next line is required to
* workaround -Wstrict-overflow warning in gcc 4.5.1.
*/
return r ? 1 : 0;
}
static int
parse_suse_release (guestfs_h *g, struct inspect_fs *fs, const char *filename)
{
int64_t size;
char *major, *minor;
CLEANUP_FREE_STRING_LIST char **lines = NULL;
int r = -1;
/* Don't trust guestfs_head_n not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_SMALL_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_head_n (g, 10, filename);
if (lines == NULL)
return -1;
if (lines[0] == NULL)
goto out;
/* First line is dist release name */
fs->product_name = safe_strdup (g, lines[0]);
/* Match SLES first because openSuSE regex overlaps some SLES release strings */
if (match (g, fs->product_name, re_sles) || match (g, fs->product_name, re_nld)) {
fs->distro = OS_DISTRO_SLES;
/* Second line contains version string */
if (lines[1] == NULL)
goto out;
major = match1 (g, lines[1], re_sles_version);
if (major == NULL)
goto out;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
goto out;
/* Third line contains service pack string */
if (lines[2] == NULL)
goto out;
minor = match1 (g, lines[2], re_sles_patchlevel);
if (minor == NULL)
goto out;
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
goto out;
}
else if (match (g, fs->product_name, re_opensuse)) {
fs->distro = OS_DISTRO_OPENSUSE;
/* Second line contains version string */
if (lines[1] == NULL)
goto out;
if (match2 (g, lines[1], re_opensuse_version, &major, &minor)) {
fs->major_version = guestfs___parse_unsigned_int (g, major);
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (major);
free (minor);
if (fs->major_version == -1 || fs->minor_version == -1)
goto out;
}
}
r = 0;
out:
return r;
}
/* The currently mounted device is known to be a Linux root. Try to
* determine from this the distro, version, etc. Also parse
* /etc/fstab to determine the arrangement of mountpoints and
* associated devices.
*/
int
guestfs___check_linux_root (guestfs_h *g, struct inspect_fs *fs)
{
int r;
fs->type = OS_TYPE_LINUX;
if (guestfs_is_file_opts (g, "/etc/lsb-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
r = parse_lsb_release (g, fs);
if (r == -1) /* error */
return -1;
if (r == 1) /* ok - detected the release from this file */
goto skip_release_checks;
}
if (guestfs_is_file_opts (g, "/etc/redhat-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_REDHAT_BASED; /* Something generic Red Hat-like. */
if (parse_release_file (g, fs, "/etc/redhat-release") == -1)
return -1;
char *major, *minor;
if ((major = match1 (g, fs->product_name, re_fedora)) != NULL) {
fs->distro = OS_DISTRO_FEDORA;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
}
else if (match2 (g, fs->product_name, re_rhel_old, &major, &minor) ||
match2 (g, fs->product_name, re_rhel, &major, &minor)) {
fs->distro = OS_DISTRO_RHEL;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_rhel_no_minor)) != NULL) {
fs->distro = OS_DISTRO_RHEL;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
else if (match2 (g, fs->product_name, re_centos_old, &major, &minor) ||
match2 (g, fs->product_name, re_centos, &major, &minor)) {
fs->distro = OS_DISTRO_CENTOS;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_centos_no_minor)) != NULL) {
fs->distro = OS_DISTRO_CENTOS;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
else if (match2 (g, fs->product_name, re_scientific_linux_old, &major, &minor) ||
match2 (g, fs->product_name, re_scientific_linux, &major, &minor)) {
fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
else if ((major = match1 (g, fs->product_name, re_scientific_linux_no_minor)) != NULL) {
fs->distro = OS_DISTRO_SCIENTIFIC_LINUX;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1)
return -1;
fs->minor_version = 0;
}
}
else if (guestfs_is_file_opts (g, "/etc/debian_version",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_DEBIAN;
if (parse_release_file (g, fs, "/etc/debian_version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/pardus-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_PARDUS;
if (parse_release_file (g, fs, "/etc/pardus-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/arch-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_ARCHLINUX;
/* /etc/arch-release file is empty and I can't see a way to
* determine the actual release or product string.
*/
}
else if (guestfs_is_file_opts (g, "/etc/gentoo-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_GENTOO;
if (parse_release_file (g, fs, "/etc/gentoo-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/meego-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_MEEGO;
if (parse_release_file (g, fs, "/etc/meego-release") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/slackware-version",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_SLACKWARE;
if (parse_release_file (g, fs, "/etc/slackware-version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/ttylinux-target",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_TTYLINUX;
if (parse_release_file (g, fs, "/etc/ttylinux-target") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
else if (guestfs_is_file_opts (g, "/etc/SuSE-release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_SUSE_BASED;
if (parse_suse_release (g, fs, "/etc/SuSE-release") == -1)
return -1;
}
/* CirrOS versions providing a own version file.
*/
else if (guestfs_is_file_opts (g, "/etc/cirros/version",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_CIRROS;
if (parse_release_file (g, fs, "/etc/cirros/version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Buildroot (http://buildroot.net) is an embedded Linux distro
* toolkit. It is used by specific distros such as Cirros.
*/
else if (guestfs_is_file_opts (g, "/etc/br-version",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
if (guestfs_is_file_opts (g, "/usr/share/cirros/logo",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0)
fs->distro = OS_DISTRO_CIRROS;
else
fs->distro = OS_DISTRO_BUILDROOT;
/* /etc/br-version has the format YYYY.MM[-git/hg/svn release] */
if (parse_release_file (g, fs, "/etc/br-version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
skip_release_checks:;
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test
* for Linux root above. We must now parse this file to determine
* which filesystems are used by the operating system and how they
* are mounted.
*/
const char *configfiles[] = { "/etc/fstab", "/etc/mdadm.conf", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device is known to be a FreeBSD root. */
int
guestfs___check_freebsd_root (guestfs_h *g, struct inspect_fs *fs)
{
fs->type = OS_TYPE_FREEBSD;
/* FreeBSD has no authoritative version file. The version number is
* in /etc/motd, which the system administrator might edit, but
* we'll use that anyway.
*/
if (guestfs_is_file_opts (g, "/etc/motd",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
if (parse_release_file (g, fs, "/etc/motd") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test above. */
const char *configfiles[] = { "/etc/fstab", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device is maybe to be a *BSD root. */
int
guestfs___check_netbsd_root (guestfs_h *g, struct inspect_fs *fs)
{
if (guestfs_is_file_opts (g, "/etc/release",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
char *major, *minor;
if (parse_release_file (g, fs, "/etc/release") == -1)
return -1;
if (match2 (g, fs->product_name, re_netbsd, &major, &minor)) {
fs->type = OS_TYPE_NETBSD;
fs->major_version = guestfs___parse_unsigned_int (g, major);
free (major);
if (fs->major_version == -1) {
free (minor);
return -1;
}
fs->minor_version = guestfs___parse_unsigned_int (g, minor);
free (minor);
if (fs->minor_version == -1)
return -1;
}
} else {
return -1;
}
/* Determine the architecture. */
check_architecture (g, fs);
/* We already know /etc/fstab exists because it's part of the test above. */
const char *configfiles[] = { "/etc/fstab", NULL };
if (inspect_with_augeas (g, fs, configfiles, check_fstab) == -1)
return -1;
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
/* The currently mounted device may be a Hurd root. Hurd has distros
* just like Linux.
*/
int
guestfs___check_hurd_root (guestfs_h *g, struct inspect_fs *fs)
{
fs->type = OS_TYPE_HURD;
if (guestfs_is_file_opts (g, "/etc/debian_version",
GUESTFS_IS_FILE_OPTS_FOLLOWSYMLINKS, 1, -1) > 0) {
fs->distro = OS_DISTRO_DEBIAN;
if (parse_release_file (g, fs, "/etc/debian_version") == -1)
return -1;
if (guestfs___parse_major_minor (g, fs) == -1)
return -1;
}
/* Arch Hurd also exists, but inconveniently it doesn't have
* the normal /etc/arch-release file. XXX
*/
/* Determine the architecture. */
check_architecture (g, fs);
/* XXX Check for /etc/fstab. */
/* Determine hostname. */
if (check_hostname_unix (g, fs) == -1)
return -1;
return 0;
}
static void
check_architecture (guestfs_h *g, struct inspect_fs *fs)
{
const char *binaries[] =
{ "/bin/bash", "/bin/ls", "/bin/echo", "/bin/rm", "/bin/sh" };
size_t i;
char *arch;
for (i = 0; i < sizeof binaries / sizeof binaries[0]; ++i) {
if (guestfs_is_file (g, binaries[i]) > 0) {
/* Ignore errors from file_architecture call. */
guestfs_push_error_handler (g, NULL, NULL);
arch = guestfs_file_architecture (g, binaries[i]);
guestfs_pop_error_handler (g);
if (arch) {
/* String will be owned by handle, freed by
* guestfs___free_inspect_info.
*/
fs->arch = arch;
break;
}
}
}
}
/* Try several methods to determine the hostname from a Linux or
* FreeBSD guest. Note that type and distro have been set, so we can
* use that information to direct the search.
*/
static int
check_hostname_unix (guestfs_h *g, struct inspect_fs *fs)
{
switch (fs->type) {
case OS_TYPE_LINUX:
case OS_TYPE_HURD:
/* Red Hat-derived would be in /etc/sysconfig/network or
* /etc/hostname (RHEL 7+, F18+). Debian-derived in the file
* /etc/hostname. Very old Debian and SUSE use /etc/HOSTNAME.
* It's best to just look for each of these files in turn, rather
* than try anything clever based on distro.
*/
if (guestfs_is_file (g, "/etc/HOSTNAME")) {
fs->hostname = guestfs___first_line_of_file (g, "/etc/HOSTNAME");
if (fs->hostname == NULL)
return -1;
if (STREQ (fs->hostname, "")) {
free (fs->hostname);
fs->hostname = NULL;
}
}
if (!fs->hostname && guestfs_is_file (g, "/etc/hostname")) {
fs->hostname = guestfs___first_line_of_file (g, "/etc/hostname");
if (fs->hostname == NULL)
return -1;
if (STREQ (fs->hostname, "")) {
free (fs->hostname);
fs->hostname = NULL;
}
}
if (!fs->hostname && guestfs_is_file (g, "/etc/sysconfig/network")) {
const char *configfiles[] = { "/etc/sysconfig/network", NULL };
if (inspect_with_augeas (g, fs, configfiles,
check_hostname_redhat) == -1)
return -1;
}
break;
case OS_TYPE_FREEBSD:
case OS_TYPE_NETBSD:
/* /etc/rc.conf contains the hostname, but there is no Augeas lens
* for this file.
*/
if (guestfs_is_file (g, "/etc/rc.conf")) {
if (check_hostname_freebsd (g, fs) == -1)
return -1;
}
break;
case OS_TYPE_WINDOWS: /* not here, see check_windows_system_registry */
case OS_TYPE_DOS:
case OS_TYPE_OPENBSD:
case OS_TYPE_UNKNOWN:
/* nothing */;
}
return 0;
}
/* Parse the hostname from /etc/sysconfig/network. This must be
* called from the inspect_with_augeas wrapper. Note that F18+ and
* RHEL7+ use /etc/hostname just like Debian.
*/
static int
check_hostname_redhat (guestfs_h *g, struct inspect_fs *fs)
{
char *hostname;
/* Errors here are not fatal (RHBZ#726739), since it could be
* just missing HOSTNAME field in the file.
*/
guestfs_push_error_handler (g, NULL, NULL);
hostname = guestfs_aug_get (g, "/files/etc/sysconfig/network/HOSTNAME");
guestfs_pop_error_handler (g);
/* This is freed by guestfs___free_inspect_info. Note that hostname
* could be NULL because we ignored errors above.
*/
fs->hostname = hostname;
return 0;
}
/* Parse the hostname from /etc/rc.conf. On FreeBSD this file
* contains comments, blank lines and:
* hostname="freebsd8.example.com"
* ifconfig_re0="DHCP"
* keymap="uk.iso"
* sshd_enable="YES"
*/
static int
check_hostname_freebsd (guestfs_h *g, struct inspect_fs *fs)
{
const char *filename = "/etc/rc.conf";
int64_t size;
CLEANUP_FREE_STRING_LIST char **lines = NULL;
size_t i;
/* Don't trust guestfs_read_lines not to break with very large files.
* Check the file size is something reasonable first.
*/
size = guestfs_filesize (g, filename);
if (size == -1)
/* guestfs_filesize failed and has already set error in handle */
return -1;
if (size > MAX_SMALL_FILE_SIZE) {
error (g, _("size of %s is unreasonably large (%" PRIi64 " bytes)"),
filename, size);
return -1;
}
lines = guestfs_read_lines (g, filename);
if (lines == NULL)
return -1;
for (i = 0; lines[i] != NULL; ++i) {
if (STRPREFIX (lines[i], "hostname=\"") ||
STRPREFIX (lines[i], "hostname='")) {
size_t len = strlen (lines[i]) - 10 - 1;
fs->hostname = safe_strndup (g, &lines[i][10], len);
break;
} else if (STRPREFIX (lines[i], "hostname=")) {
size_t len = strlen (lines[i]) - 9;
fs->hostname = safe_strndup (g, &lines[i][9], len);
break;
}
}
return 0;
}
static int
check_fstab (guestfs_h *g, struct inspect_fs *fs)
{
CLEANUP_FREE_STRING_LIST char **entries = NULL;
char **entry;
char augpath[256];
CLEANUP_HASH_FREE Hash_table *md_map = NULL;
/* Generate a map of MD device paths listed in /etc/mdadm.conf to MD device
* paths in the guestfs appliance */
if (map_md_devices (g, &md_map) == -1) return -1;
entries = guestfs_aug_match (g, "/files/etc/fstab/*[label() != '#comment']");
if (entries == NULL)
return -1;
if (entries[0] == NULL) {
error (g, _("could not parse /etc/fstab or empty file"));
return -1;
}
for (entry = entries; *entry != NULL; entry++) {
snprintf (augpath, sizeof augpath, "%s/spec", *entry);
CLEANUP_FREE char *spec = guestfs_aug_get (g, augpath);
if (spec == NULL)
return -1;
/* Ignore /dev/fd (floppy disks) (RHBZ#642929) and CD-ROM drives. */
if ((STRPREFIX (spec, "/dev/fd") && c_isdigit (spec[7])) ||
STREQ (spec, "/dev/floppy") ||
STREQ (spec, "/dev/cdrom"))
continue;
snprintf (augpath, sizeof augpath, "%s/file", *entry);
CLEANUP_FREE char *mp = guestfs_aug_get (g, augpath);
if (mp == NULL)
return -1;
/* Ignore certain mountpoints. */
if (STRPREFIX (mp, "/dev/") ||
STREQ (mp, "/dev") ||
STRPREFIX (mp, "/media/") ||
STRPREFIX (mp, "/proc/") ||
STREQ (mp, "/proc") ||
STRPREFIX (mp, "/selinux/") ||
STREQ (mp, "/selinux") ||
STRPREFIX (mp, "/sys/") ||
STREQ (mp, "/sys"))
continue;
/* Resolve UUID= and LABEL= to the actual device. */
CLEANUP_FREE char *mountable = NULL;
if (STRPREFIX (spec, "UUID="))
mountable = guestfs_findfs_uuid (g, &spec[5]);
else if (STRPREFIX (spec, "LABEL="))
mountable = guestfs_findfs_label (g, &spec[6]);
/* Ignore "/.swap" (Pardus) and pseudo-devices like "tmpfs". */
else if (STREQ (spec, "/dev/root"))
/* Resolve /dev/root to the current device. */
mountable = safe_strdup (g, fs->mountable);
else if (STRPREFIX (spec, "/dev/"))
/* Resolve guest block device names. */
mountable = resolve_fstab_device (g, spec, md_map);
/* If we haven't resolved the device successfully by this point,
* we don't care, just ignore it.
*/
if (mountable == NULL)
continue;
snprintf (augpath, sizeof augpath, "%s/vfstype", *entry);
CLEANUP_FREE char *vfstype = guestfs_aug_get (g, augpath);
if (vfstype == NULL) return -1;
if (STREQ (vfstype, "btrfs")) {
snprintf (augpath, sizeof augpath, "%s/opt", *entry);
CLEANUP_FREE_STRING_LIST char **opts = guestfs_aug_match (g, augpath);
if (opts == NULL) return -1;
for (char **opt = opts; *opt; opt++) {
CLEANUP_FREE char *optname = guestfs_aug_get (g, augpath);
if (optname == NULL) return -1;
if (STREQ (optname, "subvol")) {
snprintf (augpath, sizeof augpath, "%s/value", *opt);
CLEANUP_FREE char *subvol = guestfs_aug_get (g, augpath);
if (subvol == NULL) return -1;
char *new = safe_asprintf (g, "btrfsvol:%s/%s", mountable, subvol);
free (mountable);
mountable = new;
}
}
}
if (add_fstab_entry (g, fs, mountable, mp) == -1) return -1;
}