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mount: support -i; pass through -f and -n to helpers as necessary

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function                                             old     new   delta
mount_it_now                                         298     345     +47
singlemount                                          776     772      -4

Signed-off-by: Colin Watson <cjwatson@ubuntu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-06-19 11:48:29 +02:00
parent b96159d663
commit e2e4cc249d
2 changed files with 49 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/usage.h
View File

@ -2900,6 +2900,9 @@
IF_NOT_FEATURE_MTAB_SUPPORT( \
"\n -f Dry run" \
) \
) \
IF_FEATURE_MOUNT_HELPERS( \
"\n -i Don't run mount helper" \
) \
IF_FEATURE_MTAB_SUPPORT( \
"\n -n Don't update /etc/mtab" \

73
util-linux/mount.c
View File

@ -79,15 +79,21 @@ enum {
};
#if ENABLE_FEATURE_MTAB_SUPPORT
#define useMtab (!(option_mask32 & OPT_n))
#define USE_MTAB (!(option_mask32 & OPT_n))
#else
#define useMtab 0
#define USE_MTAB 0
#endif
#if ENABLE_FEATURE_MOUNT_FAKE
#define fakeIt (option_mask32 & OPT_f)
#define FAKE_IT (option_mask32 & OPT_f)
#else
#define fakeIt 0
#define FAKE_IT 0
#endif
#if ENABLE_FEATURE_MOUNT_HELPERS
#define HELPERS_ALLOWED (!(option_mask32 & OPT_i))
#else
#define HELPERS_ALLOWED 0
#endif
@ -360,7 +366,7 @@ static llist_t *get_block_backed_filesystems(void)
"/proc/filesystems",
};
char *fs, *buf;
llist_t *list = 0;
llist_t *list = NULL;
int i;
FILE *f;
@ -369,10 +375,11 @@ static llist_t *get_block_backed_filesystems(void)
if (!f) continue;
while ((buf = xmalloc_fgetline(f)) != NULL) {
if (!strncmp(buf, "nodev", 5) && isspace(buf[5]))
if (strncmp(buf, "nodev", 5) == 0 && isspace(buf[5]))
continue;
fs = skip_whitespace(buf);
if (*fs=='#' || *fs=='*' || !*fs) continue;
if (*fs == '#' || *fs == '*' || !*fs)
continue;
llist_add_to_end(&list, xstrdup(fs));
free(buf);
@ -398,7 +405,7 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
{
int rc = 0;
if (fakeIt) {
if (FAKE_IT) {
if (verbose >= 2)
bb_error_msg("would do mount('%s','%s','%s',0x%08lx,'%s')",
mp->mnt_fsname, mp->mnt_dir, mp->mnt_type,
@ -414,11 +421,15 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
// If mount failed, try
// helper program mount.<mnt_type>
if (ENABLE_FEATURE_MOUNT_HELPERS && rc) {
char *args[6];
if (HELPERS_ALLOWED && rc) {
char *args[8];
int errno_save = errno;
args[0] = xasprintf("mount.%s", mp->mnt_type);
rc = 1;
if (FAKE_IT)
args[rc++] = (char *)"-f";
if (ENABLE_FEATURE_MTAB_SUPPORT && !USE_MTAB)
args[rc++] = (char *)"-n";
args[rc++] = mp->mnt_fsname;
args[rc++] = mp->mnt_dir;
if (filteropts) {
@ -449,7 +460,7 @@ static int mount_it_now(struct mntent *mp, long vfsflags, char *filteropts)
// If the mount was successful, and we're maintaining an old-style
// mtab file by hand, add the new entry to it now.
mtab:
if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
if (USE_MTAB && !rc && !(vfsflags & MS_REMOUNT)) {
char *fsname;
FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
const char *option_str = mount_option_str;
@ -1570,8 +1581,8 @@ static int singlemount(struct mntent *mp, int ignore_busy)
{
int rc = -1;
long vfsflags;
char *loopFile = 0, *filteropts = 0;
llist_t *fl = 0;
char *loopFile = NULL, *filteropts = NULL;
llist_t *fl = NULL;
struct stat st;
vfsflags = parse_mount_options(mp->mnt_opts, &filteropts);
@ -1581,21 +1592,28 @@ static int singlemount(struct mntent *mp, int ignore_busy)
mp->mnt_type = NULL;
// Might this be a virtual filesystem?
if (ENABLE_FEATURE_MOUNT_HELPERS
&& (strchr(mp->mnt_fsname, '#'))
) {
char *s, *p, *args[35];
int n = 0;
// FIXME: does it allow execution of arbitrary commands?!
// What args[0] can end up with?
for (s = p = mp->mnt_fsname; *s && n < 35-3; ++s) {
if (s[0] == '#' && s[1] != '#') {
*s = '\0';
args[n++] = p;
p = s + 1;
if (ENABLE_FEATURE_MOUNT_HELPERS && strchr(mp->mnt_fsname, '#')) {
char *args[35];
char *s;
int n;
// fsname: "cmd#arg1#arg2..."
// WARNING: allows execution of arbitrary commands!
// Try "mount 'sh#-c#sh' bogus_dir".
// It is safe ONLY because non-root
// cannot use two-argument mount command
// and using one-argument "mount 'sh#-c#sh'" doesn't work:
// "mount: can't find sh#-c#sh in /etc/fstab"
// (if /etc/fstab has it, it's ok: root sets up /etc/fstab).
s = mp->mnt_fsname;
n = 0;
args[n++] = s;
while (*s && n < 35 - 2) {
if (*s++ == '#' && *s != '#') {
s[-1] = '\0';
args[n++] = s;
}
}
args[n++] = p;
args[n++] = mp->mnt_dir;
args[n] = NULL;
rc = wait4pid(xspawn(args));
@ -1704,7 +1722,8 @@ static int singlemount(struct mntent *mp, int ignore_busy)
for (fl = fslist; fl; fl = fl->link) {
mp->mnt_type = fl->data;
rc = mount_it_now(mp, vfsflags, filteropts);
if (!rc) break;
if (!rc)
break;
}
}