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mount: make -f work even without mtab support
(Cristian Ionescu-Idbohrn <cristian.ionescu-idbohrn at axis.com>)
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@ -2449,8 +2449,10 @@ USE_FEATURE_BRCTL_FANCY("\n" \
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"Mount a filesystem. Filesystem autodetection requires /proc be mounted." \
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"\n\nOptions:\n" \
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" -a Mount all filesystems in fstab\n" \
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USE_FEATURE_MOUNT_FAKE( \
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" -f "USE_FEATURE_MTAB_SUPPORT("Update /etc/mtab, but ")"don't mount\n" \
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) \
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USE_FEATURE_MTAB_SUPPORT( \
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" -f Update /etc/mtab, but don't mount\n" \
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" -n Don't update /etc/mtab\n" \
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) \
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" -r Read-only mount\n" \
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@ -478,6 +478,7 @@ CONFIG_MOUNT=y
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# CONFIG_FEATURE_MOUNT_HELPERS is not set
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CONFIG_FEATURE_MOUNT_NFS=y
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CONFIG_FEATURE_MOUNT_CIFS=y
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CONFIG_FEATURE_MOUNT_FAKE=y
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CONFIG_FEATURE_MOUNT_FLAGS=y
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CONFIG_FEATURE_MOUNT_FSTAB=y
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CONFIG_PIVOT_ROOT=y
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@ -386,6 +386,13 @@ config MOUNT
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NFS filesystems. Most people using BusyBox will also want to enable
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the 'mount' utility.
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config FEATURE_MOUNT_FAKE
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bool "mount -f option"
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default n
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depends on MOUNT
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help
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Enable support for faking a file system mount.
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config FEATURE_MOUNT_HELPERS
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bool "Support mount helpers"
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default n
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@ -542,6 +549,7 @@ config FEATURE_MTAB_SUPPORT
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bool "Support for the old /etc/mtab file"
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default n
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depends on MOUNT || UMOUNT
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select FEATURE_MOUNT_FAKE
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help
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Historically, Unix systems kept track of the currently mounted
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partitions in the file "/etc/mtab". These days, the kernel exports
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@ -54,6 +54,35 @@ enum {
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MOUNT_NOAUTO = (1<<29),
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MOUNT_SWAP = (1<<30),
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};
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#define OPTION_STR "o:t:rwanfvsi"
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enum {
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OPT_o = (1 << 0),
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OPT_t = (1 << 1),
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OPT_r = (1 << 2),
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OPT_w = (1 << 3),
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OPT_a = (1 << 4),
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OPT_n = (1 << 5),
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OPT_f = (1 << 6),
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OPT_v = (1 << 7),
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OPT_s = (1 << 8),
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OPT_i = (1 << 9),
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};
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#if ENABLE_FEATURE_MTAB_SUPPORT
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#define useMtab (!(option_mask32 & OPT_n))
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#else
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#define useMtab 0
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#endif
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#if ENABLE_FEATURE_MOUNT_FAKE
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#define fakeIt (option_mask32 & OPT_f)
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#else
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#define fakeIt 0
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#endif
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// TODO: more "user" flag compatibility.
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// "user" option (from mount manpage):
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// Only the user that mounted a filesystem can unmount it again.
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@ -288,14 +317,6 @@ static void delete_block_backed_filesystems(void)
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void delete_block_backed_filesystems(void);
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#endif
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#if ENABLE_FEATURE_MTAB_SUPPORT
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static int useMtab = 1;
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static int fakeIt;
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#else
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#define useMtab 0
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#define fakeIt 0
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#endif
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// Perform actual mount of specific filesystem at specific location.
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// NB: mp->xxx fields may be trashed on exit
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static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
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@ -346,7 +367,7 @@ static int mount_it_now(struct mntent *mp, int vfsflags, char *filteropts)
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/* If the mount was successful, and we're maintaining an old-style
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* mtab file by hand, add the new entry to it now. */
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mtab:
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if (ENABLE_FEATURE_MTAB_SUPPORT && useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
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if (useMtab && !rc && !(vfsflags & MS_REMOUNT)) {
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char *fsname;
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FILE *mountTable = setmntent(bb_path_mtab_file, "a+");
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const char *option_str = mount_option_str;
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@ -1657,17 +1678,10 @@ int mount_main(int argc, char **argv)
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// Parse remaining options
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opt = getopt32(argv, "o:t:rwanfvsi", &opt_o, &fstype);
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if (opt & 0x1) append_mount_options(&cmdopts, opt_o); // -o
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//if (opt & 0x2) // -t
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if (opt & 0x4) append_mount_options(&cmdopts, "ro"); // -r
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if (opt & 0x8) append_mount_options(&cmdopts, "rw"); // -w
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//if (opt & 0x10) // -a
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if (opt & 0x20) USE_FEATURE_MTAB_SUPPORT(useMtab = 0); // -n
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if (opt & 0x40) USE_FEATURE_MTAB_SUPPORT(fakeIt = 1); // -f
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//if (opt & 0x80) // -v: verbose (ignore)
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//if (opt & 0x100) // -s: sloppy (ignore)
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//if (opt & 0x200) // -i: don't call mount.<fstype> (ignore)
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opt = getopt32(argv, OPTION_STR, &opt_o, &fstype);
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if (opt & OPT_o) append_mount_options(&cmdopts, opt_o); // -o
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if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
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if (opt & OPT_w) append_mount_options(&cmdopts, "rw"); // -w
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argv += optind;
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argc -= optind;
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