mount: -T OTHERTAB support
function old new delta mount_main 1221 1241 +20 packed_usage 30616 30610 -6 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> Signed-off-by: Isaac Dunham <ibid.ag@gmail.com>
This commit is contained in:
Isaac Dunham
committed by
Denys Vlasenko
Denys Vlasenko
parent
3c31b092ac
commit
7b434a67dc
@ -17,8 +17,103 @@
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// mount_it_now() does the actual mount.
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//
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//config:config MOUNT
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//config: bool "mount"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: help
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//config: All files and filesystems in Unix are arranged into one big directory
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//config: tree. The 'mount' utility is used to graft a filesystem onto a
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//config: particular part of the tree. A filesystem can either live on a block
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//config: device, or it can be accessible over the network, as is the case with
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//config: NFS filesystems. Most people using BusyBox will also want to enable
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//config: the 'mount' utility.
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//config:
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//config:config FEATURE_MOUNT_FAKE
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//config: bool "Support option -f"
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//config: default y
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//config: depends on MOUNT
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//config: help
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//config: Enable support for faking a file system mount.
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//config:
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//config:config FEATURE_MOUNT_VERBOSE
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//config: bool "Support option -v"
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//config: default y
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//config: depends on MOUNT
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//config: help
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//config: Enable multi-level -v[vv...] verbose messages. Useful if you
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//config: debug mount problems and want to see what is exactly passed
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//config: to the kernel.
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//config:
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//config:config FEATURE_MOUNT_HELPERS
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//config: bool "Support mount helpers"
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//config: default n
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//config: depends on MOUNT
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//config: help
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//config: Enable mounting of virtual file systems via external helpers.
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//config: E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
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//config: "obexfs -b00.11.22.33.44.55 /mnt"
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//config: Also "mount -t sometype [-o opts] fs /mnt" will try
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//config: "sometype [-o opts] fs /mnt" if simple mount syscall fails.
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//config: The idea is to use such virtual filesystems in /etc/fstab.
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//config:
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//config:config FEATURE_MOUNT_LABEL
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//config: bool "Support specifying devices by label or UUID"
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//config: default y
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//config: depends on MOUNT
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//config: select VOLUMEID
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//config: help
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//config: This allows for specifying a device by label or uuid, rather than by
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//config: name. This feature utilizes the same functionality as blkid/findfs.
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//config: This also enables label or uuid support for swapon.
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//config:
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//config:config FEATURE_MOUNT_NFS
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//config: bool "Support mounting NFS file systems on Linux < 2.6.23"
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//config: default n
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//config: depends on MOUNT
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//config: select FEATURE_HAVE_RPC
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//config: select FEATURE_SYSLOG
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//config: help
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//config: Enable mounting of NFS file systems on Linux kernels prior
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//config: to version 2.6.23. Note that in this case mounting of NFS
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//config: over IPv6 will not be possible.
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//config:
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//config: Note that this option links in RPC support from libc,
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//config: which is rather large (~10 kbytes on uclibc).
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//config:
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//config:config FEATURE_MOUNT_CIFS
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//config: bool "Support mounting CIFS/SMB file systems"
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//config: default y
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//config: depends on MOUNT
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//config: help
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//config: Enable support for samba mounts.
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//config:
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//config:config FEATURE_MOUNT_FLAGS
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//config: depends on MOUNT
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//config: bool "Support lots of -o flags in mount"
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//config: default y
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//config: help
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//config: Without this, mount only supports ro/rw/remount. With this, it
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//config: supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
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//config: noatime, diratime, nodiratime, loud, bind, move, shared, slave,
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//config: private, unbindable, rshared, rslave, rprivate, and runbindable.
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//config:
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//config:config FEATURE_MOUNT_FSTAB
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//config: depends on MOUNT
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//config: bool "Support /etc/fstab and -a"
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//config: default y
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//config: help
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//config: Support mount all and looking for files in /etc/fstab.
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//config:
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//config:config FEATURE_MOUNT_OTHERTAB
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//config: depends on FEATURE_MOUNT_FSTAB
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//config: bool "Support -T <alt_fstab>"
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//config: default y
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//config: help
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//config: Support mount -T (specifying an alternate fstab)
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//usage:#define mount_trivial_usage
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//usage: "[OPTIONS] [-o OPTS] DEVICE NODE"
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//usage: "[OPTIONS] [-o OPT] DEVICE NODE"
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//usage:#define mount_full_usage "\n\n"
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//usage: "Mount a filesystem. Filesystem autodetection requires /proc.\n"
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//usage: "\n -a Mount all filesystems in fstab"
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@ -41,8 +136,11 @@
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//usage: )
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////usage: "\n -s Sloppy (ignored)"
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//usage: "\n -r Read-only mount"
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//usage: "\n -w Read-write mount (default)"
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////usage: "\n -w Read-write mount (default)"
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//usage: "\n -t FSTYPE[,...] Filesystem type(s)"
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//usage: IF_FEATURE_MOUNT_OTHERTAB(
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//usage: "\n -T FILE Read FILE instead of /etc/fstab"
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//usage: )
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//usage: "\n -O OPT Mount only filesystems with option OPT (-a only)"
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//usage: "\n-o OPT:"
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//usage: IF_FEATURE_MOUNT_LOOP(
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@ -64,7 +162,7 @@
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//usage: "\n move Relocate an existing mount point"
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//usage: )
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//usage: "\n remount Remount a mounted filesystem, changing flags"
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//usage: "\n ro/rw Same as -r/-w"
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//usage: "\n ro Same as -r"
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//usage: "\n"
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//usage: "\nThere are filesystem-specific -o flags."
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//usage:
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@ -167,7 +265,7 @@ enum {
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};
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#define OPTION_STR "o:t:rwanfvsiO:"
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#define OPTION_STR "o:t:rwanfvsiO:" IF_FEATURE_MOUNT_OTHERTAB("T:")
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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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@ -180,6 +278,7 @@ enum {
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OPT_s = (1 << 8),
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OPT_i = (1 << 9),
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OPT_O = (1 << 10),
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OPT_T = (1 << 11),
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};
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#if ENABLE_FEATURE_MTAB_SUPPORT
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@ -2034,7 +2133,7 @@ int mount_main(int argc UNUSED_PARAM, char **argv)
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char *O_optmatch = NULL;
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char *storage_path;
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llist_t *lst_o = NULL;
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const char *fstabname;
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const char *fstabname = "/etc/fstab";
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FILE *fstab;
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int i, j;
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int rc = EXIT_SUCCESS;
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@ -2061,6 +2160,7 @@ int mount_main(int argc UNUSED_PARAM, char **argv)
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// Max 2 params; -o is a list, -v is a counter
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opt_complementary = "?2o::" IF_FEATURE_MOUNT_VERBOSE("vv");
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opt = getopt32(argv, OPTION_STR, &lst_o, &fstype, &O_optmatch
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IF_FEATURE_MOUNT_OTHERTAB(, &fstabname)
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IF_FEATURE_MOUNT_VERBOSE(, &verbose));
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while (lst_o) append_mount_options(&cmdopts, llist_pop(&lst_o)); // -o
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if (opt & OPT_r) append_mount_options(&cmdopts, "ro"); // -r
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@ -2128,8 +2228,10 @@ int mount_main(int argc UNUSED_PARAM, char **argv)
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return rc;
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}
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// A malicious user could overmount /usr without this.
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if (ENABLE_FEATURE_MOUNT_OTHERTAB && nonroot)
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fstabname = "/etc/fstab";
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// Open either fstab or mtab
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fstabname = "/etc/fstab";
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if (cmdopt_flags & MS_REMOUNT) {
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// WARNING. I am not sure this matches util-linux's
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// behavior. It's possible util-linux does not
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