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author | Karel Zak | 2012-01-11 17:05:08 +0100 |
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committer | Karel Zak | 2012-01-11 17:05:08 +0100 |
commit | ecdba5ddfc99815181db1e5d571ea8e2b806c0f9 (patch) | |
tree | c28a9b435950b164dea72b39916e393adfb36c7b /sys-utils/mount.c | |
parent | libmount: add --pass-fd to samples/mount (diff) | |
download | kernel-qcow2-util-linux-ecdba5ddfc99815181db1e5d571ea8e2b806c0f9.tar.gz kernel-qcow2-util-linux-ecdba5ddfc99815181db1e5d571ea8e2b806c0f9.tar.xz kernel-qcow2-util-linux-ecdba5ddfc99815181db1e5d571ea8e2b806c0f9.zip |
build-sys: add --enable-new-mount
Now we have three versions of the mount(8) utility
* old mount(8)
--enable-mount [default]
* old mount(8) linked with libmount
This is this is necessary for systems without mtab file.
--enable-libmount-mount
- new mount(8)
This is completely new pure-libmount based mount(8).
--enable-new-mount
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/mount.c')
-rw-r--r-- | sys-utils/mount.c | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/sys-utils/mount.c b/sys-utils/mount.c new file mode 100644 index 000000000..cdd70b8f6 --- /dev/null +++ b/sys-utils/mount.c @@ -0,0 +1,543 @@ +/* + * mount(8) -- mount a filesystem + * + * Copyright (C) 2011 Red Hat, Inc. All rights reserved. + * Written by Karel Zak <kzak@redhat.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <string.h> +#include <getopt.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/mman.h> + +#include <libmount.h> + +#include "nls.h" +#include "c.h" +#include "env.h" +#include "optutils.h" +#include "strutils.h" +#include "xgetpass.h" + +/*** TODO: DOCS: + * + * --guess-fstype is unsupported + */ + +/* exit status */ +#define EX_SUCCESS 0 +#define EX_USAGE 1 /* incorrect invocation or permission */ +#define EX_SYSERR 2 /* out of memory, cannot fork, ... */ +#define EX_SOFTWARE 4 /* internal mount bug or wrong version */ +#define EX_USER 8 /* user interrupt */ +#define EX_FILEIO 16 /* problems writing, locking, ... mtab/fstab */ +#define EX_FAIL 32 /* mount failure */ +#define EX_SOMEOK 64 /* some mount succeeded */ + +static int passfd = -1; + +static void __attribute__((__noreturn__)) exit_non_root(const char *option) +{ + const uid_t ruid = getuid(); + const uid_t euid = geteuid(); + + if (ruid == 0 && euid != 0) { + /* user is root, but setuid to non-root */ + if (option) + errx(EX_USAGE, _("only root can use \"--%s\" option " + "(effective UID is %u)"), + option, euid); + errx(EX_USAGE, _("only root can do that " + "(effective UID is %u)"), euid); + } + if (option) + errx(EX_USAGE, _("only root can use \"--%s\" option"), option); + errx(EX_USAGE, _("only root can do that")); +} + +static void __attribute__((__noreturn__)) print_version(void) +{ + const char *ver = NULL; + + mnt_get_library_version(&ver); + + printf(_("%s from %s (libmount %s)\n"), + program_invocation_short_name, PACKAGE_STRING, ver); + exit(EX_SUCCESS); +} + +static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)), + const char *filename, int line) +{ + if (filename) + warnx(_("%s: parse error: ignore entry at line %d."), + filename, line); + return 0; +} + +static char *encrypt_pass_get(struct libmnt_context *cxt) +{ + if (!cxt) + return 0; + +#ifdef MCL_FUTURE + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { + warn(_("couldn't lock into memory")); + return NULL; + } +#endif + return xgetpass(passfd, _("Password: ")); +} + +static void encrypt_pass_release(struct libmnt_context *cxt, char *pwd) +{ + char *p = pwd; + + while (p && *p) + *p++ = '\0'; + + free(pwd); + munlockall(); +} + +static void print_all(struct libmnt_context *cxt, char *pattern, int show_label) +{ + struct libmnt_table *tb; + struct libmnt_iter *itr = NULL; + struct libmnt_fs *fs; + struct libmnt_cache *cache = NULL; + + if (mnt_context_get_mtab(cxt, &tb)) + err(EX_SYSERR, _("failed to read mtab")); + + itr = mnt_new_iter(MNT_ITER_FORWARD); + if (!itr) + err(EX_SYSERR, _("failed to initialize libmount iterator")); + if (show_label) + cache = mnt_new_cache(); + + while (mnt_table_next_fs(tb, itr, &fs) == 0) { + const char *type = mnt_fs_get_fstype(fs); + const char *src = mnt_fs_get_source(fs); + const char *optstr = mnt_fs_get_options(fs); + char *xsrc; + + if (type && pattern && !mnt_match_fstype(type, pattern)) + continue; + + xsrc = mnt_pretty_path(src, cache); + printf ("%s on %s", xsrc, mnt_fs_get_target(fs)); + if (type) + printf (" type %s", type); + if (optstr) + printf (" (%s)", optstr); + if (show_label && src) { + char *lb = mnt_cache_find_tag_value(cache, src, "LABEL"); + if (lb) + printf (" [%s]", lb); + } + fputc('\n', stdout); + free(xsrc); + } + + mnt_free_cache(cache); + mnt_free_iter(itr); +} + +/* + * mount -a [-F] + */ +static int mount_all(struct libmnt_context *cxt) +{ + struct libmnt_iter *itr; + struct libmnt_fs *fs; + int mntrc, ignored, rc = EX_SUCCESS; + + itr = mnt_new_iter(MNT_ITER_FORWARD); + if (!itr) { + warn(_("failed to initialize libmount iterator")); + return EX_SYSERR; + } + + while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) { + + const char *tgt = mnt_fs_get_target(fs); + + if (ignored) { + if (mnt_context_is_verbose(cxt)) + printf(ignored == 1 ? _("%-25s: ignored\n") : + _("%-25s: already mounted\n"), + tgt); + + } else if (mnt_context_is_fork(cxt)) { + printf("%-25s: mount successfully forked\n", tgt); + + } else { + if (!mnt_context_get_status(cxt)) { + if (mntrc > 0) { + errno = mntrc; + printf(_("%-25s: failed: %s\n"), tgt, + strerror(mntrc)); + rc |= EX_FAIL; + } else { + printf(_("%-25s: failed\n"), tgt); + rc |= EX_SYSERR; + } + } else { + if (mnt_context_is_verbose(cxt)) + printf("%-25s: successfully mounted\n", tgt); + + rc |= EX_SOMEOK; + } + } + } + + if (mnt_context_is_parent(cxt)) { + /* wait for mount --fork children */ + int nerrs = 0, nchildren = 0; + + rc = mnt_context_wait_for_children(cxt, &nchildren, &nerrs); + if (!rc && nchildren) + rc = nchildren == nerrs ? EX_FAIL : EX_SOMEOK; + } + + return rc; +} + +static void __attribute__((__noreturn__)) usage(FILE *out) +{ + fputs(USAGE_HEADER, out); + fprintf(out, _( + " %1$s [-lhV]\n" + " %1$s -a [options]\n" + " %1$s [options] <source> | <directory>\n" + " %1$s [options] <source> <directory>\n" + " %1$s <operation> <mountpoint> [<target>]\n"), + program_invocation_short_name); + + fputs(USAGE_OPTIONS, out); + fprintf(out, _( + " -a, --all mount all filesystems mentioned in fstab\n" + " -c, --no-canonicalize don't canonicalize paths\n" + " -f, --fake dry run; skip the mount(2) syscall\n" + " -F, --fork fork off for each device (use with -a)\n")); + fprintf(out, _( + " -h, --help display this help text and exit\n" + " -i, --internal-only don't call the mount.<type> helpers\n" + " -l, --show-labels lists all mounts with LABELs\n" + " -n, --no-mtab don't write to /etc/mtab\n")); + fprintf(out, _( + " -o, --options <list> comma-separated list of mount options\n" + " -O, --test-opts <list> limit the set of filesystems (use with -a)\n" + " -p, --pass-fd <num> read the passphrase from file descriptor\n" + " -r, --read-only mount the filesystem read-only (same as -o ro)\n" + " -t, --types <list> limit the set of filesystem types\n")); + fprintf(out, _( + " -v, --verbose say what is being done\n" + " -V, --version display version information and exit\n" + " -w, --read-write mount the filesystem read-write (default)\n")); + + fputs(USAGE_SEPARATOR, out); + fputs(USAGE_HELP, out); + fputs(USAGE_VERSION, out); + + fprintf(out, _( + "\nSource:\n" + " -L, --label <label> synonym for LABEL=<label>\n" + " -U, --uuid <uuid> synonym for UUID=<uuid>\n" + " LABEL=<label> specifies device by filesystem label\n" + " UUID=<uuid> specifies device by filesystem UUID\n")); + fprintf(out, _( + " <device> specifies device by path\n" + " <directory> mountpoint for bind mounts (see --bind/rbind)\n" + " <file> regular file for loopdev setup\n")); + + fprintf(out, _( + "\nOperations:\n" + " -B, --bind mount a subtree somewhere else (same as -o bind)\n" + " -M, --move move a subtree to some other place\n" + " -R, --rbind mount a subtree and all submounts somewhere else\n")); + fprintf(out, _( + " --make-shared mark a subtree as shared\n" + " --make-slave mark a subtree as slave\n" + " --make-private mark a subtree as private\n" + " --make-unbindable mark a subtree as unbindable\n")); + fprintf(out, _( + " --make-rshared recursively mark a whole subtree as shared\n" + " --make-rslave recursively mark a whole subtree as slave\n" + " --make-rprivate recursively mark a whole subtree as private\n" + " --make-runbindable recursively mark a whole subtree as unbindable\n")); + + fprintf(out, USAGE_MAN_TAIL("mount(8)")); + + exit(out == stderr ? EX_USAGE : EX_SUCCESS); +} + +int main(int argc, char **argv) +{ + int c, rc = EX_SUCCESS, all = 0, show_labels = 0; + struct libmnt_context *cxt; + char *source = NULL, *srcbuf = NULL; + char *types = NULL; + unsigned long oper = 0; + + enum { + MOUNT_OPT_SHARED = CHAR_MAX + 1, + MOUNT_OPT_SLAVE, + MOUNT_OPT_PRIVATE, + MOUNT_OPT_UNBINDABLE, + MOUNT_OPT_RSHARED, + MOUNT_OPT_RSLAVE, + MOUNT_OPT_RPRIVATE, + MOUNT_OPT_RUNBINDABLE + }; + + static const struct option longopts[] = { + { "all", 0, 0, 'a' }, + { "fake", 0, 0, 'f' }, + { "fork", 0, 0, 'F' }, + { "help", 0, 0, 'h' }, + { "no-mtab", 0, 0, 'n' }, + { "read-only", 0, 0, 'r' }, + { "ro", 0, 0, 'r' }, + { "verbose", 0, 0, 'v' }, + { "version", 0, 0, 'V' }, + { "read-write", 0, 0, 'w' }, + { "rw", 0, 0, 'w' }, + { "options", 1, 0, 'o' }, + { "test-opts", 1, 0, 'O' }, + { "pass-fd", 1, 0, 'p' }, + { "types", 1, 0, 't' }, + { "uuid", 1, 0, 'U' }, + { "label", 1, 0, 'L'}, + { "bind", 0, 0, 'B' }, + { "move", 0, 0, 'M' }, + { "rbind", 0, 0, 'R' }, + { "make-shared", 0, 0, MOUNT_OPT_SHARED }, + { "make-slave", 0, 0, MOUNT_OPT_SLAVE }, + { "make-private", 0, 0, MOUNT_OPT_PRIVATE }, + { "make-unbindable", 0, 0, MOUNT_OPT_UNBINDABLE }, + { "make-rshared", 0, 0, MOUNT_OPT_RSHARED }, + { "make-rslave", 0, 0, MOUNT_OPT_RSLAVE }, + { "make-rprivate", 0, 0, MOUNT_OPT_RPRIVATE }, + { "make-runbindable", 0, 0, MOUNT_OPT_RUNBINDABLE }, + { "no-canonicalize", 0, 0, 'c' }, + { "internal-only", 0, 0, 'i' }, + { "show-labels", 0, 0, 'l' }, + { NULL, 0, 0, 0 } + }; + + sanitize_env(); + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + + mnt_init_debug(0); + cxt = mnt_new_context(); + if (!cxt) + err(EX_SYSERR, _("libmount context allocation failed")); + + mnt_context_set_tables_errcb(cxt, table_parser_errcb); + + while ((c = getopt_long(argc, argv, "aBcfFhilL:Mno:O:p:rRsU:vVwt:", + longopts, NULL)) != -1) { + + /* only few options are allowed for non-root users */ + if (mnt_context_is_restricted(cxt) && !strchr("hlLUVvp", c)) + exit_non_root(option_to_longopt(c, longopts)); + + switch(c) { + case 'a': + all = 1; + break; + case 'c': + mnt_context_disable_canonicalize(cxt, TRUE); + break; + case 'f': + mnt_context_enable_fake(cxt, TRUE); + break; + case 'F': + mnt_context_enable_fork(cxt, TRUE); + break; + case 'h': + usage(stdout); + break; + case 'i': + mnt_context_disable_helpers(cxt, TRUE); + break; + case 'n': + mnt_context_disable_mtab(cxt, TRUE); + break; + case 'r': + if (mnt_context_append_options(cxt, "ro")) + err(EX_SYSERR, _("failed to append options")); + break; + case 'v': + mnt_context_enable_verbose(cxt, TRUE); + break; + case 'V': + print_version(); + break; + case 'w': + if (mnt_context_append_options(cxt, "rw")) + err(EX_SYSERR, _("failed to append options")); + break; + case 'o': + if (mnt_context_append_options(cxt, optarg)) + err(EX_SYSERR, _("failed to append options")); + break; + case 'O': + if (mnt_context_set_options_pattern(cxt, optarg)) + err(EX_SYSERR, _("failed to set options pattern")); + break; + case 'p': + passfd = strtol_or_err(optarg, + _("invalid passphrase file descriptor")); + break; + case 'L': + case 'U': + if (source) + errx(EX_USAGE, _("only one <source> may be specified")); + if (asprintf(&srcbuf, "%s=\"%s\"", + c == 'L' ? "LABEL" : "UUID", optarg) <= 0) + err(EX_SYSERR, _("failed to allocate source buffer")); + source = srcbuf; + break; + case 'l': + show_labels = 1; + break; + case 't': + types = optarg; + break; + case 's': + mnt_context_enable_sloppy(cxt, TRUE); + break; + case 'B': + oper = MS_BIND; + break; + case 'M': + oper = MS_MOVE; + break; + case 'R': + oper = (MS_BIND | MS_REC); + break; + case MOUNT_OPT_SHARED: + oper = MS_SHARED; + break; + case MOUNT_OPT_SLAVE: + oper = MS_SLAVE; + break; + case MOUNT_OPT_PRIVATE: + oper = MS_PRIVATE; + break; + case MOUNT_OPT_UNBINDABLE: + oper = MS_UNBINDABLE; + break; + case MOUNT_OPT_RSHARED: + oper = (MS_SHARED | MS_REC); + break; + case MOUNT_OPT_RSLAVE: + oper = (MS_SLAVE | MS_REC); + break; + case MOUNT_OPT_RPRIVATE: + oper = (MS_PRIVATE | MS_REC); + break; + case MOUNT_OPT_RUNBINDABLE: + oper = (MS_UNBINDABLE | MS_REC); + break; + default: + usage(stderr); + break; + } + } + + argc -= optind; + argv += optind; + + if (!source && !argc && !all) { + if (oper) + usage(stderr); + print_all(cxt, types, show_labels); + goto done; + } + + if (oper && (types || all || source)) + usage(stderr); + + if (types && (all || strchr(types, ',') || + strncmp(types, "no", 2) == 0)) + mnt_context_set_fstype_pattern(cxt, types); + else if (types) + mnt_context_set_fstype(cxt, types); + + mnt_context_set_passwd_cb(cxt, encrypt_pass_get, encrypt_pass_release); + + if (all) { + /* + * A) Mount all + */ + rc = mount_all(cxt); + goto done; + + } else if (argc == 0 && source) { + /* + * B) mount -L|-U + */ + mnt_context_set_source(cxt, source); + + } else if (argc == 1) { + /* + * C) mount [-L|-U] <target> + * mount <source|target> + */ + if (source) { + if (mnt_context_is_restricted(cxt)) + exit_non_root(NULL); + mnt_context_set_source(cxt, source); + } + mnt_context_set_target(cxt, argv[0]); + + } else if (argc == 2 && !source) { + /* + * D) mount <source> <target> + */ + if (mnt_context_is_restricted(cxt)) + exit_non_root(NULL); + mnt_context_set_source(cxt, argv[0]); + mnt_context_set_target(cxt, argv[1]); + } else + usage(stderr); + + if (oper) + mnt_context_set_mflags(cxt, oper); + + rc = mnt_context_mount(cxt); + if (rc) { + /* TODO: call mnt_context_strerror() */ + rc = EX_FAIL; + } else + rc = EX_SUCCESS; +done: + free(srcbuf); + mnt_free_context(cxt); + return rc; +} + |