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-rw-r--r--sys-utils/umount.c399
1 files changed, 399 insertions, 0 deletions
diff --git a/sys-utils/umount.c b/sys-utils/umount.c
new file mode 100644
index 0000000..97b2f44
--- /dev/null
+++ b/sys-utils/umount.c
@@ -0,0 +1,399 @@
+/*
+ * umount(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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include <libmount.h>
+
+#include "nls.h"
+#include "c.h"
+#include "env.h"
+#include "optutils.h"
+#include "exitcodes.h"
+#include "closestream.h"
+
+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 void __attribute__((__noreturn__)) print_version(void)
+{
+ const char *ver = NULL;
+ const char **features = NULL, **p;
+
+ mnt_get_library_version(&ver);
+ mnt_get_library_features(&features);
+
+ printf(_("%s from %s (libmount %s"),
+ program_invocation_short_name,
+ PACKAGE_STRING,
+ ver);
+ p = features;
+ while (p && *p) {
+ fputs(p == features ? ": " : ", ", stdout);
+ fputs(*p++, stdout);
+ }
+ fputs(")\n", stdout);
+ exit(MOUNT_EX_SUCCESS);
+}
+static void __attribute__((__noreturn__)) usage(FILE *out)
+{
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(
+ " %1$s [-hV]\n"
+ " %1$s -a [options]\n"
+ " %1$s [options] <source> | <directory>\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_OPTIONS, out);
+ fprintf(out, _(
+ " -a, --all umount all filesystems\n"
+ " -c, --no-canonicalize don't canonicalize paths\n"
+ " -d, --detach-loop if mounted loop device, also free this loop device\n"
+ " --fake dry run; skip the umount(2) syscall\n"
+ " -f, --force force unmount (in case of an unreachable NFS system)\n"));
+ fprintf(out, _(
+ " -i, --internal-only don't call the umount.<type> helpers\n"
+ " -n, --no-mtab don't write to /etc/mtab\n"
+ " -l, --lazy detach the filesystem now, and cleanup all later\n"));
+ fprintf(out, _(
+ " -O, --test-opts <list> limit the set of filesystems (use with -a)\n"
+ " -r, --read-only In case unmounting fails, try to remount read-only\n"
+ " -t, --types <list> limit the set of filesystem types\n"
+ " -v, --verbose say what is being done\n"));
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(USAGE_HELP, out);
+ fputs(USAGE_VERSION, out);
+ fprintf(out, USAGE_MAN_TAIL("umount(8)"));
+
+ exit(out == stderr ? MOUNT_EX_USAGE : MOUNT_EX_SUCCESS);
+}
+
+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(MOUNT_EX_USAGE,
+ _("only root can use \"--%s\" option "
+ "(effective UID is %u)"),
+ option, euid);
+ errx(MOUNT_EX_USAGE, _("only root can do that "
+ "(effective UID is %u)"), euid);
+ }
+ if (option)
+ errx(MOUNT_EX_USAGE, _("only root can use \"--%s\" option"), option);
+ errx(MOUNT_EX_USAGE, _("only root can do that"));
+}
+
+/*
+ * Handles generic errors like ENOMEM, ...
+ *
+ * rc = 0 success
+ * <0 error (usually -errno)
+ *
+ * Returns exit status (MOUNT_EX_*) and prints error message.
+ */
+static int handle_generic_errors(int rc, const char *msg, ...)
+{
+ va_list va;
+
+ va_start(va, msg);
+ errno = -rc;
+
+ switch(errno) {
+ case EINVAL:
+ case EPERM:
+ vwarn(msg, va);
+ rc = MOUNT_EX_USAGE;
+ break;
+ case ENOMEM:
+ vwarn(msg, va);
+ rc = MOUNT_EX_SYSERR;
+ break;
+ default:
+ vwarn(msg, va);
+ rc = MOUNT_EX_FAIL;
+ break;
+ }
+ va_end(va);
+ return rc;
+}
+
+static int mk_exit_code(struct libmnt_context *cxt, int rc)
+{
+ int syserr;
+ const char *tgt = mnt_context_get_target(cxt);
+
+ if (mnt_context_helper_executed(cxt))
+ /*
+ * /sbin/umount.<type> called, return status
+ */
+ return mnt_context_get_helper_status(cxt);
+
+ if (rc == 0 && mnt_context_get_status(cxt) == 1)
+ /*
+ * Libmount success && syscall success.
+ */
+ return MOUNT_EX_SUCCESS;
+
+
+ if (!mnt_context_syscall_called(cxt)) {
+ /*
+ * libmount errors (extra library checks)
+ */
+ return handle_generic_errors(rc, _("%s: umount failed"), tgt);
+
+ } else if (mnt_context_get_syscall_errno(cxt) == 0) {
+ /*
+ * umount(2) syscall success, but something else failed
+ * (probably error in mtab processing).
+ */
+ if (rc < 0)
+ return handle_generic_errors(rc,
+ _("%s: filesystem umounted, but mount(8) failed"),
+ tgt);
+
+ return MOUNT_EX_SOFTWARE; /* internal error */
+
+ }
+
+ /*
+ * umount(2) errors
+ */
+ syserr = mnt_context_get_syscall_errno(cxt);
+
+ switch(syserr) {
+ case ENXIO:
+ warnx(_("%s: invalid block device"), tgt); /* ??? */
+ break;
+ case EINVAL:
+ warnx(_("%s: not mounted"), tgt);
+ break;
+ case EIO:
+ warnx(_("%s: can't write superblock"), tgt);
+ break;
+ case EBUSY:
+ warnx(_("%s: target is busy.\n"
+ " (In some cases useful info about processes that use\n"
+ " the device is found by lsof(8) or fuser(1))"),
+ tgt);
+ break;
+ case ENOENT:
+ warnx(_("%s: not found"), tgt);
+ break;
+ case EPERM:
+ warnx(_("%s: must be superuser to umount"), tgt);
+ break;
+ case EACCES:
+ warnx(_("%s: block devices not permitted on fs"), tgt);
+ break;
+ default:
+ errno = syserr;
+ warn(_("%s"), tgt);
+ break;
+ }
+ return MOUNT_EX_FAIL;
+}
+
+static int umount_all(struct libmnt_context *cxt)
+{
+ struct libmnt_iter *itr;
+ struct libmnt_fs *fs;
+ int mntrc, ignored, rc = 0;
+
+ itr = mnt_new_iter(MNT_ITER_BACKWARD);
+ if (!itr) {
+ warn(_("failed to initialize libmount iterator"));
+ return -ENOMEM;
+ }
+
+ while (mnt_context_next_umount(cxt, itr, &fs, &mntrc, &ignored) == 0) {
+
+ const char *tgt = mnt_fs_get_target(fs);
+
+ if (ignored) {
+ if (mnt_context_is_verbose(cxt))
+ printf(_("%-25s: ignored\n"), tgt);
+ } else {
+ rc |= mk_exit_code(cxt, mntrc);
+
+ if (mnt_context_is_verbose(cxt))
+ printf("%-25s: successfully umounted\n", tgt);
+ }
+ }
+
+ mnt_free_iter(itr);
+ return rc;
+}
+
+static int umount_one(struct libmnt_context *cxt, const char *spec)
+{
+ int rc;
+
+ if (!spec)
+ return -EINVAL;
+
+ if (mnt_context_set_target(cxt, spec))
+ err(MOUNT_EX_SYSERR, _("failed to set umount target"));
+
+ rc = mnt_context_umount(cxt);
+ rc = mk_exit_code(cxt, rc);
+
+ mnt_reset_context(cxt);
+ return rc;
+}
+
+int main(int argc, char **argv)
+{
+ int c, rc = 0, all = 0;
+ struct libmnt_context *cxt;
+ char *types = NULL;
+
+ enum {
+ UMOUNT_OPT_FAKE = CHAR_MAX + 1,
+ };
+
+ static const struct option longopts[] = {
+ { "all", 0, 0, 'a' },
+ { "detach-loop", 0, 0, 'd' },
+ { "fake", 0, 0, UMOUNT_OPT_FAKE },
+ { "force", 0, 0, 'f' },
+ { "help", 0, 0, 'h' },
+ { "internal-only", 0, 0, 'i' },
+ { "lazy", 0, 0, 'l' },
+ { "no-canonicalize", 0, 0, 'c' },
+ { "no-mtab", 0, 0, 'n' },
+ { "read-only", 0, 0, 'r' },
+ { "test-opts", 1, 0, 'O' },
+ { "types", 1, 0, 't' },
+ { "verbose", 0, 0, 'v' },
+ { "version", 0, 0, 'V' },
+ { NULL, 0, 0, 0 }
+ };
+
+ sanitize_env();
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ mnt_init_debug(0);
+ cxt = mnt_new_context();
+ if (!cxt)
+ err(MOUNT_EX_SYSERR, _("libmount context allocation failed"));
+
+ mnt_context_set_tables_errcb(cxt, table_parser_errcb);
+
+ while ((c = getopt_long(argc, argv, "acdfhilnrO:t:vV",
+ longopts, NULL)) != -1) {
+
+
+ /* only few options are allowed for non-root users */
+ if (mnt_context_is_restricted(cxt) && !strchr("hdilVv", 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 'd':
+ mnt_context_enable_loopdel(cxt, TRUE);
+ break;
+ case UMOUNT_OPT_FAKE:
+ mnt_context_enable_fake(cxt, TRUE);
+ break;
+ case 'f':
+ mnt_context_enable_force(cxt, TRUE);
+ break;
+ case 'h':
+ usage(stdout);
+ break;
+ case 'i':
+ mnt_context_disable_helpers(cxt, TRUE);
+ break;
+ case 'l':
+ mnt_context_enable_lazy(cxt, TRUE);
+ break;
+ case 'n':
+ mnt_context_disable_mtab(cxt, TRUE);
+ break;
+ case 'r':
+ mnt_context_enable_rdonly_umount(cxt, TRUE);
+ break;
+ case 'O':
+ if (mnt_context_set_options_pattern(cxt, optarg))
+ err(MOUNT_EX_SYSERR, _("failed to set options pattern"));
+ break;
+ case 't':
+ types = optarg;
+ break;
+ case 'v':
+ mnt_context_enable_verbose(cxt, TRUE);
+ break;
+ case 'V':
+ print_version();
+ break;
+ default:
+ usage(stderr);
+ break;
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (all) {
+ if (!types)
+ types = "noproc,nodevfs,nodevpts,nosysfs,norpc_pipefs,nonfsd";
+
+ mnt_context_set_fstype_pattern(cxt, types);
+ rc = umount_all(cxt);
+
+ } else if (argc < 1) {
+ usage(stderr);
+
+ } else while (argc--)
+ rc += umount_one(cxt, *argv++);
+
+ mnt_free_context(cxt);
+ return rc;
+}
+
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