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Diffstat (limited to 'utils/umount.c')
-rw-r--r--utils/umount.c319
1 files changed, 319 insertions, 0 deletions
diff --git a/utils/umount.c b/utils/umount.c
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--- /dev/null
+++ b/utils/umount.c
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+/* Roughly Unix/Linux-compatible `umount' frontend for Hurd translators.
+
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ Written by Justus Winter <4winter@informatik.uni-hamburg.de>
+
+ This file is part of the GNU Hurd.
+
+ The GNU Hurd 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, or (at
+ your option) any later version.
+
+ The GNU Hurd is distributed in the hope that it will 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "../sutils/fstab.h"
+#include <argp.h>
+#include <argz.h>
+#include <blkid/blkid.h>
+#include <error.h>
+#include <fcntl.h>
+#include <hurd/fshelp.h>
+#include <hurd/fsys.h>
+#include <hurd/paths.h>
+#include <hurd/process.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "match-options.h"
+
+/* XXX fix libc */
+#undef _PATH_MOUNTED
+#define _PATH_MOUNTED "/etc/mtab"
+
+static char *targets;
+static size_t targets_len;
+static int readonly;
+static int verbose;
+static int passive_flags = FS_TRANS_SET;
+static int active_flags = FS_TRANS_SET;
+static int goaway_flags;
+static int fake;
+
+static struct fstab_argp_params fstab_params;
+
+#define FAKE_KEY 0x80 /* !isascii (FAKE_KEY), so no short option. */
+
+static const struct argp_option argp_opts[] =
+{
+ {"fake", FAKE_KEY, 0, 0, "Do not actually umount, just pretend"},
+ {"force", 'f', 0, 0, "Force umount by killing the translator"},
+ {"no-mtab", 'n', 0, 0, "Do not update /etc/mtab"},
+ {"read-only", 'r', 0, 0, "If unmounting fails, try to remount read-only"},
+ {"nosync", 'S', 0, 0, "Don't sync a translator before killing it"},
+ {"test-opts", 'O', "OPTIONS", 0,
+ "Only mount fstab entries matching the given set of options"},
+ {"verbose", 'v', 0, 0, "Give more detailed information"},
+ {},
+};
+
+static error_t
+parse_opt (int key, char *arg, struct argp_state *state)
+{
+ struct fstab_argp_params *params = state->input;
+ error_t err;
+ switch (key)
+ {
+ case ARGP_KEY_INIT:
+ state->child_inputs[0] = params; /* pass down to fstab_argp parser */
+ break;
+
+ case FAKE_KEY:
+ fake = 1;
+ break;
+
+ case 'f':
+ goaway_flags |= FSYS_GOAWAY_FORCE;
+ break;
+
+ case 'n':
+ /* do nothing */
+ break;
+
+ case 'r':
+ readonly = 1;
+ break;
+
+ case 'S':
+ goaway_flags |= FSYS_GOAWAY_NOSYNC;
+ break;
+
+ case 'O':
+ err = argz_create_sep (arg, ',', &test_opts, &test_opts_len);
+ if (err)
+ argp_failure (state, 100, ENOMEM, "%s", arg);
+ break;
+
+ case 'v':
+ verbose += 1;
+ break;
+
+ case ARGP_KEY_ARG:
+ err = argz_add (&targets, &targets_len, arg);
+ if (err)
+ argp_failure (state, 100, ENOMEM, "%s", arg);
+ break;
+
+ case ARGP_KEY_NO_ARGS:
+ if (! params->do_all)
+ {
+ argp_error (state,
+ "filesystem argument required if --all is not given");
+ return EINVAL;
+ }
+ break;
+
+ case ARGP_KEY_END:
+ if (params->do_all && targets)
+ {
+ argp_error (state, "filesystem argument not allowed with --all");
+ return EINVAL;
+ }
+ break;
+
+ default:
+ return ARGP_ERR_UNKNOWN;
+ }
+
+ return 0;
+}
+
+static const char doc[] = "Stop active and remove passive translators";
+static const char args_doc[] = "DEVICE|DIRECTORY [DEVICE|DIRECTORY ...]";
+
+static struct argp fstab_argp_mtab; /* Slightly modified version. */
+
+static const struct argp_child argp_kids[] =
+{
+ {&fstab_argp_mtab, 0,
+ "Filesystem selection (if no explicit filesystem arguments given):", 2},
+ {},
+};
+static struct argp argp =
+{
+ options: argp_opts,
+ parser: parse_opt,
+ args_doc: args_doc,
+ doc: doc,
+ children: argp_kids,
+};
+
+/* This is a trimmed and slightly modified version of
+ fstab_argp.options which uses _PATH_MOUNTED instead of _PATH_MNTTAB
+ in the doc strings. */
+static const struct argp_option fstab_argp_mtab_opts[] =
+{
+ {"all", 'a', 0, 0, "Do all filesystems in " _PATH_MOUNTED},
+ {0, 'A', 0, OPTION_ALIAS },
+ {"fstab", 'F', "FILE", 0, "File to use instead of " _PATH_MOUNTED},
+ {"fstype", 't', "TYPE", 0, "Do only filesystems of given type(s)"},
+ {"exclude-root",'R',0, 0,
+ "Exclude root (/) filesystem from " _PATH_MOUNTED " list"},
+ {"exclude", 'X', "PATTERN", 0, "Exclude directories matching PATTERN"},
+ {}
+};
+
+static error_t
+fstab_argp_mtab_parse_opt (int key, char *arg, struct argp_state *state)
+{
+ return fstab_argp.parser (key, arg, state);
+}
+
+static struct argp fstab_argp_mtab =
+{
+ options: fstab_argp_mtab_opts,
+ parser: fstab_argp_mtab_parse_opt,
+};
+
+/* Unmount one filesystem. */
+static error_t
+do_umount (struct fs *fs)
+{
+ error_t err = 0;
+
+ file_t node = file_name_lookup(fs->mntent.mnt_dir, O_NOTRANS, 0666);
+ if (node == MACH_PORT_NULL)
+ {
+ error(0, errno, "%s", fs->mntent.mnt_dir);
+ return errno;
+ }
+
+ if (verbose)
+ printf ("settrans -pg%s%s %s\n",
+ goaway_flags & FSYS_GOAWAY_NOSYNC? "S": "",
+ goaway_flags & FSYS_GOAWAY_FORCE? "f": "",
+ fs->mntent.mnt_dir);
+
+ if (! fake)
+ {
+ err = file_set_translator (node,
+ passive_flags, active_flags, goaway_flags,
+ NULL, 0,
+ MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND);
+ if (err)
+ {
+ error (0, err, "%s", fs->mntent.mnt_dir);
+
+ /* Try remounting readonly instead if requested. */
+ if (readonly)
+ {
+ if (verbose)
+ printf ("fsysopts %s --readonly\n", fs->mntent.mnt_dir);
+
+ error_t e = fs_set_readonly (fs, TRUE);
+ if (e)
+ error (0, e, "%s", fs->mntent.mnt_dir);
+ }
+ }
+ }
+
+ /* Deallocate the reference so that unmounting nested translators
+ works properly. */
+ mach_port_deallocate (mach_task_self (), node);
+ return err;
+}
+
+int
+main (int argc, char **argv)
+{
+ error_t err;
+
+ err = argp_parse (&argp, argc, argv, 0, 0, &fstab_params);
+ if (err)
+ error (3, err, "parsing arguments");
+
+ /* Read the mtab file by default. */
+ if (! fstab_params.fstab_path)
+ fstab_params.fstab_path = _PATH_MOUNTED;
+
+ struct fstab *fstab = fstab_argp_create (&fstab_params, NULL, 0);
+ if (! fstab)
+ error (3, ENOMEM, "fstab creation");
+
+ if (targets)
+ for (char *t = targets; t; t = argz_next (targets, targets_len, t))
+ {
+ /* Figure out if t is the device or the mountpoint. */
+ struct fs *fs = fstab_find_mount (fstab, t);
+ if (! fs)
+ {
+ fs = fstab_find_device (fstab, t);
+ if (! fs)
+ {
+ error (0, 0, "could not find entry for: %s", t);
+
+ /* As last resort, just assume it is the mountpoint. */
+ struct mntent m =
+ {
+ mnt_fsname: "",
+ mnt_dir: t,
+ mnt_type: "",
+ mnt_opts: 0,
+ mnt_freq: 0,
+ mnt_passno: 0,
+ };
+
+ err = fstab_add_mntent (fstab, &m, &fs);
+ if (err)
+ error (2, err, "%s", t);
+ }
+ }
+
+ if (fs)
+ err |= do_umount (fs);
+ }
+ else
+ {
+ /* Sort entries. */
+ size_t count = 0;
+ for (struct fs *fs = fstab->entries; fs; fs = fs->next)
+ count += 1;
+
+ char **entries = malloc (count * sizeof (char *));
+ if (! entries)
+ error (3, ENOMEM, "allocating entries array");
+
+ char **p = entries;
+ for (struct fs *fs = fstab->entries; fs; fs = fs->next)
+ *p++ = fs->mntent.mnt_dir;
+
+ /* Reverse lexicographical order. */
+ int compare_entries (const void *a, const void *b)
+ {
+ return -strcmp ((char *) a, (char *) b);
+ }
+
+ qsort (entries, count, sizeof (char *), compare_entries);
+
+ for (int i = 0; i < count; i++)
+ {
+ struct fs *fs = fstab_find_mount (fstab, entries[i]);
+ if (! fs)
+ error (4, 0, "could not find entry for: %s", entries[i]);
+
+ if (! match_options (&fs->mntent))
+ continue;
+
+ err |= do_umount (fs);
+ }
+ }
+
+ return err? EXIT_FAILURE: EXIT_SUCCESS;
+}
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