blob: b685535151abd6e996e37d28b5a434161f04829f [file] [log] [blame]
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* This file is part of libmount from util-linux project.
*
* Copyright (C) 2011-2018 Karel Zak <kzak@redhat.com>
*
* libmount is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*/
/**
* SECTION: update
* @title: Tables update
* @short_description: userspace mount information management
*
* The struct libmnt_update provides an abstraction to manage mount options in
* userspace independently of system configuration. This low-level API works on
* systems both with and without /etc/mtab. On systems without the regular /etc/mtab
* file, the userspace mount options (e.g. user=) are stored in the /run/mount/utab
* file.
*
* It's recommended to use high-level struct libmnt_context API.
*/
#include <sys/file.h>
#include <fcntl.h>
#include <signal.h>
#include "mountP.h"
#include "mangle.h"
#include "pathnames.h"
struct libmnt_update {
char *target;
struct libmnt_fs *fs;
char *filename;
unsigned long mountflags;
int userspace_only;
int ready;
struct libmnt_table *mountinfo;
};
static int set_fs_root(struct libmnt_update *upd, struct libmnt_fs *fs, unsigned long mountflags);
static int utab_new_entry(struct libmnt_update *upd, struct libmnt_fs *fs, unsigned long mountflags);
/**
* mnt_new_update:
*
* Returns: newly allocated update handler
*/
struct libmnt_update *mnt_new_update(void)
{
struct libmnt_update *upd;
upd = calloc(1, sizeof(*upd));
if (!upd)
return NULL;
DBG(UPDATE, ul_debugobj(upd, "allocate"));
return upd;
}
/**
* mnt_free_update:
* @upd: update
*
* Deallocates struct libmnt_update handler.
*/
void mnt_free_update(struct libmnt_update *upd)
{
if (!upd)
return;
DBG(UPDATE, ul_debugobj(upd, "free"));
mnt_unref_fs(upd->fs);
mnt_unref_table(upd->mountinfo);
free(upd->target);
free(upd->filename);
free(upd);
}
/*
* Returns 0 on success, <0 in case of error.
*/
int mnt_update_set_filename(struct libmnt_update *upd, const char *filename,
int userspace_only)
{
const char *path = NULL;
int rw = 0;
if (!upd)
return -EINVAL;
/* filename explicitly defined */
if (filename) {
char *p = strdup(filename);
if (!p)
return -ENOMEM;
upd->userspace_only = userspace_only;
free(upd->filename);
upd->filename = p;
}
if (upd->filename)
return 0;
/* detect tab filename -- /etc/mtab or /run/mount/utab
*/
#ifdef USE_LIBMOUNT_SUPPORT_MTAB
mnt_has_regular_mtab(&path, &rw);
#endif
if (!rw) {
path = NULL;
mnt_has_regular_utab(&path, &rw);
if (!rw)
return -EACCES;
upd->userspace_only = TRUE;
}
upd->filename = strdup(path);
if (!upd->filename)
return -ENOMEM;
return 0;
}
/**
* mnt_update_get_filename:
* @upd: update
*
* This function returns the file name (e.g. /etc/mtab) of the up-dated file.
*
* Returns: pointer to filename that will be updated or NULL in case of error.
*/
const char *mnt_update_get_filename(struct libmnt_update *upd)
{
return upd ? upd->filename : NULL;
}
/**
* mnt_update_is_ready:
* @upd: update handler
*
* Returns: 1 if entry described by @upd is successfully prepared and will be
* written to the mtab/utab file.
*/
int mnt_update_is_ready(struct libmnt_update *upd)
{
return upd ? upd->ready : FALSE;
}
/**
* mnt_update_set_fs:
* @upd: update handler
* @mountflags: MS_* flags
* @target: umount target, must be NULL for mount
* @fs: mount filesystem description, must be NULL for umount
*
* Returns: <0 in case on error, 0 on success, 1 if update is unnecessary.
*/
int mnt_update_set_fs(struct libmnt_update *upd, unsigned long mountflags,
const char *target, struct libmnt_fs *fs)
{
int rc;
if (!upd)
return -EINVAL;
if ((mountflags & MS_MOVE) && (!fs || !mnt_fs_get_srcpath(fs)))
return -EINVAL;
if (target && fs)
return -EINVAL;
DBG(UPDATE, ul_debugobj(upd,
"resetting FS [target=%s, flags=0x%08lx]",
target, mountflags));
if (fs) {
DBG(UPDATE, ul_debugobj(upd, "FS template:"));
DBG(UPDATE, mnt_fs_print_debug(fs, stderr));
}
mnt_unref_fs(upd->fs);
free(upd->target);
upd->ready = FALSE;
upd->fs = NULL;
upd->target = NULL;
upd->mountflags = 0;
if (mountflags & MS_PROPAGATION)
return 1;
upd->mountflags = mountflags;
rc = mnt_update_set_filename(upd, NULL, 0);
if (rc) {
DBG(UPDATE, ul_debugobj(upd, "no writable file available [rc=%d]", rc));
return rc; /* error or no file available (rc = 1) */
}
if (target) {
upd->target = strdup(target);
if (!upd->target)
return -ENOMEM;
} else if (fs) {
if (upd->userspace_only && !(mountflags & MS_MOVE)) {
rc = utab_new_entry(upd, fs, mountflags);
if (rc)
return rc;
} else {
upd->fs = mnt_copy_mtab_fs(fs);
if (!upd->fs)
return -ENOMEM;
}
}
DBG(UPDATE, ul_debugobj(upd, "ready"));
upd->ready = TRUE;
return 0;
}
/**
* mnt_update_get_fs:
* @upd: update
*
* Returns: update filesystem entry or NULL
*/
struct libmnt_fs *mnt_update_get_fs(struct libmnt_update *upd)
{
return upd ? upd->fs : NULL;
}
/**
* mnt_update_get_mflags:
* @upd: update
*
* Returns: mount flags as was set by mnt_update_set_fs()
*/
unsigned long mnt_update_get_mflags(struct libmnt_update *upd)
{
return upd ? upd->mountflags : 0;
}
/**
* mnt_update_force_rdonly:
* @upd: update
* @rdonly: is read-only?
*
* Returns: 0 on success and negative number in case of error.
*/
int mnt_update_force_rdonly(struct libmnt_update *upd, int rdonly)
{
int rc = 0;
if (!upd || !upd->fs)
return -EINVAL;
if (rdonly && (upd->mountflags & MS_RDONLY))
return 0;
if (!rdonly && !(upd->mountflags & MS_RDONLY))
return 0;
if (!upd->userspace_only) {
/* /etc/mtab -- we care about VFS options there */
const char *o = mnt_fs_get_options(upd->fs);
char *n = o ? strdup(o) : NULL;
if (n)
mnt_optstr_remove_option(&n, rdonly ? "rw" : "ro");
if (!mnt_optstr_prepend_option(&n, rdonly ? "ro" : "rw", NULL))
rc = mnt_fs_set_options(upd->fs, n);
free(n);
}
if (rdonly)
upd->mountflags &= ~MS_RDONLY;
else
upd->mountflags |= MS_RDONLY;
return rc;
}
/*
* Allocates an utab entry (upd->fs) for mount/remount. This function should be
* called *before* mount(2) syscall. The @fs is used as a read-only template.
*
* Returns: 0 on success, negative number on error, 1 if utab's update is
* unnecessary.
*/
static int utab_new_entry(struct libmnt_update *upd, struct libmnt_fs *fs,
unsigned long mountflags)
{
int rc = 0;
const char *o, *a;
char *u = NULL;
assert(fs);
assert(upd);
assert(upd->fs == NULL);
assert(!(mountflags & MS_MOVE));
DBG(UPDATE, ul_debug("prepare utab entry"));
o = mnt_fs_get_user_options(fs);
a = mnt_fs_get_attributes(fs);
upd->fs = NULL;
if (o) {
/* remove non-mtab options */
rc = mnt_optstr_get_options(o, &u,
mnt_get_builtin_optmap(MNT_USERSPACE_MAP),
MNT_NOMTAB);
if (rc)
goto err;
}
if (!u && !a) {
DBG(UPDATE, ul_debug("utab entry unnecessary (no options)"));
return 1;
}
/* allocate the entry */
upd->fs = mnt_copy_fs(NULL, fs);
if (!upd->fs) {
rc = -ENOMEM;
goto err;
}
rc = mnt_fs_set_options(upd->fs, u);
if (rc)
goto err;
rc = mnt_fs_set_attributes(upd->fs, a);
if (rc)
goto err;
if (!(mountflags & MS_REMOUNT)) {
rc = set_fs_root(upd, fs, mountflags);
if (rc)
goto err;
}
free(u);
DBG(UPDATE, ul_debug("utab entry OK"));
return 0;
err:
free(u);
mnt_unref_fs(upd->fs);
upd->fs = NULL;
return rc;
}
/*
* Sets fs-root and fs-type to @upd->fs according to the @fs template and
* @mountfalgs. For MS_BIND mountflag it reads information about the source
* filesystem from /proc/self/mountinfo.
*/
static int set_fs_root(struct libmnt_update *upd, struct libmnt_fs *fs,
unsigned long mountflags)
{
struct libmnt_fs *src_fs;
char *fsroot = NULL;
const char *src, *fstype;
int rc = 0;
DBG(UPDATE, ul_debug("setting FS root"));
assert(upd);
assert(upd->fs);
assert(fs);
fstype = mnt_fs_get_fstype(fs);
if (mountflags & MS_BIND) {
if (!upd->mountinfo)
upd->mountinfo = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
src = mnt_fs_get_srcpath(fs);
if (src) {
rc = mnt_fs_set_bindsrc(upd->fs, src);
if (rc)
goto err;
}
} else if (fstype && (strcmp(fstype, "btrfs") == 0 || strcmp(fstype, "auto") == 0)) {
if (!upd->mountinfo)
upd->mountinfo = mnt_new_table_from_file(_PATH_PROC_MOUNTINFO);
}
src_fs = mnt_table_get_fs_root(upd->mountinfo, fs,
mountflags, &fsroot);
if (src_fs) {
src = mnt_fs_get_srcpath(src_fs);
rc = mnt_fs_set_source(upd->fs, src);
if (rc)
goto err;
mnt_fs_set_fstype(upd->fs, mnt_fs_get_fstype(src_fs));
}
upd->fs->root = fsroot;
return 0;
err:
free(fsroot);
return rc;
}
/* mtab and fstab update -- returns zero on success
*/
static int fprintf_mtab_fs(FILE *f, struct libmnt_fs *fs)
{
const char *o, *src, *fstype, *comm;
char *m1, *m2, *m3, *m4;
int rc;
assert(fs);
assert(f);
comm = mnt_fs_get_comment(fs);
src = mnt_fs_get_source(fs);
fstype = mnt_fs_get_fstype(fs);
o = mnt_fs_get_options(fs);
m1 = src ? mangle(src) : "none";
m2 = mangle(mnt_fs_get_target(fs));
m3 = fstype ? mangle(fstype) : "none";
m4 = o ? mangle(o) : "rw";
if (m1 && m2 && m3 && m4) {
if (comm)
fputs(comm, f);
rc = fprintf(f, "%s %s %s %s %d %d\n",
m1, m2, m3, m4,
mnt_fs_get_freq(fs),
mnt_fs_get_passno(fs));
if (rc > 0)
rc = 0;
} else
rc = -ENOMEM;
if (src)
free(m1);
free(m2);
if (fstype)
free(m3);
if (o)
free(m4);
return rc;
}
static int fprintf_utab_fs(FILE *f, struct libmnt_fs *fs)
{
char *p;
int rc = 0;
if (!fs || !f)
return -EINVAL;
p = mangle(mnt_fs_get_source(fs));
if (p) {
rc = fprintf(f, "SRC=%s ", p);
free(p);
}
if (rc >= 0) {
p = mangle(mnt_fs_get_target(fs));
if (p) {
rc = fprintf(f, "TARGET=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_root(fs));
if (p) {
rc = fprintf(f, "ROOT=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_bindsrc(fs));
if (p) {
rc = fprintf(f, "BINDSRC=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_attributes(fs));
if (p) {
rc = fprintf(f, "ATTRS=%s ", p);
free(p);
}
}
if (rc >= 0) {
p = mangle(mnt_fs_get_user_options(fs));
if (p) {
rc = fprintf(f, "OPTS=%s", p);
free(p);
}
}
if (rc >= 0)
rc = fprintf(f, "\n");
if (rc > 0)
rc = 0; /* success */
return rc;
}
static int update_table(struct libmnt_update *upd, struct libmnt_table *tb)
{
FILE *f;
int rc, fd;
char *uq = NULL;
if (!tb || !upd->filename)
return -EINVAL;
DBG(UPDATE, ul_debugobj(upd, "%s: updating", upd->filename));
fd = mnt_open_uniq_filename(upd->filename, &uq);
if (fd < 0)
return fd; /* error */
f = fdopen(fd, "w" UL_CLOEXECSTR);
if (f) {
struct stat st;
struct libmnt_iter itr;
struct libmnt_fs *fs;
mnt_reset_iter(&itr, MNT_ITER_FORWARD);
if (tb->comms && mnt_table_get_intro_comment(tb))
fputs(mnt_table_get_intro_comment(tb), f);
while(mnt_table_next_fs(tb, &itr, &fs) == 0) {
if (upd->userspace_only)
rc = fprintf_utab_fs(f, fs);
else
rc = fprintf_mtab_fs(f, fs);
if (rc) {
DBG(UPDATE, ul_debugobj(upd,
"%s: write entry failed: %m", uq));
goto leave;
}
}
if (tb->comms && mnt_table_get_trailing_comment(tb))
fputs(mnt_table_get_trailing_comment(tb), f);
if (fflush(f) != 0) {
rc = -errno;
DBG(UPDATE, ul_debugobj(upd, "%s: fflush failed: %m", uq));
goto leave;
}
rc = fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) ? -errno : 0;
if (!rc && stat(upd->filename, &st) == 0)
/* Copy uid/gid from the present file before renaming. */
rc = fchown(fd, st.st_uid, st.st_gid) ? -errno : 0;
fclose(f);
f = NULL;
if (!rc)
rc = rename(uq, upd->filename) ? -errno : 0;
} else {
rc = -errno;
close(fd);
}
leave:
if (f)
fclose(f);
unlink(uq); /* be paranoid */
free(uq);
DBG(UPDATE, ul_debugobj(upd, "%s: done [rc=%d]", upd->filename, rc));
return rc;
}
/**
* mnt_table_write_file
* @tb: parsed file (e.g. fstab)
* @file: target
*
* This function writes @tb to @file.
*
* Returns: 0 on success, negative number on error.
*/
int mnt_table_write_file(struct libmnt_table *tb, FILE *file)
{
int rc = 0;
struct libmnt_iter itr;
struct libmnt_fs *fs;
if (tb->comms && mnt_table_get_intro_comment(tb))
fputs(mnt_table_get_intro_comment(tb), file);
mnt_reset_iter(&itr, MNT_ITER_FORWARD);
while(mnt_table_next_fs(tb, &itr, &fs) == 0) {
rc = fprintf_mtab_fs(file, fs);
if (rc)
return rc;
}
if (tb->comms && mnt_table_get_trailing_comment(tb))
fputs(mnt_table_get_trailing_comment(tb), file);
if (fflush(file) != 0)
rc = -errno;
DBG(TAB, ul_debugobj(tb, "write file done [rc=%d]", rc));
return rc;
}
/**
* mnt_table_replace_file
* @tb: parsed file (e.g. fstab)
* @filename: target
*
* This function replaces @file by the new content from @tb.
*
* Returns: 0 on success, negative number on error.
*/
int mnt_table_replace_file(struct libmnt_table *tb, const char *filename)
{
int fd, rc = 0;
FILE *f;
char *uq = NULL;
DBG(TAB, ul_debugobj(tb, "%s: replacing", filename));
fd = mnt_open_uniq_filename(filename, &uq);
if (fd < 0)
return fd; /* error */
f = fdopen(fd, "w" UL_CLOEXECSTR);
if (f) {
struct stat st;
mnt_table_write_file(tb, f);
if (fflush(f) != 0) {
rc = -errno;
DBG(UPDATE, ul_debug("%s: fflush failed: %m", uq));
goto leave;
}
rc = fchmod(fd, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) ? -errno : 0;
if (!rc && stat(filename, &st) == 0)
/* Copy uid/gid from the present file before renaming. */
rc = fchown(fd, st.st_uid, st.st_gid) ? -errno : 0;
fclose(f);
f = NULL;
if (!rc)
rc = rename(uq, filename) ? -errno : 0;
} else {
rc = -errno;
close(fd);
}
leave:
if (f)
fclose(f);
unlink(uq);
free(uq);
DBG(TAB, ul_debugobj(tb, "replace done [rc=%d]", rc));
return rc;
}
static int add_file_entry(struct libmnt_table *tb, struct libmnt_update *upd)
{
struct libmnt_fs *fs;
assert(upd);
fs = mnt_copy_fs(NULL, upd->fs);
if (!fs)
return -ENOMEM;
mnt_table_add_fs(tb, fs);
mnt_unref_fs(fs);
return update_table(upd, tb);
}
static int update_add_entry(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb;
int rc = 0;
assert(upd);
assert(upd->fs);
DBG(UPDATE, ul_debugobj(upd, "%s: add entry", upd->filename));
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return -MNT_ERR_LOCK;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB, 1);
if (tb)
rc = add_file_entry(tb, upd);
if (lc)
mnt_unlock_file(lc);
mnt_unref_table(tb);
return rc;
}
static int update_remove_entry(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb;
int rc = 0;
assert(upd);
assert(upd->target);
DBG(UPDATE, ul_debugobj(upd, "%s: remove entry", upd->filename));
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return -MNT_ERR_LOCK;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB, 1);
if (tb) {
struct libmnt_fs *rem = mnt_table_find_target(tb, upd->target, MNT_ITER_BACKWARD);
if (rem) {
mnt_table_remove_fs(tb, rem);
rc = update_table(upd, tb);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_unref_table(tb);
return rc;
}
static int update_modify_target(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
int rc = 0;
assert(upd);
DBG(UPDATE, ul_debugobj(upd, "%s: modify target", upd->filename));
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return -MNT_ERR_LOCK;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB, 1);
if (tb) {
struct libmnt_fs *cur = mnt_table_find_target(tb,
mnt_fs_get_srcpath(upd->fs), MNT_ITER_BACKWARD);
if (cur) {
rc = mnt_fs_set_target(cur, mnt_fs_get_target(upd->fs));
if (!rc)
rc = update_table(upd, tb);
}
}
if (lc)
mnt_unlock_file(lc);
mnt_unref_table(tb);
return rc;
}
static int update_modify_options(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
int rc = 0;
struct libmnt_fs *fs;
assert(upd);
assert(upd->fs);
DBG(UPDATE, ul_debugobj(upd, "%s: modify options", upd->filename));
fs = upd->fs;
if (lc)
rc = mnt_lock_file(lc);
if (rc)
return -MNT_ERR_LOCK;
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB, 1);
if (tb) {
struct libmnt_fs *cur = mnt_table_find_target(tb,
mnt_fs_get_target(fs),
MNT_ITER_BACKWARD);
if (cur) {
if (upd->userspace_only)
rc = mnt_fs_set_attributes(cur, mnt_fs_get_attributes(fs));
if (!rc)
rc = mnt_fs_set_options(cur, mnt_fs_get_options(fs));
if (!rc)
rc = update_table(upd, tb);
} else
rc = add_file_entry(tb, upd); /* not found, add new */
}
if (lc)
mnt_unlock_file(lc);
mnt_unref_table(tb);
return rc;
}
/**
* mnt_update_table:
* @upd: update
* @lc: lock or NULL
*
* High-level API to update /etc/mtab (or private /run/mount/utab file).
*
* The @lc lock is optional and will be created if necessary. Note that
* an automatically created lock blocks all signals.
*
* See also mnt_lock_block_signals() and mnt_context_get_lock().
*
* Returns: 0 on success, negative number on error.
*/
int mnt_update_table(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_lock *lc0 = lc;
int rc = -EINVAL;
if (!upd || !upd->filename)
return -EINVAL;
if (!upd->ready)
return 0;
DBG(UPDATE, ul_debugobj(upd, "%s: update tab", upd->filename));
if (upd->fs) {
DBG(UPDATE, mnt_fs_print_debug(upd->fs, stderr));
}
if (!lc) {
lc = mnt_new_lock(upd->filename, 0);
if (lc)
mnt_lock_block_signals(lc, TRUE);
}
if (lc && upd->userspace_only)
mnt_lock_use_simplelock(lc, TRUE); /* use flock */
if (!upd->fs && upd->target)
rc = update_remove_entry(upd, lc); /* umount */
else if (upd->mountflags & MS_MOVE)
rc = update_modify_target(upd, lc); /* move */
else if (upd->mountflags & MS_REMOUNT)
rc = update_modify_options(upd, lc); /* remount */
else if (upd->fs)
rc = update_add_entry(upd, lc); /* mount */
upd->ready = FALSE;
DBG(UPDATE, ul_debugobj(upd, "%s: update tab: done [rc=%d]",
upd->filename, rc));
if (lc != lc0)
mnt_free_lock(lc);
return rc;
}
int mnt_update_already_done(struct libmnt_update *upd, struct libmnt_lock *lc)
{
struct libmnt_table *tb = NULL;
struct libmnt_lock *lc0 = lc;
int rc = 0;
if (!upd || !upd->filename || (!upd->fs && !upd->target))
return -EINVAL;
DBG(UPDATE, ul_debugobj(upd, "%s: checking for previous update", upd->filename));
if (!lc) {
lc = mnt_new_lock(upd->filename, 0);
if (lc)
mnt_lock_block_signals(lc, TRUE);
}
if (lc && upd->userspace_only)
mnt_lock_use_simplelock(lc, TRUE); /* use flock */
if (lc) {
rc = mnt_lock_file(lc);
if (rc) {
rc = -MNT_ERR_LOCK;
goto done;
}
}
tb = __mnt_new_table_from_file(upd->filename,
upd->userspace_only ? MNT_FMT_UTAB : MNT_FMT_MTAB, 1);
if (lc)
mnt_unlock_file(lc);
if (!tb)
goto done;
if (upd->fs) {
/* mount */
const char *tgt = mnt_fs_get_target(upd->fs);
const char *src = mnt_fs_get_bindsrc(upd->fs) ?
mnt_fs_get_bindsrc(upd->fs) :
mnt_fs_get_source(upd->fs);
if (mnt_table_find_pair(tb, src, tgt, MNT_ITER_BACKWARD)) {
DBG(UPDATE, ul_debugobj(upd, "%s: found %s %s",
upd->filename, src, tgt));
rc = 1;
}
} else if (upd->target) {
/* umount */
if (!mnt_table_find_target(tb, upd->target, MNT_ITER_BACKWARD)) {
DBG(UPDATE, ul_debugobj(upd, "%s: not-found (umounted) %s",
upd->filename, upd->target));
rc = 1;
}
}
mnt_unref_table(tb);
done:
if (lc && lc != lc0)
mnt_free_lock(lc);
DBG(UPDATE, ul_debugobj(upd, "%s: previous update check done [rc=%d]",
upd->filename, rc));
return rc;
}
#ifdef TEST_PROGRAM
static int update(const char *target, struct libmnt_fs *fs, unsigned long mountflags)
{
int rc;
struct libmnt_update *upd;
DBG(UPDATE, ul_debug("update test"));
upd = mnt_new_update();
if (!upd)
return -ENOMEM;
rc = mnt_update_set_fs(upd, mountflags, target, fs);
if (rc == 1) {
/* update is unnecessary */
rc = 0;
goto done;
}
if (rc) {
fprintf(stderr, "failed to set FS\n");
goto done;
}
/* [... mount(2) call should be here...] */
rc = mnt_update_table(upd, NULL);
done:
mnt_free_update(upd);
return rc;
}
static int test_add(struct libmnt_test *ts, int argc, char *argv[])
{
struct libmnt_fs *fs = mnt_new_fs();
int rc;
if (argc < 5 || !fs)
return -1;
mnt_fs_set_source(fs, argv[1]);
mnt_fs_set_target(fs, argv[2]);
mnt_fs_set_fstype(fs, argv[3]);
mnt_fs_set_options(fs, argv[4]);
rc = update(NULL, fs, 0);
mnt_unref_fs(fs);
return rc;
}
static int test_remove(struct libmnt_test *ts, int argc, char *argv[])
{
if (argc < 2)
return -1;
return update(argv[1], NULL, 0);
}
static int test_move(struct libmnt_test *ts, int argc, char *argv[])
{
struct libmnt_fs *fs = mnt_new_fs();
int rc;
if (argc < 3)
return -1;
mnt_fs_set_source(fs, argv[1]);
mnt_fs_set_target(fs, argv[2]);
rc = update(NULL, fs, MS_MOVE);
mnt_unref_fs(fs);
return rc;
}
static int test_remount(struct libmnt_test *ts, int argc, char *argv[])
{
struct libmnt_fs *fs = mnt_new_fs();
int rc;
if (argc < 3)
return -1;
mnt_fs_set_target(fs, argv[1]);
mnt_fs_set_options(fs, argv[2]);
rc = update(NULL, fs, MS_REMOUNT);
mnt_unref_fs(fs);
return rc;
}
static int test_replace(struct libmnt_test *ts, int argc, char *argv[])
{
struct libmnt_fs *fs = mnt_new_fs();
struct libmnt_table *tb = mnt_new_table();
int rc;
if (argc < 3)
return -1;
mnt_table_enable_comments(tb, TRUE);
mnt_table_parse_fstab(tb, NULL);
mnt_fs_set_source(fs, argv[1]);
mnt_fs_set_target(fs, argv[2]);
mnt_fs_append_comment(fs, "# this is new filesystem\n");
mnt_table_add_fs(tb, fs);
mnt_unref_fs(fs);
rc = mnt_table_replace_file(tb, mnt_get_fstab_path());
mnt_unref_table(tb);
return rc;
}
int main(int argc, char *argv[])
{
struct libmnt_test tss[] = {
{ "--add", test_add, "<src> <target> <type> <options> add a line to mtab" },
{ "--remove", test_remove, "<target> MS_REMOUNT mtab change" },
{ "--move", test_move, "<old_target> <target> MS_MOVE mtab change" },
{ "--remount",test_remount, "<target> <options> MS_REMOUNT mtab change" },
{ "--replace",test_replace, "<src> <target> Add a line to LIBMOUNT_FSTAB and replace the original file" },
{ NULL }
};
return mnt_run_test(tss, argc, argv);
}
#endif /* TEST_PROGRAM */