libmount: add support for mount -a

Signed-off-by: Karel Zak <kzak@redhat.com>

5 files changed, 221 insertions, 20 deletions

diff --git a/libmount/src/context.c b/libmount/src/context.c
index 681b0575b..ff199ea2e 100644
--- a/libmount/src/context.c
+++ b/libmount/src/context.c
@@ -66,7 +66,7 @@ struct libmnt_context *mnt_new_context(void)
 	/* if we're really root and aren't running setuid */
 	cxt->restricted = (uid_t) 0 == ruid && ruid == euid ? 0 : 1;
 
-	DBG(CXT, mnt_debug_h(cxt, "allocate %s",
+	DBG(CXT, mnt_debug_h(cxt, "----> allocate %s",
 				cxt->restricted ? "[RESTRICTED]" : ""));
 
 	mnt_has_regular_mtab(&cxt->mtab_path, &cxt->mtab_writable);
@@ -103,7 +103,7 @@ void mnt_free_context(struct libmnt_context *cxt)
 	mnt_free_lock(cxt->lock);
 	mnt_free_update(cxt->update);
 
-	DBG(CXT, mnt_debug_h(cxt, "free"));
+	DBG(CXT, mnt_debug_h(cxt, "<---- free"));
 	free(cxt);
 }
 
@@ -134,10 +134,8 @@ int mnt_reset_context(struct libmnt_context *cxt)
 	if (!cxt)
 		return -EINVAL;
 
-	DBG(CXT, mnt_debug_h(cxt,
-		"reset [status=%d %s]",
-		mnt_context_get_status(cxt),
-		mnt_context_get_status(cxt) == 0 ? "FAILED" : "SUCCESS"));
+	DBG(CXT, mnt_debug_h(cxt, "<---- reset [status=%d] ---->",
+				mnt_context_get_status(cxt)));
 
 	fl = cxt->flags;
 
@@ -165,7 +163,16 @@ int mnt_reset_context(struct libmnt_context *cxt)
 	/* restore non-resetable flags */
 	cxt->flags |= (fl & MNT_FL_EXTERN_FSTAB);
 	cxt->flags |= (fl & MNT_FL_EXTERN_CACHE);
-
+	cxt->flags |= (fl & MNT_FL_NOMTAB);
+	cxt->flags |= (fl & MNT_FL_FAKE);
+	cxt->flags |= (fl & MNT_FL_SLOPPY);
+	cxt->flags |= (fl & MNT_FL_VERBOSE);
+	cxt->flags |= (fl & MNT_FL_NOHELPERS);
+	cxt->flags |= (fl & MNT_FL_LOOPDEL);
+	cxt->flags |= (fl & MNT_FL_LAZY);
+	cxt->flags |= (fl & MNT_FL_FORCE);
+	cxt->flags |= (fl & MNT_FL_NOCANONICALIZE);
+	cxt->flags |= (fl & MNT_FL_RDONLY_UMOUNT);
 	return 0;
 }
 
@@ -1556,7 +1563,7 @@ int mnt_context_get_status(struct libmnt_context *cxt)
 /**
  * mnt_context_set_syscall_status:
  * @cxt: mount context
- * @status: mount(2) return code
+ * @status: mount(2) status
  *
  * The @status should be 0 on succcess, or negative number on error (-1 or
  * -errno).
@@ -1645,6 +1652,30 @@ int mnt_context_helper_setopt(struct libmnt_context *cxt, int c, char *arg)
 	return -EINVAL;
 }
 
+/**
+ * @cxt: context
+ * @fs; filesystem
+ * @mounted: returns 1 for mounted and 0 for non-mounted filesystems
+ *
+ * Returns: 0 on success and negative number in case of error.
+ */
+int mnt_context_is_fs_mounted(struct libmnt_context *cxt,
+			      struct libmnt_fs *fs, int *mounted)
+{
+	struct libmnt_table *mtab;
+	int rc;
+
+	if (!cxt || !fs || !mounted)
+		return -EINVAL;
+
+	rc = mnt_context_get_mtab(cxt, &mtab);
+	if (rc)
+		return rc;
+
+	*mounted = mnt_table_is_fs_mounted(mtab, fs);
+	return 0;
+}
+
 #ifdef TEST_PROGRAM
 
 struct libmnt_lock *lock;
@@ -1796,15 +1827,62 @@ int test_flags(struct libmnt_test *ts, int argc, char *argv[])
 	return rc;
 }
 
+int test_mountall(struct libmnt_test *ts, int argc, char *argv[])
+{
+	struct libmnt_context *cxt;
+	struct libmnt_iter *itr;
+	struct libmnt_fs *fs;
+	int mntrc, ignored, idx = 1;
+
+	cxt = mnt_new_context();
+	itr = mnt_new_iter(MNT_ITER_FORWARD);
+
+	if (!cxt || !itr)
+		return -ENOMEM;
+
+	if (argc > 2) {
+		if (!strcmp(argv[idx], "-O")) {
+			mnt_context_set_options_pattern(cxt, argv[idx + 1]);
+			idx += 2;
+		}
+		if (!strcmp(argv[idx], "-t")) {
+			mnt_context_set_fstype_pattern(cxt, argv[idx + 1]);
+			idx += 2;
+		}
+	}
+
+	while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) {
+
+		const char *tgt = mnt_fs_get_target(fs);
+
+		if (ignored == 1)
+			printf("%s: ignored: not match\n", tgt);
+		else if (ignored == 2)
+			printf("%s: ignored: already mounted\n", tgt);
+
+		else if (!mnt_context_get_status(cxt)) {
+			if (mntrc > 0) {
+				errno = mntrc;
+				warn("%s: mount failed", tgt);
+			} else
+				warnx("%s: mount failed", tgt);
+		} else
+			printf("%s: successfully mounted\n", tgt);
+	}
+
+	mnt_free_context(cxt);
+	return 0;
+}
+
 int main(int argc, char *argv[])
 {
 	struct libmnt_test tss[] = {
 	{ "--mount",  test_mount,  "[-o <opts>] [-t <type>] <spec>|<src> <target>" },
 	{ "--umount", test_umount, "[-t <type>] [-f][-l][-r] <src>|<target>" },
+	{ "--mount-all", test_mountall,  "[-O <pattern>] [-t <pattern] mount all filesystems from fstab" },
 	{ "--flags", test_flags,   "[-o <opts>] <spec>" },
 	{ NULL }};
 
-
 	umask(S_IWGRP|S_IWOTH);	/* to be compatible with mount(8) */
 
 	return mnt_run_test(tss, argc, argv);
diff --git a/libmount/src/context_mount.c b/libmount/src/context_mount.c
index 58c3ec10e..53bb3a735 100644
--- a/libmount/src/context_mount.c
+++ b/libmount/src/context_mount.c
@@ -359,6 +359,10 @@ static int exec_helper(struct libmnt_context *cxt)
 /*
  * The default is to use fstype from cxt->fs, this could be overwritten by
  * @try_type argument.
+ *
+ * Returns: 0 on success,
+ *         >0 in case of mount(2) error (returns syscall errno),
+ *         <0 in case of other errors.
  */
 static int do_mount(struct libmnt_context *cxt, const char *try_type)
 {
@@ -608,7 +612,7 @@ int mnt_context_finalize_mount(struct libmnt_context *cxt)
  *          mount.type helper wasn't sucessfully called.
  *
  *          Check mnt_context_get_status() after error!
-*
+ *
  * Returns: 0 on success;
  *         >0 in case of mount(2) error (returns syscall errno),
  *         <0 in case of other errors.
@@ -637,3 +641,114 @@ int mnt_context_mount(struct libmnt_context *cxt)
 	return rc;
 }
 
+/**
+ * mnt_context_next_mount:
+ * @cxt: context
+ * @itr: iterator
+ * @fs: returns the current filesystem
+ * @mntrc: returns the return code from mnt_mount_context()
+ * @ignored: returns 1 for not matching and 2 for already mounted filesystems
+ *
+ * This function tries to mount the next filesystem from fstab (as returned by
+ * mnt_context_get_fstab()). See also mnt_context_set_fstab().
+ *
+ * You can filter out filesystems by:
+ *	mnt_context_set_options_pattern() to simulate mount -a -O <pattern>
+ *	mnt_context_set_fstype_pattern()  to simulate mount -a -t <pattern>
+ *
+ * If the filesystem is already mounted or does not match defined criteria,
+ * then the mnt_context_next_mount() function returns zero, but the @ignored is
+ * non-zero. Note that the root filesystem and filesystems with "noauto" option
+ * are always ignored.
+ *
+ * If mount(2) syscall or mount.<type> helper failed, then the
+ * mnt_context_next_mount() function returns zero, but the @mntrc is non-zero.
+ * Use also mnt_context_get_status() to check if the filesystem was
+ * successfully mounted.
+ *
+ * Returns: 0 on success,
+ *         <0 in case of error (!= mount(2) errors)
+ *          1 at the end of the list.
+ */
+int mnt_context_next_mount(struct libmnt_context *cxt,
+			   struct libmnt_iter *itr,
+			   struct libmnt_fs **fs,
+			   int *mntrc,
+			   int *ignored)
+{
+	struct libmnt_table *fstab, *mtab;
+	const char *o, *tgt;
+	int rc, mounted = 0;
+
+	if (ignored)
+		*ignored = 0;
+	if (mntrc)
+		*mntrc = 0;
+
+	if (!cxt || !fs || !itr)
+		return -EINVAL;
+
+	mtab = cxt->mtab;
+	cxt->mtab = NULL;		/* do not reset mtab */
+	mnt_reset_context(cxt);
+	cxt->mtab = mtab;
+
+	rc = mnt_context_get_fstab(cxt, &fstab);
+	if (rc)
+		return rc;
+
+	rc = mnt_table_next_fs(fstab, itr, fs);
+	if (rc != 0)
+		return rc;	/* more filesystems (or error) */
+
+	o = mnt_fs_get_user_options(*fs);
+	tgt = mnt_fs_get_target(*fs);
+
+	DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt));
+
+	/*  ignore swap */
+	if (((*fs)->flags & MNT_FS_SWAP) ||
+
+	/* ignore root filesystem */
+	  (tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||
+
+	/* ignore noauto filesystems */
+	   (o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) ||
+
+	/* ignore filesystems not match with options patterns */
+	   (cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
+					cxt->fstype_pattern)) ||
+
+	/* ignore filesystems not match with type patterns */
+	   (cxt->optstr_pattern && !mnt_fs_match_options(*fs,
+					cxt->optstr_pattern))) {
+		if (ignored)
+			*ignored = 1;
+		DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match "
+				"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
+				mnt_fs_get_fstype(*fs),
+				cxt->fstype_pattern,
+				mnt_fs_get_options(*fs),
+				cxt->optstr_pattern));
+		return 0;
+	}
+
+	/* ignore already mounted filesystems */
+	rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted);
+	if (rc)
+		return rc;
+	if (mounted) {
+		if (ignored)
+			*ignored = 2;
+		return 0;
+	}
+
+	rc = mnt_context_set_fs(cxt, *fs);
+	if (rc)
+		return rc;
+	rc = mnt_context_mount(cxt);
+	if (mntrc)
+		*mntrc = rc;
+	return 0;
+}
+
diff --git a/libmount/src/libmount.h.in b/libmount/src/libmount.h.in
index a224fb0f8..111b3a683 100644
--- a/libmount/src/libmount.h.in
+++ b/libmount/src/libmount.h.in
@@ -155,7 +155,7 @@ extern int mnt_optstr_append_option(char **optstr, const char *name,
 				const char *value);
 extern int mnt_optstr_prepend_option(char **optstr, const char *name,
 				const char *value);
-extern int mnt_optstr_get_option(char *optstr, const char *name,
+extern int mnt_optstr_get_option(const char *optstr, const char *name,
 				char **value, size_t *valsz);
 extern int mnt_optstr_set_option(char **optstr, const char *name,
 				const char *value);
@@ -395,6 +395,9 @@ extern int mnt_context_is_nomtab(struct libmnt_context *cxt);
 extern int mnt_context_is_force(struct libmnt_context *cxt);
 extern int mnt_context_is_verbose(struct libmnt_context *cxt);
 
+extern int mnt_context_is_fs_mounted(struct libmnt_context *cxt,
+                              struct libmnt_fs *fs, int *mounted);
+
 extern int mnt_context_set_fs(struct libmnt_context *cxt, struct libmnt_fs *fs);
 extern struct libmnt_fs *mnt_context_get_fs(struct libmnt_context *cxt);
 extern int mnt_context_set_source(struct libmnt_context *cxt, const char *source);
@@ -445,6 +448,9 @@ extern int mnt_context_strerror(struct libmnt_context *cxt, char *buf,
 
 extern int mnt_context_mount(struct libmnt_context *cxt);
 extern int mnt_context_umount(struct libmnt_context *cxt);
+extern int mnt_context_next_mount(struct libmnt_context *cxt,
+			   struct libmnt_iter *itr, struct libmnt_fs **fs,
+			   int *mntrc, int *ignored);
 
 extern int mnt_context_prepare_mount(struct libmnt_context *cxt);
 extern int mnt_context_do_mount(struct libmnt_context *cxt);
diff --git a/libmount/src/libmount.sym b/libmount/src/libmount.sym
index d8c01c018..34727a668 100644
--- a/libmount/src/libmount.sym
+++ b/libmount/src/libmount.sym
@@ -34,12 +34,14 @@ global:
 	mnt_context_get_optsmode;
 	mnt_context_get_source;
 	mnt_context_get_status;
+	mnt_context_get_table;
 	mnt_context_get_target;
 	mnt_context_get_user_mflags;
 	mnt_context_helper_setopt;
 	mnt_context_init_helper;
 	mnt_context_is_fake;
 	mnt_context_is_force;
+	mnt_context_is_fs_mounted;
 	mnt_context_is_lazy;
 	mnt_context_is_nomtab;
 	mnt_context_is_rdonly_umount;
@@ -47,6 +49,7 @@ global:
 	mnt_context_is_sloppy;
 	mnt_context_is_verbose;
 	mnt_context_mount;
+	mnt_context_next_mount;
 	mnt_context_prepare_mount;
 	mnt_context_prepare_umount;
 	mnt_context_set_cache;
@@ -61,19 +64,20 @@ global:
 	mnt_context_set_optsmode;
 	mnt_context_set_source;
 	mnt_context_set_syscall_status;
-	mnt_context_get_table;
 	mnt_context_set_tables_errcb;
 	mnt_context_set_target;
 	mnt_context_set_user_mflags;
 	mnt_context_strerror;
 	mnt_context_umount;
 	mnt_copy_fs;
+	mnt_diff_tables;
 	mnt_free_cache;
 	mnt_free_context;
 	mnt_free_fs;
 	mnt_free_iter;
 	mnt_free_lock;
 	mnt_free_mntent;
+	mnt_free_tabdiff;
 	mnt_free_table;
 	mnt_free_update;
 	mnt_fs_append_attributes;
@@ -138,6 +142,7 @@ global:
 	mnt_new_fs;
 	mnt_new_iter;
 	mnt_new_lock;
+	mnt_new_tabdiff;
 	mnt_new_table;
 	mnt_new_table_from_dir;
 	mnt_new_table_from_file;
@@ -160,6 +165,7 @@ global:
 	mnt_resolve_spec;
 	mnt_resolve_tag;
 	mnt_split_optstr;
+	mnt_tabdiff_next_change;
 	mnt_table_add_fs;
 	mnt_table_find_next_fs;
 	mnt_table_find_pair;
@@ -171,6 +177,7 @@ global:
 	mnt_table_get_name;
 	mnt_table_get_nents;
 	mnt_table_get_root_fs;
+	mnt_table_is_fs_mounted;
 	mnt_table_next_child_fs;
 	mnt_table_next_fs;
 	mnt_table_parse_file;
@@ -190,11 +197,6 @@ global:
 	mnt_update_is_ready;
 	mnt_update_set_fs;
 	mnt_update_table;
-	mnt_new_tabdiff;
-	mnt_free_tabdiff;
-	mnt_diff_tables;
-	mnt_tabdiff_next_change;
-	mnt_table_is_fs_mounted;
 local:
 	*;
 };
diff --git a/libmount/src/optstr.c b/libmount/src/optstr.c
index 406afc4b7..78b7571d2 100644
--- a/libmount/src/optstr.c
+++ b/libmount/src/optstr.c
@@ -273,15 +273,15 @@ int mnt_optstr_prepend_option(char **optstr, const char *name, const char *value
  * Returns: 0 on success, 1 when not found the @name or negative number in case
  * of error.
  */
-int mnt_optstr_get_option(char *optstr, const char *name,
-				char **value, size_t *valsz)
+int mnt_optstr_get_option(const char *optstr, const char *name,
+			  char **value, size_t *valsz)
 {
 	struct libmnt_optloc ol;
 	int rc;
 
 	mnt_init_optloc(&ol);
 
-	rc = mnt_optstr_locate_option(optstr, name, &ol);
+	rc = mnt_optstr_locate_option((char *) optstr, name, &ol);
 	if (!rc) {
 		if (value)
 			*value = ol.value;