util-lib: move fstab_node_to_udev_node() to fstab-util.[ch]

2 files changed, 63 insertions, 2 deletions

diff --git a/src/shared/fstab-util.c b/src/shared/fstab-util.c
index 20fb0f5a06..77faa7bc35 100644
--- a/src/shared/fstab-util.c
+++ b/src/shared/fstab-util.c
@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include "device-nodes.h"
 #include "fstab-util.h"
 #include "parse-util.h"
 #include "path-util.h"
@@ -196,3 +197,60 @@ int fstab_find_pri(const char *options, int *ret) {
         *ret = (int) pri;
         return 1;
 }
+
+static char *unquote(const char *s, const char* quotes) {
+        size_t l;
+        assert(s);
+
+        /* This is rather stupid, simply removes the heading and
+         * trailing quotes if there is one. Doesn't care about
+         * escaping or anything.
+         *
+         * DON'T USE THIS FOR NEW CODE ANYMORE!*/
+
+        l = strlen(s);
+        if (l < 2)
+                return strdup(s);
+
+        if (strchr(quotes, s[0]) && s[l-1] == s[0])
+                return strndup(s+1, l-2);
+
+        return strdup(s);
+}
+
+static char *tag_to_udev_node(const char *tagvalue, const char *by) {
+        _cleanup_free_ char *t = NULL, *u = NULL;
+        size_t enc_len;
+
+        u = unquote(tagvalue, QUOTES);
+        if (!u)
+                return NULL;
+
+        enc_len = strlen(u) * 4 + 1;
+        t = new(char, enc_len);
+        if (!t)
+                return NULL;
+
+        if (encode_devnode_name(u, t, enc_len) < 0)
+                return NULL;
+
+        return strjoin("/dev/disk/by-", by, "/", t, NULL);
+}
+
+char *fstab_node_to_udev_node(const char *p) {
+        assert(p);
+
+        if (startswith(p, "LABEL="))
+                return tag_to_udev_node(p+6, "label");
+
+        if (startswith(p, "UUID="))
+                return tag_to_udev_node(p+5, "uuid");
+
+        if (startswith(p, "PARTUUID="))
+                return tag_to_udev_node(p+9, "partuuid");
+
+        if (startswith(p, "PARTLABEL="))
+                return tag_to_udev_node(p+10, "partlabel");
+
+        return strdup(p);
+}
diff --git a/src/shared/fstab-util.h b/src/shared/fstab-util.h
index 872b2363cd..5ebea44019 100644
--- a/src/shared/fstab-util.h
+++ b/src/shared/fstab-util.h
@@ -23,11 +23,12 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+
 #include "macro.h"
 
 bool fstab_is_mount_point(const char *mount);
-int fstab_filter_options(const char *opts, const char *names,
-                         const char **namefound, char **value, char **filtered);
+
+int fstab_filter_options(const char *opts, const char *names, const char **namefound, char **value, char **filtered);
 
 int fstab_extract_values(const char *opts, const char *name, char ***values);
 
@@ -49,3 +50,5 @@ static inline bool fstab_test_yes_no_option(const char *opts, const char *yes_no
 
         return opt == yes_no;
 }
+
+char *fstab_node_to_udev_node(const char *p);