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-rw-r--r--src/shared/fstab-util.c268
1 files changed, 268 insertions, 0 deletions
diff --git a/src/shared/fstab-util.c b/src/shared/fstab-util.c
new file mode 100644
index 0000000..6fd9866
--- /dev/null
+++ b/src/shared/fstab-util.c
@@ -0,0 +1,268 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <errno.h>
+#include <mntent.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "alloc-util.h"
+#include "device-nodes.h"
+#include "fstab-util.h"
+#include "macro.h"
+#include "mount-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "util.h"
+
+int fstab_has_fstype(const char *fstype) {
+ _cleanup_endmntent_ FILE *f = NULL;
+ struct mntent *m;
+
+ f = setmntent("/etc/fstab", "re");
+ if (!f)
+ return errno == ENOENT ? false : -errno;
+
+ for (;;) {
+ errno = 0;
+ m = getmntent(f);
+ if (!m)
+ return errno != 0 ? -errno : false;
+
+ if (streq(m->mnt_type, fstype))
+ return true;
+ }
+ return false;
+}
+
+int fstab_is_mount_point(const char *mount) {
+ _cleanup_endmntent_ FILE *f = NULL;
+ struct mntent *m;
+
+ f = setmntent("/etc/fstab", "re");
+ if (!f)
+ return errno == ENOENT ? false : -errno;
+
+ for (;;) {
+ errno = 0;
+ m = getmntent(f);
+ if (!m)
+ return errno != 0 ? -errno : false;
+
+ if (path_equal(m->mnt_dir, mount))
+ return true;
+ }
+ return false;
+}
+
+int fstab_filter_options(const char *opts, const char *names,
+ const char **namefound, char **value, char **filtered) {
+ const char *name, *n = NULL, *x;
+ _cleanup_strv_free_ char **stor = NULL;
+ _cleanup_free_ char *v = NULL, **strv = NULL;
+
+ assert(names && *names);
+
+ if (!opts)
+ goto answer;
+
+ /* If !value and !filtered, this function is not allowed to fail. */
+
+ if (!filtered) {
+ const char *word, *state;
+ size_t l;
+
+ FOREACH_WORD_SEPARATOR(word, l, opts, ",", state)
+ NULSTR_FOREACH(name, names) {
+ if (l < strlen(name))
+ continue;
+ if (!strneq(word, name, strlen(name)))
+ continue;
+
+ /* we know that the string is NUL
+ * terminated, so *x is valid */
+ x = word + strlen(name);
+ if (IN_SET(*x, '\0', '=', ',')) {
+ n = name;
+ if (value) {
+ free(v);
+ if (IN_SET(*x, '\0', ','))
+ v = NULL;
+ else {
+ assert(*x == '=');
+ x++;
+ v = strndup(x, l - strlen(name) - 1);
+ if (!v)
+ return -ENOMEM;
+ }
+ }
+ }
+ }
+ } else {
+ char **t, **s;
+
+ stor = strv_split(opts, ",");
+ if (!stor)
+ return -ENOMEM;
+ strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1));
+ if (!strv)
+ return -ENOMEM;
+
+ for (s = t = strv; *s; s++) {
+ NULSTR_FOREACH(name, names) {
+ x = startswith(*s, name);
+ if (x && IN_SET(*x, '\0', '='))
+ goto found;
+ }
+
+ *t = *s;
+ t++;
+ continue;
+ found:
+ /* Keep the last occurence found */
+ n = name;
+ if (value) {
+ free(v);
+ if (*x == '\0')
+ v = NULL;
+ else {
+ assert(*x == '=');
+ x++;
+ v = strdup(x);
+ if (!v)
+ return -ENOMEM;
+ }
+ }
+ }
+ *t = NULL;
+ }
+
+answer:
+ if (namefound)
+ *namefound = n;
+ if (filtered) {
+ char *f;
+
+ f = strv_join(strv, ",");
+ if (!f)
+ return -ENOMEM;
+
+ *filtered = f;
+ }
+ if (value)
+ *value = TAKE_PTR(v);
+
+ return !!n;
+}
+
+int fstab_extract_values(const char *opts, const char *name, char ***values) {
+ _cleanup_strv_free_ char **optsv = NULL, **res = NULL;
+ char **s;
+
+ assert(opts);
+ assert(name);
+ assert(values);
+
+ optsv = strv_split(opts, ",");
+ if (!optsv)
+ return -ENOMEM;
+
+ STRV_FOREACH(s, optsv) {
+ char *arg;
+ int r;
+
+ arg = startswith(*s, name);
+ if (!arg || *arg != '=')
+ continue;
+ r = strv_extend(&res, arg + 1);
+ if (r < 0)
+ return r;
+ }
+
+ *values = TAKE_PTR(res);
+
+ return !!*values;
+}
+
+int fstab_find_pri(const char *options, int *ret) {
+ _cleanup_free_ char *opt = NULL;
+ int r;
+ unsigned pri;
+
+ assert(ret);
+
+ r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0 || !opt)
+ return 0;
+
+ r = safe_atou(opt, &pri);
+ if (r < 0)
+ return r;
+
+ if ((int) pri < 0)
+ return -ERANGE;
+
+ *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);
+}
+
+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);
+}