298 lines
9.1 KiB
C
298 lines
9.1 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "alloc-util.h"
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#include "device-nodes.h"
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#include "fstab-util.h"
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#include "macro.h"
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#include "mount-util.h"
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#include "nulstr-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "string-util.h"
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#include "strv.h"
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int fstab_has_fstype(const char *fstype) {
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_cleanup_endmntent_ FILE *f = NULL;
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struct mntent *m;
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f = setmntent(fstab_path(), "re");
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if (!f)
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return errno == ENOENT ? false : -errno;
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for (;;) {
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errno = 0;
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m = getmntent(f);
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if (!m)
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return errno != 0 ? -errno : false;
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if (streq(m->mnt_type, fstype))
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return true;
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}
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return false;
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}
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bool fstab_is_extrinsic(const char *mount, const char *opts) {
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/* Don't bother with the OS data itself */
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if (PATH_IN_SET(mount,
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"/",
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"/usr",
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"/etc"))
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return true;
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if (PATH_STARTSWITH_SET(mount,
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"/run/initramfs", /* This should stay around from before we boot until after we shutdown */
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"/proc", /* All of this is API VFS */
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"/sys", /* … dito … */
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"/dev")) /* … dito … */
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return true;
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/* If this is an initrd mount, and we are not in the initrd, then leave
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* this around forever, too. */
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if (opts && fstab_test_option(opts, "x-initrd.mount\0") && !in_initrd())
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return true;
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return false;
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}
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int fstab_is_mount_point(const char *mount) {
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_cleanup_endmntent_ FILE *f = NULL;
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struct mntent *m;
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f = setmntent(fstab_path(), "re");
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if (!f)
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return errno == ENOENT ? false : -errno;
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for (;;) {
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errno = 0;
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m = getmntent(f);
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if (!m)
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return errno != 0 ? -errno : false;
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if (path_equal(m->mnt_dir, mount))
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return true;
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}
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return false;
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}
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int fstab_filter_options(const char *opts, const char *names,
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const char **ret_namefound, char **ret_value, char **ret_filtered) {
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const char *name, *namefound = NULL, *x;
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_cleanup_strv_free_ char **stor = NULL;
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_cleanup_free_ char *v = NULL, **strv = NULL;
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int r;
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assert(names && *names);
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if (!opts)
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goto answer;
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/* If !ret_value and !ret_filtered, this function is not allowed to fail. */
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if (!ret_filtered) {
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for (const char *word = opts;;) {
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const char *end = word;
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/* Look for an *non-escaped* comma separator. Only commas can be escaped, so "\," is
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* the only valid escape sequence, so we can do a very simple test here. */
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for (;;) {
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size_t n = strcspn(end, ",");
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end += n;
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if (n > 0 && end[-1] == '\\')
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end++;
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else
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break;
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}
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NULSTR_FOREACH(name, names) {
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if (end < word + strlen(name))
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continue;
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if (!strneq(word, name, strlen(name)))
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continue;
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/* We know that the string is NUL terminated, so *x is valid */
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x = word + strlen(name);
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if (IN_SET(*x, '\0', '=', ',')) {
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namefound = name;
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if (ret_value) {
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bool eq = *x == '=';
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assert(eq || IN_SET(*x, ',', '\0'));
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r = free_and_strndup(&v,
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eq ? x + 1 : NULL,
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eq ? end - x - 1 : 0);
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if (r < 0)
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return r;
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}
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break;
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}
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}
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if (*end)
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word = end + 1;
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else
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break;
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}
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} else {
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r = strv_split_full(&stor, opts, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
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if (r < 0)
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return r;
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strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1));
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if (!strv)
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return -ENOMEM;
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char **t = strv;
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for (char **s = strv; *s; s++) {
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NULSTR_FOREACH(name, names) {
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x = startswith(*s, name);
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if (x && IN_SET(*x, '\0', '='))
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goto found;
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}
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*t = *s;
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t++;
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continue;
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found:
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/* Keep the last occurrence found */
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namefound = name;
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if (ret_value) {
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assert(IN_SET(*x, '=', '\0'));
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r = free_and_strdup(&v, *x == '=' ? x + 1 : NULL);
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if (r < 0)
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return r;
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}
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}
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*t = NULL;
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}
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answer:
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if (ret_namefound)
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*ret_namefound = namefound;
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if (ret_filtered) {
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char *f;
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f = strv_join_full(strv, ",", NULL, true);
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if (!f)
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return -ENOMEM;
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*ret_filtered = f;
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}
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if (ret_value)
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*ret_value = TAKE_PTR(v);
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return !!namefound;
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}
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int fstab_extract_values(const char *opts, const char *name, char ***values) {
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_cleanup_strv_free_ char **optsv = NULL, **res = NULL;
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char **s;
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assert(opts);
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assert(name);
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assert(values);
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optsv = strv_split(opts, ",");
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if (!optsv)
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return -ENOMEM;
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STRV_FOREACH(s, optsv) {
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char *arg;
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int r;
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arg = startswith(*s, name);
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if (!arg || *arg != '=')
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continue;
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r = strv_extend(&res, arg + 1);
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if (r < 0)
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return r;
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}
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*values = TAKE_PTR(res);
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return !!*values;
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}
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int fstab_find_pri(const char *options, int *ret) {
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_cleanup_free_ char *opt = NULL;
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int r, pri;
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assert(ret);
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r = fstab_filter_options(options, "pri\0", NULL, &opt, NULL);
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if (r < 0)
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return r;
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if (r == 0 || !opt)
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return 0;
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r = safe_atoi(opt, &pri);
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if (r < 0)
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return r;
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*ret = pri;
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return 1;
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}
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static char *unquote(const char *s, const char* quotes) {
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size_t l;
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assert(s);
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/* This is rather stupid, simply removes the heading and
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* trailing quotes if there is one. Doesn't care about
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* escaping or anything.
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*
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* DON'T USE THIS FOR NEW CODE ANYMORE! */
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l = strlen(s);
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if (l < 2)
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return strdup(s);
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if (strchr(quotes, s[0]) && s[l-1] == s[0])
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return strndup(s+1, l-2);
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return strdup(s);
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}
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static char *tag_to_udev_node(const char *tagvalue, const char *by) {
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_cleanup_free_ char *t = NULL, *u = NULL;
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size_t enc_len;
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u = unquote(tagvalue, QUOTES);
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if (!u)
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return NULL;
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enc_len = strlen(u) * 4 + 1;
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t = new(char, enc_len);
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if (!t)
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return NULL;
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if (encode_devnode_name(u, t, enc_len) < 0)
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return NULL;
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return strjoin("/dev/disk/by-", by, "/", t);
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}
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char *fstab_node_to_udev_node(const char *p) {
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assert(p);
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if (startswith(p, "LABEL="))
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return tag_to_udev_node(p+6, "label");
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if (startswith(p, "UUID="))
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return tag_to_udev_node(p+5, "uuid");
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if (startswith(p, "PARTUUID="))
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return tag_to_udev_node(p+9, "partuuid");
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if (startswith(p, "PARTLABEL="))
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return tag_to_udev_node(p+10, "partlabel");
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return strdup(p);
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}
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