Adding upstream version 247.3.upstream/247.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 297 insertions, 0 deletions

diff --git a/src/shared/fstab-util.c b/src/shared/fstab-util.c
new file mode 100644
index 0000000..292b97c
--- /dev/null
+++ b/src/shared/fstab-util.c
@@ -0,0 +1,297 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "alloc-util.h"
+#include "device-nodes.h"
+#include "fstab-util.h"
+#include "macro.h"
+#include "mount-util.h"
+#include "nulstr-util.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "string-util.h"
+#include "strv.h"
+
+int fstab_has_fstype(const char *fstype) {
+        _cleanup_endmntent_ FILE *f = NULL;
+        struct mntent *m;
+
+        f = setmntent(fstab_path(), "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;
+}
+
+bool fstab_is_extrinsic(const char *mount, const char *opts) {
+
+        /* Don't bother with the OS data itself */
+        if (PATH_IN_SET(mount,
+                        "/",
+                        "/usr",
+                        "/etc"))
+                return true;
+
+        if (PATH_STARTSWITH_SET(mount,
+                                "/run/initramfs",    /* This should stay around from before we boot until after we shutdown */
+                                "/proc",             /* All of this is API VFS */
+                                "/sys",              /* … dito … */
+                                "/dev"))             /* … dito … */
+                return true;
+
+        /* If this is an initrd mount, and we are not in the initrd, then leave
+         * this around forever, too. */
+        if (opts && fstab_test_option(opts, "x-initrd.mount\0") && !in_initrd())
+                return true;
+
+        return false;
+}
+
+int fstab_is_mount_point(const char *mount) {
+        _cleanup_endmntent_ FILE *f = NULL;
+        struct mntent *m;
+
+        f = setmntent(fstab_path(), "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 **ret_namefound, char **ret_value, char **ret_filtered) {
+        const char *name, *namefound = NULL, *x;
+        _cleanup_strv_free_ char **stor = NULL;
+        _cleanup_free_ char *v = NULL, **strv = NULL;
+        int r;
+
+        assert(names && *names);
+
+        if (!opts)
+                goto answer;
+
+        /* If !ret_value and !ret_filtered, this function is not allowed to fail. */
+
+        if (!ret_filtered) {
+                for (const char *word = opts;;) {
+                        const char *end = word;
+
+                        /* Look for an *non-escaped* comma separator. Only commas can be escaped, so "\," is
+                         * the only valid escape sequence, so we can do a very simple test here. */
+                        for (;;) {
+                                size_t n = strcspn(end, ",");
+
+                                end += n;
+                                if (n > 0 && end[-1] == '\\')
+                                        end++;
+                                else
+                                        break;
+                        }
+
+                        NULSTR_FOREACH(name, names) {
+                                if (end < word + 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', '=', ',')) {
+                                        namefound = name;
+                                        if (ret_value) {
+                                                bool eq = *x == '=';
+                                                assert(eq || IN_SET(*x, ',', '\0'));
+
+                                                r = free_and_strndup(&v,
+                                                                     eq ? x + 1 : NULL,
+                                                                     eq ? end - x - 1 : 0);
+                                                if (r < 0)
+                                                        return r;
+                                        }
+
+                                        break;
+                                }
+                        }
+
+                        if (*end)
+                                word = end + 1;
+                        else
+                                break;
+                }
+        } else {
+                r = strv_split_full(&stor, opts, ",", EXTRACT_DONT_COALESCE_SEPARATORS | EXTRACT_UNESCAPE_SEPARATORS);
+                if (r < 0)
+                        return r;
+
+                strv = memdup(stor, sizeof(char*) * (strv_length(stor) + 1));
+                if (!strv)
+                        return -ENOMEM;
+
+                char **t = strv;
+                for (char **s = 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 occurrence found */
+                        namefound = name;
+                        if (ret_value) {
+                                assert(IN_SET(*x, '=', '\0'));
+                                r = free_and_strdup(&v, *x == '=' ? x + 1 : NULL);
+                                if (r < 0)
+                                        return r;
+                        }
+                }
+                *t = NULL;
+        }
+
+answer:
+        if (ret_namefound)
+                *ret_namefound = namefound;
+        if (ret_filtered) {
+                char *f;
+
+                f = strv_join_full(strv, ",", NULL, true);
+                if (!f)
+                        return -ENOMEM;
+
+                *ret_filtered = f;
+        }
+        if (ret_value)
+                *ret_value = TAKE_PTR(v);
+
+        return !!namefound;
+}
+
+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, 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_atoi(opt, &pri);
+        if (r < 0)
+                return r;
+
+        *ret = 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);
+}