Adding upstream version 255.4.upstream/255.4

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

1 files changed, 233 insertions, 0 deletions

diff --git a/src/shared/import-util.c b/src/shared/import-util.c
new file mode 100644
index 0000000..9057b78
--- /dev/null
+++ b/src/shared/import-util.c
@@ -0,0 +1,233 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+
+#include "alloc-util.h"
+#include "btrfs-util.h"
+#include "chattr-util.h"
+#include "errno-util.h"
+#include "import-util.h"
+#include "log.h"
+#include "macro.h"
+#include "nulstr-util.h"
+#include "path-util.h"
+#include "string-table.h"
+#include "string-util.h"
+
+static const char *skip_protocol_and_hostname(const char *url) {
+        const char *d;
+        size_t n;
+
+        /* A very very lenient implementation of RFC3986 Section 3.2 */
+
+        /* Find colon separating protocol and hostname */
+        d = strchr(url, ':');
+        if (!d || url == d)
+                return NULL;
+        d++;
+
+        /* Skip slashes after colon */
+        d += strspn(d, "/");
+
+        /* Skip everything till next slash or end */
+        n = strcspn(d, "/?#");
+        if (n == 0)
+                return NULL;
+
+        return d + n;
+}
+
+int import_url_last_component(
+                const char *url,
+                char **ret) {
+
+        const char *e, *p, *h;
+
+        /* This extracts the last path component of the specified URI, i.e. the last non-empty substrings
+         * between two "/" characters. This ignores "Query" and "Fragment" suffixes (as per RFC3986). */
+
+        h = skip_protocol_and_hostname(url);
+        if (!h)
+                return -EINVAL;
+
+        e = h + strcspn(h, "?#"); /* Cut off "Query" and "Fragment" */
+
+        while (e > h && e[-1] == '/') /* Eat trailing slashes */
+                e--;
+
+        p = e;
+        while (p > h && p[-1] != '/') /* Find component before that */
+                p--;
+
+        if (e <= p) /* Empty component? */
+                return -EADDRNOTAVAIL;
+
+        if (ret) {
+                char *s;
+
+                s = strndup(p, e - p);
+                if (!s)
+                        return -ENOMEM;
+
+                *ret = s;
+        }
+
+        return 0;
+}
+
+int import_url_change_suffix(
+                const char *url,
+                size_t n_drop_components,
+                const char *suffix,
+                char **ret) {
+
+        const char *e, *h;
+        char *s;
+
+        assert(url);
+        assert(ret);
+
+        /* This drops the specified number of path components of the specified URI, i.e. the specified number
+         * of non-empty substring between two "/" characters from the end of the string, and then append the
+         * specified suffix instead. Before doing all this it chops off the "Query" and "Fragment" suffixes
+         * (they are *not* re-added to the final URL). Note that n_drop_components may be 0 (in which case the
+         * component are simply added to the end). The suffix may be specified as NULL or empty string in
+         * which case nothing is appended, only the specified number of components chopped off. Note that the
+         * function may be called with n_drop_components == 0 and suffix == NULL, in which case the "Query"
+         * and "Fragment" is chopped off, and ensured the URL ends in a single "/", and that's it. */
+
+        h = skip_protocol_and_hostname(url);
+        if (!h)
+                return -EINVAL;
+
+        e = h + strcspn(h, "?#"); /* Cut off "Query" and "Fragment" */
+
+        while (e > h && e[-1] == '/') /* Eat trailing slashes */
+                e--;
+
+        /* Drop the specified number of components from the end. Note that this is pretty lenient: if there
+         * are less component we silently drop those and then append the suffix to the top. */
+        while (n_drop_components > 0) {
+                while (e > h && e[-1] != '/') /* Eat last word (we don't mind if empty) */
+                        e--;
+
+                while (e > h && e[-1] == '/') /* Eat slashes before the last word */
+                        e--;
+
+                n_drop_components--;
+        }
+
+        s = new(char, (e - url) + 1 + strlen_ptr(suffix) + 1);
+        if (!s)
+                return -ENOMEM;
+
+        strcpy(stpcpy(mempcpy(s, url, e - url), "/"), strempty(suffix));
+        *ret = s;
+        return 0;
+}
+
+static const char* const import_verify_table[_IMPORT_VERIFY_MAX] = {
+        [IMPORT_VERIFY_NO] = "no",
+        [IMPORT_VERIFY_CHECKSUM] = "checksum",
+        [IMPORT_VERIFY_SIGNATURE] = "signature",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(import_verify, ImportVerify);
+
+int tar_strip_suffixes(const char *name, char **ret) {
+        const char *e;
+        char *s;
+
+        e = endswith(name, ".tar");
+        if (!e)
+                e = endswith(name, ".tar.xz");
+        if (!e)
+                e = endswith(name, ".tar.gz");
+        if (!e)
+                e = endswith(name, ".tar.bz2");
+        if (!e)
+                e = endswith(name, ".tgz");
+        if (!e)
+                e = strchr(name, 0);
+
+        if (e <= name)
+                return -EINVAL;
+
+        s = strndup(name, e - name);
+        if (!s)
+                return -ENOMEM;
+
+        *ret = s;
+        return 0;
+}
+
+int raw_strip_suffixes(const char *p, char **ret) {
+
+        static const char suffixes[] =
+                ".xz\0"
+                ".gz\0"
+                ".bz2\0"
+                ".sysext.raw\0"
+                ".confext.raw\0"
+                ".raw\0"
+                ".qcow2\0"
+                ".img\0"
+                ".bin\0";
+
+        _cleanup_free_ char *q = NULL;
+
+        q = strdup(p);
+        if (!q)
+                return -ENOMEM;
+
+        for (;;) {
+                bool changed = false;
+
+                NULSTR_FOREACH(sfx, suffixes) {
+                        char *e;
+
+                        e = endswith(q, sfx);
+                        if (e) {
+                                *e = 0;
+                                changed = true;
+                        }
+                }
+
+                if (!changed)
+                        break;
+        }
+
+        *ret = TAKE_PTR(q);
+
+        return 0;
+}
+
+int import_assign_pool_quota_and_warn(const char *path) {
+        int r;
+
+        assert(path);
+
+        r = btrfs_subvol_auto_qgroup(path, 0, true);
+        if (r == -ENOTTY) {
+                log_debug_errno(r, "Failed to set up quota hierarchy for %s, as directory is not on btrfs or not a subvolume. Ignoring.", path);
+                return 0;
+        }
+        if (r < 0)
+                return log_error_errno(r, "Failed to set up default quota hierarchy for %s: %m", path);
+        if (r > 0)
+                log_debug("Set up default quota hierarchy for %s.", path);
+
+        return 0;
+}
+
+int import_set_nocow_and_log(int fd, const char *path) {
+        int r;
+
+        r = chattr_fd(fd, FS_NOCOW_FL, FS_NOCOW_FL, NULL);
+        if (r < 0)
+                return log_full_errno(
+                                ERRNO_IS_NOT_SUPPORTED(r) ? LOG_DEBUG : LOG_WARNING,
+                                r, "Failed to set file attributes on %s: %m", path);
+
+        return 0;
+}