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-rw-r--r--src/shared/import-util.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/src/shared/import-util.c b/src/shared/import-util.c
new file mode 100644
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--- /dev/null
+++ b/src/shared/import-util.c
@@ -0,0 +1,232 @@
+/* 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"
+ ".raw\0"
+ ".qcow2\0"
+ ".img\0"
+ ".bin\0";
+
+ _cleanup_free_ char *q = NULL;
+
+ q = strdup(p);
+ if (!q)
+ return -ENOMEM;
+
+ for (;;) {
+ const char *sfx;
+ 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;
+}