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/* 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 (;;) {
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;
}
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