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Diffstat (limited to '')
| -rw-r--r-- | src/shared/import-util.c | 232 |
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 index 0000000..97d39ee --- /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; +} |