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-rw-r--r--src/shared/mkfs-util.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/src/shared/mkfs-util.c b/src/shared/mkfs-util.c
new file mode 100644
index 0000000..741a0da
--- /dev/null
+++ b/src/shared/mkfs-util.c
@@ -0,0 +1,277 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <unistd.h>
+
+#include "id128-util.h"
+#include "mkfs-util.h"
+#include "mountpoint-util.h"
+#include "path-util.h"
+#include "process-util.h"
+#include "stdio-util.h"
+#include "string-util.h"
+#include "utf8.h"
+
+int mkfs_exists(const char *fstype) {
+ const char *mkfs;
+ int r;
+
+ assert(fstype);
+
+ if (STR_IN_SET(fstype, "auto", "swap")) /* these aren't real file system types, refuse early */
+ return -EINVAL;
+
+ mkfs = strjoina("mkfs.", fstype);
+ if (!filename_is_valid(mkfs)) /* refuse file system types with slashes and similar */
+ return -EINVAL;
+
+ r = find_executable(mkfs, NULL);
+ if (r == -ENOENT)
+ return false;
+ if (r < 0)
+ return r;
+
+ return true;
+}
+
+static int mangle_linux_fs_label(const char *s, size_t max_len, char **ret) {
+ /* Not more than max_len bytes (12 or 16) */
+
+ assert(s);
+ assert(max_len > 0);
+ assert(ret);
+
+ const char *q;
+ char *ans;
+
+ for (q = s; *q;) {
+ int l;
+
+ l = utf8_encoded_valid_unichar(q, SIZE_MAX);
+ if (l < 0)
+ return l;
+
+ if ((size_t) (q - s + l) > max_len)
+ break;
+ q += l;
+ }
+
+ ans = memdup_suffix0(s, q - s);
+ if (!ans)
+ return -ENOMEM;
+
+ *ret = ans;
+ return 0;
+}
+
+static int mangle_fat_label(const char *s, char **ret) {
+ assert(s);
+
+ _cleanup_free_ char *q = NULL;
+ int r;
+
+ r = utf8_to_ascii(s, '_', &q);
+ if (r < 0)
+ return r;
+
+ /* Classic FAT only allows 11 character uppercase labels */
+ strshorten(q, 11);
+ ascii_strupper(q);
+
+ /* mkfs.vfat: Labels with characters *?.,;:/\|+=<>[]" are not allowed.
+ * Let's also replace any control chars. */
+ for (char *p = q; *p; p++)
+ if (strchr("*?.,;:/\\|+=<>[]\"", *p) || char_is_cc(*p))
+ *p = '_';
+
+ *ret = TAKE_PTR(q);
+ return 0;
+}
+
+int make_filesystem(
+ const char *node,
+ const char *fstype,
+ const char *label,
+ const char *root,
+ sd_id128_t uuid,
+ bool discard) {
+
+ _cleanup_free_ char *mkfs = NULL, *mangled_label = NULL;
+ char vol_id[CONST_MAX(SD_ID128_UUID_STRING_MAX, 8U + 1U)] = {};
+ int r;
+
+ assert(node);
+ assert(fstype);
+ assert(label);
+
+ if (fstype_is_ro(fstype) && !root)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "Cannot generate read-only filesystem %s without a source tree.",
+ fstype);
+
+ if (streq(fstype, "swap")) {
+ if (root)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "A swap filesystem can't be populated, refusing");
+ r = find_executable("mkswap", &mkfs);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mkswap binary not available.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mkswap binary exists: %m");
+ } else if (streq(fstype, "squashfs")) {
+ r = find_executable("mksquashfs", &mkfs);
+ if (r == -ENOENT)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mksquashfs binary not available.");
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mksquashfs binary exists: %m");
+ } else if (fstype_is_ro(fstype)) {
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Don't know how to create read-only file system '%s', refusing.",
+ fstype);
+ } else {
+ if (root)
+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
+ "Populating with source tree is only supported for read-only filesystems");
+ r = mkfs_exists(fstype);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine whether mkfs binary for %s exists: %m", fstype);
+ if (r == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mkfs binary for %s is not available.", fstype);
+
+ mkfs = strjoin("mkfs.", fstype);
+ if (!mkfs)
+ return log_oom();
+ }
+
+ if (STR_IN_SET(fstype, "ext2", "ext3", "ext4", "xfs", "swap")) {
+ size_t max_len =
+ streq(fstype, "xfs") ? 12 :
+ streq(fstype, "swap") ? 15 :
+ 16;
+
+ r = mangle_linux_fs_label(label, max_len, &mangled_label);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine volume label from string \"%s\": %m", label);
+ label = mangled_label;
+
+ } else if (streq(fstype, "vfat")) {
+ r = mangle_fat_label(label, &mangled_label);
+ if (r < 0)
+ return log_error_errno(r, "Failed to determine FAT label from string \"%s\": %m", label);
+ label = mangled_label;
+
+ xsprintf(vol_id, "%08" PRIx32,
+ ((uint32_t) uuid.bytes[0] << 24) |
+ ((uint32_t) uuid.bytes[1] << 16) |
+ ((uint32_t) uuid.bytes[2] << 8) |
+ ((uint32_t) uuid.bytes[3])); /* Take first 32 bytes of UUID */
+ }
+
+ if (isempty(vol_id))
+ assert_se(sd_id128_to_uuid_string(uuid, vol_id));
+
+ r = safe_fork("(mkfs)", FORK_RESET_SIGNALS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_LOG|FORK_WAIT|FORK_STDOUT_TO_STDERR, NULL);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ /* Child */
+
+ /* When changing this conditional, also adjust the log statement below. */
+ if (streq(fstype, "ext2"))
+ (void) execlp(mkfs, mkfs,
+ "-q",
+ "-L", label,
+ "-U", vol_id,
+ "-I", "256",
+ "-m", "0",
+ "-E", discard ? "discard,lazy_itable_init=1" : "nodiscard,lazy_itable_init=1",
+ "-T", "default",
+ node, NULL);
+
+ else if (STR_IN_SET(fstype, "ext3", "ext4"))
+ (void) execlp(mkfs, mkfs,
+ "-q",
+ "-L", label,
+ "-U", vol_id,
+ "-I", "256",
+ "-O", "has_journal",
+ "-m", "0",
+ "-E", discard ? "discard,lazy_itable_init=1" : "nodiscard,lazy_itable_init=1",
+ "-T", "default",
+ node, NULL);
+
+ else if (streq(fstype, "btrfs")) {
+ (void) execlp(mkfs, mkfs,
+ "-q",
+ "-L", label,
+ "-U", vol_id,
+ node,
+ discard ? NULL : "--nodiscard",
+ NULL);
+
+ } else if (streq(fstype, "f2fs")) {
+ (void) execlp(mkfs, mkfs,
+ "-q",
+ "-g", /* "default options" */
+ "-f", /* force override, without this it doesn't seem to want to write to an empty partition */
+ "-l", label,
+ "-U", vol_id,
+ "-t", one_zero(discard),
+ node,
+ NULL);
+
+ } else if (streq(fstype, "xfs")) {
+ const char *j;
+
+ j = strjoina("uuid=", vol_id);
+
+ (void) execlp(mkfs, mkfs,
+ "-q",
+ "-L", label,
+ "-m", j,
+ "-m", "reflink=1",
+ node,
+ discard ? NULL : "-K",
+ NULL);
+
+ } else if (streq(fstype, "vfat"))
+
+ (void) execlp(mkfs, mkfs,
+ "-i", vol_id,
+ "-n", label,
+ "-F", "32", /* yes, we force FAT32 here */
+ node, NULL);
+
+ else if (streq(fstype, "swap"))
+ /* TODO: add --quiet here if
+ * https://github.com/util-linux/util-linux/issues/1499 resolved. */
+
+ (void) execlp(mkfs, mkfs,
+ "-L", label,
+ "-U", vol_id,
+ node, NULL);
+
+ else if (streq(fstype, "squashfs"))
+
+ (void) execlp(mkfs, mkfs,
+ root, node,
+ "-quiet",
+ "-noappend",
+ NULL);
+ else
+ /* Generic fallback for all other file systems */
+ (void) execlp(mkfs, mkfs, node, NULL);
+
+ log_error_errno(errno, "Failed to execute %s: %m", mkfs);
+
+ _exit(EXIT_FAILURE);
+ }
+
+ if (STR_IN_SET(fstype, "ext2", "ext3", "ext4", "btrfs", "f2fs", "xfs", "vfat", "swap"))
+ log_info("%s successfully formatted as %s (label \"%s\", uuid %s)",
+ node, fstype, label, vol_id);
+ else
+ log_info("%s successfully formatted as %s (no label or uuid specified)",
+ node, fstype);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 13:15:36 +0000