diff options
Diffstat (limited to '')
-rw-r--r-- | src/shared/mkfs-util.c | 277 |
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; +} |