mkfs: add option to use a pre-defined UUID
Usage: mkfs.erofs -U<uuid> <imagefile> <srcdir>
The filesystem UUID can now be optionally specified during filesystem
creation. The default behavior is still to generate a random UUID.
This is useful for reproducible builds.
Link: https://lore.kernel.org/r/20201030123020.133084-4-hsiangkao@redhat.com
Reviewed-by: Li Guifu <bluce.lee@aliyun.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
diff --git a/man/mkfs.erofs.1 b/man/mkfs.erofs.1
index 891c5a8..dcaf9d7 100644
--- a/man/mkfs.erofs.1
+++ b/man/mkfs.erofs.1
@@ -52,6 +52,12 @@
Set all files to the given UNIX timestamp. Reproducible builds requires setting
all to a specific one.
.TP
+.BI "\-U " UUID
+Set the universally unique identifier (UUID) of the filesystem to
+.IR UUID .
+The format of the UUID is a series of hex digits separated by hyphens,
+like this: "c1b9d5a2-f162-11cf-9ece-0020afc76f16".
+.TP
.BI "\-\-exclude-path=" path
Ignore file that matches the exact literal path.
You may give multiple `--exclude-path' options.
diff --git a/mkfs/main.c b/mkfs/main.c
index 0e17314..c63b274 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -66,6 +66,9 @@
" -x# set xattr tolerance to # (< 0, disable xattrs; default 2)\n"
" -EX[,...] X=extended options\n"
" -T# set a fixed UNIX timestamp # to all files\n"
+#ifdef HAVE_LIBUUID
+ " -UX use a given filesystem UUID\n"
+#endif
" --exclude-path=X avoid including file X (X = exact literal path)\n"
" --exclude-regex=X avoid including files that match X (X = regular expression)\n"
#ifdef HAVE_LIBSELINUX
@@ -149,7 +152,7 @@
char *endptr;
int opt, i;
- while((opt = getopt_long(argc, argv, "d:x:z:E:T:",
+ while((opt = getopt_long(argc, argv, "d:x:z:E:T:U:",
long_options, NULL)) != -1) {
switch (opt) {
case 'z':
@@ -200,6 +203,14 @@
}
cfg.c_timeinherit = TIMESTAMP_FIXED;
break;
+#ifdef HAVE_LIBUUID
+ case 'U':
+ if (uuid_parse(optarg, sbi.uuid)) {
+ erofs_err("invalid UUID %s", optarg);
+ return -EINVAL;
+ }
+ break;
+#endif
case 2:
opt = erofs_parse_exclude_path(optarg, false);
if (opt) {
