[PATCH v4][ 1/2] erofs-utils: introduce fixed UNIX timestamp

[Li Guifu <blucerlee@gmail.com>]

Introduce option "-T" for UNIX timestamp.

Signed-off-by: Li Guifu <blucerlee@gmail.com>
---
 include/erofs/config.h |  1 +
 lib/config.c           |  1 +
 mkfs/main.c            | 11 +++++++++--
 3 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/include/erofs/config.h b/include/erofs/config.h
index fde936c..8df05a1 100644
--- a/include/erofs/config.h
+++ b/include/erofs/config.h
@@ -30,6 +30,7 @@ struct erofs_configure {
 	int c_force_inodeversion;
 	/* < 0, xattr disabled and INT_MAX, always use inline xattrs */
 	int c_inline_xattr_tolerance;
+	long long c_unix_timestamp;
 };
 
 extern struct erofs_configure cfg;
diff --git a/lib/config.c b/lib/config.c
index dc10754..cee835c 100644
--- a/lib/config.c
+++ b/lib/config.c
@@ -24,6 +24,7 @@ void erofs_init_configure(void)
 	sbi.feature_incompat = EROFS_FEATURE_INCOMPAT_LZ4_0PADDING;
 	cfg.c_force_inodeversion = 0;
 	cfg.c_inline_xattr_tolerance = 2;
+	cfg.c_unix_timestamp = -1;
 }
 
 void erofs_show_config(void)
diff --git a/mkfs/main.c b/mkfs/main.c
index 978c5b4..77a4b78 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -30,6 +30,7 @@ static void usage(void)
 	fprintf(stderr, " -zX[,Y]   X=compressor (Y=compression level, optional)\n");
 	fprintf(stderr, " -d#       set output message level to # (maximum 9)\n");
 	fprintf(stderr, " -EX[,...] X=extended options\n");
+	fprintf(stderr, " -T#       set a fixed UNIX timestamp # to all files\n");
 }
 
 static int parse_extended_opts(const char *opts)
@@ -93,7 +94,7 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
 {
 	int opt, i;
 
-	while ((opt = getopt(argc, argv, "d:z:E:")) != -1) {
+	while ((opt = getopt(argc, argv, "d:z:E:T:")) != -1) {
 		switch (opt) {
 		case 'z':
 			if (!optarg) {
@@ -126,6 +127,9 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
 			if (opt)
 				return opt;
 			break;
+		case 'T':
+			cfg.c_unix_timestamp = atoll(optarg);
+			break;
 
 		default: /* '?' */
 			return -EINVAL;
@@ -224,7 +228,10 @@ int main(int argc, char **argv)
 		return 1;
 	}
 
-	if (!gettimeofday(&t, NULL)) {
+	if (cfg.c_unix_timestamp != -1) {
+		sbi.build_time      = cfg.c_unix_timestamp;
+		sbi.build_time_nsec = 0;
+	} else if (!gettimeofday(&t, NULL)) {
 		sbi.build_time      = t.tv_sec;
 		sbi.build_time_nsec = t.tv_usec;
 	}
-- 
2.17.1