Hi Guifu,

On Sat, Oct 12, 2019 at 01:09:52AM +0800, Li Guifu wrote:
> Introduce option "-T" for UNIX timestamp.
> 
> Signed-off-by: Li Guifu <[email protected]>
> ---

Applied with the following minor changes.
Let me know if you have some other thoughts...

>From 0da0c97cc5ca7e02192ee99dde0a82cb531823a6 Mon Sep 17 00:00:00 2001
From: Li Guifu <[email protected]>
Date: Sat, 12 Oct 2019 01:09:52 +0800
Subject: [PATCH] erofs-utils: introduce fixed UNIX timestamp

Introduce option "-T" for UNIX timestamp.

Signed-off-by: Li Guifu <[email protected]>
[ Gao Xiang: use u64 for timestamp rather than long long. ]
Signed-off-by: Gao Xiang <[email protected]>
---
 include/erofs/config.h |  1 +
 lib/config.c           |  1 +
 mkfs/main.c            | 16 ++++++++++++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/include/erofs/config.h b/include/erofs/config.h
index 8b09430..9711638 100644
--- a/include/erofs/config.h
+++ b/include/erofs/config.h
@@ -28,6 +28,7 @@ struct erofs_configure {
        char *c_compr_alg_master;
        int c_compr_level_master;
        int c_force_inodeversion;
+       u64 c_unix_timestamp;
 };
 
 extern struct erofs_configure cfg;
diff --git a/lib/config.c b/lib/config.c
index 110c8b6..4cddc25 100644
--- a/lib/config.c
+++ b/lib/config.c
@@ -23,6 +23,7 @@ void erofs_init_configure(void)
        cfg.c_compr_level_master = -1;
        sbi.feature_incompat = EROFS_FEATURE_INCOMPAT_LZ4_0PADDING;
        cfg.c_force_inodeversion = 0;
+       cfg.c_unix_timestamp = -1;
 }
 
 void erofs_show_config(void)
diff --git a/mkfs/main.c b/mkfs/main.c
index 4b279c0..6ecc905 100644
--- a/mkfs/main.c
+++ b/mkfs/main.c
@@ -29,6 +29,7 @@ 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)
@@ -90,9 +91,10 @@ static int parse_extended_opts(const char *opts)
 
 static int mkfs_parse_options_cfg(int argc, char *argv[])
 {
+       char *endptr;
        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) {
@@ -125,6 +127,13 @@ static int mkfs_parse_options_cfg(int argc, char *argv[])
                        if (opt)
                                return opt;
                        break;
+               case 'T':
+                       cfg.c_unix_timestamp = strtoull(optarg, &endptr, 0);
+                       if (cfg.c_unix_timestamp == -1 || *endptr != '\0') {
+                               erofs_err("invalid UNIX timestamp %s", optarg);
+                               return -EINVAL;
+                       }
+                       break;
 
                default: /* '?' */
                        return -EINVAL;
@@ -223,7 +232,10 @@ 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

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