tools/squashfs: add argument -fixed-time to set all timestamps

-fixed-time <timestamp> set mkfs-timestamp and file-mtime to this timestamp.
Reproducible builds requires the removal of all timestamp or setting all to a specific one.

Signed-off-by: Alexander Couzens <lynxis@fe80.eu>

SVN-Revision: 47858

1 files changed, 84 insertions, 0 deletions

diff --git a/tools/squashfs4/patches/200-add-fixed-timestamp-option.patch b/tools/squashfs4/patches/200-add-fixed-timestamp-option.patch
new file mode 100644
index 0000000000..7ac1765eed
--- /dev/null
+++ b/tools/squashfs4/patches/200-add-fixed-timestamp-option.patch
@@ -0,0 +1,84 @@
+Index: squashfs4.2/squashfs-tools/mksquashfs.c
+===================================================================
+--- squashfs4.2.orig/squashfs-tools/mksquashfs.c
++++ squashfs4.2/squashfs-tools/mksquashfs.c
+@@ -175,6 +175,9 @@ unsigned int cache_bytes = 0, cache_size
+ /* inode lookup table */
+ squashfs_inode *inode_lookup_table = NULL;
+ 
++/* override all timestamps */
++time_t fixed_time = -1;
++
+ /* in memory directory data */
+ #define I_COUNT_SIZE		128
+ #define DIR_ENTRIES		32
+@@ -2452,6 +2455,8 @@ again:
+ restat:
+ 	fstat(file, &buf2);
+ 	close(file);
++	if (fixed_time != -1)
++		buf2.st_mtime = fixed_time;
+ 	if(read_size != buf2.st_size) {
+ 		memcpy(buf, &buf2, sizeof(struct stat));
+ 		file_buffer->error = 2;
+@@ -3612,7 +3617,7 @@ void dir_scan(squashfs_inode *inode, cha
+ 		buf.st_mode = S_IRWXU | S_IRWXG | S_IRWXO | S_IFDIR;
+ 		buf.st_uid = getuid();
+ 		buf.st_gid = getgid();
+-		buf.st_mtime = time(NULL);
++		buf.st_mtime = fixed_time != -1 ? fixed_time : time(NULL);
+ 		buf.st_dev = 0;
+ 		buf.st_ino = 0;
+ 		dir_ent->inode = lookup_inode(&buf);
+@@ -3623,6 +3628,8 @@ void dir_scan(squashfs_inode *inode, cha
+ 				pathname, strerror(errno));
+ 			return;
+ 		}
++		if(fixed_time != -1)
++			buf.st_mtime = fixed_time;
+ 		dir_ent->inode = lookup_inode(&buf);
+ 	}
+ 
+@@ -3677,6 +3684,8 @@ struct dir_info *dir_scan1(char *pathnam
+ 				filename, strerror(errno));
+ 			continue;
+ 		}
++		if(fixed_time != -1)
++			buf.st_mtime = fixed_time;
+ 
+ 		if((buf.st_mode & S_IFMT) != S_IFREG &&
+ 			(buf.st_mode & S_IFMT) != S_IFDIR &&
+@@ -3795,7 +3804,7 @@ struct dir_info *dir_scan2(struct dir_in
+ 		buf.st_gid = pseudo_ent->dev->gid;
+ 		buf.st_rdev = makedev(pseudo_ent->dev->major,
+ 			pseudo_ent->dev->minor);
+-		buf.st_mtime = time(NULL);
++		buf.st_mtime = fixed_time != -1 ? fixed_time : time(NULL);
+ 		buf.st_ino = pseudo_ino ++;
+ 
+ 		if(pseudo_ent->dev->type == 'f') {
+@@ -4674,6 +4683,15 @@ int main(int argc, char *argv[])
+ 			progress = FALSE;
+ 		else if(strcmp(argv[i], "-no-exports") == 0)
+ 			exportable = FALSE;
++		else if(strcmp(argv[i], "-fixed-time") == 0) {
++			if((++i == argc) || (fixed_time =
++					strtoll(argv[i], &b, 10), *b != '\0')) {
++				ERROR("%s: -fixed-time missing or invalid "
++					"timestamp\n", argv[0]);
++
++				exit(1);
++			}
++		}
+ 		else if(strcmp(argv[i], "-processors") == 0) {
+ 			if((++i == argc) || (processors =
+ 					strtol(argv[i], &b, 10), *b != '\0')) {
+@@ -5314,7 +5332,7 @@ printOptions:
+ 	sBlk.flags = SQUASHFS_MKFLAGS(noI, noD, noF, noX, no_fragments,
+ 		always_use_fragments, duplicate_checking, exportable,
+ 		no_xattrs, comp_opts);
+-	sBlk.mkfs_time = time(NULL);
++	sBlk.mkfs_time = fixed_time != -1 ? fixed_time : time(NULL);
+ 
+ restore_filesystem:
+ 	if(progress && estimated_uncompressed) {