tools: zip: fetch SOURCE_DATE_EPOCH directly

Remove "--mtime" option introduced in commit 18c9faa03211 ("tools: zip:
add option for reproducible archives") and instead fetch SOURCE_DATE_EPOCH
environment variable directly in the code.

Ref: https://sourceforge.net/p/infozip/patches/25/
Signed-off-by: Sungbo Eo <mans0n@gorani.run>

include/image-commands.mk

@@ -542,7 +542,6 @@ define Build/zip
 	mkdir $@.tmp
 	mv $@ $@.tmp/$(word 1,$(1))
 	TZ=UTC $(STAGING_DIR_HOST)/bin/zip -j -X \
-		$(if $(SOURCE_DATE_EPOCH),--mtime="$(SOURCE_DATE_EPOCH)") \
 		$(wordlist 2,$(words $(1)),$(1)) \
 		$@ $@.tmp/$(if $(word 1,$(1)),$(word 1,$(1)),$$(basename $@))
 	rm -rf $@.tmp

tools/zip/patches/011-add-option-for-reproducible-archives.patch

@@ -1,145 +0,0 @@
-From 6d659fc87451c02c8777dc33f750b16834e4c715 Mon Sep 17 00:00:00 2001
-From: Mathias Kresin <dev@kresin.me>
-Date: Sat, 12 Jan 2019 19:33:33 +0100
-Subject: [PATCH] add option for reproducible archives
-
-Add the option -mt/--mtime to pass a timestamp which is used as filedate
-for the containing files.
-
-So far, it isn't used for anything written to the extra fields,
-therefore requires the -X (eXclude eXtra file attributes) parameter to
-be effective.
-
-Signed-off-by: Mathias Kresin <dev@kresin.me>
----
- globals.c |  1 +
- util.c    | 22 ++++++++++++++++++++++
- zip.c     |  6 ++++++
- zip.h     |  1 +
- zipup.c   |  4 +++-
- 5 files changed, 33 insertions(+), 1 deletion(-)
-
---- a/globals.c
-+++ b/globals.c
-@@ -205,6 +205,7 @@ uzoff_t bytes_this_split = 0;     /* byt
- int read_split_archive = 0;       /* 1=scanzipf_reg detected spanning signature */
- int split_method = 0;             /* 0=no splits, 1=seekable, 2=data desc, -1=no */
- uzoff_t split_size = 0;           /* how big each split should be */
-+time_t timestamp = -1;             /* fixed timestamp for archive content filedate */
- int split_bell = 0;               /* when pause for next split ring bell */
- uzoff_t bytes_prev_splits = 0;    /* total bytes written to all splits before this */
- uzoff_t bytes_this_entry = 0;     /* bytes written for this entry across all splits */
---- a/util.c
-+++ b/util.c
-@@ -1217,6 +1217,7 @@ int DisplayNumString(file, i)
-   return 0;
- }
- 
-+
- /* Read numbers with trailing size multiplier (like 10M) and return number.
-    10/30/04 EG */
- 
-@@ -1279,6 +1280,29 @@ uzoff_t ReadNumString( numstring )
- }
- 
- 
-+uzoff_t ReadNumStringUL( numstring )
-+  char *numstring;
-+{
-+  zoff_t num = 0;
-+
-+  /* check if valid number (currently no negatives) */
-+  if (numstring == NULL) {
-+    zipwarn("Unable to read empty number in ReadNumString", "");
-+    return (uzoff_t)-1;
-+  }
-+  if (numstring[0] < '0' || numstring[0] > '9') {
-+    zipwarn("Unable to read number (must start with digit): ", numstring);
-+    return (uzoff_t)-1;
-+  }
-+  if (strlen(numstring) > 10) {
-+    zipwarn("Number too long to read (10 characters max): ", numstring);
-+    return (uzoff_t)-1;
-+  }
-+
-+  return (uzoff_t)atoll(numstring);
-+}
-+
-+
- /* Write the number as a string with a multiplier (like 10M) to outstring.
-    Always writes no more than 3 digits followed maybe by a multiplier and
-    returns the characters written or -1 if error.
---- a/zip.c
-+++ b/zip.c
-@@ -1942,6 +1942,7 @@ int set_filetype(out_path)
- #ifdef UNICODE_TEST
- #define o_sC            0x146
- #endif
-+#define o_mt            0x255
- 
- 
- /* the below is mainly from the old main command line
-@@ -2036,6 +2037,7 @@ struct option_struct far options[] = {
-     {"m",  "move",        o_NO_VALUE,       o_NOT_NEGATABLE, 'm',  "add files to archive then delete files"},
-     {"mm", "",            o_NO_VALUE,       o_NOT_NEGATABLE, o_mm, "not used"},
-     {"MM", "must-match",  o_NO_VALUE,       o_NOT_NEGATABLE, o_MM, "error if in file not matched/not readable"},
-+    {"mt", "mtime",       o_REQUIRED_VALUE, o_NOT_NEGATABLE, o_mt, "use fixed timestamp for archive content filedate"},
-     {"n",  "suffixes",    o_REQUIRED_VALUE, o_NOT_NEGATABLE, 'n',  "suffixes to not compress: .gz:.zip"},
-     {"nw", "no-wild",     o_NO_VALUE,       o_NOT_NEGATABLE, o_nw, "no wildcards during add or update"},
- #if defined(AMIGA) || defined(MACOS)
-@@ -2440,6 +2442,7 @@ char **argv;            /* command line
-   split_method = 0;           /* 0=no splits, 1=update LHs, 2=data descriptors */
-   split_size = 0;             /* how big each split should be */
-   split_bell = 0;             /* when pause for next split ring bell */
-+  timestamp = -1;             /* fixed timestamp for archive content filedate */
-   bytes_prev_splits = 0;      /* total bytes written to all splits before this */
-   bytes_this_entry = 0;       /* bytes written for this entry across all splits */
-   noisy_splits = 0;           /* be verbose about creating splits */
-@@ -2897,6 +2900,9 @@ char **argv;            /* command line
-           dispose = 1;  break;
-         case o_MM:  /* Exit with error if input file can't be read */
-           bad_open_is_error = 1; break;
-+        case o_mt:  /* fixed timestamp for archive content filedate */
-+          timestamp = ReadNumStringUL(value);
-+          break;
-         case 'n':   /* Don't compress files with a special suffix */
-           special = value;
-           /* special = NULL; */ /* will be set at next argument */
---- a/zip.h
-+++ b/zip.h
-@@ -502,6 +502,7 @@ extern uzoff_t bytes_this_split; /* byte
- extern int read_split_archive;   /* 1=scanzipf_reg detected spanning signature */
- extern int split_method;         /* 0=no splits, 1=seekable, 2=data descs, -1=no */
- extern uzoff_t split_size;       /* how big each split should be */
-+extern time_t timestamp;         /* fixed timestamp for archive content filedate */
- extern int split_bell;           /* when pause for next split ring bell */
- extern uzoff_t bytes_prev_splits; /* total bytes written to all splits before this */
- extern uzoff_t bytes_this_entry; /* bytes written for this entry across all splits */
-@@ -789,6 +790,7 @@ char *zip_fzofft       OF((zoff_t, char
- int DisplayNumString OF ((FILE *file, uzoff_t i));
- int WriteNumString OF((uzoff_t num, char *outstring));
- uzoff_t ReadNumString OF((char *numstring));
-+uzoff_t ReadNumStringUL OF((char *numstring));
- 
- /* returns true if abbrev is abbreviation for string */
- int abbrevmatch OF((char *, char *, int, int));
---- a/zipup.c
-+++ b/zipup.c
-@@ -415,7 +415,6 @@ struct zlist far *z;    /* zip entry to
-   char *tempextra = NULL;
-   char *tempcextra = NULL;
- 
--
- #ifdef WINDLL
- # ifdef ZIP64_SUPPORT
-   extern _int64 filesize64;
-@@ -441,6 +440,9 @@ struct zlist far *z;    /* zip entry to
-   if (tim == 0 || q == (zoff_t) -3)
-     return ZE_OPEN;
- 
-+  if (timestamp > 0)
-+    tim = unix2dostime(&timestamp);
-+
-   /* q is set to -1 if the input file is a device, -2 for a volume label */
-   if (q == (zoff_t) -2) {
-      isdir = 1;

tools/zip/patches/011-reproducible-mtime.patch

@@ -0,0 +1,41 @@
+From 501ae4e93fd6fa2f7d20d00d1b011f9006802eae Mon Sep 17 00:00:00 2001
+From: "Bernhard M. Wiedemann" <bwiedemann@suse.de>
+Date: Fri, 3 May 2019 16:32:24 +0200
+Subject: [PATCH] Override mtime with zip -X
+
+with SOURCE_DATE_EPOCH
+to allow for reproducible builds of .zip files
+
+See https://reproducible-builds.org/ for why this is good
+and https://reproducible-builds.org/specs/source-date-epoch/
+for the definition of this variable.
+
+Uses clamping to keep older mtimes than SOURCE_DATE_EPOCH intact.
+---
+ zipup.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+--- a/zipup.c
++++ b/zipup.c
+@@ -414,6 +414,7 @@ struct zlist far *z;    /* zip entry to
+   ush tempcext = 0;
+   char *tempextra = NULL;
+   char *tempcextra = NULL;
++  const char *source_date_epoch;
+ 
+ 
+ #ifdef WINDLL
+@@ -674,6 +675,13 @@ struct zlist far *z;    /* zip entry to
+ 
+   } /* strcmp(z->name, "-") == 0 */
+ 
++  if (extra_fields == 0 && (source_date_epoch = getenv("SOURCE_DATE_EPOCH")) != NULL) {
++     time_t epoch = strtoull(source_date_epoch, NULL, 10);
++     if (epoch > 0) {
++       ulg epochtim = unix2dostime(&epoch);
++       if (z->tim > epochtim) z->tim = epochtim;
++     }
++  }
+   if (extra_fields == 2) {
+     unsigned len;
+     char *p;