phar: honor SOURCE_DATE_EPOCH for timestamps

ext/phar/phar.c

@@ -3002,7 +3002,7 @@ int phar_flush(phar_archive_data *phar, char *user_stub, zend_long len, int conv
 			4: metadata-len
 			+: metadata
 		*/
-		mytime = time(NULL);
+		mytime = source_date_epoch_time(NULL);
 		phar_set_32(entry_buffer, entry->uncompressed_filesize);
 		phar_set_32(entry_buffer+4, mytime);
 		phar_set_32(entry_buffer+8, entry->compressed_filesize);

ext/phar/phar_internal.h

@@ -425,6 +425,22 @@ static inline enum phar_fp_type phar_get_fp_type(phar_entry_info *entry)
 	return PHAR_G(cached_fp)[entry->phar->phar_pos].manifest[entry->manifest_pos].fp_type;
 }
 
+static inline time_t source_date_epoch_time(time_t *tloc)
+{
+	zend_string *str = php_getenv("SOURCE_DATE_EPOCH", sizeof("SOURCE_DATE_EPOCH")-1);
+
+	if (str) {
+		time_t t = strtoul(ZSTR_VAL(str), NULL, 10);
+
+		zend_string_release(str);
+		if (tloc) {
+			*tloc = t;
+		}
+		return t;
+	}
+	return time(tloc);
+}
+
 static inline zend_off_t phar_get_fp_offset(phar_entry_info *entry)
 {
 	if (!entry->is_persistent) {

ext/phar/stream.c

@@ -463,7 +463,7 @@ static int phar_stream_flush(php_stream *stream) /* {{{ */
 	phar_entry_data *data = (phar_entry_data *) stream->abstract;
 
 	if (data->internal_file->is_modified) {
-		data->internal_file->timestamp = time(0);
+		data->internal_file->timestamp = source_date_epoch_time(0);
 		ret = phar_flush(data->phar, 0, 0, 0, &error);
 		if (error) {
 			php_stream_wrapper_log_error(stream->wrapper, REPORT_ERRORS, "%s", error);

ext/phar/tar.c

@@ -971,7 +971,7 @@ int phar_tar_flush(phar_archive_data *phar, char *user_stub, zend_long len, int
 	char halt_stub[] = "__HALT_COMPILER();";
 
 	entry.flags = PHAR_ENT_PERM_DEF_FILE;
-	entry.timestamp = time(NULL);
+	entry.timestamp = source_date_epoch_time(NULL);
 	entry.is_modified = 1;
 	entry.is_crc_checked = 1;
 	entry.is_tar = 1;

ext/phar/util.c

@@ -574,7 +574,7 @@ phar_entry_data *phar_get_or_create_entry_data(char *fname, size_t fname_len, ch
 
 	phar_add_virtual_dirs(phar, path, path_len);
 	etemp.is_modified = 1;
-	etemp.timestamp = time(0);
+	etemp.timestamp = source_date_epoch_time(0);
 	etemp.is_crc_checked = 1;
 	etemp.phar = phar;
 	etemp.filename = estrndup(path, path_len);

ext/phar/zip.c

@@ -1185,7 +1185,7 @@ int phar_zip_flush(phar_archive_data *phar, char *user_stub, zend_long len, int
 
 	pass.error = &temperr;
 	entry.flags = PHAR_ENT_PERM_DEF_FILE;
-	entry.timestamp = time(NULL);
+	entry.timestamp = source_date_epoch_time(NULL);
 	entry.is_modified = 1;
 	entry.is_zip = 1;
 	entry.phar = phar;