From 4cc0d685f1d741e84f126ca1eb91f16b602d023d Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Sun, 30 Apr 2023 16:45:17 -0400
Subject: ustar: Set mtime in written header

---
(limited to 'src')

diff --git a/src/ustar.c b/src/ustar.c
index 0ecf36a..a2ab0f8 100644
--- a/src/ustar.c
+++ b/src/ustar.c
@@ -265,6 +265,23 @@ opkg_opk_ustar_read(struct opkg_opk_ustar *ustar, char **buffer, size_t *size)
 	return OPKG_OPK_OK;
 }
 
+static int
+_opkg_opk_ustar_source_date_epoch(int64_t *mtime)
+{
+	char *env;
+	char *end;
+
+	env = getenv("SOURCE_DATE_EPOCH");
+	if (env == NULL) {
+		return OPKG_OPK_ERROR;
+	}
+	*mtime = strtol(env, &end, 10);
+	if (*end != '\0') {
+		return OPKG_OPK_ERROR;
+	}
+	return OPKG_OPK_OK;
+}
+
 int
 opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 		struct opkg_opk_dirent *dirent, uint16_t mode,
@@ -272,6 +289,7 @@ opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 		uint64_t size, char type, const char *linkname)
 {
 	size_t    linkname_len;
+	int64_t   mtime;
 	uint32_t  chksum;
 	size_t    i;
 	char     *header_uc;
@@ -320,6 +338,11 @@ opkg_opk_ustar_write_header(struct opkg_opk_ustar *ustar,
 	memset(ustar->header.linkname, 0,
 			sizeof(ustar->header.linkname) - linkname_len);
 
+	if (_opkg_opk_ustar_source_date_epoch(&mtime) == OPKG_OPK_ERROR) {
+		return OPKG_OPK_ERROR;
+	}
+	sprintf(ustar->header.mtime, "%o", mtime);
+
 	strcpy(ustar->header.magic, "ustar");
 	memcpy(ustar->header.version, "00", 2);
 	chksum = 0;
--
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