From 35e6cf8b9a26e767615b773cceafb543484b75ef Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Tue, 09 Apr 2019 22:55:23 -0400
Subject: garbage: Replace use of non-portable %s date spec

---
(limited to 'src')

diff --git a/src/garbage.sh b/src/garbage.sh
index 58dab41..556f3db 100644
--- a/src/garbage.sh
+++ b/src/garbage.sh
@@ -20,6 +20,24 @@
 # along with the ProteanOS Archive Manager.  If not, see
 # <http://www.gnu.org/licenses/>.
 
+time()
+{
+	# Based on code from <https://www.etalabs.net/sh_tricks.html> by Rich
+	# Felker, with whitespace added for readability.
+	printf '%d' $(($(TZ=UTC0 date "+
+		(
+			  (%Y - 1600) * 365
+			+ (%Y - 1600) / 4
+			- (%Y - 1600) / 100
+			+ (%Y - 1600) / 400
+			+ 1%j - 1000
+			- 135140
+		) * 86400
+		+ (1%H - 100) * 3600
+		+ (1%M - 100) * 60
+		+ (1%S - 100)")))
+}
+
 collect_garbage()
 {
 	local cur_time=
@@ -30,9 +48,7 @@ collect_garbage()
 
 	info_v "$(get_msg 'collecting_garbage')"
 
-	# NB: The %s format conversion specifier is not specified by POSIX, but
-	# it is supported by the GNU and BusyBox implementations of date.
-	cur_time=$("${DATE}" '+%s')
+	cur_time=$(time)
 
 	for garbage in "${base_dir}/.db/garbage/"*; do
 		if [ ! -f "${garbage}" ]; then
@@ -64,9 +80,7 @@ mark_pool_garbage()
 
 	info_v "$(get_msg 'marking_garbage_file')" "${file}"
 
-	# NB: The %s format conversion specifier is not specified by POSIX, but
-	# it is supported by the GNU and BusyBox implementations of date.
-	time=$(date '+%s')
+	time=$(time)
 	time=$(($time + $conf_pool_gc_delay))
 
 	mkdir -p "${base_dir}/.db/garbage"
--
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