[PATCH v2 1/4] build: Fix Shellcheck for get_source_date_epoch.sh

[Paul Spooren]

If a `cd` to `TOPDIR` fails the script should quit.

Also unify `try_mtime` function by storing it in a variable.

Signed-off-by: Paul Spooren <mail at aparcar.org>
---
 scripts/get_source_date_epoch.sh | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/get_source_date_epoch.sh b/scripts/get_source_date_epoch.sh
index 84ba445454..bd3384a761 100755
--- a/scripts/get_source_date_epoch.sh
+++ b/scripts/get_source_date_epoch.sh
@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 export LANG=C
 export LC_ALL=C
-[ -n "$TOPDIR" ] && cd $TOPDIR
+[ -n "$TOPDIR" ] && (cd "$TOPDIR" || exit 1)
 
 try_version() {
 	[ -f version.date ] || return 1
@@ -22,7 +22,7 @@ try_hg() {
 }
 
 try_mtime() {
-	perl -e 'print((stat $ARGV[0])[9])' "$0"
+	SOURCE_DATE_EPOCH=$(perl -e 'print((stat $ARGV[0])[9])' "$0")
 	[ -n "$SOURCE_DATE_EPOCH" ]
 }
 
-- 
2.25.1