From 54282a81301fd506a934c2bb9801e1775e65e99d Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 31 Aug 2021 19:55:45 +0200
Subject: update-sources: add lock

---
 update-sources | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'update-sources')

diff --git a/update-sources b/update-sources
index 8cae06165..1b4e98daf 100755
--- a/update-sources
+++ b/update-sources
@@ -8,6 +8,12 @@ if [ $# -eq 0 ]; then
 
   [ -d "${srcDir}" ] || exit 0
 
+  lockFile="${srcDir}/.lock"
+  if [ -s "${lockFile}" ] && kill -0 "$(cat "${lockFile}")"; then
+    exit
+  fi
+  echo $$ >"${lockFile}"
+
   find "${srcDir}" \
     -type d \
     -exec sh -c 'test -f "{}/HEAD"' \; \
@@ -19,6 +25,8 @@ if [ $# -eq 0 ]; then
     -prune \
   | parallel -j 0 -l 1 "$0"
 
+  rm -f "${lockFile}"
+
 elif [ $# -eq 1 ]; then
 
   case "${1%%: *}" in
-- 
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