From 5284c12274f0d81dc2fac978cc703072897696fd Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Mon, 3 Jul 2017 12:31:30 +0200
Subject: bin/get-package-updates: do nothing if nothing changed

---
 bin/get-package-updates | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'bin/get-package-updates')

diff --git a/bin/get-package-updates b/bin/get-package-updates
index b292932..12ae82f 100755
--- a/bin/get-package-updates
+++ b/bin/get-package-updates
@@ -101,6 +101,8 @@ done
 
 # Read previous git revision numbers from files.
 
+something_new=false
+
 for repo in ${repo_names}; do
   eval "old_repo_revisions__${repo}='$(
     cat "${work_dir}/${repo}.revision" 2> /dev/null || \
@@ -111,8 +113,17 @@ for repo in ${repo_names}; do
     git -C "${repo_path}" rev-parse HEAD | \
       tee "${work_dir}/${repo}.revision.new"
   )'"
+  eval 'if ! [ "${new_repo_revisions__'"${repo}"'}" = "${old_repo_revisions__'"${repo}"'}" ]; then
+    something_new=true
+  fi'
 done
 
+if ${pull} && \
+  ! ${something_new}; then
+  >&2 echo 'Nothing changed.'
+  exit
+fi
+
 # Create a lock file for build list.
 
 exec 9> "${build_list_lock_file}"
-- 
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