Add utils/lint.sh

Signed-off-by: Drew DeVault <sir@cmpwn.com>

.builds/alpine.yml

@@ -12,6 +12,9 @@ packages:
 sources:
   - https://codeberg.org/redict/redict.git
 tasks:
+  - lint: |
+      cd redict
+      ./utils/lint.sh
   - make: |
       cd redict
       make -C src V=1 USE_JEMALLOC=no MALLOC=libc BUILD_TLS=yes

utils/lint.sh

@@ -0,0 +1,23 @@
+#!/bin/sh -e
+signoff() {
+    if ! git log --format='%b' HEAD^.. | grep 'Signed-off-by' >/dev/null
+    then
+        echo "Missing sign-off" >&2
+        return 1
+    fi
+}
+
+exitcode=0
+for step in signoff
+do
+    if ! $step
+    then
+        exitcode=1
+    fi
+done
+
+if [ $exitcode -eq 0 ]
+then
+    echo "Everything looks good!"
+fi
+exit $exitcode