add linting

.gitlab-ci.yml

@@ -0,0 +1,9 @@
+image: bash
+
+stages:
+    - lint
+    - test
+
+lint:
+    stage: install
+    script: 'apk add shellcheck && shellcheck .bash* bin/*'

bin/gitlab-backup.sh

@@ -10,7 +10,7 @@
 
 # Create a time-stamped .tar file in the current directory.
 # The .tar file will be readable only to root.
-cd /var/opt/gitlab/backups/
+cd /var/opt/gitlab/backups/ || exit
 sh -c 'umask 0077; tar -cf $(date "+%s-%F-etc-gitlab.tar") -C / etc/gitlab'
 
 # run GitLab system backup 

bin/install-dotfiles.sh

@@ -7,16 +7,16 @@ for FILE in $FILES; do
 
     # remove old versions
     if [ -f "$HOME/$FILE" ]; then
-        rm $HOME/$FILE
+        rm "$HOME"/"$FILE"
     elif [ -d "$HOME/$FILE" ]; then
-        rm -r $HOME/$FILE
+        rm -r "${HOME:?}"/"$FILE"
     fi
 
     # symlink files
-    ln -s $PWD/$FILE $HOME/$FILE
+    ln -s "$PWD"/"$FILE" "$HOME"/"$FILE"
     echo "$(tput setaf 64)✓$(tput sgr0) Symlink created to $(tput setaf 37)$FILE$(tput sgr0)"
 
 done
 
 # source what we just created
-source $HOME/.profile
+source "$HOME"/.profile