Merge 'ci: Atomically deploy updates'

See merge request !47

.gitlab-ci.yml

@@ -59,7 +59,7 @@ deploy:
   tags:
     - local
   script:
-    - "cp -r www/dist/* /var/www/game"
+    - ./ci/deploy.sh www/dist /var/www
   only:
     - master
     - tags

ci/deploy.sh

+#!/bin/bash
+set -e
+
+INDIR="$1"
+OUTDIR="$2"
+
+if ! test -h "$OUTDIR/game" && test -d "$OUTDIR/game"; then
+    echo "Removing legacy deployment directory ..."
+    rm -r "$OUTDIR/game"
+fi
+
+if ! test -d "$OUTDIR/versions"; then
+    echo "Creating versions directory ..."
+    mkdir "$OUTDIR/versions"
+fi
+
+VERSION="$(git -C "$INDIR" describe --always --long)"
+
+echo "Copying to $OUTDIR/versions/$VERSION ..."
+cp -rT "$INDIR" "$OUTDIR/versions/$VERSION"
+
+echo "Atomically updating symlink ..."
+ln -nsf "$OUTDIR/versions/$VERSION" "$OUTDIR/new-game"
+mv -T "$OUTDIR/new-game" "$OUTDIR/game"
+
+echo "WE ARE LIVE!"
+
+echo "Cleaning up previous deployments ..."
+for PREVIOUS in "$OUTDIR/versions"/*; do
+    if ! [ "$PREVIOUS" = "$OUTDIR/versions/$VERSION" ]; then
+        echo " - Removing $PREVIOUS ..."
+        rm -r "$PREVIOUS"
+    fi
+done