Better error handling.

build.sh

@@ -1,29 +1,37 @@
 #!/bin/bash
+build() {
+    cd aleta
+    git fetch
+    current_commit=$(git rev-parse HEAD)
+    if [ $current_commit  == `git rev-parse @{u}` ]; then
+        echo 'Aleta is updated'
+        cd -
+        return 1
+    fi
+    git pull
+    cd -  
+    if [ -e output ]; then
+        rm -rf output
+    fi
+    mkdir output
+    sudo docker build --no-cache -t aletareleaser:latest .
+    sudo docker run -v $(realpath output):/var/lib/aleta/output --rm aletareleaser
+}
 
 source ~/.bashrc
 cd $(dirname $0)
 if [ -f aleta.lock ]; then
     echo 'Deploy is running.';
+    exit 0;
 fi
 touch aleta.lock
-pushd aleta
-git fetch
-current_commit=$(git rev-parse HEAD)
-if [ $current_commit  == `git rev-parse @{u}` ]; then
-    echo 'Aleta is updated'
-    exit 0
-fi
-git pull
-popd
-if [ -e output ]; then
-    rm -rf output
-fi
-mkdir output
-sudo docker build --no-cache -t aletareleaser:latest .
-sudo docker run -v $(realpath output):/var/lib/aleta/output --rm -it aletareleaser
-if [ ! -e output/aleta.tar.gz ]; then
+build
+exit_build=$?
+rm aleta.lock
+if [ $exit_build == 0 ]; then
+    if [ ! -e output/aleta.tar.gz ]; then
         echo "aleta.tar.gz not exists." 1>&2
         exit 1
+    fi
+    perl create_aleta_release.pl
 fi
-rm aleta.lock
-perl create_aleta_release.pl