diff --git a/Dockerfile b/Dockerfile
index ff6243c..4f19fa6 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -10,6 +10,8 @@ ENV KEYSERVER keyserver.ubuntu.com
 
 ENV GNUPGHOME /.gnupg
 
+ENV HOME /tmp
+
 # install aptly
 RUN echo deb http://repo.aptly.info/ squeeze main >> /etc/apt/sources.list
 RUN apt-key adv --keyserver keys.gnupg.net --recv-keys E083A3782A194991
diff --git a/debify.sh b/debify.sh
index 2dfecd2..4436003 100755
--- a/debify.sh
+++ b/debify.sh
@@ -44,18 +44,20 @@ aptly publish repo \
     -passphrase="$passphrase" \
     $APTLY_REPO_NAME
 
-mv ~/.aptly/public /repo
+REPO=${HOME}/repo
+
+mv ~/.aptly/public "$REPO"
 
 if [ ! -z "$KEYSERVER" ] && [ ! -z "$URI" ]
 then
-    release_sig_path=$(find /repo/dists -name Release.gpg | head -1) 
+    release_sig_path=$(find "$REPO/dists" -name Release.gpg | head -1)
     gpg_key_id=$(gpg --list-packets $release_sig_path | grep -oP "(?<=keyid ).+")
 
-    echo "# setup script for $URI" > /repo/go
+    echo "# setup script for $URI" > "$REPO/go"
 
     case "$URI" in
         https://*)
-            cat >> /repo/go <<-END
+            cat >> "$REPO/go" <<-END
 if [ ! -e /usr/lib/apt/methods/https ]
 then
     apt-get update
@@ -64,7 +66,7 @@ fi
 END
     esac
 
-    cat >> /repo/go <<-END
+    cat >> "$REPO/go" <<-END
 apt-key adv --keyserver $KEYSERVER --recv-keys $gpg_key_id
 echo "deb $URI $APTLY_DISTRIBUTION $APTLY_COMPONENT" >> /etc/apt/sources.list
 
@@ -72,4 +74,4 @@ apt-get update
 END
 fi
 
-tar -C /repo -czf /debs/repo.tar.gz .
+tar -C "$REPO" -czf /debs/repo.tar.gz .