diff --git a/.gitignore b/.gitignore
index 1b42677..d291895 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 *.iso
+*.tar.gz
 crystal/airootfs/etc/pacman.conf
 crystal/airootfs/etc/buildstamp
 chrooted.sh
diff --git a/build.sh b/build.sh
new file mode 100755
index 0000000..e747e69
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+if [[ "$2" == "" ]]; then
+    WORKDIR=$(mktemp -d)
+else
+    WORKDIR="$2"
+    if [[ ! -d "$WORKDIR" ]]; then
+	mkdir -p "$WORKDIR"
+    fi
+fi
+if [[ "$1" == "--build-iso" ]]; then
+    cp chrooted-iso.sh chrooted.sh
+    MKARCHISO_FLAGS="-v -w $WORKDIR -o . crystal"
+    rm -fv *.iso
+elif [[ "$1" == "--build-bootstrap" ]]; then
+    cp chrooted-bootstrap.sh chrooted.sh
+    MKARCHISO_FLAGS="-m bootstrap -v -w $WORKDIR -o . crystal"
+    rm -fv *.tar.gz
+else
+   RESULTCODE=0
+    if [[ "$1" == "" ]]; then
+	echo "no option given, available options are:"
+	RESULTCODE=1
+    elif [[ "$1" != "--help" ]]; then
+	echo "option '$1' not known, available options are:"
+	RESULTCODE=1
+    fi
+    echo "--build-iso		builds a crystal linux iso"
+    echo "--build-bootstrap	builds a crystal linux rootfs tarball"
+    echo "--help			display this message"
+    exit $RESULTCODE
+fi
+cp crystal/pacman.conf crystal/airootfs/etc/.
+
+echo "Built on $(date +"%D @ %T EST")" > crystal/airootfs/etc/buildstamp
+
+time sudo ./mkarchiso $MKARCHISO_FLAGS
+
+sudo rm -rf $WORKDIR
+if [[ "$1" == "--build-iso" ]]; then
+    sudo chown $USER:$USER *.iso
+else
+    sudo chown $USER:$USER *.tar.gz
+fi
diff --git a/build_iso.sh b/build_iso.sh
deleted file mode 100755
index a976156..0000000
--- a/build_iso.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-
-rm -fv *.iso
-cp crystal/pacman.conf crystal/airootfs/etc/.
-cp chrooted-iso.sh chrooted.sh
-
-if [[ "$1" == "" ]]; then
-    WORKDIR=$(mktemp -d)
-else
-    WORKDIR="$1"
-    if [[ ! -d "$WORKDIR" ]]; then
-        mkdir -p "$WORKDIR"
-    fi
-fi
-
-echo "Built on $(date +"%D @ %T EST")" > crystal/airootfs/etc/buildstamp
-
-time sudo ./mkarchiso -v -w $WORKDIR -o . crystal
-
-sudo rm -rf $WORKDIR
-sudo chown $USER:$USER *.iso
diff --git a/build_rootfs.sh b/build_rootfs.sh
deleted file mode 100755
index be6d0d3..0000000
--- a/build_rootfs.sh
+++ /dev/null
@@ -1,21 +0,0 @@
-#!/usr/bin/env bash
-
-rm -fv *.tar.xz
-cp crystal/pacman.conf crystal/airootfs/etc/.
-cp chrooted-bootstrap.sh chrooted.sh
-
-if [[ "$1" == "" ]]; then
-    WORKDIR=$(mktemp -d)
-else
-    WORKDIR="$1"
-    if [[ ! -d "$WORKDIR" ]]; then
-        mkdir -p "$WORKDIR"
-    fi
-fi
-
-echo "Built on $(date +"%D @ %T EST")" > crystal/airootfs/etc/buildstamp
-
-time sudo ./mkarchiso -m bootstrap -v -w $WORKDIR -o . crystal
-
-sudo rm -rf $WORKDIR
-sudo chown $USER:$USER *.iso