Shell script to create a dep-free tar ball (#1368)

scripts/create_tarball.sh

+#!/usr/bin/env bash
+# creates a tar ball of Arbor for e.g. releases
+#
+# checks out repo at a specific branch/commit/tag
+# strips version control,
+# but leaves (empty) .git directories of submodules (CMake checks for it)
+
+set -Eeuo pipefail
+
+if [[ "$#" -ne 3 ]]; then
+    echo "usage: create_tarball.sh path_to_repo branch/commit/tag path_to_output_tarball"
+	exit 1
+fi
+
+trap cleanup SIGINT SIGTERM ERR EXIT
+
+cleanup() {
+  trap - SIGINT SIGTERM ERR EXIT
+  rm -rf "$TMP_DIR"
+}
+
+TMP_DIR=$(mktemp -d)
+
+REPO=$1
+CHECKOUT=$2
+OUT_TARBALL=$3
+
+if [[ ! "$TMP_DIR" || ! -d "$TMP_DIR" ]]; then
+  echo "Could not create temporary directory"
+  exit 1
+fi
+
+REPO_NAME=arbor
+
+cd "$TMP_DIR"
+git clone "$REPO" $REPO_NAME
+cd "$REPO_NAME"
+git checkout "$CHECKOUT"
+git submodule init
+git submodule update
+
+# remove all version control files but not the .git directories themselves
+rm -vrf -- **/.git/*
+
+# remove main .git, only submodule .gits are still present
+rm -vrf .git
+
+# create tar ball
+cd ..
+tar vcfz "$OUT_TARBALL" $REPO_NAME