dist.sh: new script to trivialise create a tarball

dist.sh

+#!/bin/bash
+#
+# Script to build a source distribution for BayesWave
+# based on a git reference (ideally a tag).
+#
+# Author: Duncan Macleod <duncan.macleod@ligo.org>
+#
+
+set -e
+
+# get the TAG from the command-line arguments
+TAG=$1
+shift 1 || {
+  echo "Please include tag to build."; 1>&2
+  echo; 1>&2
+  echo "usage: bash dist.sh {TAG}"; 1>&2
+  exit 1;
+}
+# NOTE: all other arguments are passed to the
+#       CMake configure command
+
+# clone the project into a temporary directory, to ensure a clean copy
+_TMPDIR="$(mktemp -d)"
+trap "rm -rf ${_TMPDIR}" EXIT
+GIT_URL="https://git.ligo.org/lscsoft/bayeswave.git"
+git clone \
+  --quiet \
+  --depth 1 \
+  --branch "${TAG}" \
+  ${GIT_URL} \
+  "${_TMPDIR}" \
+;
+
+# build the tarball in a clean subdirectory
+rm -rf dist
+mkdir -p dist
+cd dist
+cmake \
+  "${_TMPDIR}" \
+  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
+  "$@" \
+;
+cmake \
+  --build . \
+  --target package_source \
+  --verbose \
+;