#!/bin/sh
set -e

rev=${1:-HEAD}
revname=$(git describe $rev)

# revname could be 0.7.5 or 0.7.5-NNN-gHASH
# turn that into 0.7.5 or 0.7.5+NNN.gHASH
case "$revname" in
   *-*) revname=$(echo "$revname" | sed -e 's/-/+/' -e 's/-/./')
esac

archive_base="cloud-init-$revname"

# when building an archiving from HEAD, ensure that there aren't any
# uncomitted changes in the working directory (because these would not
# end up in the archive).
if [ "$rev" = HEAD ] && ! git diff-index --quiet HEAD --; then
    if [ -z "$SKIP_UNCOMITTED_CHANGES_CHECK" ]; then
        echo "ERROR: There are uncommitted changes in your working directory." >&2
        exit 1
    else
        echo "WARNING: There are uncommitted changes in your working directory." >&2
        echo "         This changes will not be included in the archive." >&2
    fi
fi

git archive \
    --format=tar.gz \
    --prefix="$archive_base/" "$rev" \
    "--output=$archive_base.tar.gz"

echo "${archive_base}.tar.gz"