Read in an apt .changes file with a compound Distribution: stanza and create copies for each distribution.

expand_changes_files.bash

expand_changes_files() {
	# This function works around https://github.com/aptly-dev/aptly/issues/757
	# by expanding each changes file into one changes file per Distribution.
	repo=$1
	incoming="$HOME/${repo}/incoming"
	for changes_file in $(ls $incoming/*.changes); do
		changes_basename=$(basename $changes_file)
		distributions="$(grep '^Distribution: ' $changes_file | cut -d':' -f2-)"
		for dist in $distributions; do
			dist_changes_file=$incoming/${dist}_${changes_basename}
			sed -e "s/^Distribution: .*$/Distribution: $dist/" $changes_file > $dist_changes_file
		done
		rm $changes_file
	done
}