format code with perltidy

.perltidyrc

@@ -0,0 +1,15 @@
+# mmdebstrap is a tool focused on Debian and derivatives (it relies on apt
+# after all). Thus, we use a perl style used in other Debian Perl code. The
+# following options are used in Lintian and devscripts
+
+--break-before-all-operators
+--noblanks-before-comments
+--cuddled-else
+--maximum-line-length=79
+--paren-tightness=2
+--square-bracket-tightness=2
+--space-for-semicolon
+--opening-brace-always-on-right
+--stack-opening-tokens
+--stack-closing-tokens
+--format-skipping

coverage.sh

@@ -2,6 +2,16 @@
 
 set -eu
 
+perltidy < mmdebstrap > mmdebstrap.tdy
+ret=0
+diff -u mmdebstrap mmdebstrap.tdy || ret=$?
+if [ "$ret" -ne 0 ]; then
+	echo "perltidy failed" >&2
+	rm mmdebstrap.tdy
+	exit 1
+fi
+rm mmdebstrap.tdy
+
 mirrordir="./shared/cache/debian"
 
 if [ ! -e "$mirrordir" ]; then