build/confirm: simple but effective confirmation dialog

Makefile

@@ -23,10 +23,10 @@
 # OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 # SUCH DAMAGE.
 
-STEPS=		arm base boot chroot clean compress core distfiles download \
+STEPS=		arm base boot chroot clean compress confirm core distfiles \
-		dvd info kernel nano plugins ports prefetch print rebase \
+		download dvd info kernel nano plugins ports prefetch print \
-		release rename serial sign skim test update upload verify \
+		rebase release rename serial sign skim test update upload \
-		vga vm xtools
+		verify vga vm xtools
 SCRIPTS=	batch nightly refresh pkg_fingerprint pkg_sign
 .PHONY:		${STEPS}
 

README.md

@@ -416,6 +416,11 @@ specify the remote end, e.g. SERVER=user@does.not.exist
 Additionally, UPLOADDIR can be used to specify a remote location.  At
 this point only "logs" upload cleares and creates directories on the fly.
 
+If you want to script interactive prompts you may use the confirm target
+to operate yes or no questions before an action:
+
+    # make info confirm dvd
+
 Last but not least, a refresh of OPNsense core and plugins on package
 sets is invoked using:
 

build/common.sh

@@ -241,13 +241,17 @@ export PRODUCT_CORE="${PRODUCT_TYPE}${PRODUCT_SUFFIX}"
 export PRODUCT_PLUGINS="os-*"
 export PRODUCT_PLUGIN="os-*${PRODUCT_SUFFIX}"
 
-if [ "${SELF}" != print -a "${SELF}" != info ]; then
+case "${SELF}" in
+confirm|info|print)
+	;;
+*)
 	if [ -z "${PRINT_ENV_SKIP}" ]; then
 		export PRINT_ENV_SKIP=1
 		env | sort
 	fi
 	echo ">>> Running build step: ${SELF}"
-fi
+	;;
+esac
 
 git_reset()
 {

build/confirm.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+# Copyright (c) 2018 Franco Fichtner <franco@opnsense.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+set -e
+
+SELF=confirm
+
+. ./common.sh
+
+read -p "Proceed with this action? [y/N]: " YN
+
+case ${YN} in
+[yY])
+	;;
+*)
+	exit 1
+	;;
+esac