tools: Add a script to switch between coreutils and rust-coreutils

These being essential packages, a script is needed to backup binaries
used to do the upgrade.

Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>

debian/changelog

+apertis-dev-tools (0.2021.8) apertis; urgency=medium
+
+  * Add a script to switch between coreutils and rust-coreutils
+
+ -- Detlev Casanova <detlev.casanova@collabora.com>  Mon, 21 Feb 2022 14:09:42 -0500
+
 apertis-dev-tools (0.2021.7) apertis; urgency=medium
 
   * pkg-merge-updatesi: Try to fast-forward before rebasing

tools/Makefile

@@ -8,6 +8,7 @@ TOOLS = \
 	devroot-enter \
 	apertis-pkg-merge-updates \
 	apertis-pkg-pull-updates \
+	apertis-switch-coreutils-rust \
 	import-debian-package
 
 all:

tools/apertis-switch-coreutils-rust

+#!/bin/sh
+
+# This script is used to switch from rust-coreutils to coreutils (and vice-versa)
+# without breaking the system.
+
+set -e
+
+case "$1" in
+	coreutils|rust-coreutils)
+		PACKAGE="${1}"
+		;;
+	*)
+		echo "A valid coreutils provider must be given on the command line"
+		echo "Usage: $0 [coreutils|rust-coreutils]"
+		exit 1
+		;;
+esac
+
+# Copy needed binary to /usr/local/bin
+cp /bin/rm /usr/local/bin
+DPKGPATH=/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
+
+# Install the new package
+apt-get -y -o Dpkg::Path="$DPKGPATH" --allow-remove-essential install ${PACKAGE}
+
+# Cleanup
+rm /usr/local/bin/rm
+