test: refactor test framework to use a rootfs skeleton

Instead of having to create files, and copying them in place for each
test, we move all static test files to a skeleton rootfs.  This makes
it a lot easier to get an overview of how things and how they work.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/skel/bin/busybox-x86_64.md5

@@ -0,0 +1 @@
+ea7e2353af0067a926d3e021e504290e  busybox-x86_64

test/skel/bin/slay

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+#!/bin/sh
+
+nm=$1
+
+# shellcheck disable=SC2046
+getpid()
+{
+	initctl status "$1" |awk '/PID :/{ print $3; }'
+}
+
+pid=$(getpid "$nm")
+if [ -f oldpid ]; then
+	oldpid=$(cat oldpid)
+	if [ "$oldpid" = "$pid" ]; then
+		echo "Looks bad, wait for it ..."
+		sleep 3
+		pid=$(getpid "$nm")
+		if [ "$oldpid" = "$pid" ]; then
+			echo "Finit did not deregister old PID $oldpid vs $pid"
+			initctl status "$nm"
+			ps
+			echo "Reloading finit ..."
+			initctl reload
+			sleep 1
+			initctl status "$nm"
+			exit 1
+		fi
+	fi
+fi
+
+if [ "$pid" -le 1 ]; then
+	sleep 3
+	pid=$(getpid "$nm")
+	if [ "$pid" -le 1 ]; then
+		echo "Got a bad PID: $pid, aborting ..."
+		ps
+		sleep 1
+		initctl status "$nm"
+		ps
+		exit 1
+	fi
+fi
+
+echo "$pid" > oldpid
+
+#echo "PID $pid, kill -9 ..."
+kill -9 "$pid"

test/skel/etc/hostname

@@ -0,0 +1 @@
+test

test/skel/etc/init.d/S01-service.sh

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+#!/bin/sh
+# SysV style start script for service.sh
+
+DAEMON="/sbin/service.sh"
+PIDFILE="/var/run/service.pid"
+
+start()
+{
+	printf 'Starting %s: ' "$DAEMON"
+	start-stop-daemon -S -b -q -p "$PIDFILE" -x "$DAEMON"
+
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+
+	return "$status"
+}
+
+stop()
+{
+	printf 'Stopping %s: ' "$DAEMON"
+	start-stop-daemon -K -q -p "$PIDFILE"
+
+	status=$?
+	if [ "$status" -eq 0 ]; then
+		echo "OK"
+	else
+		echo "FAIL"
+	fi
+
+	return "$status"
+}
+
+restart()
+{
+	stop
+	sleep 1
+	start
+}
+
+case "$1" in
+	start|stop|restart)
+		"$1"
+		;;
+	*)
+		echo "Usage: $0 {start|stop|restart}, got $0 $1"
+		exit 1
+esac

test/skel/etc/init.d/rcK

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+echo "Shutting down ..."
+exit 0

test/skel/etc/init.d/rcS

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+echo "Starting up ..."
+poweroff -d 2
+

test/skel/etc/inittab

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+# /etc/inittab
+#
+# Copyright (C) 2001 Erik Andersen <andersen@codepoet.org>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
+# Format for each entry: <id>:<runlevels>:<action>:<process>
+#
+# id        == tty to run on, or empty for /dev/console
+# runlevels == ignored
+# action    == one of sysinit, respawn, askfirst, wait, and once
+# process   == program to run
+
+# Startup the system
+#::sysinit:/bin/mount -t proc proc /proc
+#::sysinit:/bin/mount -o remount,rw /
+#::sysinit:/bin/mkdir -p /dev/pts /dev/shm
+#::sysinit:/bin/mount -a
+#::sysinit:/bin/mkdir -p /run/lock/subsys
+#::sysinit:/sbin/swapon -a
+null::sysinit:/bin/ln -sf /proc/self/fd /dev/fd
+null::sysinit:/bin/ln -sf /proc/self/fd/0 /dev/stdin
+null::sysinit:/bin/ln -sf /proc/self/fd/1 /dev/stdout
+null::sysinit:/bin/ln -sf /proc/self/fd/2 /dev/stderr
+::sysinit:/bin/hostname -F /etc/hostname
+# now run any rc scripts
+::sysinit:/etc/init.d/rcS
+
+# Put a getty on the serial port
+#ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100 # GENERIC_SERIAL
+
+# Stuff to do for the 3-finger salute
+#::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+::shutdown:/etc/init.d/rcK
+#::shutdown:/sbin/swapoff -a
+#::shutdown:/bin/umount -a -r

test/skel/sbin/chrootsetup.sh

@@ -0,0 +1,52 @@
+#!/bin/sh
+# Setup the things (mount /proc, /tmp, etc.) that needs to be set up from
+# within the namespace/chroot and then start PID 1.
+#
+# Copyright (c) 2021  Jacques de Laval <jacques@de-laval.se>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+set -eu
+export PATH=$PATH:/usr/bin:/usr/sbin
+
+# It would have been nice to mount /dev as devtmpfs, but unfortunately
+# that's not possible if you're not privileged. For now tmpfs will
+# have to do.
+mount -n -t tmpfs none /dev
+# Silence BusyBox init
+touch /dev/null
+
+mount -t proc none /proc
+mount -t sysfs none /sys
+
+if [ "$(ls -A /tmp)" ]; then
+	mkdir -p /tmp.shadow
+	mount --bind /tmp /tmp.shadow
+	mount -t tmpfs none /tmp
+	cp -a /tmp.shadow/* /tmp/
+else
+	mount -t tmpfs none /tmp
+fi
+
+mkdir -p "$FINIT_RCSD"
+
+tty=/dev/$(cat /sys/class/tty/console/active)
+mkfifo "$tty"
+
+exec "$@"

test/skel/sbin/service.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+
+cleanup()
+{
+	echo "Got signal, stopping ..."
+	rm -f /run/service.pid
+	exit 0
+}
+
+# Hook SIGUSR1 and dump trace to file system
+# shellcheck disable=SC2172
+trap 'echo USR1 > /tmp/usr1.log' USR1
+trap cleanup INT
+trap cleanup TERM
+trap cleanup QUIT
+trap cleanup EXIT
+
+echo $$ > /run/service.pid
+
+# sleep may exit on known signal, so
+# we cannot use 'set -e'
+while true; do
+	sleep 1
+done

test/skel/var/run

@@ -0,0 +1 @@
+../run