Merge pull request #158 from troglobit/wip-tests

Test framework and a small set of basic tests

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

.gitignore

@@ -33,6 +33,9 @@ GTAGS
 /Makefile.in
 /stamp-h1
 
+/test-driver
+/test-suite.log
+
 # TroglOS build system
 /.config
 /.stamp

.travis.yml

@@ -59,3 +59,7 @@ script:
   - size /tmp/sbin/initctl
   - size /tmp/sbin/reboot
   - LD_LIBRARY_PATH=/tmp/lib /tmp/sbin/initctl -h
+  - unshare -V
+  - nsenter -V
+  - chroot --version
+  - 'LD_LIBRARY_PATH=/tmp/lib make distcheck || (cat finit-4.0-beta1/_build/sub/test/test-suite.log; exit 1)'

AUTHORS

@@ -5,6 +5,7 @@ Major Contributors:
  * Tobias Waldekranz <tobias@waldekranz.com>
  * Mattias Walström <mattias.walstrom@westermo.se>
  * Jonas Johansson <jonas.johansson@westermo.se>
+ * Jacques de Laval <jacques@de-laval.se>
 
 Original Author(s):
  * Claudio Matsuoka <cmatsuoka@gmail.com>

Makefile.am

@@ -1,5 +1,5 @@
 ACLOCAL_AMFLAGS    = -I m4
-SUBDIRS            = plugins src
+SUBDIRS            = plugins src test
 doc_DATA           = README.md LICENSE contrib/finit.conf
 EXTRA_DIST         = README.md LICENSE ChangeLog.md contrib/finit.conf
 

configure.ac

@@ -12,7 +12,9 @@ AC_CONFIG_FILES([Makefile
 	contrib/void/Makefile   contrib/void/finit.d/Makefile   contrib/void/finit.d/available/Makefile
 	doc/Makefile
 	plugins/Makefile
-	src/Makefile])
+	src/Makefile
+	test/test.env
+	test/Makefile])
 
 # Older versions of autoconf (<2.58) do not have AC_CONFIG_MACRO_DIR()
 #m4_include([m4/plugin.m4])
@@ -157,12 +159,14 @@ AS_IF([test "x$with_config" != "xno"], [
 		conf=$sysconfdir/finit.conf])])
 AC_EXPAND_DIR(conf_path, "$conf")
 AC_DEFINE_UNQUOTED(FINIT_CONF, "$conf_path", [Main Finit configuration file, default /etc/finit.conf])
+AC_SUBST(FINIT_CONF, "$conf_path")
 
 AS_IF([test "x$with_rcsd" != "xno"], [
 	AS_IF([test "x$rcsd" = "xyes"], [
 		rcsd=$sysconfdir/finit.d])])
 AC_EXPAND_DIR(rcsd_path, "$rcsd")
 AC_DEFINE_UNQUOTED(FINIT_RCSD, "$rcsd_path", [Finit rcS.d/, default /etc/finit.d])
+AC_SUBST(FINIT_RCSD, "$rcsd_path")
 
 AS_IF([test "x$with_rc_local" != "xno"], [
 	AS_IF([test "x$rclocal" = "xyes"], [

test/.gitignore

@@ -0,0 +1,9 @@
+# GNU configure and build system
+*.log
+*.trs
+/Makefile
+/Makefile.in
+
+/test.env
+/checkself.sh
+/tenv-root

test/Makefile.am

@@ -0,0 +1,33 @@
+EXTRA_DIST		 = tenv/lib.sh tenv/exec.sh tenv/start.sh
+EXTRA_DIST		+= tenv/root.mk tenv/busybox-x86_64.md5
+EXTRA_DIST		+= tenv/chrootsetup.sh
+EXTRA_DIST		+= setup-root.sh
+EXTRA_DIST		+= common/service.conf common/service.sh
+EXTRA_DIST		+= checkself.sh
+EXTRA_DIST		+= add-remove-dynamic-service.sh
+EXTRA_DIST		+= add-remove-dynamic-service-sub-config.sh
+EXTRA_DIST		+= start-stop-service.sh
+EXTRA_DIST		+= start-stop-service-sub-config.sh
+
+AM_TESTS_ENVIRONMENT	 = TENV_ROOT='$(abs_builddir)/tenv-root/';
+AM_TESTS_ENVIRONMENT	+= export TENV_ROOT;
+AM_TESTS_ENVIRONMENT	+= export LD_LIBRARY_PATH;
+AM_TESTS_ENVIRONMENT	+= top_builddir=$(top_builddir);
+AM_TESTS_ENVIRONMENT	+= export top_builddir;
+
+checkself.sh:
+	echo '#!/bin/sh' > $@
+	echo shellcheck $(addprefix '"$$srcdir"'/,$(filter %.sh,$(filter-out $@, $(EXTRA_DIST)))) >> $@
+	chmod +x $@
+
+TEST_EXTENSIONS		 = .sh
+TESTS			 = checkself.sh
+TESTS			+= setup-root.sh
+TESTS			+= add-remove-dynamic-service.sh
+TESTS			+= add-remove-dynamic-service-sub-config.sh
+TESTS			+= start-stop-service.sh
+TESTS			+= start-stop-service-sub-config.sh
+
+clean-local:
+	-rm -rf $(builddir)/tenv-root/
+	-rm -f checkself.sh

test/README.md

@@ -0,0 +1,26 @@
+Tests
+=====
+
+Finit comes with a set of tests and a small framework for running them.
+Contributors are encouraged to write new tests when implementing features, or
+fixing bugs.
+
+Each test is run in isolation, in it's own namespace. Finit will therefore
+be able to be launched as PID 1. Since it's also running with it's own root
+directory it will be able to function properly without having any super user
+privileges in the host environment.
+
+Running tests
+-------------
+
+To run the test suite, first [build](../doc/build.md) Finit - then simply run:
+
+    make check
+
+`make check` will set up the required assets for the test environment, and then
+run the full set of tests. The environment is not removed afterwards so at
+this point individual tests can be executed without having to run the entire
+test suite, which is handy when developing new tests or debugging existing
+test. To execute an individual test, simply invoke the script containing it:
+
+    ./test/name-of-the-test.sh

test/add-remove-dynamic-service-sub-config.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/tenv/lib.sh"
+
+test_teardown() {
+    say "Test done $(date)"
+    say "Running test teardown."
+
+    texec rm -f "$FINIT_RCSD/service.conf"
+    texec rm -f /test_assets/service.sh
+}
+
+say "Test start $(date)"
+
+cp "$TEST_DIR"/common/service.sh "$TENV_ROOT"/test_assets/
+
+say "Add a dynamic service in $FINIT_RCSD/service.conf"
+texec sh -c "echo 'service [2345] kill:20 log /test_assets/service.sh' > $FINIT_RCSD/service.conf"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 1 service.sh'
+
+say 'Remove the dynamic service from /etc/finit.d/service.conf'
+texec sh -c "echo > $FINIT_RCSD/service.conf"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 0 service.sh'

test/add-remove-dynamic-service.sh

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/tenv/lib.sh"
+
+test_teardown() {
+    say "Test done $(date)"
+    say "Running test teardown."
+
+    texec rm -f "$FINIT_CONF"
+    texec rm -f /test_assets/service.sh
+}
+
+say "Test start $(date)"
+
+cp "$TEST_DIR"/common/service.sh "$TENV_ROOT"/test_assets/
+
+say "Add a dynamic service in $FINIT_CONF"
+texec sh -c "echo 'service [2345] kill:20 log /test_assets/service.sh' > $FINIT_CONF"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 1 service.sh'
+
+say 'Remove the dynamic service from /etc/finit.conf'
+texec sh -c "echo > $FINIT_CONF"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 0 service.sh'

test/common/service.conf

@@ -0,0 +1 @@
+service [2345] kill:20 log /test_assets/service.sh

test/common/service.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+set -eu
+
+while true; do
+  sleep 5
+done

test/setup-root.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+
+set -eu
+
+# shellcheck disable=SC2154
+make -C "$top_builddir" DESTDIR="$TENV_ROOT" install
+# shellcheck disable=SC2154
+FINITBIN="$(pwd)/$top_builddir/src/finit" DEST="$TENV_ROOT" make -f "$srcdir/tenv/root.mk"

test/start-stop-service-sub-config.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/tenv/lib.sh"
+
+test_teardown() {
+    say "Test done $(date)"
+    say "Running test teardown."
+
+    texec rm -f "$FINIT_RCSD/service.conf"
+    texec rm -f /test_assets/service.sh
+}
+
+say "Test start $(date)"
+
+cp "$TEST_DIR"/common/service.sh "$TENV_ROOT"/test_assets/
+
+say "Add service stanza in $FINIT_RCSD/service.conf"
+texec sh -c "echo 'service [2345] kill:20 log /test_assets/service.sh' > $FINIT_RCSD/service.conf"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 1 service.sh'
+
+say 'Stop the service'
+texec sh -c "initctl stop service.sh"
+
+retry 'assert_num_children 0 service.sh'
+
+say 'Start the service again'
+texec sh -c "initctl start service.sh"
+
+retry 'assert_num_children 1 service.sh'

test/start-stop-service.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+set -eu
+
+TEST_DIR=$(dirname "$0")
+
+# shellcheck source=/dev/null
+. "$TEST_DIR/tenv/lib.sh"
+
+test_teardown() {
+    say "Test done $(date)"
+    say "Running test teardown."
+
+    texec rm -f "$FINIT_CONF"
+    texec rm -f /test_assets/service.sh
+}
+
+say "Test start $(date)"
+
+cp "$TEST_DIR"/common/service.sh "$TENV_ROOT"/test_assets/
+
+say "Add service stanza in $FINIT_CONF"
+texec sh -c "echo 'service [2345] kill:20 log /test_assets/service.sh' > $FINIT_CONF"
+
+say 'Reload Finit'
+texec sh -c "initctl reload"
+
+retry 'assert_num_children 1 service.sh'
+
+say 'Stop the service'
+texec sh -c "initctl stop service.sh"
+
+retry 'assert_num_children 0 service.sh'
+
+say 'Start the service again'
+texec sh -c "initctl start service.sh"
+
+retry 'assert_num_children 1 service.sh'

test/tenv/busybox-x86_64.md5

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

test/tenv/chrootsetup.sh

@@ -0,0 +1,49 @@
+#!/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
+
+# 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
+
+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/tenv/enter.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -eu
+
+cmd=""
+if [ "$#" -lt 1 ]; then
+    cmd="/bin/sh"
+else
+    cmd=$1
+    shift
+fi
+
+TEST_DIR=$(dirname "$0")/..
+TENV_ROOT="${TENV_ROOT:-$(pwd)/${TEST_DIR}/tenv-root}"
+PID_FILE="$TENV_ROOT/running_test.pid"
+
+if [ -f  "$PID_FILE" ] ; then
+    target=$(cat "$PID_FILE")
+    target=$(pgrep -P "$target")
+else
+    echo "No test running!"
+    exit 1
+fi
+
+source "$TEST_DIR/test.env"
+
+"$(dirname "$0")"/exec.sh "$target" "$cmd" "$@"

test/tenv/exec.sh

@@ -0,0 +1,57 @@
+#!/bin/sh
+# Execute a given command from withing the test environment.
+#
+# 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
+
+if [ "$#" -lt 2 ]; then
+    echo "Usage:"
+    echo "  $0 [target-pid] [command [arguments]]"
+    exit 1
+fi
+target="$1"
+shift
+
+TEST_DIR=$(dirname "$0"../)
+TENV_ROOT="${TENV_ROOT:-$(pwd)/${TEST_DIR}/tenv-root}"
+
+nsenter=$(command -v nsenter)
+chroot=$(command -v chroot)
+
+export PS1='\w \$ '
+export PS2='> '
+export PS3='#? '
+export PS4='+ '
+
+PATH="$TESTENV_PATH"
+export PATH
+
+"$nsenter" \
+    --preserve-credentials \
+    --user \
+    --mount \
+    --uts \
+    --ipc \
+    --net \
+    --pid \
+    -w -t "$target" \
+    "$chroot" "$TENV_ROOT" "$@"

test/tenv/lib.sh

@@ -0,0 +1,144 @@
+#!/bin/sh
+# Small framework for executing tests in a test environment.
+#
+# 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.
+
+assert_num_children() {
+    assert "$1 services are running" "$(texec pgrep -P 1 "$2" | wc -l)" -eq "$1"
+}
+
+texec() {
+    # shellcheck disable=SC2154
+    "$TEST_DIR/tenv/exec.sh" "$finit_pid" "$@"
+}
+
+pause() {
+    echo "Press any key to continue... "
+    read -r REPLY
+}
+
+toggle_finit_debug() {
+    say 'Toggle finit debug'
+    texec initctl debug
+    sleep 0.5
+}
+
+color_reset='\e[0m'
+fg_red='\e[1;31m'
+fg_green='\e[1;32m'
+fg_yellow='\e[1;33m'
+log() {
+    printf "< %s > %b%b%b %s\n" "$0" "$1" "$2" "$color_reset" "$3"
+}
+
+assert() {
+    __assert_msg=$1
+    shift
+    if [ ! "$@" ]; then
+        log "$fg_red" ✘ "$__assert_msg ($*)"
+        return 1
+    fi
+    log "$fg_green" ✔ "$__assert_msg"
+}
+
+retry() {
+    __retry_cmd=$1
+    shift
+    case "$#" in
+        2)
+            __retry_n=$1
+            __retry_sleep=$2
+            ;;
+        1)
+            __retry_n=$1
+            __retry_sleep=0.1
+            ;;
+        *)
+            __retry_n=50
+            __retry_sleep=0.1
+            ;;
+    esac
+
+    for _ in $(seq 1 "$__retry_n"); do
+        sleep "$__retry_sleep"
+        __retry_cmd_out=$(eval "$__retry_cmd") && \
+            echo "$__retry_cmd_out" && \
+            return 0
+    done
+    __retry_cmd_exit="$?"
+    echo "$__retry_cmd_out"
+    return "$__retry_cmd_exit"
+}
+
+say() {
+    log "$fg_yellow" • "$@"
+}
+
+teardown() {
+    test_status="$?"
+
+    if type test_teardown > /dev/null 2>&1 ; then
+	test_teardown
+    fi
+
+    log "$color_reset" '--' ''
+    if [ "$test_status" -eq 0 ]; then
+        log "$fg_green" 'TEST PASS' ''
+    else
+        log "$fg_red" 'TEST FAIL' ''
+    fi
+    if [ -n "${finit_pid+x}" ]; then
+        texec kill -SIGUSR2 1
+    fi
+
+    wait
+
+    if [ -d "$TENV_ROOT/var/lock" ]; then
+        chmod +r "$TENV_ROOT/var/lock"
+    fi
+    rm -f "$TENV_ROOT"/running_test.pid
+}
+
+trap teardown EXIT
+
+TENV_ROOT="${TENV_ROOT:-$(pwd)/${TEST_DIR}/tenv-root}"
+export TENV_ROOT
+
+# shellcheck source=/dev/null
+. "$TENV_ROOT/../test.env"
+
+# Setup test environment
+if [ -n "${DEBUG:-}" ]; then
+    FINIT_ARGS="${FINIT_ARGS:-} finit.debug=on"
+fi
+# shellcheck disable=2086
+"$TEST_DIR/tenv/start.sh" finit ${FINIT_ARGS:-} &
+finit_ppid=$!
+echo "$finit_ppid" > "$TENV_ROOT"/running_test.pid
+
+>&2 echo "Hint: Execute 'TENV_ROOT=$TENV_ROOT $TEST_DIR/tenv/enter.sh' to enter the test namespace"
+log "$color_reset" 'Setup of test environment done' ''
+
+finit_pid=$(retry "pgrep -P $finit_ppid")
+
+tty=/dev/$(texec cat /sys/class/tty/console/active)
+texec cat "$tty" &
+sleep 1

test/tenv/root.mk

@@ -0,0 +1,91 @@
+# Root file system for test environment.
+#
+# 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.
+
+DEST		?= ../tenv-root
+srcdir		?= ../
+
+ARCH		?= x86_64
+
+FINITBIN   ?= ./sbin/finit
+
+BBVER ?= 1.31.0
+BBBIN  = busybox-$(ARCH)
+BBURL ?= https://www.busybox.net/downloads/binaries/$(BBVER)-defconfig-multiarch-musl/$(BBBIN)
+
+binaries = $(DEST)/bin/cat \
+	$(DEST)/bin/cp \
+	$(DEST)/bin/date \
+	$(DEST)/bin/echo \
+	$(DEST)/bin/env \
+	$(DEST)/bin/find \
+	$(DEST)/bin/kill \
+	$(DEST)/bin/ls \
+	$(DEST)/bin/mkdir \
+	$(DEST)/bin/mkfifo \
+	$(DEST)/bin/mknod \
+	$(DEST)/bin/mount \
+	$(DEST)/bin/printf \
+	$(DEST)/bin/pgrep \
+	$(DEST)/bin/ps \
+	$(DEST)/bin/rm \
+	$(DEST)/bin/sh \
+	$(DEST)/bin/sleep \
+	$(DEST)/bin/top \
+	$(DEST)/bin/touch
+
+dirs = $(DEST)/bin \
+	$(DEST)/dev \
+	$(DEST)/etc \
+	$(DEST)/proc \
+	$(DEST)/sbin \
+	$(DEST)/sys \
+	$(DEST)/test_assets \
+	$(DEST)/tmp
+
+_libs_src = $(shell ldd $(FINITBIN) | grep -Eo '/[^ ]+')
+libs = $(foreach path,$(_libs_src),$(abspath $(DEST))$(path))
+
+all: $(dirs) $(binaries) $(libs) $(DEST)/bin/chrootsetup.sh
+
+$(dirs):
+	mkdir -p $@
+
+$(DEST)/bin/$(BBBIN).md5:
+	cp $(srcdir)/tenv/$(notdir $@) $@
+
+$(DEST)/bin/$(BBBIN): $(DEST)/bin/$(BBBIN).md5
+	wget -O $@ $(BBURL)
+	chmod +x $@
+	cd $(dir $@); \
+	  md5sum -c $(BBBIN).md5
+
+$(DEST)/bin/chrootsetup.sh:
+	cp $(srcdir)/tenv/$(notdir $@) $@
+
+$(binaries): $(DEST)/bin/$(BBBIN)
+	cd $(DEST)/bin; \
+	  rm -f $(notdir $@); \
+	  ln -s $(BBBIN) $(notdir $@)
+
+$(libs):
+	mkdir -p $(dir $@)
+	cp $(patsubst $(abspath $(DEST))%,%,$@) $@

test/tenv/start.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+# Start a new test environment.
+#
+# 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
+
+TEST_DIR=$(dirname "$0"../)
+TENV_ROOT="${TENV_ROOT:-$(pwd)/${TEST_DIR}/tenv-root}"
+
+unshare=$(command -v unshare)
+chroot=$(command -v chroot)
+
+export PS1='\w \$ '
+export PS2='> '
+export PS3='#? '
+export PS4='+ '
+
+PATH="$TESTENV_PATH"
+export PATH
+
+# Not supported by Busybox unshare:
+#  --cgroup --time
+exec "$unshare" \
+    --user --map-root-user \
+    --fork --pid --mount-proc \
+    --mount \
+    --mount-proc \
+    --uts --ipc --net \
+    "$chroot" "$TENV_ROOT" /bin/chrootsetup.sh "$@"

test/test.env.in

@@ -0,0 +1,6 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+
+export TESTENV_PATH=/bin:/sbin:"@bindir@":"@sbindir@"
+export FINIT_CONF="@FINIT_CONF@"
+export FINIT_RCSD="@FINIT_RCSD@"