From 4f82cb826192cbbf34d1f85c73df6ac79659fb5d Mon Sep 17 00:00:00 2001
From: Jacques de Laval <jacques@de-laval.se>
Date: Thu, 18 Feb 2021 00:47:55 +0100
Subject: [PATCH] WIP: test makefile

---
 test/.gitignore         |  2 ++
 test/Makefile           | 70 +++++++++++++++++++++++++++++++++++++++++
 test/busybox-x86_64.md5 |  1 +
 test/run.sh             | 14 ++++++---
 test/testenter.sh       | 26 +++++++++++++++
 test/testwrapper.sh     | 22 +++++++++++--
 6 files changed, 128 insertions(+), 7 deletions(-)
 create mode 100644 test/.gitignore
 create mode 100644 test/Makefile
 create mode 100644 test/busybox-x86_64.md5
 create mode 100755 test/testenter.sh

diff --git a/test/.gitignore b/test/.gitignore
new file mode 100644
index 00000000..af5859fd
--- /dev/null
+++ b/test/.gitignore
@@ -0,0 +1,2 @@
+busybox-x86_64
+test_root
diff --git a/test/Makefile b/test/Makefile
new file mode 100644
index 00000000..206ffb93
--- /dev/null
+++ b/test/Makefile
@@ -0,0 +1,70 @@
+ARCH ?= x86_64
+
+busybox-ver = 1.31.0
+busybox-bin = busybox-$(ARCH)
+
+testroot = test_root
+testroot_bin = $(testroot)/bin
+binaries = $(testroot_bin)/cat \
+           $(testroot_bin)/date \
+           $(testroot_bin)/echo \
+           $(testroot_bin)/ls \
+           $(testroot_bin)/mkdir \
+           $(testroot_bin)/mkfifo \
+           $(testroot_bin)/mknod \
+           $(testroot_bin)/mount \
+           $(testroot_bin)/printf \
+           $(testroot_bin)/ps \
+           $(testroot_bin)/sh \
+           $(testroot_bin)/sleep \
+           $(testroot_bin)/top \
+           $(testroot_bin)/touch
+dirs = $(testroot)/dev \
+              $(testroot)/lib \
+              $(testroot)/proc \
+              $(testroot)/sbin \
+              $(testroot)/sys \
+              $(testroot)/tmp \
+              $(testroot)/usr/local/lib
+
+$(testroot)/%: $(testroot)
+	mkdir -p $@
+
+$(busybox-bin):
+	wget 'https://www.busybox.net/downloads/binaries/$(busybox-ver)-defconfig-multiarch-musl/$(busybox-bin)'
+	md5sum -c $(busybox-bin).md5
+
+$(testroot):
+	mkdir $(testroot)
+
+$(testroot_bin)/$(busybox-bin): $(testroot_bin) $(busybox-bin)
+	cp $(busybox-bin) $(testroot_bin)/
+	chmod +x $(testroot_bin)/$(busybox-bin)
+
+$(testroot_bin)/%: $(testroot_bin)/$(busybox-bin)
+	cd $(testroot_bin); \
+	  ln -s $(busybox-bin) $(notdir $@)
+
+$(testroot_bin)/testwrapper.sh:
+	cp testwrapper.sh $@
+
+$(testroot)/sbin/finit: ../src/finit $(testroot)/lib/ld-musl-x86_64.so.1 $(testroot)/usr/local/lib/libite.so.5 $(testroot)/usr/local/lib/libuev.so.2
+	cp $< $@
+
+$(testroot)/lib/ld-musl-x86_64.so.1:
+	cp test_root.backup/lib/ld-musl-x86_64.so.1 $@
+
+$(testroot)/usr/local/lib/libite.so.5:
+	cp test_root.backup/usr/local/lib/libite.so.5 $@
+
+$(testroot)/usr/local/lib/libuev.so.2:
+	cp test_root.backup/usr/local/lib/libuev.so.2 $@
+
+.PHONY: test
+test: $(binaries) $(testroot_bin)/testwrapper.sh $(dirs) $(testroot)/sbin/finit
+	./run.sh finit
+
+.PHONY: clean
+clean:
+	rm -rf $(testroot)
+	rm -f $(busybox-bin)
diff --git a/test/busybox-x86_64.md5 b/test/busybox-x86_64.md5
new file mode 100644
index 00000000..0ecfec84
--- /dev/null
+++ b/test/busybox-x86_64.md5
@@ -0,0 +1 @@
+ea7e2353af0067a926d3e021e504290e  busybox-x86_64
diff --git a/test/run.sh b/test/run.sh
index 399bdb8b..fff9e83e 100755
--- a/test/run.sh
+++ b/test/run.sh
@@ -1,15 +1,19 @@
 #!/bin/sh
 
-set -eux
+set -eu
 
 TEST_DIR=$(dirname "$0")
-TESTS_ROOT="${TEST_DIR}/test_root"
+TESTS_ROOT="$(pwd)/${TEST_DIR}/test_root"
 
-cp "${TEST_DIR}/testwrapper.sh" "${TESTS_ROOT}/usr/local/bin/"
+echo "Hint: Execute './test/testenter.sh \$(pgrep -P $$) /bin/sh; reset' to enter the test namespace"
 
-unshare \
+# Not supported by Busybox unshare:
+#  --cgroup --time
+export PATH=/sbin:/bin
+exec unshare \
     --user --map-root-user \
     --fork --pid --mount-proc \
     --mount \
     --mount-proc \
-    chroot "$TESTS_ROOT" /usr/local/bin/testwrapper.sh "$@"
+    --uts --ipc --net \
+    chroot "$TESTS_ROOT" /bin/testwrapper.sh "$@"
diff --git a/test/testenter.sh b/test/testenter.sh
new file mode 100755
index 00000000..8c4b11bb
--- /dev/null
+++ b/test/testenter.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -eu
+
+if [ "$#" -lt 2 ]; then
+    echo "Usage:"
+    echo "  $0 [target-pid] [command [arguments]]"
+    exit 1
+fi
+target="$1"
+shift
+
+TEST_DIR=$(dirname "$0")
+TESTS_ROOT="$(pwd)/${TEST_DIR}/test_root"
+
+export PATH=/sbin:/bin
+nsenter \
+    --preserve-credentials \
+    --user \
+    --mount \
+    --uts \
+    --ipc \
+    --net \
+    --pid \
+    -w -t "$target" \
+    chroot "$TESTS_ROOT" "$@"
diff --git a/test/testwrapper.sh b/test/testwrapper.sh
index ec4be152..19a9afee 100755
--- a/test/testwrapper.sh
+++ b/test/testwrapper.sh
@@ -1,9 +1,27 @@
 #!/bin/sh
 
-set -eux
+set -eu
 
-export PATH=/sbin:/bin
+mount -n -t tmpfs none /dev
+# mount -t devtmpfs none /dev
+
+# mknod -m 622 /dev/console c 5 1
+# mknod -m 666 /dev/null c 1 3
+# mknod -m 666 /dev/zero c 1 5
+# mknod -m 666 /dev/ptmx c 5 2
+# mknod -m 666 /dev/tty c 5 0
+# mknod -m 444 /dev/random c 1 8
+# mknod -m 444 /dev/urandom c 1 9
+# chown root:tty /dev/{console,ptmx,tty}
 
 mount -t proc none /proc
+mount -t sysfs none /sys
+mount -t tmpfs none /tmp
+
+# mkdir -p /dev/pts
+# mount -t devpts none /dev/pts
+
+tty=/dev/$(cat /sys/class/tty/console/active)
+mkfifo "$tty"
 
 exec "$@"