Add qemu_multiarch_testing/

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

qemu_multiarch_testing/README

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+How to test build using Aboriginal Linux system images.
+
+* Put a source tree into hdc.dir/.
+For example, this should work:
+git clone git://busybox.net/var/lib/git/busybox.git
+
+* Run ./make-hdc-img.sh: it will generate ext2 image file,
+hdc.img, from hdc.dir/* data. This requires root for loop mount.
+
+* Download and unpack, or build from source and unpack
+one or more system-image-ARCH directories into this directory
+(the one which contains this README).
+
+* Run: ./parallel-build-hdc-img.sh system-image-DIR1 system-image-DIR2...
+(background it if you don't want to see "Waiting to finish" thing).
+This runs build in several qemu virtual machines in parallel.
+
+* Observe system-image-*.log file(s) with growing log of the build.
+
+There is no automated detection of errors for now: you need to examine
+logs yourself.
+
+Log files will also contain uuencoded (or if all else fails, od -tx1'ed)
+binary, if build was successful.
+
+To debug a build problem in one of the sandboxes, change keep_hdb
+to "keep_hdb=true" in parallel-build-hdc-img.sh
+- this preserves system-image-ARCH/hdb.img after the build,
+so you can go into system-image-ARCH and run
+"HDB=hdb.img ./dev-environment.sh" to debug the problem.
+
+You can also run "./parallel-build-hdc-img.sh -s system-image-ARCH"
+- single mode, output is to screen and serial input is from keyboard.
+
+If hdc.dir/bin/busybox-$ARCH exists, it will be used during build
+to supply additional tools.
+
+For me, the following system images worked:
+system-image-armv4l
+system-image-armv4tl
+system-image-armv5l
+    od is buggy on arm*:
+    # echo Hello-hello-hello-hello | od -b
+    0000000 110 145 154 154 157 055 150 145 154 154 157 055 150 145 154 154
+    0000000 157 055 150 145 154 154 157 012
+    0000000
+system-image-i686
+system-image-mips
+system-image-mipsel
+    od is buggy on mips[el]:
+    # echo Hello-hello-hello-hello | od -b
+    0000000 110 145 154 154 157 055 150 145 154 154 157 055 150 145 154 154
+    17767153361 157 055 150 145 154 154 157 012
+    0000000
+system-image-x86_64
+
+And these did not:
+system-image-armv6l  - hang on "Uncompressing Linux... done, booting the kernel"
+system-image-powerpc - hang early in kernel boot
+system-image-sparc   - hang early in userspace
+system-image-m68k    - my qemu doesn't like "-M q800"
+system-image-mips64  - init dies "Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000a"
+system-image-sh4     - qemu segfaults early in kernel boot

qemu_multiarch_testing/extract_od_binary.sh

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+#!/bin/sh
+
+# Converts textual result of "od -tx1 <FILE"
+# back into a binary FILE
+
+grep -a '^[0-7][0-7][0-7][0-7][0-7][0-7][0-7] [0-9a-f][0-9a-f] [0-9a-f][0-9a-f] [0-9a-f][0-9a-f] [0-9a-f][0-9a-f]' | busybox hexdump -R

qemu_multiarch_testing/hdc.dir/build

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+#!/bin/sh
+
+umount /mnt # optional
+
+test -x "bin/busybox-$HOST" && {
+	echo "Found bin/busybox-$HOST, using it"
+	cp -a "bin/busybox-$HOST" bin/busybox
+	bin/busybox --install -s bin/
+	# Supply missing stuff (e.g. bzip2):
+	PATH="$PATH:$PWD/bin"
+	# Override known-buggy host binaries:
+	cp -af bin/od `which od`
+}
+
+(
+	#set -e -x
+	cd busybox
+	make defconfig
+	# Want static build
+	sed 's/^.*CONFIG_STATIC.*$/CONFIG_STATIC=y/' -i .config
+	# Drats, newer Aboriginal Linux has no bzip2
+	bzip2 </dev/null >/dev/null || {
+		sed 's/^.*CONFIG_FEATURE_COMPRESS_USAGE.*$/# CONFIG_FEATURE_COMPRESS_USAGE is not set/' -i .config
+	}
+	# These won't build because of toolchain/libc breakage:
+	sed 's/^.*CONFIG_FEATURE_SYNC_FANCY.*$/# CONFIG_FEATURE_SYNC_FANCY is not set/' -i .config # no syncfs()
+	sed 's/^.*CONFIG_FEATURE_WTMP.*$/# CONFIG_FEATURE_WTMP is not set/' -i .config
+	sed 's/^.*CONFIG_FEATURE_UTMP.*$/# CONFIG_FEATURE_UTMP is not set/' -i .config
+	sed 's/^.*CONFIG_FEATURE_INETD_RPC.*$/# CONFIG_FEATURE_INETD_RPC is not set/' -i .config
+	sed 's/^.*CONFIG_BRCTL.*$/# CONFIG_BRCTL is not set/' -i .config
+	sed 's/^.*CONFIG_IFPLUGD.*$/# CONFIG_IFPLUGD is not set/' -i .config
+	make #V=1 || sh
+	size busybox
+	./busybox || echo "Exit code: $?"
+	if uuencode TEST </dev/null >/dev/null && bzip2 </dev/null >/dev/null; then
+		bzip2 <busybox | uuencode busybox.bz2
+	else
+		od -tx1 <busybox
+	fi
+	#test "x$FTP_PORT" = x ||
+	#	ftpput -P "$FTP_PORT" "$FTP_SERVER" strace
+) 2>&1 | tee build.log
+mount -o remount,ro /home
+sync
+sleep 1

qemu_multiarch_testing/hdc.dir/init

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+#!/bin/sh
+
+# Emit a msg to let user know this place was reached
+echo "Copying to /home"
+# Had a case where cp SEGVs, let's have diagnostics for it
+cp -a /mnt /home || { echo "cp: $?"; exit 1; }
+cd /home/mnt || { echo "cd: $?"; exit 1; }
+exec ./build
+echo "Failed to exec ./build"

qemu_multiarch_testing/make-hdc-img.sh

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+#!/bin/sh -ex
+
+mountpoint -q /
+[ ! -e hdc.img.dir ]
+
+cleanup()
+{
+	trap - EXIT
+	if mountpoint -q hdc.img.dir; then
+		umount -d hdc.img.dir
+	fi
+	mountpoint -q hdc.img.dir ||
+		rm -rf hdc.img.dir
+	exit $@
+}
+
+trap 'cleanup $?' EXIT
+trap 'cleanup 1' HUP PIPE INT QUIT TERM
+
+size=$(du -ks hdc.dir | sed -rn 's/^([0-9]+).*/\1/p')
+[ "$size" -gt 0 ]
+
+rm -f hdc.img
+dd if=/dev/zero of=hdc.img count=1 bs=1024 seek=$(($size*2))
+mkfs.ext3 -q -F -b 1024 -i 4096 hdc.img
+tune2fs -c 0 -i 0 hdc.img
+mkdir hdc.img.dir
+mount -o loop hdc.img hdc.img.dir
+cp -a hdc.dir/* hdc.img.dir/
+umount -d hdc.img.dir

qemu_multiarch_testing/parallel-build-hdc-img.sh

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+#!/bin/sh
+
+export HDBMEGS=100
+keep_hdb=false
+
+build_in_dir()
+{
+	cd "$1" || exit 1
+	rm -f hdb.img
+	nice -n10 time ./native-build.sh ../hdc.img
+	$keep_hdb || rm -f hdb.img
+	echo >&3 "Finished: $1"
+}
+
+test "$1" = "-s" && {
+	dir="$2"
+	# single mode: build one directory, show output
+	test -d "$dir" || exit 1
+	test -e "$dir/native-build.sh" || exit 1
+	build_in_dir "$dir"
+	exit $?
+}
+
+started=false
+for dir; do
+	test -d "$dir" || continue
+	test -e "$dir/native-build.sh" || continue
+	echo "Starting: $dir"
+	build_in_dir "$dir" 3>&1 </dev/null >"$dir.log" 2>&1 &
+	started=true
+done
+
+$started || {
+	echo "Give me system-image-ARCH directories on command line"
+	exit 1
+}
+
+echo "Waiting to finish"
+wait
+echo "Done, check the logs"