go/misc/go_android_exec
Austin Clements 27aa60f540 misc/android: improve exit code workaround
go_android_exec gets the exit status of the process run inside the
Android emulator by sending a small shell script that runs the desired
command and then prints "exitcode=" followed by the exit code. This is
necessary because adb does not reliably pass through the exit status
of the subprocess.

An old bug about this
(https://code.google.com/p/android/issues/detail?id=3254) was closed
in 2016 as fixed in Android N (7.0), but it seems that the adb on the
Android builder at least still sometimes fails to pass through the
exit code.

Unfortunately, this workaround has the effect of injecting
"exitcode=N" into the output of the subprocess it runs, which messes
up tests that are looking for golden output from a subprocess.

Fix this by inserting a filter Writer that looks for the final
"exitcode=N" and strips it from the exec wrapper's own stdout.

For #15919.

This will help us in cleaning up "host tests" for #37486.

Change-Id: I9859f5b215e0ec4a7e33ada04a1857f3cfaf55ae
Reviewed-on: https://go-review.googlesource.com/c/go/+/488975
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
2023-05-03 14:54:58 +00:00
..
exitcode_test.go misc/android: improve exit code workaround 2023-05-03 14:54:58 +00:00
main.go misc/android: improve exit code workaround 2023-05-03 14:54:58 +00:00
README misc/android: rename to misc/go_android_exec, make go build work 2023-05-01 14:45:55 +00:00

Android
=======

For details on developing Go for Android, see the documentation in the
mobile subrepository:

	https://github.com/golang/mobile

To run the standard library tests, enable Cgo and use an appropriate
C compiler from the Android NDK. For example,

	CGO_ENABLED=1 \
	GOOS=android \
	GOARCH=arm64 \
	CC_FOR_TARGET=$NDK/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android21-clang \
	./all.bash

To run tests on the Android device, add the bin directory to PATH so the
go tool can find the go_android_$GOARCH_exec wrapper generated by
make.bash. For example, to run the go1 benchmarks

	export PATH=$GOROOT/bin:$PATH
	cd $GOROOT/test/bench/go1/
	GOOS=android GOARCH=arm64 go test -bench=. -count=N -timeout=T