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go/misc/cgo/testplugin/test.bash
Russ Cox bd95f889cd cmd/go: cache successful test results 
This CL adds caching of successful test results, keyed by the
action ID of the test binary and its command line arguments.

Suppose you run:

	go test -short std
	<edit a typo in a comment in math/big/float.go>
	go test -short std

Before this CL, the second go test would re-run all the tests
for the std packages. Now, the second go test will use the cached
result immediately (without any compile or link steps) for any
packages that do not transitively import math/big, and then
it will, after compiling math/big and seeing that the .a file didn't
change, reuse the cached test results for the remaining packages
without any additional compile or link steps.

Suppose that instead of editing a typo you made a substantive
change to one function, but you left the others (including their
line numbers) unchanged. Then the second go test will re-link
any of the tests that transitively depend on math/big, but it still
will not re-run the tests, because the link will result in the same
test binary as the first run.

The only cacheable test arguments are:

	-cpu
	-list
	-parallel
	-run
	-short
	-v

Using any other test flag disables the cache for that run.
The suggested argument to mean "turn off the cache" is -count=1
(asking "please run this 1 time, not 0").

There's an open question about re-running tests when inputs
like environment variables and input files change. For now we
will assume that users will bypass the test cache when they
need to do so, using -count=1 or "go test" with no arguments.

This CL documents the new cache but also documents the
previously-undocumented distinction between "go test" with
no arguments (now called "local directory mode") and with
arguments (now called "package list mode"). It also cleans up
a minor detail of package list mode buffering that used to change
whether test binary stderr was sent to go command stderr based
on details like exactly how many packages were listed or
how many CPUs the host system had. Clearly the file descriptor
receiving output should not depend on those, so package list mode
now consistently merges all output to stdout, where before it
mostly did that but not always.

Fixes #11193.

Change-Id: I120edef347b9ddd5b10e247bfd5bd768db9c2182
Reviewed-on: https://go-review.googlesource.com/75631
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Crawshaw <crawshaw@golang.org>
2017-11-03 22:07:55 +00:00

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#!/usr/bin/env bash
# Copyright 2016 The Go Authors. All rights reserved.
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file.
set -e
if [ ! -f src/host/host.go ]; then
cwd=$(pwd)
echo "misc/cgo/testplugin/test.bash is running in $cwd" 1>&2
exit 1
fi
goos=$(go env GOOS)
goarch=$(go env GOARCH)
echo SKIP: golang.org/issue/22571.
exit 0
function cleanup() {
rm -f plugin*.so unnamed*.so iface*.so issue*
rm -rf host pkg sub iface
}
trap cleanup EXIT
rm -rf pkg sub
mkdir sub
GOPATH=$(pwd) go build -i -gcflags "$GO_GCFLAGS" -buildmode=plugin plugin1
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin plugin2
cp plugin2.so plugin2-dup.so
GOPATH=$(pwd)/altpath go build -gcflags "$GO_GCFLAGS" -buildmode=plugin plugin-mismatch
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o=sub/plugin1.so sub/plugin1
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o=unnamed1.so unnamed1/main.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o=unnamed2.so unnamed2/main.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" host
LD_LIBRARY_PATH=$(pwd) ./host
# Test that types and itabs get properly uniqified.
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin iface_a
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin iface_b
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" iface
LD_LIBRARY_PATH=$(pwd) ./iface
function _timeout() (
set -e
$2 &
p=$!
(sleep $1; kill $p 2>/dev/null) &
p2=$!
wait $p 2>/dev/null
kill -0 $p2 2>/dev/null
)
# Test for issue 18676 - make sure we don't add the same itab twice.
# The buggy code hangs forever, so use a timeout to check for that.
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o plugin.so src/issue18676/plugin.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue18676 src/issue18676/main.go
_timeout 10s ./issue18676
# Test for issue 19534 - that we can load a plugin built in a path with non-alpha
# characters
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -ldflags='-pluginpath=issue.19534' -o plugin.so src/issue19534/plugin.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue19534 src/issue19534/main.go
./issue19534
# Test for issue 18584
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o plugin.so src/issue18584/plugin.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue18584 src/issue18584/main.go
./issue18584
# Test for issue 19418
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin "-ldflags=-X main.Val=linkstr" -o plugin.so src/issue19418/plugin.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue19418 src/issue19418/main.go
./issue19418
# Test for issue 19529
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o plugin.so src/issue19529/plugin.go
# Test for issue 22175
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o issue22175_plugin1.so src/issue22175/plugin1.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o issue22175_plugin2.so src/issue22175/plugin2.go
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue22175 src/issue22175/main.go
./issue22175
# Test for issue 22295
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -buildmode=plugin -o issue.22295.so issue22295.pkg
GOPATH=$(pwd) go build -gcflags "$GO_GCFLAGS" -o issue22295 src/issue22295.pkg/main.go
./issue22295
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