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cmd/go/internal/{clean,test}: lock testexpire.txt

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Also check to make sure we don't overwrite a newer timestamp with an
older one.

testexpire.txt may be written concurrently, and a partially-written
timestamp may appear much older than the actual intended one. We don't
want to re-run tests that should still be cached.

Updates #26794

Change-Id: If56348e799f0e7be3c5bc91b4a336e23ad99f791
Reviewed-on: https://go-review.googlesource.com/c/146379
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Bryan C. Mills 2018-10-23 15:39:07 -04:00
parent 47dc928246
commit c124a91971
2 changed files with 18 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
src/cmd/go/internal/clean/clean.go
View File

@ -10,6 +10,7 @@ import (
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
@ -17,6 +18,7 @@ import (
"cmd/go/internal/cache"
"cmd/go/internal/cfg"
"cmd/go/internal/load"
"cmd/go/internal/lockedfile"
"cmd/go/internal/modfetch"
"cmd/go/internal/modload"
"cmd/go/internal/work"
@ -146,7 +148,20 @@ func runClean(cmd *base.Command, args []string) {
// right now are to be ignored.
dir := cache.DefaultDir()
if dir != "off" {
err := ioutil.WriteFile(filepath.Join(dir, "testexpire.txt"), []byte(fmt.Sprintf("%d\n", time.Now().UnixNano())), 0666)
f, err := lockedfile.Edit(filepath.Join(dir, "testexpire.txt"))
if err == nil {
now := time.Now().UnixNano()
buf, _ := ioutil.ReadAll(f)
prev, _ := strconv.ParseInt(strings.TrimSpace(string(buf)), 10, 64)
if now > prev {
if err = f.Truncate(0); err == nil {
_, err = fmt.Fprintf(f, "%d\n", now)
}
}
if closeErr := f.Close(); err == nil {
err = closeErr
}
}
if err != nil {
base.Errorf("go clean -testcache: %v", err)
}

3
src/cmd/go/internal/test/test.go
View File

@ -27,6 +27,7 @@ import (
"cmd/go/internal/cache"
"cmd/go/internal/cfg"
"cmd/go/internal/load"
"cmd/go/internal/lockedfile"
"cmd/go/internal/modload"
"cmd/go/internal/str"
"cmd/go/internal/work"
@ -566,7 +567,7 @@ func runTest(cmd *base.Command, args []string) {
// (We implement go clean -testcache by writing an expiration date
// instead of searching out and deleting test result cache entries.)
if dir := cache.DefaultDir(); dir != "off" {
if data, _ := ioutil.ReadFile(filepath.Join(dir, "testexpire.txt")); len(data) > 0 && data[len(data)-1] == '\n' {
if data, _ := lockedfile.Read(filepath.Join(dir, "testexpire.txt")); len(data) > 0 && data[len(data)-1] == '\n' {
if t, err := strconv.ParseInt(string(data[:len(data)-1]), 10, 64); err == nil {
testCacheExpire = time.Unix(0, t)
}