mirror of
https://github.com/golang/go
synced 2024-09-15 22:20:06 +00:00
cmd/go/internal/cache: save more data from DefaultDir
cmd/go/main.go sets GOCACHE explicitly, so if we don't save some metadata about how DefaultDir arrived at its answer we will be unable to reconstruct it later. Fixes #29243 Change-Id: Ic8bb859ab045a29c91f6a4527e65aedabf874d53 Reviewed-on: https://go-review.googlesource.com/c/154309 Run-TryBot: Bryan C. Mills <bcmills@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Jay Conrod <jayconrod@google.com> Reviewed-by: Filippo Valsorda <filippo@golang.org>
This commit is contained in:
parent
47713567d9
commit
fd323a8cff
43
src/cmd/go/internal/cache/default.go
vendored
43
src/cmd/go/internal/cache/default.go
vendored
|
@ -37,8 +37,11 @@ See golang.org to learn more about Go.
|
|||
// the first time Default is called.
|
||||
func initDefaultCache() {
|
||||
dir := DefaultDir()
|
||||
if dir == "off" {
|
||||
die()
|
||||
if dir == "off" || dir == "" {
|
||||
if defaultDirErr != nil {
|
||||
base.Fatalf("build cache is required, but could not be located: %v", defaultDirErr)
|
||||
}
|
||||
base.Fatalf("build cache is disabled by GOCACHE=off, but required as of Go 1.12")
|
||||
}
|
||||
if err := os.MkdirAll(dir, 0777); err != nil {
|
||||
base.Fatalf("failed to initialize build cache at %s: %s\n", dir, err)
|
||||
|
@ -55,29 +58,35 @@ func initDefaultCache() {
|
|||
defaultCache = c
|
||||
}
|
||||
|
||||
var (
|
||||
defaultDirOnce sync.Once
|
||||
defaultDir string
|
||||
defaultDirErr error
|
||||
)
|
||||
|
||||
// DefaultDir returns the effective GOCACHE setting.
|
||||
// It returns "off" if the cache is disabled.
|
||||
func DefaultDir() string {
|
||||
dir := os.Getenv("GOCACHE")
|
||||
if dir != "" {
|
||||
return dir
|
||||
// Save the result of the first call to DefaultDir for later use in
|
||||
// initDefaultCache. cmd/go/main.go explicitly sets GOCACHE so that
|
||||
// subprocesses will inherit it, but that means initDefaultCache can't
|
||||
// otherwise distinguish between an explicit "off" and a UserCacheDir error.
|
||||
|
||||
defaultDirOnce.Do(func() {
|
||||
defaultDir = os.Getenv("GOCACHE")
|
||||
if defaultDir != "" {
|
||||
return
|
||||
}
|
||||
|
||||
// Compute default location.
|
||||
dir, err := os.UserCacheDir()
|
||||
if err != nil {
|
||||
return "off"
|
||||
defaultDir = "off"
|
||||
defaultDirErr = fmt.Errorf("GOCACHE is not defined and %v", err)
|
||||
return
|
||||
}
|
||||
return filepath.Join(dir, "go-build")
|
||||
}
|
||||
defaultDir = filepath.Join(dir, "go-build")
|
||||
})
|
||||
|
||||
// die calls base.Fatalf with a message explaining why DefaultDir was "off".
|
||||
func die() {
|
||||
if os.Getenv("GOCACHE") == "off" {
|
||||
base.Fatalf("build cache is disabled by GOCACHE=off, but required as of Go 1.12")
|
||||
}
|
||||
if _, err := os.UserCacheDir(); err != nil {
|
||||
base.Fatalf("build cache is required, but could not be located: %v", err)
|
||||
}
|
||||
panic(fmt.Sprintf("cache.die called unexpectedly with cache.DefaultDir() = %s", DefaultDir()))
|
||||
return defaultDir
|
||||
}
|
||||
|
|
24
src/cmd/go/testdata/script/build_nocache.txt
vendored
24
src/cmd/go/testdata/script/build_nocache.txt
vendored
|
@ -1,5 +1,22 @@
|
|||
# Set GOCACHE to a directory that doesn't allow writes.
|
||||
[windows] skip # Does not support unwritable directories.
|
||||
# As of Go 1.12, the module cache is required.
|
||||
|
||||
# If none of the variables we use to locate GOCACHE are set, the cache is off
|
||||
# and we cannot build.
|
||||
env GOCACHE=
|
||||
env XDG_CACHE_HOME=
|
||||
env HOME=
|
||||
[plan9] env home=
|
||||
[windows] env LocalAppData=
|
||||
! go build -o triv triv.go
|
||||
stderr 'build cache is required, but could not be located: GOCACHE is not defined and .*'
|
||||
|
||||
# An explicit GOCACHE=off also disables builds.
|
||||
env GOCACHE=off
|
||||
! go build -o triv triv.go
|
||||
stderr 'build cache is disabled by GOCACHE=off'
|
||||
|
||||
# If GOCACHE is set to an unwritable directory, we should diagnose it as such.
|
||||
[windows] stop # Does not support unwritable directories.
|
||||
[root] skip # Can write to unwritable directories.
|
||||
|
||||
mkdir $WORK/unwritable/home
|
||||
|
@ -8,9 +25,6 @@ chmod 0555 $WORK/unwritable/home
|
|||
[plan9] env home=$WORK/unwritable/home
|
||||
|
||||
env GOCACHE=$WORK/unwritable/home
|
||||
|
||||
# As of Go 1.12, the module cache is required:
|
||||
# failure to write to it should cause builds to fail.
|
||||
! go build -o triv triv.go
|
||||
stderr 'failed to initialize build cache.* permission denied'
|
||||
|
||||
|
|
Loading…
Reference in a new issue