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cmd/go: TestNewReleaseRebuildsStalePackagesInGOPATH modifies code in GOROOT #29263

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bcmills opened this issue Dec 14, 2018 · 4 comments
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cmd/go: TestNewReleaseRebuildsStalePackagesInGOPATH modifies code in GOROOT #29263

bcmills opened this issue Dec 14, 2018 · 4 comments
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FrozenDueToAge GoCommand cmd/go NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. Testing An issue that has been verified to require only test changes, not just a test failure.
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Go1.13

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@bcmills
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bcmills commented Dec 14, 2018

go test cmd/go should succeed even if the user cannot write to GOROOT, as may be the case if the Go toolchain is provided by a system distribution. (See also #28387.)

Unfortunately, today TestNewReleaseRebuildsStalePackagesInGOPATH assumes that it can write to GOROOT/src:

go/src/cmd/go/go_test.go

Line 903 in dbd323b

sys := runtime.GOROOT() + "/src/runtime/internal/sys/sys.go"

That not only risks a failed write to an unwritable directory, but also makes go test cmd/go dangerous to run concurrently with any build information, and potentially introduces spurious diffs during testing in development copies of the go repository.
@bcmills bcmills added the Testing An issue that has been verified to require only test changes, not just a test failure. label Dec 14, 2018
@bcmills bcmills added this to the Go1.13 milestone Dec 14, 2018
@bcmills bcmills added NeedsFix The path to resolution is known, but the work has not been done. GoCommand cmd/go NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. labels Dec 14, 2018
@gopherbot gopherbot removed the NeedsFix The path to resolution is known, but the work has not been done. label Dec 14, 2018
@bcmills
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bcmills commented Dec 14, 2018

One possible resolution might be to copy relevant parts of GOROOT into a temporary directory.

@bcmills
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bcmills commented Dec 14, 2018

CC @ianlancetaylor @rsc

@ianlancetaylor
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I sent a fix for that test but there are probably others.

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Change https://golang.org/cl/154460 mentions this issue: cmd/go: don't modify GOROOT in TestNewReleaseRebuildsStalePackagesInGOPATH

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FrozenDueToAge GoCommand cmd/go NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. Testing An issue that has been verified to require only test changes, not just a test failure.
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