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cmd/go/internal/modfetch/codehost: report git errors more accurately

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Previously, if you attempted to fetch a private repository, or your
Git/curl client failed for an unknown reason, codehost would return an
UnknownRevisionError, which reported that a given revision in go.mod
was "unknown". This is confusing to many users who can go look in
their browser for example and see that the commit-ish exists.

Instead check whether "git ls-remote" exited with an error, and if so,
return that instead of the UnknownRevision message.

Fixes #42751.

Change-Id: I0dbded878b2818280e61126a4493767d719ad577
Reviewed-on: https://go-review.googlesource.com/c/go/+/297950
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Trust: Bryan C. Mills <bcmills@google.com>
Trust: Jay Conrod <jayconrod@google.com>
Run-TryBot: Bryan C. Mills <bcmills@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Kevin Burke 2021-03-02 11:54:36 -08:00 committed by Kevin Burke
parent 44721f4565
commit 39bdd41d03
2 changed files with 36 additions and 0 deletions
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6
src/cmd/go/internal/modfetch/codehost/git.go
View File

@ -296,6 +296,9 @@ func (r *gitRepo) stat(rev string) (*RevInfo, error) {
// Or maybe it's the prefix of a hash of a named ref.
// Try to resolve to both a ref (git name) and full (40-hex-digit) commit hash.
r.refsOnce.Do(r.loadRefs)
// loadRefs may return an error if git fails, for example segfaults, or
// could not load a private repo, but defer checking to the else block
// below, in case we already have the rev in question in the local cache.
var ref, hash string
if r.refs["refs/tags/"+rev] != "" {
ref = "refs/tags/" + rev
@ -332,6 +335,9 @@ func (r *gitRepo) stat(rev string) (*RevInfo, error) {
hash = rev
}
} else {
if r.refsErr != nil {
return nil, r.refsErr
}
return nil, &UnknownRevisionError{Rev: rev}
}

30
src/cmd/go/testdata/script/mod_get_private_vcs.txt vendored
View File

@ -9,3 +9,33 @@ env GOPROXY=direct
stderr 'Confirm the import path was entered correctly.'
stderr 'If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.'
! stdout .
# Fetching a nonexistent commit should return an "unknown revision"
# error message.
! go get github.com/golang/term@86186f3aba07ed0212cfb944f3398997d2d07c6b
stderr '^go get: github.com/golang/term@86186f3aba07ed0212cfb944f3398997d2d07c6b: invalid version: unknown revision 86186f3aba07ed0212cfb944f3398997d2d07c6b$'
! stdout .
! go get github.com/golang/nonexist@master
stderr '^Confirm the import path was entered correctly.$'
stderr '^If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.$'
! stderr 'unknown revision'
! stdout .
[!linux] stop
# Test that Git clone errors will be shown to the user instead of a generic
# "unknown revision" error. To do this we want to force git ls-remote to return
# an error we don't already have special handling for. See golang/go#42751.
#
# Set XDG_CONFIG_HOME to tell Git where to look for the git config file listed
# below, which turns on ssh.
env XDG_CONFIG_HOME=$TMPDIR
! go install github.com/golang/nonexist@master
stderr 'fatal: Could not read from remote repository.'
! stderr 'unknown revision'
! stdout .
-- $TMPDIR/git/config --
[url "git@github.com:"]
insteadOf = https://github.com/