env GO111MODULE=on
env GOPROXY=direct
env GOSUMDB=off

# go mod download with the pseudo-version should invoke git but not have a TagSum or Ref.
go mod download -x -json vcs-test.golang.org/git/hello.git@v0.0.0-20170922010558-fc3a09f3dc5c
stderr 'git( .*)* fetch'
cp stdout hellopseudo.json
! stdout '"(Query|TagPrefix|TagSum|Ref)"'
stdout '"Version": "v0.0.0-20170922010558-fc3a09f3dc5c"'
stdout '"VCS": "git"'
stdout '"URL": ".*/git/hello"'

cp stdout has-nested.json
stdout '"Origin":'
stdout '"VCS": "git"'
stdout '"URL":'  # randomly-chosen vcweb localhost URL
stdout '"Subdir": "nested"'
stdout '"TagPrefix": "nested/"'
stdout '"TagSum": "t1:47DEQpj8HBSa\+/TImW\+5JCeuQeRkm5NMpJWZG3hSuFU="'
stdout '"Ref": "refs/tags/has-nested"'
stdout '"Hash": "08a4fa6bb9c04ffba03b26ae427b0d6335d90a2a"'

stdout '"Ref": "HEAD"'
stdout '"TagSum": "t1:47DEQpj8HBSa\+/TImW\+5JCeuQeRkm5NMpJWZG3hSuFU="'

go list -reuse=git-latest.json -m -json vcs-test.golang.org/git/issue61415.git@latest
stdout '"Version": "v0.0.0-20231114180001-f213069baa68"'
stdout '"Origin":'
stdout '"VCS": "git"'
stdout '"Hash": "f213069baa68ec26412fb373c7cf6669db1f8e69"'
stdout '"Ref": "HEAD"'
stdout '"TagSum": "t1:47DEQpj8HBSa\+/TImW\+5JCeuQeRkm5NMpJWZG3hSuFU="'

	merged := *m1
	if m2.Hash != "" {
		if m1.Hash != "" && m1.Hash != m2.Hash {
			return nil
		}
		merged.Hash = m2.Hash
	}
	if m2.TagSum != "" {
		if m1.TagSum != "" && (m1.TagSum != m2.TagSum || m1.TagPrefix != m2.TagPrefix) {
			return nil
		}
		merged.TagSum = m2.TagSum
		merged.TagPrefix = m2.TagPrefix
	}
	if m2.Ref != "" {
		if m1.Ref != "" && m1.Ref != m2.Ref {
			return nil
		}

	}

	// Note: Can have Hash with no Ref and no TagSum and no RepoSum,
	// meaning the Hash simply has to remain in the repo.
	// In that case we assume it does in the absence of any real way to check.
	// But if neither Hash nor TagSum is present, we have nothing to check,
	// which we take to mean we didn't record enough information to be sure.
	if old.Hash == "" && old.TagSum == "" && old.RepoSum == "" {

	Hash string `json:",omitempty"` // commit hash or ID

	// If TagSum is non-empty, then the resolution of this module version
	// depends on the set of tags present in the repo, specifically the tags
	// of the form TagPrefix + a valid semver version.
	// If the matching repo tags and their commit hashes still hash to TagSum,
	// the Origin is still valid (at least as far as the tags are concerned).

		if origin.TagSum == "" {
			return fmt.Errorf("query %q requires a TagSum", query)
		}

	default:
		// The query may be "latest" or a version inequality or prefix.
		// Its result depends on the absence of higher tags matching the query,
		// not just the state of an individual ref or tag.
		if origin.TagSum == "" {
			return fmt.Errorf("query %q requires a TagSum", query)
		}

	unlock, err := r.mu.Lock()
	if err != nil {
		return nil, err
	}
	defer unlock()

	r.tagsOnce.Do(func() { r.loadTags(ctx) })
	tags := &Tags{
		// None of the other VCS provide a reasonable way to compute TagSum
		// without downloading the whole repo, so we only include VCS and URL
		// in the Origin.
		Origin: &Origin{
			VCS: r.cmd.vcs,
			URL: r.remote,
		},
		List: []Tag{},
	}
	for tag := range r.tags {

			if tagsErr != nil {
				revInfo.Origin = nil
				if err == nil {
					err = tagsErr
				}
			} else {
				origin.TagPrefix = tags.Origin.TagPrefix
				origin.TagSum = tags.Origin.TagSum
			}
		}
	}()

	// If this is a plain tag (no dir/ prefix)
	// and the module path is unversioned,
	// and if the underlying file tree has no go.mod,

		clean := *info
		info = &clean
		o := *info.Origin
		info.Origin = &o

		// Tags never matter if you are starting with a semver version,
		// as we would be when finding this cache entry.
		o.TagSum = ""
		o.TagPrefix = ""
		// Ref doesn't matter if you have a pseudoversion.
		if module.IsPseudoVersion(info.Version) {
			o.Ref = ""
		}
	}

	js, err := json.Marshal(info)
	if err != nil {