cmd/go: tests: rename git-min-vers->git-sha256

Follow-up cleanup on go.dev/cl/698835. Clarify the tests by replacing
git-min-vers with a more-puposeful git-sha256 verb in the cmd tests.

Updates: #73704

Change-Id: I4361356431d567a6a3bb3a50eadfaa9e3ba37d90
Reviewed-on: https://go-review.googlesource.com/c/go/+/720481
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Junyang Shao <shaojunyang@google.com>
Reviewed-by: Michael Matloob <matloob@google.com>
Reviewed-by: Michael Matloob <matloob@golang.org>

src/cmd/go/internal/vcweb/script.go

@@ -44,7 +44,7 @@ func newScriptEngine() *script.Engine {
 		return script.OnceCondition(summary, func() (bool, error) { return f(), nil })
 	}
 	add("bzr", lazyBool("the 'bzr' executable exists and provides the standard CLI", hasWorkingBzr))
-	add("git-min-vers", script.PrefixCondition("<suffix> indicates a minimum git version", hasAtLeastGitVersion))
+	add("git-sha256", script.OnceCondition("the local 'git' version is recent enough to support sha256 object/commit hashes", gitSupportsSHA256))
 
 	interrupt := func(cmd *exec.Cmd) error { return cmd.Process.Signal(os.Interrupt) }
 	gracePeriod := 30 * time.Second // arbitrary
@@ -412,10 +412,14 @@ func gitVersion() (string, error) {
 	return "v" + string(matches[1]), nil
 }
 
-func hasAtLeastGitVersion(s *script.State, minVers string) (bool, error) {
+func hasAtLeastGitVersion(minVers string) (bool, error) {
 	gitVers, gitVersErr := gitVersion()
 	if gitVersErr != nil {
 		return false, gitVersErr
 	}
 	return semver.Compare(minVers, gitVers) <= 0, nil
 }
+
+func gitSupportsSHA256() (bool, error) {
+	return hasAtLeastGitVersion("v2.29")
+}

src/cmd/go/scriptconds_test.go

@@ -44,7 +44,7 @@ func scriptConditions(t *testing.T) map[string]script.Cond {
 	add("case-sensitive", script.OnceCondition("$WORK filesystem is case-sensitive", isCaseSensitive))
 	add("cc", script.PrefixCondition("go env CC = <suffix> (ignoring the go/env file)", ccIs))
 	add("git", lazyBool("the 'git' executable exists and provides the standard CLI", hasWorkingGit))
-	add("git-min-vers", script.PrefixCondition("<suffix> indicates a minimum git version", hasAtLeastGitVersion))
+	add("git-sha256", script.OnceCondition("the local 'git' version is recent enough to support sha256 object/commit hashes", gitSupportsSHA256))
 	add("net", script.PrefixCondition("can connect to external network host <suffix>", hasNet))
 	add("trimpath", script.OnceCondition("test binary was built with -trimpath", isTrimpath))
 
@@ -171,7 +171,7 @@ func gitVersion() (string, error) {
 	return "v" + string(matches[1]), nil
 }
 
-func hasAtLeastGitVersion(s *script.State, minVers string) (bool, error) {
+func hasAtLeastGitVersion(minVers string) (bool, error) {
 	gitVers, gitVersErr := gitVersion()
 	if gitVersErr != nil {
 		return false, gitVersErr
@@ -179,6 +179,10 @@ func hasAtLeastGitVersion(s *script.State, minVers string) (bool, error) {
 	return semver.Compare(minVers, gitVers) <= 0, nil
 }
 
+func gitSupportsSHA256() (bool, error) {
+	return hasAtLeastGitVersion("v2.29")
+}
+
 func hasWorkingBzr() bool {
 	bzr, err := exec.LookPath("bzr")
 	if err != nil {

src/cmd/go/testdata/script/README

@@ -399,8 +399,8 @@ The available conditions are:
 	GOOS/GOARCH supports -fuzz with instrumentation
 [git]
 	the 'git' executable exists and provides the standard CLI
-[git-min-vers:*]
+[git-sha256]
-	<suffix> indicates a minimum git version
+	the local 'git' version is recent enough to support sha256 object/commit hashes
 [go-builder]
 	GO_BUILDER_NAME is non-empty
 [link]

src/cmd/go/testdata/script/build_git_sha256_go_get_branch.txt

@@ -1,6 +1,6 @@
 [short] skip
 [!git] skip
-[!git-min-vers:v2.29] skip
+[!git-sha256] skip
 
 env GOPRIVATE=vcs-test.golang.org
 

src/cmd/go/testdata/script/build_git_sha256_moddep.txt

@@ -1,6 +1,6 @@
 [short] skip
 [!git] skip
-[!git-min-vers:v2.29] skip
+[!git-sha256] skip
 
 env GOPRIVATE=vcs-test.golang.org
 

src/cmd/go/testdata/script/mod_download_git_bareRepository_sha256.txt

@@ -1,6 +1,6 @@
 [short] skip
 [!git] skip
-[!git-min-vers:v2.29] skip
+[!git-sha256] skip
 
 # This is a git sha256-mode copy of mod_download_git_bareRepository
 

src/cmd/go/testdata/vcstest/git/gitrepo-sha256.txt

@@ -1,4 +1,4 @@
-[!git-min-vers:v2.29] skip
+[!git-sha256] skip
 
 handle git