avoid import to testing helpers outside of tests

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

util/gitutil/gittestutil/testutil.go

@@ -0,0 +1,95 @@
+package gittestutil
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/docker/buildx/util/gitutil"
+	"github.com/stretchr/testify/require"
+)
+
+func GitInit(c *gitutil.Git, tb testing.TB) {
+	tb.Helper()
+	out, err := fakeGit(c, "init")
+	require.NoError(tb, err)
+	require.Contains(tb, out, "Initialized empty Git repository")
+	require.NoError(tb, err)
+	GitCheckoutBranch(c, tb, "main")
+	_, _ = fakeGit(c, "branch", "-D", "master")
+}
+
+func GitCommit(c *gitutil.Git, tb testing.TB, msg string) {
+	tb.Helper()
+	out, err := fakeGit(c, "commit", "--allow-empty", "-m", msg)
+	require.NoError(tb, err)
+	require.Contains(tb, out, "main", msg)
+}
+
+func GitTag(c *gitutil.Git, tb testing.TB, tag string) {
+	tb.Helper()
+	out, err := fakeGit(c, "tag", tag)
+	require.NoError(tb, err)
+	require.Empty(tb, out)
+}
+
+func GitCheckoutBranch(c *gitutil.Git, tb testing.TB, name string) {
+	tb.Helper()
+	out, err := fakeGit(c, "checkout", "-b", name)
+	require.NoError(tb, err)
+	require.Empty(tb, out)
+}
+
+func GitAdd(c *gitutil.Git, tb testing.TB, files ...string) {
+	tb.Helper()
+	args := append([]string{"add"}, files...)
+	_, err := fakeGit(c, args...)
+	require.NoError(tb, err)
+}
+
+func GitSetRemote(c *gitutil.Git, tb testing.TB, name string, url string) {
+	tb.Helper()
+	_, err := fakeGit(c, "remote", "add", name, url)
+	require.NoError(tb, err)
+}
+
+func GitSetMainUpstream(c *gitutil.Git, tb testing.TB, remote, target string) {
+	tb.Helper()
+	_, err := fakeGit(c, "fetch", "--depth", "1", remote, target)
+	require.NoError(tb, err)
+
+	_, err = fakeGit(c, "branch", "--set-upstream-to", remote+"/"+target, "main")
+	require.NoError(tb, err)
+}
+
+func Mktmp(tb testing.TB) string {
+	tb.Helper()
+	folder := tb.TempDir()
+	current, err := os.Getwd()
+	require.NoError(tb, err)
+	require.NoError(tb, os.Chdir(folder))
+	tb.Cleanup(func() {
+		require.NoError(tb, os.Chdir(current))
+	})
+	return folder
+}
+
+func fakeGit(c *gitutil.Git, args ...string) (string, error) {
+	allArgs := []string{
+		"-c", "user.name=buildx",
+		"-c", "user.email=buildx@docker.com",
+		"-c", "commit.gpgSign=false",
+		"-c", "tag.gpgSign=false",
+		"-c", "log.showSignature=false",
+	}
+	allArgs = append(allArgs, args...)
+	return c.Run(allArgs...)
+}
+
+func IsAmbiguousArgument(err error) bool {
+	if err == nil {
+		return false
+	}
+	errMsg := strings.ToLower(err.Error())
+	return strings.Contains(errMsg, "use '--' to separate paths from revisions")
+}