Fix #3344

Signed-off-by: David Gageot <[email protected]>

Author: dgageot

pkg/skaffold/build/tag/git_commit.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"os/exec"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -89,9 +90,31 @@ func (c *GitCommit) GenerateFullyQualifiedImageName(workingDir string, imageName
 		return fmt.Sprintf("%s:%s-dirty", imageName, ref), nil
 	}
 
+	ref = gitTagToDockerTag(ref)
+
 	return fmt.Sprintf("%s:%s", imageName, ref), nil
 }
 
+func gitTagToDockerTag(text string) string {
+	withAuthorizedChars := regexp.MustCompile(`[^a-zA-Z0-9-._]`).ReplaceAllString(text, "_")
+
+	var authorizedPrefix string
+	for i := 0; i < len(withAuthorizedChars); i++ {
+		if withAuthorizedChars[i] == '-' || withAuthorizedChars[i] == '.' {
+			authorizedPrefix += "_"
+		} else {
+			break
+		}
+	}
+	withAuthorizedPrefix := authorizedPrefix + withAuthorizedChars[len(authorizedPrefix):]
+
+	if len(withAuthorizedPrefix) > 128 {
+		return withAuthorizedPrefix[0:128]
+	}
+
+	return withAuthorizedPrefix
+}
+
 func (c *GitCommit) makeGitTag(workingDir string) (string, error) {
 	args := make([]string, 0, 4)
 	switch c.variant {

pkg/skaffold/build/tag/git_commit_test.go

@@ -22,6 +22,7 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"strings"
 	"testing"
 	"time"
 
@@ -59,6 +60,25 @@ func TestGitCommit_GenerateFullyQualifiedImageName(t *testing.T) {
 					commit("initial")
 			},
 		},
+		{
+			description:            "clean worktree with tag containing a slash",
+			variantTags:            "test:v_2",
+			variantCommitSha:       "test:aea33bcc86b5af8c8570ff45d8a643202d63c808",
+			variantAbbrevCommitSha: "test:aea33bc",
+			variantTreeSha:         "test:bc69d50cda6897a6f2054e64b9059f038dc6fb0e",
+			variantAbbrevTreeSha:   "test:bc69d50",
+			createGitRepo: func(dir string) {
+				gitInit(t, dir).
+					write("source.go", "code").
+					add("source.go").
+					commit("initial").
+					tag("v/1").
+					write("other.go", "other").
+					add("other.go").
+					commit("second commit").
+					tag("v/2")
+			},
+		},
 		{
 			description:            "clean worktree with tags",
 			variantTags:            "test:v2",
@@ -341,6 +361,19 @@ func TestGitCommit_GenerateFullyQualifiedImageName(t *testing.T) {
 	}
 }
 
+func TestGitTagToDockerTag(t *testing.T) {
+	testutil.CheckDeepEqual(t, "", gitTagToDockerTag(""))
+	testutil.CheckDeepEqual(t, "abcdefghijklmnopqrstuvwxyz", gitTagToDockerTag("abcdefghijklmnopqrstuvwxyz"))
+	testutil.CheckDeepEqual(t, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", gitTagToDockerTag("ABCDEFGHIJKLMNOPQRSTUVWXYZ"))
+	testutil.CheckDeepEqual(t, "0123456789-_.", gitTagToDockerTag("0123456789-_."))
+	testutil.CheckDeepEqual(t, "v_1", gitTagToDockerTag("v/1"))
+	testutil.CheckDeepEqual(t, "v____1", gitTagToDockerTag("v%$@!1"))
+	testutil.CheckDeepEqual(t, "_v1", gitTagToDockerTag("_v1"))
+	testutil.CheckDeepEqual(t, "__v1", gitTagToDockerTag("--v1"))
+	testutil.CheckDeepEqual(t, "__v1", gitTagToDockerTag("..v1"))
+	testutil.CheckDeepEqual(t, 128, len(gitTagToDockerTag(strings.Repeat("0123456789", 20))))
+}
+
 // gitRepo deals with test git repositories
 type gitRepo struct {
 	dir      string