Fix branch checking logic

See https://github.com/go-git/go-git/issues/518 for why this is needed.

.drone.yml

@@ -3,17 +3,17 @@ kind: pipeline
 name: coopcloud.tech/abra
 steps:
   - name: make check
-    image: golang:1.19
+    image: golang:1.18
     commands:
       - make check
 
   - name: make build
-    image: golang:1.19
+    image: golang:1.18
     commands:
       - make build
 
   - name: make test
-    image: golang:1.19
+    image: golang:1.18
     commands:
       - make test
 
@@ -45,7 +45,7 @@ steps:
       event: tag
 
   - name: release
-    image: golang:1.19
+    image: golang:1.18
     environment:
       GITEA_TOKEN:
         from_secret: goreleaser_gitea_token

go.mod

@@ -46,7 +46,7 @@ require (
 	github.com/sergi/go-diff v1.2.0 // indirect
 	github.com/spf13/cobra v1.3.0 // indirect
 	github.com/theupdateframework/notary v0.7.0 // indirect
-	github.com/urfave/cli v1.22.5
+	github.com/urfave/cli v1.22.9
 	github.com/xanzy/ssh-agent v0.3.1 // indirect
 	github.com/xeipuuv/gojsonpointer v0.0.0-20190809123943-df4f5c81cb3b // indirect
 	golang.org/x/crypto v0.0.0-20220131195533-30dcbda58838

go.sum

@@ -982,8 +982,8 @@ github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijb
 github.com/urfave/cli v1.22.1/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/urfave/cli v1.22.2/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/urfave/cli v1.22.4/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
-github.com/urfave/cli v1.22.5 h1:lNq9sAHXK2qfdI8W+GRItjCEkI+2oR4d+MEHy1CKXoU=
+github.com/urfave/cli v1.22.9 h1:cv3/KhXGBGjEXLC4bH0sLuJ9BewaAbpk5oyMOveu4pw=
-github.com/urfave/cli v1.22.5/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
+github.com/urfave/cli v1.22.9/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
 github.com/vbatts/tar-split v0.11.2/go.mod h1:vV3ZuO2yWSVsz+pfFzDG/upWH1JhjOiEaWq6kXyQ3VI=
 github.com/vishvananda/netlink v0.0.0-20181108222139-023a6dafdcdf/go.mod h1:+SR5DhBJrl6ZM7CoCKvpw5BKroDKQ+PJqOg65H/2ktk=
 github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=

pkg/git/branch.go

@@ -5,6 +5,25 @@ import (
 	"github.com/go-git/go-git/v5/plumbing"
 )
 
+// Check if a branch exists in a repo.
+// Use this and not repository.Branch(), because the latter does not
+// actually check for existing branches.
+// See https://github.com/go-git/go-git/issues/518
+func HasBranch(repository *git.Repository, name string) bool {
+	var exist bool
+	if iter, err := repository.Branches(); err == nil {
+		iterFunc := func(reference *plumbing.Reference) error {
+			if name == reference.Name().Short() {
+				exist = true
+				return nil
+			}
+			return nil
+		}
+		_ = iter.ForEach(iterFunc)
+	}
+	return exist
+}
+
 // GetCurrentBranch retrieves the current branch of a repository
 func GetCurrentBranch(repository *git.Repository) (string, error) {
 	branchRefs, err := repository.Branches()

pkg/recipe/recipe.go

@@ -625,8 +625,8 @@ func GetDefaultBranch(repo *git.Repository, recipeName string) (plumbing.Referen
 	}
 
 	branch := "master"
-	if _, err := repo.Branch("master"); err != nil {
+	if !gitPkg.HasBranch(repo, "master") {
-		if _, err := repo.Branch("main"); err != nil {
+		if !gitPkg.HasBranch(repo, "main") {
 			return "", fmt.Errorf("failed to select default branch in %s", recipeDir)
 		}
 		branch = "main"

renovate.json

@@ -1,6 +1,3 @@
 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
-  "ignoreDeps": [
-    "github.com/urfave/cli"
-  ]
 }