Lookup correct remote for current branch

Fixes gopasspw#691

backend/sync/git/cli/config.go

@@ -1,7 +1,6 @@
 package cli
 
 import (
-	"bytes"
 	"context"
 	"fmt"
 	"io/ioutil"
@@ -80,17 +79,48 @@ func (g *Git) ConfigGet(ctx context.Context, key string) (string, error) {
 		return "", store.ErrGitNotInit
 	}
 
-	buf := &bytes.Buffer{}
+	buf := &strings.Builder{}
 
 	cmd := exec.CommandContext(ctx, "git", "config", "--get", key)
 	cmd.Dir = g.path
 	cmd.Stdout = buf
 	cmd.Stderr = os.Stderr
 
-	out.Debug(ctx, "store.gitConfigValue: %s %+v", cmd.Path, cmd.Args)
+	out.Debug(ctx, "store.gitConfigGet: %s %+v", cmd.Path, cmd.Args)
 	if err := cmd.Run(); err != nil {
 		return "", err
 	}
 
 	return strings.TrimSpace(buf.String()), nil
 }
+
+// ConfigList returns all git config settings
+func (g *Git) ConfigList(ctx context.Context) (map[string]string, error) {
+	if !g.IsInitialized() {
+		return nil, store.ErrGitNotInit
+	}
+
+	buf := &strings.Builder{}
+
+	cmd := exec.CommandContext(ctx, "git", "config", "--list")
+	cmd.Dir = g.path
+	cmd.Stdout = buf
+	cmd.Stderr = os.Stderr
+
+	out.Debug(ctx, "store.gitConfigList: %s %+v", cmd.Path, cmd.Args)
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	lines := strings.Split(buf.String(), "\n")
+	kv := make(map[string]string, len(lines))
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		p := strings.SplitN(line, "=", 2)
+		if len(p) < 2 {
+			continue
+		}
+		kv[p[0]] = p[1]
+	}
+	return kv, nil
+}

backend/sync/git/cli/git.go

@@ -186,18 +186,46 @@ func (g *Git) Commit(ctx context.Context, msg string) error {
 	return g.Cmd(ctx, "gitCommit", "commit", "-m", msg)
 }
 
+func (g *Git) defaultRemote(ctx context.Context, branch string) string {
+	opts, err := g.ConfigList(ctx)
+	if err != nil {
+		return "origin"
+	}
+
+	remote := opts["branch."+branch+".remote"]
+	if remote == "" {
+		return "origin"
+	}
+
+	needle := "remote." + remote + ".url"
+	for k := range opts {
+		if k == needle {
+			return remote
+		}
+	}
+	return "origin"
+}
+
+func (g *Git) defaultBranch(ctx context.Context) string {
+	out, _, err := g.captureCmd(ctx, "defaultBranch", "rev-parse", "--abbrev-ref", "HEAD")
+	if err != nil || string(out) == "" {
+		return "master"
+	}
+	return strings.TrimSpace(string(out))
+}
+
 // PushPull pushes the repo to it's origin.
 // optional arguments: remote and branch
 func (g *Git) PushPull(ctx context.Context, op, remote, branch string) error {
 	if !g.IsInitialized() {
 		return store.ErrGitNotInit
 	}
 
-	if remote == "" {
-		remote = "origin"
-	}
 	if branch == "" {
-		branch = "master"
+		branch = g.defaultBranch(ctx)
+	}
+	if remote == "" {
+		remote = g.defaultRemote(ctx, branch)
 	}
 
 	if v, err := g.ConfigGet(ctx, "remote."+remote+".url"); err != nil || v == "" {