1 files changed, 185 insertions, 0 deletions
diff --git a/repository/config_git.go b/repository/config_git.go
new file mode 100644
index 00000000..81b9b819
--- /dev/null
+++ b/repository/config_git.go
@@ -0,0 +1,185 @@
+package repository
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/blang/semver"
+	"github.com/pkg/errors"
+)
+
+type gitConfig struct {
+	version *semver.Version
+	execFn  func(args ...string) (string, error)
+}
+
+func NewGitConfig(repo *GitRepo, global bool) *gitConfig {
+	version, _ := repo.GitVersion()
+
+	if global {
+		return &gitConfig{
+			execFn: func(args ...string) (string, error) {
+				args = append([]string{"config", "--global"}, args...)
+				return repo.runGitCommand(args...)
+			},
+			version: version,
+		}
+	}
+
+	return &gitConfig{
+		execFn: func(args ...string) (string, error) {
+			args = append([]string{"config"}, args...)
+			return repo.runGitCommand(args...)
+		},
+		version: version,
+	}
+}
+
+// StoreConfig store a single key/value pair in the config of the repo
+func (gc *gitConfig) Store(key string, value string) error {
+	_, err := gc.execFn("--replace-all", key, value)
+
+	return err
+}
+
+// ReadConfigs read all key/value pair matching the key prefix
+func (gc *gitConfig) ReadAll(keyPrefix string) (map[string]string, error) {
+	stdout, err := gc.execFn("--get-regexp", keyPrefix)
+
+	//   / \
+	//  / ! \
+	// -------
+	//
+	// There can be a legitimate error here, but I see no portable way to
+	// distinguish them from the git error that say "no matching value exist"
+	if err != nil {
+		return nil, nil
+	}
+
+	lines := strings.Split(stdout, "\n")
+
+	result := make(map[string]string, len(lines))
+
+	for _, line := range lines {
+		if strings.TrimSpace(line) == "" {
+			continue
+		}
+
+		parts := strings.Fields(line)
+		if len(parts) != 2 {
+			return nil, fmt.Errorf("bad git config: %s", line)
+		}
+
+		result[parts[0]] = parts[1]
+	}
+
+	return result, nil
+}
+
+func (gc *gitConfig) ReadString(key string) (string, error) {
+	stdout, err := gc.execFn("--get-all", key)
+
+	//   / \
+	//  / ! \
+	// -------
+	//
+	// There can be a legitimate error here, but I see no portable way to
+	// distinguish them from the git error that say "no matching value exist"
+	if err != nil {
+		return "", ErrNoConfigEntry
+	}
+
+	lines := strings.Split(stdout, "\n")
+
+	if len(lines) == 0 {
+		return "", ErrNoConfigEntry
+	}
+	if len(lines) > 1 {
+		return "", ErrMultipleConfigEntry
+	}
+
+	return lines[0], nil
+}
+
+func (gc *gitConfig) ReadBool(key string) (bool, error) {
+	val, err := gc.ReadString(key)
+	if err != nil {
+		return false, err
+	}
+
+	return strconv.ParseBool(val)
+}
+
+func (gc *gitConfig) rmSection(keyPrefix string) error {
+	_, err := gc.execFn("--remove-section", keyPrefix)
+	return err
+}
+
+func (gc *gitConfig) unsetAll(keyPrefix string) error {
+	_, err := gc.execFn("--unset-all", keyPrefix)
+	return err
+}
+
+// return keyPrefix section
+// example: sectionFromKey(a.b.c.d) return a.b.c
+func sectionFromKey(keyPrefix string) string {
+	s := strings.Split(keyPrefix, ".")
+	if len(s) == 1 {
+		return keyPrefix
+	}
+
+	return strings.Join(s[:len(s)-1], ".")
+}
+
+// rmConfigs with git version lesser than 2.18
+func (gc *gitConfig) rmConfigsGitVersionLT218(keyPrefix string) error {
+	// try to remove key/value pair by key
+	err := gc.unsetAll(keyPrefix)
+	if err != nil {
+		return gc.rmSection(keyPrefix)
+	}
+
+	m, err := gc.ReadAll(sectionFromKey(keyPrefix))
+	if err != nil {
+		return err
+	}
+
+	// if section doesn't have any left key/value remove the section
+	if len(m) == 0 {
+		return gc.rmSection(sectionFromKey(keyPrefix))
+	}
+
+	return nil
+}
+
+// RmConfigs remove all key/value pair matching the key prefix
+func (gc *gitConfig) RemoveAll(keyPrefix string) error {
+	// starting from git 2.18.0 sections are automatically deleted when the last existing
+	// key/value is removed. Before 2.18.0 we should remove the section
+	// see https://github.com/git/git/blob/master/Documentation/RelNotes/2.18.0.txt#L379
+	lt218, err := gc.gitVersionLT218()
+	if err != nil {
+		return errors.Wrap(err, "getting git version")
+	}
+
+	if lt218 {
+		return gc.rmConfigsGitVersionLT218(keyPrefix)
+	}
+
+	err = gc.unsetAll(keyPrefix)
+	if err != nil {
+		return gc.rmSection(keyPrefix)
+	}
+
+	return nil
+}
+
+func (gc *gitConfig) gitVersionLT218() (bool, error) {
+	gitVersion218, err := semver.Make("2.18.0")
+	if err != nil {
+		return false, err
+	}
+
+	return gc.version.LT(gitVersion218), nil
+}