add git config

Author: reshnm

go.mod

@@ -3,6 +3,7 @@ module github.com/openmcp-project/bootstrapper
 go 1.25.0
 
 require (
+	github.com/go-git/go-git/v5 v5.16.2
 	github.com/sirupsen/logrus v1.9.3
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.10.0
@@ -11,11 +12,29 @@ require (
 )
 
 require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
+	github.com/cloudflare/circl v1.6.1 // indirect
+	github.com/cyphar/filepath-securejoin v0.4.1 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.6.2 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
+	github.com/pjbgf/sha1cd v0.3.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
 	github.com/spf13/pflag v1.0.7 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
-	golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8 // indirect
+	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/net v0.39.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,33 +1,119 @@
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
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+github.com/cloudflare/circl v1.6.1 h1:zqIqSPIndyBh1bjLVVDHMPpVKqp8Su/V+6MeDzzQBQ0=
+github.com/cloudflare/circl v1.6.1/go.mod h1:uddAzsPgqdMAYatqJ0lsjX1oECcQLIlRpzZh3pJrofs=
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+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/git-config/config.go

@@ -0,0 +1,150 @@
+package gitconfig
+
+import (
+	"encoding/base64"
+	"fmt"
+	"os"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing/transport"
+	"github.com/go-git/go-git/v5/plumbing/transport/http"
+	"github.com/go-git/go-git/v5/plumbing/transport/ssh"
+	"sigs.k8s.io/yaml"
+)
+
+// Config represents the configuration for git operations.
+type Config struct {
+	Authentication Authentication `json:"auth,omitempty"`
+}
+
+// Authentication holds the authentication methods for git operations.
+type Authentication struct {
+	BasicAuth     *BasicAuth     `json:"basic,omitempty"`
+	BearerToken   *BearerToken   `json:"bearerToken,omitempty"`
+	SSHPrivateKey *SSHPrivateKey `json:"sshPrivateKey,omitempty"`
+}
+
+// BasicAuth represents basic authentication credentials.
+type BasicAuth struct {
+	// Username is the username for basic authentication.
+	Username string `json:"username,omitempty"`
+	// Password is the password for basic authentication.
+	Password string `json:"password,omitempty"`
+}
+
+// BearerToken represents a bearer token for authentication.
+// For popular Git servers (e.g. GitHub, Bitbucket, GitLab), use basic access authentication instead.
+type BearerToken struct {
+	// Token is the bearer token used for authentication.
+	Token string `json:"token,omitempty"`
+}
+
+// SSHPrivateKey represents an SSH private key for authentication.
+type SSHPrivateKey struct {
+	// PrivateKey is the base64 encoded SSH private key.
+	// Password protected keys are not yet supported.
+	PrivateKey string `json:"privateKey,omitempty"`
+	// KnownHosts is the path to the known hosts file for SSH.
+	KnownHosts string `json:"knownHosts,omitempty"`
+}
+
+// ParseConfig reads a YAML configuration file and returns a Config object.
+func ParseConfig(path string) (*Config, error) {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read config file: %w", err)
+	}
+	var config Config
+	if err := yaml.Unmarshal(data, &config); err != nil {
+		return nil, err
+	}
+	return &config, nil
+}
+
+// Validate checks the configuration for correctness.
+func (c *Config) Validate() error {
+	numMethods := 0
+	if c.Authentication.BasicAuth != nil {
+		numMethods++
+	}
+	if c.Authentication.BearerToken != nil {
+		numMethods++
+	}
+	if c.Authentication.SSHPrivateKey != nil {
+		numMethods++
+	}
+	if numMethods > 1 {
+		return fmt.Errorf("multiple authentication methods provided, only one is allowed")
+	}
+	if numMethods == 0 {
+		return fmt.Errorf("no authentication method provided, at least one is required")
+	}
+
+	if c.Authentication.BasicAuth != nil {
+		if c.Authentication.BasicAuth.Username == "" || c.Authentication.BasicAuth.Password == "" {
+			return fmt.Errorf("invalid basic authentication: username and password must be provided")
+		}
+	}
+	if c.Authentication.BearerToken != nil {
+		if c.Authentication.BearerToken.Token == "" {
+			return fmt.Errorf("invalid bearer token: token must be provided")
+		}
+	}
+	if c.Authentication.SSHPrivateKey != nil {
+		if c.Authentication.SSHPrivateKey.PrivateKey == "" {
+			return fmt.Errorf("invalid SSH private key: private key must be provided")
+		}
+	}
+
+	return nil
+}
+
+// ConfigureCloneOptions configures the provided git.CloneOptions with the authentication method from the Config.
+func (c *Config) ConfigureCloneOptions(options *git.CloneOptions) error {
+	auth, err := c.configureAuth()
+	if err != nil {
+		return err
+	}
+	options.Auth = auth
+	return nil
+}
+
+// ConfigurePushOptions configures the provided git.PushOptions with the authentication method from the Config.
+func (c *Config) ConfigurePushOptions(options *git.PushOptions) error {
+	auth, err := c.configureAuth()
+	if err != nil {
+		return err
+	}
+	options.Auth = auth
+	return nil
+}
+
+func (c *Config) configureAuth() (auth transport.AuthMethod, err error) {
+	if c.Authentication.BasicAuth != nil {
+		auth = &http.BasicAuth{
+			Username: c.Authentication.BasicAuth.Username,
+			Password: c.Authentication.BasicAuth.Password,
+		}
+	}
+
+	if c.Authentication.BearerToken != nil {
+		auth = &http.TokenAuth{
+			Token: c.Authentication.BearerToken.Token,
+		}
+	}
+
+	if c.Authentication.SSHPrivateKey != nil {
+		privateKeyDecoded, err := base64.StdEncoding.DecodeString(c.Authentication.SSHPrivateKey.PrivateKey)
+		if err != nil {
+			return nil, fmt.Errorf("failed to decode SSH private key: %w", err)
+		}
+
+		publicKeys, err := ssh.NewPublicKeys("git", privateKeyDecoded, "")
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse SSH private key: %w", err)
+		}
+		auth = publicKeys
+	}
+
+	return auth, nil
+}