fix(linux): DOCKER_CONFIG path (runfinch#1102)

* fix(linux): DOCKER_CONFIG path

Signed-off-by: Justin Alvarez <[email protected]>

* rename DockerConfigPath to DockerConfigDir and update comment

Signed-off-by: Justin Alvarez <[email protected]>

---------

Signed-off-by: Justin Alvarez <[email protected]>

Author: pendo324

Diff for: cmd/finch/main_native.go

@@ -86,6 +86,7 @@ var newApp = func(
 		logger,
 		fp.NerdctlConfigFilePath(),
 		fp.BuildkitSocketPath(),
+		fp.DockerConfigDir(),
 		fp.FinchDependencyBinDir(),
 		system.NewStdLib(),
 	)

Diff for: pkg/command/nerdctl_native.go

@@ -20,6 +20,7 @@ import (
 const (
 	EnvKeyNerdctlTOML  = "NERDCTL_TOML"
 	EnvKeyBuildkitHost = "BUILDKIT_HOST"
+	EnvKeyDockerConfig = "DOCKER_CONFIG"
 )
 
 type nerdctlCmdCreator struct {
@@ -28,6 +29,7 @@ type nerdctlCmdCreator struct {
 	systemDeps         NerdctlCmdCreatorSystemDeps
 	nerdctlConfigPath  string
 	buildkitSocketPath string
+	dockerConfigPath   string
 	binPath            string
 }
 
@@ -39,6 +41,7 @@ func NewNerdctlCmdCreator(
 	logger flog.Logger,
 	nerdctlConfigPath string,
 	buildkitSocketPath string,
+	dockerConfigPath string,
 	binPath string,
 	systemDeps NerdctlCmdCreatorSystemDeps,
 ) NerdctlCmdCreator {
@@ -47,6 +50,7 @@ func NewNerdctlCmdCreator(
 		logger:             logger,
 		nerdctlConfigPath:  nerdctlConfigPath,
 		buildkitSocketPath: buildkitSocketPath,
+		dockerConfigPath:   dockerConfigPath,
 		binPath:            binPath,
 		systemDeps:         systemDeps,
 	}
@@ -65,6 +69,7 @@ func (ncc *nerdctlCmdCreator) create(stdin io.Reader, stdout, stderr io.Writer,
 	newPathEnv = append(
 		newPathEnv,
 		fmt.Sprintf("%s=%s", EnvKeyNerdctlTOML, ncc.nerdctlConfigPath),
+		fmt.Sprintf("%s=%s", EnvKeyDockerConfig, ncc.dockerConfigPath),
 		fmt.Sprintf("%s=unix://%s", EnvKeyBuildkitHost, ncc.buildkitSocketPath),
 	)
 

Diff for: pkg/command/nerdctl_native_test.go

@@ -18,6 +18,7 @@ import (
 const (
 	mockNerdctlConfigPath  = "/etc/finch/nerdctl.toml"
 	mockBuildkitSocketPath = "/etc/finch/buildkit"
+	mockDockerConfigPath   = "/etc/finch/docker"
 	mockFinchBinPath       = "/usr/lib/usrexec/finch"
 	mockSystemPath         = "/usr/bin"
 	finalPath              = mockFinchBinPath + command.EnvKeyPathJoiner + mockSystemPath
@@ -47,6 +48,7 @@ func TestLimaCmdCreator_Create(t *testing.T) {
 				cmd.EXPECT().SetEnv([]string{
 					fmt.Sprintf("%s=%s", command.EnvKeyPath, finalPath),
 					fmt.Sprintf("%s=%s", command.EnvKeyNerdctlTOML, mockNerdctlConfigPath),
+					fmt.Sprintf("%s=%s", command.EnvKeyDockerConfig, mockDockerConfigPath),
 					fmt.Sprintf("%s=unix://%s", command.EnvKeyBuildkitHost, mockBuildkitSocketPath),
 				})
 				cmd.EXPECT().SetStdin(nil)
@@ -72,6 +74,7 @@ func TestLimaCmdCreator_Create(t *testing.T) {
 				logger,
 				mockNerdctlConfigPath,
 				mockBuildkitSocketPath,
+				mockDockerConfigPath,
 				mockFinchBinPath,
 				lcd,
 			).Create(mockArgs...)

Diff for: pkg/path/finch_linux.go

@@ -34,6 +34,12 @@ func (fp Finch) BuildkitSocketPath() string {
 	return filepath.Join(fp.FinchRuntimeDataDir(), "buildkit", "buildkitd.sock")
 }
 
+// DockerConfigDir returns the path to the docker config file.
+// nerdctl uses ${DOCKER_CONFIG}/config.json for authentication with image registries.
+func (fp Finch) DockerConfigDir() string {
+	return filepath.Join(string(fp), "docker")
+}
+
 // FinchDependencyBinDir returns the path to Finch's local helper or dependency binaries.
 // Currently used for vended version of BuildKit.
 func (Finch) FinchDependencyBinDir() string {