Add MUTAGEN_PROJECT_FILE env variable

By default `mutagen project` looks for a config file named 'mutagen.yml'
to load project configuration. This change gives us the ability to
customize that with an environment variable.

Author: jmera

cmd/mutagen/project/flush.go

@@ -28,7 +28,7 @@ func flushMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if flushConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(flushConfiguration.projectFile)

cmd/mutagen/project/list.go

@@ -29,7 +29,7 @@ func listMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if listConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(listConfiguration.projectFile)

cmd/mutagen/project/pause.go

@@ -30,7 +30,7 @@ func pauseMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if pauseConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(pauseConfiguration.projectFile)

cmd/mutagen/project/reset.go

@@ -28,7 +28,7 @@ func resetMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if resetConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(resetConfiguration.projectFile)

cmd/mutagen/project/resume.go

@@ -30,7 +30,7 @@ func resumeMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if resumeConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(resumeConfiguration.projectFile)

cmd/mutagen/project/run.go

@@ -33,7 +33,7 @@ func runMain(_ *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if runConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(runConfiguration.projectFile)

cmd/mutagen/project/start.go

@@ -39,7 +39,7 @@ func startMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if startConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(startConfiguration.projectFile)

cmd/mutagen/project/terminate.go

@@ -30,7 +30,7 @@ func terminateMain(command *cobra.Command, arguments []string) error {
 	// relative paths (including relative synchronization paths and relative
 	// Unix Domain Socket paths) to be resolved relative to the project
 	// configuration file.
-	configurationFileName := project.DefaultConfigurationFileName
+	configurationFileName := project.ConfigurationFileName
 	if terminateConfiguration.projectFile != "" {
 		var directory string
 		directory, configurationFileName = filepath.Split(terminateConfiguration.projectFile)

pkg/project/paths.go

@@ -1,9 +1,19 @@
 package project
 
+import "os"
+
+func configurationFileName() string {
+  fileName := os.Getenv("MUTAGEN_PROJECT_FILE")
+  if len(fileName) == 0 {
+    return "mutagen.yml"
+  }
+  return file
+}
+
 const (
-	// DefaultConfigurationFileName is the name of the Mutagen project
-	// configuration file.
-	DefaultConfigurationFileName = "mutagen.yml"
+	// ConfigurationFileName is the name of the Mutagen project configuration
+	// file.
+	ConfigurationFileName = configurationFileName()
 	// LockFileExtension is the extension added to a configuration file path in
 	// order to compute the corresponding lock file.
 	LockFileExtension = ".lock"