implement runtime file selection

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

internal/locker/pidfile.go

@@ -19,8 +19,8 @@ package locker
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 
-	"github.com/adrg/xdg"
 	"github.com/docker/docker/pkg/pidfile"
 )
 
@@ -29,10 +29,11 @@ type Pidfile struct {
 }
 
 func NewPidfile(projectName string) (*Pidfile, error) {
-	path, err := xdg.RuntimeFile(fmt.Sprintf("docker-compose.%s.pid", projectName))
+	run, err := runDir()
 	if err != nil {
 		return nil, err
 	}
+	path := filepath.Join(run, fmt.Sprintf("%s.pid", projectName))
 	return &Pidfile{path: path}, nil
 }
 

internal/locker/runtime.go

@@ -0,0 +1,35 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package locker
+
+import (
+	"os"
+)
+
+func runDir() (string, error) {
+	run, ok := os.LookupEnv("XDG_RUNTIME_DIR")
+	if ok {
+		return run, nil
+	}
+
+	path, err := osDependentRunDir()
+	if err != nil {
+		return "", err
+	}
+	err = os.MkdirAll(path, 0o700)
+	return path, err
+}

internal/locker/runtime_darwin.go

@@ -0,0 +1,30 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package locker
+
+import (
+	"os"
+	"path/filepath"
+)
+
+func osDependentRunDir() (string, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(home, "Library", "Application Support", "com.docker.compose"), nil
+}

internal/locker/runtime_unix.go

@@ -0,0 +1,39 @@
+//go:build linux
+
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package locker
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+)
+
+func osDependentRunDir() (string, error) {
+	run := filepath.Join("run", "user", strconv.Itoa(os.Getuid()))
+	if _, err := os.Stat(run); err == nil {
+		return run
+	}
+
+	// /run/user/$uid is set by pam_systemd, but might not be present, especially in containerized environments
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(home, ".docker", "docker-compose"), nil
+}

internal/locker/runtime_windows.go

@@ -0,0 +1,45 @@
+/*
+   Copyright 2020 Docker Compose CLI authors
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package locker
+
+import (
+	"os"
+	"path/filepath"
+
+	"golang.org/x/sys/windows"
+)
+
+func osDependentRunDir() (string, error) {
+	flags := []uint32{windows.KF_FLAG_DEFAULT, windows.KF_FLAG_DEFAULT_PATH}
+	for _, flag := range flags {
+		p, _ := windows.KnownFolderPath(windows.FOLDERID_LocalAppData, flag|windows.KF_FLAG_DONT_VERIFY)
+		if p != "" {
+			return filepath.Join(p, "docker-compose"), nil
+		}
+	}
+
+	appData, ok := os.LookupEnv("LOCALAPPDATA")
+	if ok {
+		return filepath.Join(appData, "docker-compose"), nil
+	}
+
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return "", err
+	}
+	return filepath.Join(home, "AppData", "Local", "docker-compose"), nil
+}