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app_unix.go
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app_unix.go
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// Copyright 2020-2023 Buf Technologies, Inc.
//
// 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.
// Matching the unix-like build tags in the Golang source i.e. https://github.com/golang/go/blob/912f0750472dd4f674b69ca1616bfaf377af1805/src/os/file_unix.go#L6
//
// We expanded this to all unix-like platforms, including those we don't support, as most
// of this should work without issue, and there are bigger problems with supporting i.e. js,wasm
// that are outside the scope of these build tags. Being able to build buf on i.e. openbsd
// was a blocker, see https://github.com/bufbuild/buf/issues/362 and the linked discussions.
// We still only officially support linux and darwin for buf as a whole.
//go:build aix || darwin || dragonfly || freebsd || (js && wasm) || linux || netbsd || openbsd || solaris
// +build aix darwin dragonfly freebsd js,wasm linux netbsd openbsd solaris
package app
import (
"errors"
"fmt"
"path/filepath"
)
const (
// DevStdinFilePath is the equivalent of /dev/stdin.
//
// This will be /dev/stdin for darwin and linux.
// This does not exist for windows.
DevStdinFilePath = "/dev/stdin"
// DevStdoutFilePath is the equivalent of /dev/stdout.
//
// This will be /dev/stdout for darwin and linux.
// This does not exist for windows.
DevStdoutFilePath = "/dev/stdout"
// DevStderrFilePath is the equivalent of /dev/stderr.
//
// This will be /dev/stderr for darwin and linux.
// This does not exist for windows.
DevStderrFilePath = "/dev/stderr"
// DevNullFilePath is the equivalent of /dev/null.
//
// This will be /dev/null for darwin and linux.
// This will be nul for windows.
DevNullFilePath = "/dev/null"
)
// HomeDirPath returns the home directory path.
//
// This will be $HOME for darwin and linux.
// This will be %USERPROFILE% for windows.
func HomeDirPath(envContainer EnvContainer) (string, error) {
if home := envContainer.Env("HOME"); home != "" {
return home, nil
}
return "", errors.New("$HOME is not set")
}
// CacheDirPath returns the cache directory path.
//
// This will be $XDG_CACHE_HOME for darwin and linux, falling back to $HOME/.cache.
// This will be %LocalAppData% for windows.
//
// See https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
// for darwin and linux. Note that we use the same for darwin and linux as this is
// what developers expect, as opposed to ~/Library/Preferences etc as the stdlib
// does for Go.
//
// Users cannot assume that CacheDirPath, ConfigDirPath, and DataDirPath are unique.
func CacheDirPath(envContainer EnvContainer) (string, error) {
return xdgDirPath(envContainer, "XDG_CACHE_HOME", ".cache")
}
// ConfigDirPath returns the config directory path.
//
// This will be $XDG_CONFIG_HOME for darwin and linux, falling back to $HOME/.config.
// This will be %AppData% for windows.
//
// See https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
// for darwin and linux. Note that we use the same for darwin and linux as this is
// what developers expect, as opposed to ~/Library/Preferences etc as the stdlib
// does for Go.
//
// Users cannot assume that CacheDirPath, ConfigDirPath, and DataDirPath are unique.
func ConfigDirPath(envContainer EnvContainer) (string, error) {
return xdgDirPath(envContainer, "XDG_CONFIG_HOME", ".config")
}
// DataDirPath returns the data directory path.
//
// This will be $XDG_DATA_HOME for darwin and linux, falling back to $HOME/.local/share.
// This will be %LocalAppData% for windows.
//
// See https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html
// for darwin and linux. Note that we use the same for darwin and linux as this is
// what developers expect, as opposed to ~/Library/Preferences etc as the stdlib
// does for Go.
//
// Users cannot assume that CacheDirPath, ConfigDirPath, and DataDirPath are unique.
func DataDirPath(envContainer EnvContainer) (string, error) {
return xdgDirPath(envContainer, "XDG_DATA_HOME", filepath.Join(".local", "share"))
}
func xdgDirPath(envContainer EnvContainer, key string, fallbackRelHomeDirPath string) (string, error) {
if value := envContainer.Env(key); value != "" {
return value, nil
}
if home := envContainer.Env("HOME"); home != "" {
return filepath.Join(home, fallbackRelHomeDirPath), nil
}
return "", fmt.Errorf("$%s and $HOME are not set", key)
}