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// Package env provides the [Paths] struct for efficiently building paths from
// the environment.
package env
import (
"errors"
"io/fs"
"log"
"os"
"strconv"
"hakurei.app/check"
"hakurei.app/fhs"
"hakurei.app/hst"
)
const VarRunNscd = fhs.Var + "run/nscd"
// Paths holds paths copied from the environment and is used to create [hst.Paths].
type Paths struct {
// TempDir is returned by [os.TempDir].
TempDir *check.Absolute
// RuntimePath is copied from $XDG_RUNTIME_DIR.
RuntimePath *check.Absolute
// Whether [VarRunNscd] is a directory.
HasNscd bool
}
// Copy expands [Paths] into [hst.Paths].
func (env *Paths) Copy(v *hst.Paths, userid int) {
if env == nil || env.TempDir == nil || v == nil {
panic("attempting to use an invalid Paths")
}
v.TempDir = env.TempDir
v.SharePath = env.TempDir.Append("hakurei." + strconv.Itoa(userid))
if env.RuntimePath == nil {
// fall back to path in share since hakurei has no hard XDG dependency
v.RuntimePath = v.SharePath.Append("compat")
} else {
v.RuntimePath = env.RuntimePath
}
v.RunDirPath = v.RuntimePath.Append("hakurei")
}
// CopyPaths returns a populated [Paths].
func CopyPaths() *Paths {
return CopyPathsFunc(log.Fatalf, os.TempDir, os.Getenv, os.Stat)
}
// CopyPathsFunc returns a populated [Paths], using the provided [log.Fatalf],
// [os.TempDir], [os.Getenv] functions.
func CopyPathsFunc(
fatalf func(format string, v ...any),
tempdir func() string,
getenv func(key string) string,
stat func(name string) (fs.FileInfo, error),
) *Paths {
const xdgRuntimeDir = "XDG_RUNTIME_DIR"
var env Paths
if tempDir, err := check.NewAbs(tempdir()); err != nil {
fatalf("invalid TMPDIR: %v", err)
panic("unreachable")
} else {
env.TempDir = tempDir
}
if a, err := check.NewAbs(getenv(xdgRuntimeDir)); err == nil {
env.RuntimePath = a
}
if fi, err := stat(VarRunNscd); err != nil {
if !errors.Is(err, fs.ErrNotExist) {
fatalf("%v", err)
panic("unreachable")
}
} else {
env.HasNscd = fi.IsDir()
}
return &env
}
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