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// Package sys wraps OS interaction library functions.
package sys
import (
"io/fs"
"log"
"os/user"
"strconv"
"hakurei.app/container"
"hakurei.app/hst"
"hakurei.app/internal/hlog"
)
// State provides safe interaction with operating system state.
type State interface {
// Getuid provides [os.Getuid].
Getuid() int
// Getgid provides [os.Getgid].
Getgid() int
// LookupEnv provides [os.LookupEnv].
LookupEnv(key string) (string, bool)
// TempDir provides [os.TempDir].
TempDir() string
// LookPath provides exec.LookPath.
LookPath(file string) (string, error)
// MustExecutable provides [container.MustExecutable].
MustExecutable() string
// LookupGroup provides [user.LookupGroup].
LookupGroup(name string) (*user.Group, error)
// ReadDir provides [os.ReadDir].
ReadDir(name string) ([]fs.DirEntry, error)
// Stat provides [os.Stat].
Stat(name string) (fs.FileInfo, error)
// Open provides [os.Open].
Open(name string) (fs.File, error)
// EvalSymlinks provides filepath.EvalSymlinks.
EvalSymlinks(path string) (string, error)
// Exit provides [os.Exit].
Exit(code int)
Println(v ...any)
Printf(format string, v ...any)
// Paths returns a populated [hst.Paths] struct.
Paths() hst.Paths
// Uid invokes hsu and returns target uid.
// Any errors returned by Uid is already wrapped [hlog.BaseError].
Uid(identity int) (int, error)
}
// MustGetUserID obtains user id from hsu by querying uid of identity 0.
func MustGetUserID(os State) int { return (MustUid(os, 0) / 10000) - 100 }
// CopyPaths is a generic implementation of [hst.Paths].
func CopyPaths(os State, v *hst.Paths, userid int) {
if tempDir, err := container.NewAbs(os.TempDir()); err != nil {
log.Fatalf("invalid TMPDIR: %v", err)
} else {
v.TempDir = tempDir
}
v.SharePath = v.TempDir.Append("hakurei." + strconv.Itoa(userid))
hlog.Verbosef("process share directory at %q", v.SharePath)
r, _ := os.LookupEnv(xdgRuntimeDir)
if a, err := container.NewAbs(r); err != nil {
// fall back to path in share since hakurei has no hard XDG dependency
v.RunDirPath = v.SharePath.Append("run")
v.RuntimePath = v.RunDirPath.Append("compat")
} else {
v.RuntimePath = a
v.RunDirPath = v.RuntimePath.Append("hakurei")
}
hlog.Verbosef("runtime directory at %q", v.RunDirPath)
}
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