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// Package sys wraps OS interaction library functions.
package sys
import (
"io/fs"
"os/user"
"path"
"strconv"
"git.gensokyo.uk/security/hakurei/hst"
"git.gensokyo.uk/security/hakurei/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 [proc.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 [fmsg.BaseError].
Uid(aid int) (int, error)
}
// CopyPaths is a generic implementation of [hst.Paths].
func CopyPaths(os State, v *hst.Paths) {
v.SharePath = path.Join(os.TempDir(), "hakurei."+strconv.Itoa(os.Getuid()))
hlog.Verbosef("process share directory at %q", v.SharePath)
if r, ok := os.LookupEnv(xdgRuntimeDir); !ok || r == "" || !path.IsAbs(r) {
// fall back to path in share since hakurei has no hard XDG dependency
v.RunDirPath = path.Join(v.SharePath, "run")
v.RuntimePath = path.Join(v.RunDirPath, "compat")
} else {
v.RuntimePath = r
v.RunDirPath = path.Join(v.RuntimePath, "hakurei")
}
hlog.Verbosef("runtime directory at %q", v.RunDirPath)
}
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