fhs: move from container

This package is not container-specific.

Signed-off-by: Ophestra <cat@gensokyo.uk>

fhs/abs.go

@@ -0,0 +1,49 @@
+package fhs
+
+import (
+	_ "unsafe" // for go:linkname
+
+	"hakurei.app/check"
+)
+
+/* constants in this file bypass abs check, be extremely careful when changing them! */
+
+// unsafeAbs returns check.Absolute on any string value.
+//
+//go:linkname unsafeAbs hakurei.app/check.unsafeAbs
+func unsafeAbs(pathname string) *check.Absolute
+
+var (
+	// AbsRoot is [Root] as [check.Absolute].
+	AbsRoot = unsafeAbs(Root)
+	// AbsEtc is [Etc] as [check.Absolute].
+	AbsEtc = unsafeAbs(Etc)
+	// AbsTmp is [Tmp] as [check.Absolute].
+	AbsTmp = unsafeAbs(Tmp)
+
+	// AbsRun is [Run] as [check.Absolute].
+	AbsRun = unsafeAbs(Run)
+	// AbsRunUser is [RunUser] as [check.Absolute].
+	AbsRunUser = unsafeAbs(RunUser)
+
+	// AbsUsr is [Usr] as [check.Absolute].
+	AbsUsr = unsafeAbs(Usr)
+	// AbsUsrBin is [UsrBin] as [check.Absolute].
+	AbsUsrBin = unsafeAbs(UsrBin)
+
+	// AbsVar is [Var] as [check.Absolute].
+	AbsVar = unsafeAbs(Var)
+	// AbsVarLib is [VarLib] as [check.Absolute].
+	AbsVarLib = unsafeAbs(VarLib)
+
+	// AbsDev is [Dev] as [check.Absolute].
+	AbsDev = unsafeAbs(Dev)
+	// AbsDevShm is [DevShm] as [check.Absolute].
+	AbsDevShm = unsafeAbs(DevShm)
+	// AbsProc is [Proc] as [check.Absolute].
+	AbsProc = unsafeAbs(Proc)
+	// AbsProcSelfExe is [ProcSelfExe] as [check.Absolute].
+	AbsProcSelfExe = unsafeAbs(ProcSelfExe)
+	// AbsSys is [Sys] as [check.Absolute].
+	AbsSys = unsafeAbs(Sys)
+)

fhs/fhs.go

@@ -0,0 +1,51 @@
+// Package fhs provides constant and checked pathname values for common FHS paths.
+package fhs
+
+const (
+	// Root points to the file system root.
+	Root = "/"
+	// Etc points to the directory for system-specific configuration.
+	Etc = "/etc/"
+	// Tmp points to the place for small temporary files.
+	Tmp = "/tmp/"
+
+	// Run points to a "tmpfs" file system for system packages to place runtime
+	// data, socket files, and similar.
+	Run = "/run/"
+	// RunUser points to a directory containing per-user runtime directories,
+	// each usually individually mounted "tmpfs" instances.
+	RunUser = Run + "user/"
+
+	// Usr points to vendor-supplied operating system resources.
+	Usr = "/usr/"
+	// UsrBin points to binaries and executables for user commands that shall
+	// appear in the $PATH search path.
+	UsrBin = Usr + "bin/"
+
+	// Var points to persistent, variable system data. Writable during normal
+	// system operation.
+	Var = "/var/"
+	// VarLib points to persistent system data.
+	VarLib = Var + "lib/"
+	// VarEmpty points to a nonstandard directory that is usually empty.
+	VarEmpty = Var + "empty/"
+
+	// Dev points to the root directory for device nodes.
+	Dev = "/dev/"
+	// DevShm is the place for POSIX shared memory segments, as created via
+	// shm_open(3).
+	DevShm = "/dev/shm/"
+	// Proc points to a virtual kernel file system exposing the process list and
+	// other functionality.
+	Proc = "/proc/"
+	// ProcSys points to a hierarchy below /proc/ that exposes a number of
+	// kernel tunables.
+	ProcSys = Proc + "sys/"
+	// ProcSelf resolves to the process's own /proc/pid directory.
+	ProcSelf = Proc + "self/"
+	// ProcSelfExe is a symbolic link to program pathname.
+	ProcSelfExe = ProcSelf + "exe"
+	// Sys points to a virtual kernel file system exposing discovered devices
+	// and other functionality.
+	Sys = "/sys/"
+)