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)
+)