container: use absolute for pathname

This is simultaneously more efficient and less error-prone. This change caused minor API changes in multiple other packages.

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

ldd/exec.go

@@ -33,14 +33,17 @@ func Exec(ctx context.Context, p string) ([]*Entry, error) {
 		return nil, err
 	}
 
-	z := container.NewCommand(c, toolPath.String(), lddName, p)
+	z := container.NewCommand(c, toolPath, lddName, p)
 	z.Hostname = "hakurei-" + lddName
 	z.SeccompFlags |= seccomp.AllowMultiarch
 	z.SeccompPresets |= seccomp.PresetStrict
 	stdout, stderr := new(bytes.Buffer), new(bytes.Buffer)
 	z.Stdout = stdout
 	z.Stderr = stderr
-	z.Bind(container.FHSRoot, container.FHSRoot, 0).Proc(container.FHSProc).Dev(container.FHSProc, false)
+	z.
+		Bind(container.AbsFHSRoot, container.AbsFHSRoot, 0).
+		Proc(container.AbsFHSProc).
+		Dev(container.AbsFHSDev, false)
 
 	if err := z.Start(); err != nil {
 		return nil, err