cmd: shim and init into separate binaries

This change also fixes a deadlock when shim fails to connect and complete the setup.

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

internal/path.go

@@ -0,0 +1,14 @@
+package internal
+
+import "path"
+
+var (
+	Fmain = compPoison
+	Fsu   = compPoison
+	Fshim = compPoison
+	Finit = compPoison
+)
+
+func Path(p string) (string, bool) {
+	return p, p != compPoison && p != "" && path.IsAbs(p)
+}