internal/rosa/package: migrate make

This also introduces the generic helper for unusual build scripts.

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

internal/rosa/rosa.go

@@ -544,6 +544,56 @@ cd '/usr/src/` + name + `/'
 	)
 }
 
+// GenericHelper directly passes build script segments for invocations of
+// one-off build scripts too specific to fit into any other [Helper]
+// implementation, but can still benefit from [Toolchain.NewPackage].
+type GenericHelper struct {
+	// Whether to create and enter a directory in TMPDIR.
+	EnterTemp bool
+
+	// Concatenated for [Toolchain].
+	Build, Check, Install string
+}
+
+var _ Helper = new(GenericHelper)
+
+// extra is a noop.
+func (*GenericHelper) extra(int) P { return nil }
+
+// wantsChmod returns false.
+func (*GenericHelper) wantsChmod() bool { return false }
+
+// wantsWrite returns false.
+func (*GenericHelper) wantsWrite() bool { return false }
+
+// scriptEarly returns the zero value.
+func (*GenericHelper) scriptEarly() string { return "" }
+
+// createDir returns false.
+func (*GenericHelper) createDir() bool { return false }
+
+// wantsDir requests a new directory in TMPDIR, or the source directory otherwise.
+func (attr *GenericHelper) wantsDir() string {
+	if attr != nil && attr.EnterTemp {
+		return `"$(mktemp -d)"`
+	}
+	return ""
+}
+
+// script concatenates specified segments.
+func (attr *GenericHelper) script(t Toolchain, _ string) string {
+	if attr == nil {
+		attr = new(GenericHelper)
+	}
+
+	script := attr.Build
+	if t.opts&OptSkipCheck == 0 {
+		script += attr.Check
+	}
+	script += attr.Install
+	return script
+}
+
 const (
 	// jobsE is expression for preferred job count set by [pkg].
 	jobsE = `"$` + pkg.EnvJobs + `"`