lang: core: deploy: Add a function to help in obtaining bootstrap deps

This should make it easier to implement handoff.

lang/core/deploy/bootstrap_packages_func.go

@@ -0,0 +1,58 @@
+// Mgmt
+// Copyright (C) 2013-2024+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+// Additional permission under GNU GPL version 3 section 7
+//
+// If you modify this program, or any covered work, by linking or combining it
+// with embedded mcl code and modules (and that the embedded mcl code and
+// modules which link with this program, contain a copy of their source code in
+// the authoritative form) containing parts covered by the terms of any other
+// license, the licensors of this program grant you additional permission to
+// convey the resulting work. Furthermore, the licensors of this program grant
+// the original author, James Shubin, additional permission to update this
+// additional permission if he deems it necessary to achieve the goals of this
+// additional permission.
+
+package coredeploy
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/purpleidea/mgmt/lang/funcs/simple"
+	"github.com/purpleidea/mgmt/lang/types"
+	distroUtil "github.com/purpleidea/mgmt/util/distro"
+)
+
+func init() {
+	simple.ModuleRegister(ModuleName, "bootstrap_packages", &simple.Scaffold{
+		T: types.NewType("func(str) []str"),
+		F: BootstrapPackages,
+	})
+}
+
+// BootstrapPackages returns the list of packages corresponding to the distro
+// for bootstrapping new machines which will need these installed before they
+// can run mgmt.
+func BootstrapPackages(ctx context.Context, input []types.Value) (types.Value, error) {
+	packages, exists := distroUtil.DistroToBootstrapPackages(input[0].Str())
+	if !exists {
+		return nil, fmt.Errorf("missing distro")
+	}
+
+	return types.ListStrToValue(packages), nil
+}