[TOML ConfigSource] add support for executing fallback CLI commands

Signed-off-by: Tariq Ibrahim <tibrahim@nvidia.com>
Co-authored-by: Evan Lezar <elezar@nvidia.com>

pkg/config/engine/containerd/containerd.go

@@ -128,8 +128,7 @@ func (c *Config) GetRuntimeConfig(name string) (engine.RuntimeConfig, error) {
 
 // CommandLineSource returns the CLI-based containerd config loader
 func CommandLineSource(hostRoot string) toml.Loader {
-	commandLine := chrootIfRequired(hostRoot, "containerd", "config", "dump")
+	return toml.FromCommandLine(chrootIfRequired(hostRoot, "containerd", "config", "dump")...)
-	return toml.FromCommandLine(commandLine[0], commandLine[1:]...)
 }
 
 func chrootIfRequired(hostRoot string, commandLine ...string) []string {

pkg/config/engine/crio/crio.go

@@ -155,8 +155,10 @@ func (c *Config) GetRuntimeConfig(name string) (engine.RuntimeConfig, error) {
 
 // CommandLineSource returns the CLI-based crio config loader
 func CommandLineSource(hostRoot string) toml.Loader {
-	commandLine := chrootIfRequired(hostRoot, "crio", "status", "config")
+	return toml.LoadFirst(
-	return toml.FromCommandLine(commandLine[0], commandLine[1:]...)
+		toml.FromCommandLine(chrootIfRequired(hostRoot, "crio", "status", "config")...),
+		toml.FromCommandLine(chrootIfRequired(hostRoot, "crio-status", "config")...),
+	)
 }
 
 func chrootIfRequired(hostRoot string, commandLine ...string) []string {

pkg/config/toml/list.go

@@ -0,0 +1,41 @@
+/**
+# Copyright 2024 NVIDIA CORPORATION
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package toml
+
+import "errors"
+
+type firstOf []Loader
+
+func LoadFirst(loaders ...Loader) Loader {
+	return firstOf(loaders)
+}
+
+func (loaders firstOf) Load() (*Tree, error) {
+	var errs error
+	for _, loader := range loaders {
+		if loader == nil {
+			continue
+		}
+		tree, err := loader.Load()
+		if err != nil {
+			errs = errors.Join(errs, err)
+			continue
+		}
+		return tree, nil
+	}
+	return nil, errs
+}

pkg/config/toml/source.go

@@ -36,12 +36,12 @@ func FromFile(path string) Loader {
 
 // FromCommandLine creates a TOML source from the output of a shell command and its corresponding args.
 // If the command is empty, an empty config is returned.
-func FromCommandLine(cmd string, args ...string) Loader {
+func FromCommandLine(cmds ...string) Loader {
-	if len(cmd) == 0 {
+	if len(cmds) == 0 {
 		return Empty
 	}
 	return &tomlCliSource{
-		command: cmd,
+		command: cmds[0],
-		args:    args,
+		args:    cmds[1:],
 	}
 }