containers.conf: add new `compose_warnings_logs` option

Emit logs on each invocation of the compose command indicating that an
external compose provider is being executed.

Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

common/docs/containers.conf.5.md

@@ -428,6 +428,11 @@ Enforce using docker.io for completing short names in Podman's compatibility
 REST API. Note that this will ignore unqualified-search-registries and
 short-name aliases defined in containers-registries.conf(5).
 
+**compose_warning_logs**=true
+
+Emit logs on each invocation of the compose command indicating that an external
+compose provider is being executed.
+
 **conmon_env_vars**=[]
 
 Environment variables to pass into Conmon.

common/pkg/config/config.go

@@ -266,6 +266,11 @@ type EngineConfig struct {
 	// in containers-registries.conf(5).
 	CompatAPIEnforceDockerHub bool `toml:"compat_api_enforce_docker_hub,omitempty"`
 
+	// ComposeWarningLogs emits logs on each invocation of the compose
+	// command indicating that an external compose provider is being
+	// executed.
+	ComposeWarningLogs bool `toml:"compose_warning_logs,omitempty"`
+
 	// DBBackend is the database backend to be used by Podman.
 	DBBackend string `toml:"database_backend,omitempty"`
 

common/pkg/config/config_local_test.go

@@ -476,6 +476,18 @@ var _ = Describe("Config Local", func() {
 		gomega.Expect(config2.Engine.CompatAPIEnforceDockerHub).To(gomega.Equal(false))
 	})
 
+	It("ComposeWarningLogs", func() {
+		// Given
+		config, err := NewConfig("")
+		gomega.Expect(err).To(gomega.BeNil())
+		gomega.Expect(config.Engine.ComposeWarningLogs).To(gomega.Equal(true))
+		// When
+		config2, err := NewConfig("testdata/containers_default.conf")
+		// Then
+		gomega.Expect(err).To(gomega.BeNil())
+		gomega.Expect(config2.Engine.ComposeWarningLogs).To(gomega.Equal(false))
+	})
+
 	It("Set machine disk", func() {
 		// Given
 		config, err := NewConfig("")

common/pkg/config/containers.conf

@@ -381,6 +381,10 @@ default_sysctls = [
 # short-name aliases defined in containers-registries.conf(5).
 #compat_api_enforce_docker_hub = true
 
+# Emit logs on each invocation of the compose command indicating that an
+# external compose provider is being executed.
+#compose_warning_logs = true
+
 # The compression format to use when pushing an image.
 # Valid options are: `gzip`, `zstd` and `zstd:chunked`.
 #

common/pkg/config/default.go

@@ -260,6 +260,7 @@ func defaultConfigFromMemory() (*EngineConfig, error) {
 	c.EventsLogFileMaxSize = eventsLogMaxSize(DefaultEventsLogSizeMax)
 
 	c.CompatAPIEnforceDockerHub = true
+	c.ComposeWarningLogs = true
 
 	if path, ok := os.LookupEnv("CONTAINERS_STORAGE_CONF"); ok {
 		if err := types.SetDefaultConfigFilePath(path); err != nil {

common/pkg/config/testdata/containers_default.conf

@@ -162,6 +162,10 @@ conmon_path = [
 # short-name aliases defined in containers-registries.conf(5).
 compat_api_enforce_docker_hub = false
 
+# Emit logs on each invocation of the compose command indicating that an
+# external compose provider is being executed.
+compose_warning_logs = false
+
 # Environment variables to be used when running the container engine (e.g., Podman, Buildah).
 # For example "http_proxy=internal.proxy.company.com".
 # Note these environment variables will not be used within the container.