Error logs --follow if events-backend != journald, event-logger=journald

Fixes: https://github.com/containers/podman/issues/11255

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

2 files changed, 17 insertions, 6 deletions

diff --git a/libpod/container_log_linux.go b/libpod/container_log_linux.go
index 4029d0af7..324aa3b98 100644
--- a/libpod/container_log_linux.go
+++ b/libpod/container_log_linux.go
@@ -44,6 +44,12 @@ func (c *Container) initializeJournal(ctx context.Context) error {
 }
 
 func (c *Container) readFromJournal(ctx context.Context, options *logs.LogOptions, logChannel chan *logs.LogLine) error {
+	// We need the container's events in the same journal to guarantee
+	// consistency, see #10323.
+	if options.Follow && c.runtime.config.Engine.EventsLogger != "journald" {
+		return errors.Errorf("using --follow with the journald --log-driver but without the journald --events-backend (%s) is not supported", c.runtime.config.Engine.EventsLogger)
+	}
+
 	journal, err := sdjournal.NewJournal()
 	if err != nil {
 		return err
@@ -105,12 +111,6 @@ func (c *Container) readFromJournal(ctx context.Context, options *logs.LogOption
 		return errors.Wrap(cursorError, "initial journal cursor")
 	}
 
-	// We need the container's events in the same journal to guarantee
-	// consistency, see #10323.
-	if options.Follow && c.runtime.config.Engine.EventsLogger != "journald" {
-		return errors.Errorf("using --follow with the journald --log-driver but without the journald --events-backend (%s) is not supported", c.runtime.config.Engine.EventsLogger)
-	}
-
 	options.WaitGroup.Add(1)
 	go func() {
 		defer func() {
diff --git a/test/system/090-events.bats b/test/system/090-events.bats
index 1fb542ccd..5af6a3793 100644
--- a/test/system/090-events.bats
+++ b/test/system/090-events.bats
@@ -102,6 +102,17 @@ function _events_disjunctive_filters() {
     _events_disjunctive_filters --events-backend=journald
 }
 
+@test "events with file backend and journald logdriver with --follow failure" {
+    skip_if_remote "remote does not support --events-backend"
+    skip_if_journald_unavailable "system does not support journald events"
+    run_podman --events-backend=file run --log-driver=journald --name=test $IMAGE echo hi
+    is "$output" "hi" "Should support events-backend=file"
+
+    run_podman 125 --events-backend=file logs --follow test
+    is "$output" "Error: using --follow with the journald --log-driver but without the journald --events-backend (file) is not supported" "Should fail with reasonable error message when events-backend and events-logger do not match"
+
+}
+
 @test "events with disjunctive filters - default" {
     _events_disjunctive_filters ""
 }