fix: honor configured Docker registration file (#1259)

The Docker entrypoint always checked `.runner` in `/data` and ignored `runner.file` from `CONFIG_FILE`. When `runner.file` pointed elsewhere, it re-registered on every start, or skipped registration because of a stale `.runner`. It now reads the path from a new `config runner-file` subcommand, which resolves `runner.file` the same way as `register` and `daemon`.

Closes https://gitea.com/gitea/runner/issues/585

---------

Co-authored-by: silverwind <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1259
Reviewed-by: silverwind <[email protected]>

internal/app/cmd/config.go

@@ -27,6 +27,19 @@ func loadConfigCmd(configFile *string) *cobra.Command {
 
 	configCmd.AddCommand(loadGenerateConfigCmd("generate"))
 	configCmd.AddCommand(loadInitConfigCmd(configFile))
+	configCmd.AddCommand(&cobra.Command{
+		Use:   "runner-file",
+		Short: "Print the registration file path used by the runner",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, _ []string) error {
+			cfg, err := config.LoadDefault(*configFile)
+			if err != nil {
+				return err
+			}
+			fmt.Fprintln(cmd.OutOrStdout(), cfg.Runner.File)
+			return nil
+		},
+	})
 
 	configCmd.AddCommand(&cobra.Command{
 		Use:   "get <key>",

internal/app/cmd/config_test.go

@@ -97,3 +97,14 @@ func TestConfigCmdResolvesTheConfigFile(t *testing.T) {
 		assert.Contains(t, err.Error(), "--config")
 	})
 }
+
+func TestConfigCmdRunnerFileUsesConfiguredPathOrDefault(t *testing.T) {
+	out, _, err := runConfigCmd(t, "", "runner-file")
+	require.NoError(t, err)
+	assert.Equal(t, ".runner\n", out)
+	file := filepath.Join(t.TempDir(), "config.yaml")
+	require.NoError(t, os.WriteFile(file, []byte("runner:\n  file: 'state dir/registration.json'\n"), 0o600))
+	out, _, err = runConfigCmd(t, file, "runner-file")
+	require.NoError(t, err)
+	assert.Equal(t, "state dir/registration.json\n", out)
+}

scripts/run.sh

@@ -6,12 +6,11 @@ fi
 
 cd /data
 
-RUNNER_STATE_FILE=${RUNNER_STATE_FILE:-'.runner'}
-
 CONFIG_ARG=""
 if [[ ! -z "${CONFIG_FILE}" ]]; then
   CONFIG_ARG="--config ${CONFIG_FILE}"
 fi
+RUNNER_STATE_FILE=${RUNNER_STATE_FILE:-$(gitea-runner ${CONFIG_ARG} config runner-file)}
 LABEL_ARGS=""
 if [[ ! -z "${GITEA_RUNNER_LABELS}" ]]; then
   LABEL_ARGS="--labels ${GITEA_RUNNER_LABELS}"