main: add support for CLI extensions via external binaries

This adds some logic to detect and dispatch unknown subcommands to
extensions available in `$PATH`. Additional commands can be
implemented by adding relevant `ostree-$verb` binaries to the system.

As an example, if a `/usr/bin/ostree-extcommand` extension is provided,
the execution of `ostree extcommand --help` will be dispatched to that
as `ostree-extcommand extcommand --help`.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/ostree/ot-main.h b/src/ostree/ot-main.h
index ed06e621..b369deb8 100644
--- a/src/ostree/ot-main.h
+++ b/src/ostree/ot-main.h
@@ -58,10 +58,16 @@ struct OstreeCommandInvocation {
   OstreeCommand *command;
 };
 
+int ostree_main (int argc, char **argv, OstreeCommand *commands);
+
 int ostree_run (int argc, char **argv, OstreeCommand *commands, GError **error);
 
 int ostree_usage (OstreeCommand *commands, gboolean is_error);
 
+char* ostree_command_lookup_external (int argc, char **argv, OstreeCommand *commands);
+
+int ostree_command_exec_external (char **argv);
+
 gboolean ostree_parse_sysroot_or_repo_option (GOptionContext *context,
                                               const char *sysroot_path,
                                               const char *repo_path,