create common entry point for Rust commands

The bcachefs sub-commands that are implemented in Rust (completions,
list, and mount) had separate entrypoints and thus had some differences
in behavior.

This introduces a common entry point for the Rust sub-commands. This
reduces duplicate boilerplate code like parsing argv and setting up
logging, and will facilitate converting more sub-commands to Rust in
the future.

An immediate benefit is that this fixes an issue with `bcachefs list`
not reporting errors:

before:

$ bcachefs list /dev/typo
$ echo $?
0

after:

$ bcachefs list /dev/typo
ERROR - bcachefs_rust::cmd_list: Fatal error: "No such file or directory"
$ echo $?
1

Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

1 files changed, 1 insertions, 0 deletions

diff --git a/rust-src/src/lib.rs b/rust-src/src/lib.rs
index 64297b41..026cca49 100644
--- a/rust-src/src/lib.rs
+++ b/rust-src/src/lib.rs
@@ -2,6 +2,7 @@ use clap::Subcommand;
 
 pub mod key;
 pub mod logger;
+pub mod cmd_main;
 pub mod cmd_mount;
 pub mod cmd_list;
 pub mod cmd_completions;