mount: print a helpful error message

Just returning a failure exit status makes it hard to tell what the
actual issue was. Instead, the mount command now also provides some
textual output.

See https://github.com/koverstreet/bcachefs-tools/issues/308 for an
example where mount does not provide any helpful output, even with
BCACHEFS_LOG=trace enabled.

Signed-off-by: Florian Schmaus <flo@geekplace.eu>

1 files changed, 5 insertions, 2 deletions

diff --git a/src/commands/mount.rs b/src/commands/mount.rs
index fe69bf57..5bda4075 100644
--- a/src/commands/mount.rs
+++ b/src/commands/mount.rs
@@ -10,7 +10,7 @@ use std::{
 use anyhow::{ensure, Result};
 use bch_bindgen::{bcachefs, bcachefs::bch_sb_handle, opt_set, path_to_cstr};
 use clap::Parser;
-use log::{debug, info};
+use log::{debug, error, info};
 use uuid::Uuid;
 
 use crate::{
@@ -385,6 +385,9 @@ pub fn mount(mut argv: Vec<String>, symlink_cmd: Option<&str>) -> std::process::
 
     match cmd_mount_inner(&cli) {
         Ok(_)   => std::process::ExitCode::SUCCESS,
-        Err(_)   => std::process::ExitCode::FAILURE,
+        Err(e)   => {
+            error!("Mount failed: {e}");
+            std::process::ExitCode::FAILURE
+        }
     }
 }