Keeping a SMB share mounted on macOS (version 2)

May 16, 2024 • Tagged: macos samba launchd

For context and background information, see my original post on keeping an SMB share mounted and alerting when it does down.

Since my first post on this topic, I’ve iterated on the SMB mount maintenance script; in particular, it now gracefully handles the case where macOS decides that “this time, for no particular reason, I’m going to mount this at /Volumes/general-1 instead of /Volumes/general.”

This maintenance script is the only thing that’s changed, so check out the original post for instructions on initial setup for the mount and the launchd job.

~/code/maintain-general-smb-mount.sh:

#!/usr/bin/env bash
set -u

do_mount() {
	if osascript -e 'mount volume "smb://cdzombak@jetstream.dzhome/general"'; then
		exit 0
	else
		exit 1
	fi
}

MOUNT_DIR=$(mount | grep 'cdzombak@jetstream.dzhome/general' | cut -d' ' -f3)
if [ -z "$MOUNT_DIR" ]; then do_mount; fi
[ -d "$MOUNT_DIR" ] || exit 1
[ -f "$MOUNT_DIR"/.liveness.txt ] || exit 1

This updated script:

Checks whether the mount exists. If so, it gets the mount’s path (in /Volumes). If not, it attempts to mount the volume.
Checks that the mount’s path exists and that the file .liveness.txt exists in it. If not, it exits with an error (indicating that Uptime Kuma should notify me about the problem).