How to unmount a drive with a script

bashscriptsleep-wake

I installed sleepwatcher to run ~/.sleep before my computer goes to sleep.

I need to unmount /Volumes/Backup before my computer falls asleep. If I forget to do it, I get a message telling me that I unsafely unmounted the drive, etc. when the computer resumes. It's a rare external Seagate drive glitch. Lucky me.

So I am trying to remedy the problem with Sleepwatcher by unmounting the drive before the system sleeps. Obviously sudo and the password it requires is standing in my way.

Any ideas?

I can't use the echo "password" | sudo -S xx xx method because my password contains a dollar ($) sign, So I need another form of injection.

If I remove the password requirement from /etc/sudoers, the system becomes very insecure.

So any creative ideas?

Best Answer

You don't need sudo to unmount a drive.

Use `diskutil`

The following command ejects the volume Backup:

diskutil eject /Volumes/Backup

This should do it, although (IIRC) you might want…

diskutil unmount /Volumes/Backup

…to make it easier to re-mount without having to physically disconnect/reconnect the drive.

Ejecting All Disks

If you want to make sure you have ejected all of your disks, you can try this:

osascript -e 'tell application "Finder" to eject (every disk whose ejectable is true)'

Third Party Tool: Mountain

There is also Mountain which will automate this for you.

Third Party Tool: Keyboard Maestro

Above all other ideas, I would recommend Keyboard Maestro which can do all of these things on sleep, and remount your drive on wake, plus 1,000 other things.

Related Solutions

MacOS – Bash script to run command with prompt for input

In your script you can put :

echo "Input subnet"
read subnet

to get user input and store it in a variable called subnet.

Obviously there is no check to see if you entered a valid subnet.

Shell script help

This should work. I don't have time currently to explain the changes/additions, but I'll update. You must run this script as sudo for it to work.

Even easier, sudo chmod +s yourscript - will run as root without requiring password.

#!/bin/bash

#Machines must have cURL installed as a prerequisite to download software from internet or FTP server 

#Change to your working directory. 
cd ~/Downloads

#grab files from www.teamviewer.com or custom FTP server
curl -O http://downloadus3.teamviewer.com/download/TeamViewerHost.dmg

#grab TeamViewer from custom FTP server
curl -O https://www.dropbox.com/s/******/com.apple.TeamViewer8.Settings.plist

#Place customized plist file into Library/Preferences
mv ~/Downloads/com.apple.TeamViewer8.Settings.plist /Library/Preferences/

#Mount and Install TeamViewer
hdiutil mount ~/Downloads/TeamViewerHost.dmg
installer -pkg /Volumes/TeamViewerHost/Install\ TeamViewerHost.pkg -target LocalSystem

#Softkill process in order to unmount package
ps aux | grep -i TeamViewer | awk {'print $2'} | xargs kill

#Unmount package
hdiutil unmount /Volumes/TeamViewerHost/