Automated Sparse Image Shrinking?

[klmorin]

I have every intention of familiarize me with the writing of scripts, not only for SD. I seek references on the subject.
The option “Run Shell script after Copy” could be enabled, only when needed, without having to repeat each time the operations in Terminal.

[dnanian]

There are many books on Shell Scripting, including a number of well known ones from O'Reilly. I think there are even online versions of those books that can be accessed, perhaps even for free...

[klmorin]

I start to work immediately...

[klmorin]

Eureka!

I do not know, Dave, if you will approve?

Here is an AppleScript which I make run by SD via the option “Run Shell after Copy complete”
We can enable the option as need or leave it always enabled.

---------------------------
tell application "Finder" to eject disk "MyBackup"
-- wait for it
repeat until (list disks) does not contain "MyBackup"
delay 2
end repeat
delay 30
set diskImage to POSIX path of "/Volumes/MyDisk/BackupFolder/MyBackup.sparseimage"
do shell script "/usr/bin/hdiutil compact " & quoted form of diskImage
----------------------------

I used AppleScript editor to write and compile this script and I saved it as application (Compact.app) in Saved Setting. Obviously, if there are several scenarios of backups, each one must have its own adapted script.

[dnanian]

Well... there can definitely be issues there, because SD! doesn't expect the volume to vanish during the "After" script...

[klmorin]

However, i certify that this script works perfectly. I tested it.

It ejects volume “MyBackup” and thus releases the image disc “MyBackup.sparseimage”.
The operation hdiutil compact can then be carried out.

And SuperDuper! finish its operations all gently, normally, as it should be.
No problem, no message of error.

I admit not too well understand how the last instruction “unmount MyBackup” can be carried out, but it's done. I'm merely stating a fact.

[dnanian]

Oh, I believe you: I'm just saying that we don't expect that script to eject the image, so I can't guarantee it'll continue working...