Macbook Air Capture Fail

[Sebastian Roth]

@slimjim After reading through the specs and source code again and again I think I might have found out what’s wrong - seems to be a simple integer overflow.

@Tom-Elliott The variable allocation_start_block is defined as UInt32 (see here. This is fine as long as the allocation extend file is stored somewhere not that far from the beginning of the drive. But HFS+ allows to have it anywhere on disk really. In the examples posted it starts at block 3867215. Multiplied by blocksize 4096 it simply overflows the UInt32 and partclone finds wrong information.
Would you mind changing line 133 to UInt64 allocation_start_block; and build fresh init’s that have the patched partclone included? I think that should fix the issue here.

[Tom Elliott]

Init’s have been updated with the patch, as well as I fixed a compiling issue with partclone-0.2.89 in case anybody else was at all trying to build their own inits. (Sorry I fixed it manually once, and had forgotten that I had to do that. Found appropriate fix though and it is now a part of the source scripts for building the inits.)

Please give a try for them.

Init’s can be downloaded as:

wget -O /var/www/fog/service/ipxe/init.xz https://fogproject.org/inits/init.xz
wget -O /var/www/fog/service/ipxe/init_32.xz https://fogproject.org/inits/init_32.xz

Hopefully it fixes the issue you were seeing.

[Tom Elliott]

If this works, I’ll push a pull request against partclone so future versions shouldn’t hit this problem.

@Sebastian-Roth thanks for taking the time to look this over and hopefully this is the solution. If I had to guess, this was just a simple oversite on Thomas Tsai’s part.

@SlimJim Thanks for the patience and understanding on this.

[Tom Elliott]

Any word?

[SlimJim]

@tom-elliott

I’m sorry guys, school started and things got a bit hectic and therefore, I was not able to use my onsite guys to test this yet, but I will be able today.

James

[SlimJim]

@tom-elliott @Sebastian-Roth AWESOME! Looks like that worked, capture completed successfully! As always you guys have been so helpful and patient, I really appreciate you guys taking the time to assist me in my times of need!!

James

[Sebastian Roth]

@SlimJim You are welcome. Thanks to you too for patiently delivering information and waiting for results!

For now please keep those init files in place while using FOG 1.4.4. The fix will be in the next release!

[Sebastian Roth]

I also sent a pull request the the official partclone developer so hopefully this will be fixed as well.

EDIT: Done… https://github.com/Thomas-Tsai/partclone/commit/c0629e1a8e73dbdd165d7ac102b8bc9f6f44dac7