yum-presto behaviour on arm

Andy Green andy at warmcat.com
Wed Dec 16 14:06:24 UTC 2009

Hi -

Is yum-presto known to work on arm?  Today I changed our repo to use 
deltarpms and tested it out.  I noticed...

1) On a package where I know the bulk of the unpacked data is some fonts 
inside an ELF executable that didn't change, the compression result 
was... not good

   Old RPM:  25424385 txtr-reader-0.1-417.fc11.armv5tel.rpm
   New RPM:  25465487 txtr-reader-0.1-420.fc11.armv5tel.rpm
Delta RPM:  25465402 txtr-reader-0.1-417.fc11_0.1-420.fc11.armv5tel.drpm

So it saved me 85 bytes from 25MByte :-)

The actual procedure here is the createrepo is run on an x86_64 box over 
these arm packages and then rsync'd on a server.

2) Using deltarpms fails

Loaded plugins: presto
Setting up Update Process
Resolving Dependencies
There are unfinished transactions remaining. You might consider running 
yum-complete-transaction first to finish them.
--> Running transaction check
---> Package txtr-reader.armv5tel 0:0.1-420.fc11 set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

  Package            Arch            Version             Repository 
  txtr-reader        armv5tel        0.1-420.fc11        txtradevel 
     24 M

Transaction Summary
Install      0 Package(s)
Update       1 Package(s)
Remove       0 Package(s)

Total download size: 24 M
Downloading Packages:
Setting up and reading Presto delta metadata
Downloading DeltaRPMs:
Rebuilding rpms from deltarpms
md5 mismatch of result
Error rebuilding rpm from 
txtr-reader-0.1-417.fc11_0.1-420.fc11.armv5tel.drpm! Will download full 
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
   Updating       : txtr-reader 
   Cleanup        : txtr-reader 

   txtr-reader.armv5tel 0:0.1-420.fc11 


Any advice welcomed, it would be great to reduce this 25MByte package 
down since the vast bulk of it is exactly the same each time :-)


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