Courgette vs. deltarpm comparison

I keep on getting questions about deltarpm using the courgette algorithm, so I thought I would temporarily put them to rest:

firefox-3.5.4-1.fc12.i686.rpm – 15M
firefox-3.5.6-1.fc12.i686.rpm – 15M
firefox-3.5.4-1.fc12_3.5.6-1.fc12.i686.drpm (rpm-only deltaprm) – 434K
firefox-3.5.4-1.fc12_3.5.6-1.fc12.i686.courgette.bz2 (delta of rpm cpios) – 426K

Please note that this is *not* a reflection of how courgette would work if it could use its disassembly algorithm on Linux binaries. The problem is that the disassembly algorithm only works with Windows binaries right now. Until courgette is able to do its disassembly-foo on Linux binaries, there will be no real benefit to using courgette in deltarpm.

For deltarpm:
$makedeltarpm -r firefox-3.5.4-1.fc12.i686.rpm \
firefox-3.5.6-1.fc12.i686.rpm \

For courgette:
$ rpm2cpio firefox-3.5.4-1.fc12.i686.rpm > \
$ rpm2cpio firefox-3.5.6-1.fc12.i686.rpm > \
$ courgette -gen firefox-3.5.4-1.fc12.i686.cpio \
firefox-3.5.6-1.fc12.i686.cpio \
$ bzip2 firefox-3.5.4-1.fc12_3.5.6-1.fc12.i686.courgette

Note: I believe the 8K difference in file size is because the courgette delta doesn’t contain any of the rpm metadata.


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s