Bug 564222 – sys-apps/portage: make vdb_metadata.pickle validation handle truncated mtime (useful for livecd squashfs)

• Product: Portage Development
• Status: RESOLVED FIXED

[Description Zac Medico 2015-10-26 22:40:51 UTC]

Currently, if emerge is invoked on a squashfs based livecd, it will spend a lot of time to regenerate the entire vdb_metadata.pickle. This is due to truncation of timestamps to 1s precision. If the vdb_metadata.pickle code would detect this truncation, then it could treat the cache as valid, and avoid regenerating it.

[Comment 1 Zac Medico 2015-10-26 23:34:04 UTC]

There's a patch in the following branch:

https://github.com/zmedico/portage/tree/bug_564222

[Comment 2 Zac Medico 2015-10-27 04:10:03 UTC]

The first version of the patch had incorrect logic. It's fixed now. Here's a link to the current patch:

https://github.com/zmedico/portage/commit/ca8505cf52354c0ac3b1feb1900dc034658072b0.patch

[Comment 3 Zac Medico 2015-10-28 02:00:40 UTC]

I've posted the patch for review here:

https://archives.gentoo.org/gentoo-portage-dev/message/3c7fa054f5af9d8399c03e08d049f6e0

[Comment 4 Rick Farina (Zero_Chaos) 2015-10-28 03:26:43 UTC]

I gave report on irc but I'll add it here as well.  This patch speed up the initial run of emerge on my livecd by EIGHT minutes.  Please accept it.

[Comment 5 Rick Farina (Zero_Chaos) 2015-10-28 03:26:57 UTC]

I gave report on irc but I'll add it here as well.  This patch speed up the initial run of emerge on my livecd by EIGHT minutes.  Please accept it.

[Comment 6 Zac Medico 2015-10-28 16:35:56 UTC]

This is in the master branch:

https://gitweb.gentoo.org/proj/portage.git/commit/?id=9e282e5ef9918264647d114290f59323d21e29a6

[Comment 7 Zac Medico 2016-03-14 02:52:37 UTC]

Fixed in 2.2.24.