[gentoo-dev-announce] Signed push & clock drift rejection

[Robin H. Johnson]

Hi all,

In tracing down problems with the git->rsync path, it has been noticed
that some developers have significant clock drift on their local systems
(up to one case of 14 days wrong), and it's potentially contributing to
problems in generating the rsync tree.

I have implemented a check as part of the hook that validates Git push
certificates (require-signed-push). It looks for clock drift or an
overly long push, and aborts if needed.

The tolerances are presently set to:
- 5 seconds of clock drift.
- 'git push' must be completed in 60 seconds.

The two possible errors you will get during push are:
===
Your system clock is off by 119 seconds (limit 5).
Run NTP, rebase your commits as needed, and push again.
===
Try again! Your push took 80 seconds (limit 60).
===

If you do get the first error, please strongly look at running ntpd,
tlsdate or some other time keeping solution.

This applies to all Git repos that require signed pushes presently:
- data/*
- foundation/*
- infra/*
- proj/portage
- repo/gentoo
- repo/proj/gen-b0rk
(and a few more)

-- 
Robin Hugh Johnson
Gentoo Linux: Dev, Infra Lead, Foundation Trustee & Treasurer
E-Mail   : robbat2@g.o
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