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Upgrade git package on zuul-merger instances contint1001 / contint2001 to benefit git-daemon
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The zuul-merger git repositories are exposed to the Jenkins slaves via a git-daemon process. The two instances are on contint1001 and contint2001 and each run git 2.1.4 from jessie/main.

git 2.11.0 is available from jessie-backports/main. Potentially we could upgrade git which might benefit git-daemon. No idea about what has changed in git-daemon though.

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We should upgrade git on the Jessie CI instances as well. One benefit is updating submodules in parallel which would benefit operations/puppet (T166888: CI for operations/puppet is taking too long).

Change 360420 had a related patch set uploaded (by Hashar; owner: Hashar):
[operations/puppet@production] contint1001: upgrade git on zuul mergers

Lets upgrade git on the zuul-merger in production and see what happens. I am not too worried.

Mentioned in SAL (#wikimedia-operations) [2017-08-31T08:57:10Z] <hashar> contint2001 upgrading git, restarting git-daemon and zuul-merger - T161086

Upgraded on contint2001

# apt-get install -t jessie-backports git -V
The following packages will be upgraded:
   git (2.1.4-2.1+deb8u4 => 2.11.0-3~bpo8+1)
   git-man (2.1.4-2.1+deb8u4 => 2.11.0-3~bpo8+1)

# systemctl restart git-daemon

If all goes fine, I will then do contint1001.

Mentioned in SAL (#wikimedia-operations) [2017-08-31T09:04:17Z] <hashar> contint1001 upgrading git, restarting git-daemon and zuul-merger - T161086

Change 360420 merged by Dzahn:
[operations/puppet@production] contint: upgrade git on zuul mergers