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From: Max Gautier <mg@xxxxxxxxxxxxxxxx>
To: git@xxxxxxxxxxxxxxx
Cc: Lénaïc Huard <lenaic@xxxxxxxxx>, Derrick Stolee <stolee@xxxxxxxxx>
Bcc: 
Reply-To: 
Subject: [RFC PATCH 0/5] maintenance: use packaged systemd units
In-Reply-To: 

Hello,

This is a proposal to distribute the timers of the systemd scheduler of
git-maintenance directly, rather than inlining them into the code and
writing them on demand.
IMO, this is better than using the user $XDG_CONFIG_HOME, and allows
that user to override them if they so wish. It's also less code.

We also move away from using the random minute, and instead rely on
systemd features to achieve the same goal (see patch 2). This allows us
to go back to using unit templating for the timers.
(Not that even if we really more specific OnCalendar= settings for each
timer, we should still do it that way, but instead distribute override
alongside the template, i.e

/usr/lib/systemd-user/git-maintenance@daily.timer.d/override.conf:
[Timer]
OnCalendar=<specific calender spec for daily>

The cleanup code for the units written in $XDG_CONFIG_HOME is adapted,
and takes care of not removing legitimate user overrides, by checking
the file start.

Patch 5 removes the cleanup code, it should not be applied right away,
but once enough time has passed and we can be reasonably sure that no
one still has the old units laying around.

Testing:
Best way to approximate having the systemd units in /usr/lib would be to
either :
- sudo cp systemd/user/git-maintenance* /etc/systemd/user/
- sudo systemctl link --global systemd/user/git-maintenance* -> it's not
  exactly the same when enabling the you'll have a link in
  $XDG_CONFIG_HOME to your git source directory, so if you re-run `git
  start maintenance with the previous code, it will change your source.
  IMO the first method is less confusing.

Unresolved (reasons why it's still an RFC):
- Should I implement conditional install of systemd units (if systemd is
  available) ? I've avoided digging too deep in the Makefile, but that's
  doable, I think.


---
 Documentation/git-maintenance.txt     |  33 ++--
 Makefile                              |   4 +
 builtin/gc.c                          | 279 ++--------------------------------
 systemd/user/git-maintenance@.service |  17 +++
 systemd/user/git-maintenance@.timer   |  12 ++
 5 files changed, 63 insertions(+), 282 deletions(-)




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