[PATCH v2 0/7] builtin/maintenance: fix auto-detach with non-standard tasks

Hi,

this is the second version of my patch series that fixes how git-maintenance(1) detaches: instead of letting its child process git-gc(1) detach, we now optionally ask git-maintenance(1) itself to detach when running via our auto maintenance mechanism. This fixes behaviour of git-maintenance(1) when configured to run non-standard tasks like the "incremental" task.

There is only a single change compared to v1, namely a rewording of the final commit message. It now clarifies that we really only fix the auto maintenance behaviour, and the default behaviour of git-maintenance(1) remains the same when ran by the user.

Patrick Steinhardt (7):
  config: fix constness of out parameter for `git_config_get_expiry()`
  builtin/gc: refactor to read config into structure
  builtin/gc: fix leaking config values
  builtin/gc: stop processing log file on signal
  builtin/gc: add a `--detach` flag
  builtin/maintenance: add a `--detach` flag
  run-command: fix detaching when running auto maintenance

 Documentation/git-gc.txt |   5 +-
 builtin/gc.c             | 384 ++++++++++++++++++++++++---------------
 config.c                 |   4 +-
 config.h                 |   2 +-
 read-cache.c             |  12 +-
 run-command.c            |  12 +-
 t/t5304-prune.sh         |   1 +
 t/t5616-partial-clone.sh |   6 +-
 t/t6500-gc.sh            |  39 ++++
 t/t7900-maintenance.sh   |  82 ++++++++-
 10 files changed, 381 insertions(+), 166 deletions(-)

Range-diff against v1:
1:  040453f27f = 1:  040453f27f config: fix constness of out parameter for `git_config_get_expiry()`
2:  ff6aa9d7ba = 2:  ff6aa9d7ba builtin/gc: refactor to read config into structure
3:  310e361371 = 3:  310e361371 builtin/gc: fix leaking config values
4:  812c61c9b6 = 4:  812c61c9b6 builtin/gc: stop processing log file on signal
5:  ca78d3dc7c = 5:  ca78d3dc7c builtin/gc: add a `--detach` flag
6:  06dbb73425 = 6:  06dbb73425 builtin/maintenance: add a `--detach` flag
7:  8d6cbae951 ! 7:  6bc170ff05 builtin/maintenance: fix auto-detach with non-standard tasks
    @@ Metadata
     Author: Patrick Steinhardt <ps@pks.im>
     
      ## Commit message ##
    -    builtin/maintenance: fix auto-detach with non-standard tasks
    +    run-command: fix detaching when running auto maintenance
     
         In the past, we used to execute `git gc --auto` as part of our automatic
         housekeeping routines. As git-gc(1) may require quite some time to
    @@ Commit message
         housekeeping tasks, stomping on each others feet.
     
         Fix this bug by asking git-gc(1) to not detach when it is being invoked
    -    via git-maintenance(1). Instead, the latter command now respects a new
    +    via git-maintenance(1). Instead, git-maintenance(1) now respects a new
         config "maintenance.autoDetach", the equivalent of "gc.autoDetach", and
    -    detaches itself into the background if not told otherwise. This should
    -    continue to behave the same for all users which use the git-gc(1) task,
    -    only. For others though, it means that we now properly perform all tasks
    -    in the background.
    +    detaches itself into the background when running as part of our auto
    +    maintenance. This should continue to behave the same for all users which
    +    use the git-gc(1) task, only. For others though, it means that we now
    +    properly perform all tasks in the background. The default behaviour of
    +    git-maintenance(1) when executed by the user does not change, it will
    +    remain in the foreground unless they pass the `--detach` option.
     
         Signed-off-by: Patrick Steinhardt <ps@pks.im>