Re: [PATCH 3/3] Teach git-index-pack how to keep a pack file.

Quoting r. Junio C Hamano [off-list ref]:

It might be a good idea to leave process ID of the caller of the
index-pack as part of --keep="reason" string, along with the
timestamp to help the user decide if the .keep is leftover or
still in progress (the timestamp can be seen from ls -l *.keep
so it is not strictly needed).

Add hostname to that, for repositories that reside on networked file systems.

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