Re: hot to get file sizes in git log output

From: David Lang <david@lang.hm>
Date: Oct 21, 2017, 02:38 UTC
Message-ID: <nycvar.QRO.7.76.6.1710201929210.5973@qynat-yncgbc>
In-Reply-To: <CAPig+cQ56ZNaEOkV+ZCq2KsL-2nTockTrEbqvj=j_wO0YtCx6g@mail.gmail.com>

On Fri, 20 Oct 2017, Eric Sunshine wrote:

Show 17 quoted lines

>>> I'm not exactly sure what you mean by size, but if you want to show
>>> how many lines were added and removed by a given commit for each file,
>>> you can use the "--stat" option to produce a diffstat. The "size" of
>>> the files in each commit isn't very meaningful to the commit itself,
>>> but a stat of how much was removed might be more accurate to what
>>> you're looking for.
>>
>> That's a good suggestion, and hopefully could help David answer his
>> original question.
>>
>> I took the request to mean "walk through history, and for each file that
>> a commit touches, show its size". Which is a bit harder to do, and I
>> think you need to script a little:
>
> David's mention of "a particular file", suggests to me that something
> "bad" happened to one file, and he wants to know in which commit that
> "badness" happened. If so, then it sounds like a job for git-bisect.

In this case, I have git store a copy of the state file for chromium (and do a similar thing for firefox), so that if something bad happens and it crashes and looses all 200-400 tabs in a way that it's recovery doesn't work, I can go back to a prior version.

This is done by having the following crontab entries, along with smudge filters that change the one-line json to pretty printed json before the commit.

0 * * * * dlang cd /home/dlang/.config/chromium/Default; git add *Session *Tabs Bookmarks History ; git commit -mupdate > /dev/null 2>&1

0 0 3 * * dlang cd /home/dlang/.config/chromium/Default; git gc --aggressive > /dev/null 2>&1

0 * * * * dlang cd /home/dlang/.mozilla/firefox/bux6mwl1.default/sessionstore-backups; git add *.js ; git commit -mupdate > /dev/null 2>&1

0 0 3 * * dlang cd /home/dlang/.mozilla/firefox/bux6mwl1.default/sessionstore-backups; git gc --aggressive > /dev/null 2>&1

This has saved me many times in the past. But this time I didn't recognize when the problem happened because instead of a crash, it just closed all the tabs except the one that was open. Once I realized all my other tabs were gone, I didn't have time to mess with it for a few days. So the problem could have happened anytime in the last week or two.

I'm sure that when this happened, the files shrunk drastically (from several hundred tabs to a dozen or so will be very obvious).

But I don't have any specific line I can look at, the lines that are there change pretty regularly, and/or would not have changed at the transition.

git whatchanged shows commits like:

commit fb7e54c12ddc7c87c4862806d583f5c6abf3e731
Author: David Lang <david@lang.hm>
Date:   Fri Oct 20 11:00:01 2017 -0700

     update

:100644 100644 1a842ca... 290e9dd... M Default/Bookmarks :100644 100644 1cd745c... 388a455... M Default/Current Session :100644 100644 51074ad... c4dce40... M Default/Current Tabs

If there was a way to add file size to this output, it would be perfect for what I'm needing.

David Lang