git find fat commit

Question

Is it possible to get info about how much space is wasted by changes in every commit — so I can find commits which added big files or a lot of files. This is all to try to reduce git repo size (rebasing and maybe filtering commits)

Agio

Consider simply running git gc occasionally, possibly as git gc --aggressive – Riess

git gc (and git gc --prune); --aggresive can even give worse results (but usually shouldn't), and is usually not worth it. – Lindley

This answer is much better: https://mcmap.net/q/13859/-git-show-total-file-size-difference-between-two-commits – Choiseul

Answer 1

Forgot to reply, my answer is:

git rev-list --all --pretty=format:'%H%n%an%n%s'    # get all commits
git diff-tree -r -c -M -C --no-commit-id #{sha}     # get new blobs for each commit
git cat-file --batch-check << blob ids              # get size of each blob

Agio

@sschuberth: If I read your script correctly it only takes into account files that were added in a particular commit. It won't detect when a file grew substantially in a commit. – Sweeney

@kynan: You're right, as that's what the OP requested (and what I needed). But it's easy to change the script to detect modified files: Basically you just need to replace "A" by "M" in the grep call. That will report the total file size after the modification (not the number of bytes added / removed). I'd happily accept a pull request on GitHub to make the script more generic. – Original

Broken link, the script is now located here – Shelli

--diff-filter might be used instead of the unreliable grep but anyways, this answer is much better IMO: https://mcmap.net/q/13859/-git-show-total-file-size-difference-between-two-commits – Choiseul

Answer 2

You could do this:

git ls-tree -r -t -l --full-name HEAD | sort -n -k 4

This will show the largest files at the bottom (fourth column is the file (blob) size.

If you need to look at different branches you'll want to change HEAD to those branch names. Or, put this in a loop over the branches, tags, or revs you are interested in.

Manifestation

Answer 3

All of the solutions provided here focus on file sizes but the original question asked was about commit sizes, which in my opinion, and in my case in point, was more important to find (because what I wanted is to get rid of many small binaries introduced in a single commit, which summed up accounted for a lot of size, but small size if measured individually by file).

A solution that focuses on commit sizes is the provided here, which is this perl script:

#!/usr/bin/perl
foreach my $rev (`git rev-list --all --pretty=oneline`) {
  my $tot = 0;
  ($sha = $rev) =~ s/\s.*$//;
  foreach my $blob (`git diff-tree -r -c -M -C --no-commit-id $sha`) {
    $blob = (split /\s/, $blob)[3];
    next if $blob == "0000000000000000000000000000000000000000"; # Deleted
    my $size = `echo $blob | git cat-file --batch-check`;
    $size = (split /\s/, $size)[2];
    $tot += int($size);
  }
  my $revn = substr($rev, 0, 40);
#  if ($tot > 1000000) {
    print "$tot $revn " . `git show --pretty="format:" --name-only $revn | wc -l`  ;
#  }
}

And which I call like this:

./git-commit-sizes.pl | sort -n -k 1

Lowlife

Answer 4

Personally, I found this answer to be most helpful when trying to find large files in the history of a git repo: Find files in git repo over x megabytes, that don't exist in HEAD

Frederickson

Answer 5

#!/bin/bash
COMMITSHA=$1

CURRENTSIZE=$(git ls-tree -lrt $COMMITSHA | grep blob | sed -E "s/.{53} *([0-9]*).*/\1/g" | paste -sd+ - | bc)
PREVSIZE=$(git ls-tree -lrt $COMMITSHA^ | grep blob | sed -E "s/.{53} *([0-9]*).*/\1/g" | paste -sd+ - | bc)
echo "$CURRENTSIZE - $PREVSIZE" | bc

Cowey

And also I suggest to use git format-patch to get commit size (there will be some additional size for mail header, but actually if you need to fast commit is not too huge - it's not so important to get exact size, +- 1K will be good accuracy) – Cowey

Answer 6

git fat find N where N is in bytes will return all the files in the whole history which are larger than N bytes.

You can find out more about git-fat here: https://github.com/cyaninc/git-fat

Moonstruck

Bummer. I tried it on Git Shell for Windows that comes with GitHub Desktop and the command didn't work, giving me an error. – Oribel

@Oribel I think you have to install git fat on you computer – Godthaab

Answer 7

git cat-file -s <object> where <object> can refer to a commit, blob, tree, or tag.

Embay