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copied!<p>I ended up having to do this in a several stage process.</p> <p>First, I got a list of all the files paths that were ever found in the repository:</p> <pre><code>git log --pretty=format: --name-only --diff-filter=A | sort -u </code></pre> <p>Using that, I was able to determine where the files I wanted to keep had resided at one point or another. In my case, they had resided in four separate directories in the repository throughout their lifetimes. I used this information to manually create a regex, such as <code>(?:^foo|^bar/baz|^qux/(?:moo|woof))</code>. This matches the directories I wanted to keep.</p> <p>I then created a perl script to preserve those pathnames AND any parent pathnames that contained them. </p> <pre><code>use Path::Class; if(scalar(@ARGV) < 1) { die "no regex"; } my $regex = qr/$ARGV[0]/; my @want; my @remove; my $last = undef; my $lastrm = undef; while(<STDIN>) { chomp; my $d = $_; if( $d =~ $regex ) { if( ! defined($last) || ! dir($last)->subsumes(dir($d)) ) { $last = $d; push @want, $d; } } else { if( ! defined($last) || ! dir($last)->subsumes(dir($d)) ) { push @remove, $d; } } } foreach $rm (@remove) { my $no_rm = 0; if( defined($lastrm) && dir($lastrm)->subsumes($rm) ) { $no_rm++; } else { foreach $keep (@want) { if( dir($rm)->subsumes(dir($keep)) ) { $no_rm++; } } } if( $no_rm == 0 ) { print "$rm\n"; $lastrm = $rm; } } </code></pre> <p>Finally, I used git filter-branch to use my new filter with my regex to keep the paths that I wanted.</p> <pre><code>git filter-branch --prune-empty --index filter ' git ls-tree -d -r -t --name-only --full-tree $GIT_COMMIT | sort | /path/to/filter.pl "(?:regex|of|paths)" | xargs -n 50 git rm -rf --cached --ignore-unmatch' -- --all </code></pre> <p>The sort is necessary as it ensures the perl script gets the directories in their proper hierarchy.</p> <p>I hope this helps someone, as it took me many, many hours to come up with this. :)</p>

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