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From: Eric Sunshine <sunshine@sunshineco.com>
To: Lars Schneider <larsxschneider@gmail.com>
Cc: Git List <git@vger.kernel.org>, Jeff King <peff@peff.net>,
	Taylor Blau <me@ttaylorr.com>,
	"brian m. carlson" <sandals@crustytoothpaste.net>
Subject: Re: Import/Export as a fast way to purge files from Git?
Date: Sun, 23 Sep 2018 10:55:52 -0400
Message-ID: <CAPig+cTLjThK4CVzfgV=Uk5OumpjhaQD_YNXmg7pNtkkUFiiyQ@mail.gmail.com> (raw)
In-Reply-To: <F65AF000-7AE0-44C8-81C8-E58D6769FAA3@gmail.com>

On Sun, Sep 23, 2018 at 9:05 AM Lars Schneider <larsxschneider@gmail.com> wrote:
> I recently had to purge files from large Git repos (many files, many commits).
> The usual recommendation is to use `git filter-branch --index-filter` to purge
> files. However, this is *very* slow for large repos (e.g. it takes 45min to
> remove the `builtin` directory from git core). I realized that I can remove
> files *way* faster by exporting the repo, removing the file references,
> and then importing the repo (see Perl script below, it takes ~30sec to remove
> the `builtin` directory from git core). Do you see any problem with this
> approach?

A couple comments:

For purging files from a history, take a look at BFG[1] which bills
itself as "a simpler, faster alternative to git-filter-branch for
cleansing bad data out of your Git repository history".

The approach of exporting to a fast-import stream, modifying the
stream, and re-importing is quite reasonable. However, rather than
re-inventing, take a look at reposurgeon[2], which allows you to do
major surgery on fast-import streams. Not only can it purge files from
a repository, but it can slice, dice, puree, and saute pretty much any
attribute of a repository.

[1]: https://rtyley.github.io/bfg-repo-cleaner/
[2]: http://www.catb.org/esr/reposurgeon/

  reply index

Thread overview: 90+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-23 13:04 Lars Schneider
2018-09-23 14:55 ` Eric Sunshine [this message]
2018-09-23 15:58   ` Lars Schneider
2018-09-23 15:53 ` brian m. carlson
2018-09-23 17:04   ` Jeff King
2018-09-24 17:24 ` Elijah Newren
2018-10-31 19:15   ` Lars Schneider
2018-11-01  7:12     ` Elijah Newren
2018-11-11  6:23       ` [PATCH 00/10] fast export and import fixes and features Elijah Newren
2018-11-11  6:23         ` [PATCH 01/10] git-fast-import.txt: fix documentation for --quiet option Elijah Newren
2018-11-11  6:33           ` Jeff King
2018-11-11  6:23         ` [PATCH 02/10] git-fast-export.txt: clarify misleading documentation about rev-list args Elijah Newren
2018-11-11  6:36           ` Jeff King
2018-11-11  7:17             ` Elijah Newren
2018-11-13 23:25               ` Elijah Newren
2018-11-13 23:39                 ` Jonathan Nieder
2018-11-14  0:02                   ` Elijah Newren
2018-11-11  6:23         ` [PATCH 03/10] fast-export: use value from correct enum Elijah Newren
2018-11-11  6:36           ` Jeff King
2018-11-11 20:10             ` Ævar Arnfjörð Bjarmason
2018-11-12  9:12               ` Ævar Arnfjörð Bjarmason
2018-11-12 11:31               ` Jeff King
2018-11-11  6:23         ` [PATCH 04/10] fast-export: avoid dying when filtering by paths and old tags exist Elijah Newren
2018-11-11  6:44           ` Jeff King
2018-11-11  7:38             ` Elijah Newren
2018-11-12 12:32               ` Jeff King
2018-11-12 22:50             ` brian m. carlson
2018-11-13 14:38               ` Jeff King
2018-11-11  6:23         ` [PATCH 05/10] fast-export: move commit rewriting logic into a function for reuse Elijah Newren
2018-11-11  6:47           ` Jeff King
2018-11-11  6:23         ` [PATCH 06/10] fast-export: when using paths, avoid corrupt stream with non-existent mark Elijah Newren
2018-11-11  6:53           ` Jeff King
2018-11-11  8:01             ` Elijah Newren
2018-11-12 12:45               ` Jeff King
2018-11-12 15:36                 ` Elijah Newren
2018-11-11  6:23         ` [PATCH 07/10] fast-export: ensure we export requested refs Elijah Newren
2018-11-11  7:02           ` Jeff King
2018-11-11  8:20             ` Elijah Newren
2018-11-11  6:23         ` [PATCH 08/10] fast-export: add --reference-excluded-parents option Elijah Newren
2018-11-11  7:11           ` Jeff King
2018-11-11  6:23         ` [PATCH 09/10] fast-export: add a --show-original-ids option to show original names Elijah Newren
2018-11-11  7:20           ` Jeff King
2018-11-11  8:32             ` Elijah Newren
2018-11-12 12:53               ` Jeff King
2018-11-12 15:46                 ` Elijah Newren
2018-11-12 16:31                   ` Jeff King
2018-11-11  6:23         ` [PATCH 10/10] fast-export: add --always-show-modify-after-rename Elijah Newren
2018-11-11  7:23           ` Jeff King
2018-11-11  8:42             ` Elijah Newren
2018-11-12 12:58               ` Jeff King
2018-11-12 18:08                 ` Elijah Newren
2018-11-13 14:45                   ` Jeff King
2018-11-13 17:10                     ` Elijah Newren
2018-11-14  7:14                       ` Jeff King
2018-11-11  7:27         ` [PATCH 00/10] fast export and import fixes and features Jeff King
2018-11-11  8:44           ` Elijah Newren
2018-11-12 13:00             ` Jeff King
2018-11-14  0:25         ` [PATCH v2 00/11] " Elijah Newren
2018-11-14  0:25           ` [PATCH v2 01/11] git-fast-import.txt: fix documentation for --quiet option Elijah Newren
2018-11-14  0:25           ` [PATCH v2 02/11] git-fast-export.txt: clarify misleading documentation about rev-list args Elijah Newren
2018-11-14  0:25           ` [PATCH v2 03/11] fast-export: use value from correct enum Elijah Newren
2018-11-14  0:25           ` [PATCH v2 04/11] fast-export: avoid dying when filtering by paths and old tags exist Elijah Newren
2018-11-14 19:17             ` SZEDER Gábor
2018-11-14 23:13               ` Elijah Newren
2018-11-14  0:25           ` [PATCH v2 05/11] fast-export: move commit rewriting logic into a function for reuse Elijah Newren
2018-11-14  0:25           ` [PATCH v2 06/11] fast-export: when using paths, avoid corrupt stream with non-existent mark Elijah Newren
2018-11-14  0:25           ` [PATCH v2 07/11] fast-export: ensure we export requested refs Elijah Newren
2018-11-14  0:25           ` [PATCH v2 08/11] fast-export: add --reference-excluded-parents option Elijah Newren
2018-11-14 19:27             ` SZEDER Gábor
2018-11-14 23:16               ` Elijah Newren
2018-11-14  0:25           ` [PATCH v2 09/11] fast-import: remove unmaintained duplicate documentation Elijah Newren
2018-11-14  0:25           ` [PATCH v2 10/11] fast-export: add a --show-original-ids option to show original names Elijah Newren
2018-11-14  0:26           ` [PATCH v2 11/11] fast-export: add --always-show-modify-after-rename Elijah Newren
2018-11-14  7:25           ` [PATCH v2 00/11] fast export and import fixes and features Jeff King
2018-11-16  7:59           ` [PATCH v3 " Elijah Newren
2018-11-16  7:59             ` [PATCH v3 01/11] fast-export: convert sha1 to oid Elijah Newren
2018-11-16  7:59             ` [PATCH v3 02/11] git-fast-import.txt: fix documentation for --quiet option Elijah Newren
2018-11-16  7:59             ` [PATCH v3 03/11] git-fast-export.txt: clarify misleading documentation about rev-list args Elijah Newren
2018-11-16  7:59             ` [PATCH v3 04/11] fast-export: use value from correct enum Elijah Newren
2018-11-16  7:59             ` [PATCH v3 05/11] fast-export: avoid dying when filtering by paths and old tags exist Elijah Newren
2018-11-16  7:59             ` [PATCH v3 06/11] fast-export: move commit rewriting logic into a function for reuse Elijah Newren
2018-11-16  7:59             ` [PATCH v3 07/11] fast-export: when using paths, avoid corrupt stream with non-existent mark Elijah Newren
2018-11-16  7:59             ` [PATCH v3 08/11] fast-export: ensure we export requested refs Elijah Newren
2018-11-16  7:59             ` [PATCH v3 09/11] fast-export: add --reference-excluded-parents option Elijah Newren
2018-11-16  7:59             ` [PATCH v3 10/11] fast-import: remove unmaintained duplicate documentation Elijah Newren
2018-11-16  7:59             ` [PATCH v3 11/11] fast-export: add a --show-original-ids option to show original names Elijah Newren
2018-11-16 12:29               ` SZEDER Gábor
2018-11-16  8:50             ` [PATCH v3 00/11] fast export and import fixes and features Jeff King
2018-11-12  9:17       ` Import/Export as a fast way to purge files from Git? Ævar Arnfjörð Bjarmason
2018-11-12 15:34         ` Elijah Newren

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