The git filter-repo
tool and the BFG Repo-Cleaner rewrite your repository's history, which changes the SHAs for existing commits that you alter and any dependent commits. Changed commit SHAs may affect open pull requests in your repository. We recommend merging or closing all open pull requests before removing files from your repository.
You can remove the file from the latest commit with git rm
. For information on removing a file that was added with the latest commit, see "About large files on GitHub."
This article tells you how to make commits with sensitive data unreachable from any branches or tags in your repository on your GitHub Enterprise Server instance. However, it's important to note that those commits may still be accessible in any clones or forks of your repository, directly via their SHA-1 hashes in cached views on GitHub Enterprise Server, and through any pull requests that reference them. You cannot remove sensitive data from other users' clones or forks of your repository, but you can permanently remove cached views and references to the sensitive data in pull requests on GitHub Enterprise Server by contacting your site administrator.
Warning: Once you have pushed a commit to GitHub Enterprise Server, you should consider any sensitive data in the commit compromised. If you committed a password, change it! If you committed a key, generate a new one. Removing the compromised data doesn't resolve its initial exposure, especially in existing clones or forks of your repository. Consider these limitations in your decision to rewrite your repository's history.
Purging a file from your repository's history
You can purge a file from your repository's history using either the git filter-repo
tool or the BFG Repo-Cleaner open source tool.
Using the BFG
The BFG Repo-Cleaner is a tool that's built and maintained by the open source community. It provides a faster, simpler alternative to git filter-branch
for removing unwanted data.
For example, to remove your file with sensitive data and leave your latest commit untouched, run:
$ bfg --delete-files YOUR-FILE-WITH-SENSITIVE-DATA
To replace all text listed in passwords.txt
wherever it can be found in your repository's history, run:
$ bfg --replace-text passwords.txt
After the sensitive data is removed, you must force push your changes to GitHub Enterprise Server.
$ git push --force
See the BFG Repo-Cleaner's documentation for full usage and download instructions.
Using git filter-repo
Warning: If you run git filter-repo
after stashing changes, you won't be able to retrieve your changes with other stash commands. Before running git filter-repo
, we recommend unstashing any changes you've made. To unstash the last set of changes you've stashed, run git stash show -p | git apply -R
. For more information, see Git Tools - Stashing and Cleaning.
To illustrate how git filter-repo
works, we'll show you how to remove your file with sensitive data from the history of your repository and add it to .gitignore
to ensure that it is not accidentally re-committed.
-
Install the latest release of the git filter-repo tool. You can install
git-filter-repo
manually or by using a package manager. For example, to install the tool with HomeBrew, use thebrew install
command.brew install git-filter-repo
For more information, see INSTALL.md in the
newren/git-filter-repo
repository. -
If you don't already have a local copy of your repository with sensitive data in its history, clone the repository to your local computer.
$ git clone https://hostname/YOUR-USERNAME/YOUR-REPOSITORY > Initialized empty Git repository in /Users/YOUR-FILE-PATH/YOUR-REPOSITORY/.git/ > remote: Counting objects: 1301, done. > remote: Compressing objects: 100% (769/769), done. > remote: Total 1301 (delta 724), reused 910 (delta 522) > Receiving objects: 100% (1301/1301), 164.39 KiB, done. > Resolving deltas: 100% (724/724), done.
-
Navigate into the repository's working directory.
$ cd YOUR-REPOSITORY
-
Run the following command, replacing
PATH-TO-YOUR-FILE-WITH-SENSITIVE-DATA
with the path to the file you want to remove, not just its filename. These arguments will:- Force Git to process, but not check out, the entire history of every branch and tag
- Remove the specified file, as well as any empty commits generated as a result
- Remove some configurations, such as the remote URL, stored in the .git/config file. You may want to back up this file in advance for restoration later.
- Overwrite your existing tags
$ git filter-repo --invert-paths --path PATH-TO-YOUR-FILE-WITH-SENSITIVE-DATA Parsed 197 commits New history written in 0.11 seconds; now repacking/cleaning... Repacking your repo and cleaning out old unneeded objects Enumerating objects: 210, done. Counting objects: 100% (210/210), done. Delta compression using up to 12 threads Compressing objects: 100% (127/127), done. Writing objects: 100% (210/210), done. Building bitmaps: 100% (48/48), done. Total 210 (delta 98), reused 144 (delta 75), pack-reused 0 Completely finished after 0.64 seconds.
Note: If the file with sensitive data used to exist at any other paths (because it was moved or renamed), you must run this command on those paths, as well.
-
Add your file with sensitive data to
.gitignore
to ensure that you don't accidentally commit it again.$ echo "YOUR-FILE-WITH-SENSITIVE-DATA" >> .gitignore $ git add .gitignore $ git commit -m "Add YOUR-FILE-WITH-SENSITIVE-DATA to .gitignore" > [main 051452f] Add YOUR-FILE-WITH-SENSITIVE-DATA to .gitignore > 1 files changed, 1 insertions(+), 0 deletions(-)
-
Double-check that you've removed everything you wanted to from your repository's history, and that all of your branches are checked out.
-
Once you're happy with the state of your repository, force-push your local changes to overwrite your repository on your GitHub Enterprise Server instance, as well as all the branches you've pushed up:
$ git push origin --force --all > Counting objects: 1074, done. > Delta compression using 2 threads. > Compressing objects: 100% (677/677), done. > Writing objects: 100% (1058/1058), 148.85 KiB, done. > Total 1058 (delta 590), reused 602 (delta 378) > To https://hostname/YOUR-USERNAME/YOUR-REPOSITORY.git > + 48dc599...051452f main -> main (forced update)
-
In order to remove the sensitive file from your tagged releases, you'll also need to force-push against your Git tags:
$ git push origin --force --tags > Counting objects: 321, done. > Delta compression using up to 8 threads. > Compressing objects: 100% (166/166), done. > Writing objects: 100% (321/321), 331.74 KiB | 0 bytes/s, done. > Total 321 (delta 124), reused 269 (delta 108) > To https://hostname/YOUR-USERNAME/YOUR-REPOSITORY.git > + 48dc599...051452f main -> main (forced update)
Fully removing the data from GitHub
After using either the BFG tool or git filter-repo
to remove the sensitive data and pushing your changes to GitHub Enterprise Server, you must take a few more steps to fully remove the data from GitHub Enterprise Server.
-
Contact your site administrator, asking them to remove cached views and references to the sensitive data in pull requests on GitHub Enterprise Server. Please provide the name of the repository and/or a link to the commit you need removed.
-
Tell your collaborators to rebase, not merge, any branches they created off of your old (tainted) repository history. One merge commit could reintroduce some or all of the tainted history that you just went to the trouble of purging.
-
After some time has passed and you're confident that the BFG tool /
git filter-repo
had no unintended side effects, you can force all objects in your local repository to be dereferenced and garbage collected with the following commands (using Git 1.8.5 or newer):$ git for-each-ref --format="delete %(refname)" refs/original | git update-ref --stdin $ git reflog expire --expire=now --all $ git gc --prune=now > Counting objects: 2437, done. > Delta compression using up to 4 threads. > Compressing objects: 100% (1378/1378), done. > Writing objects: 100% (2437/2437), done. > Total 2437 (delta 1461), reused 1802 (delta 1048)
Note: You can also achieve this by pushing your filtered history to a new or empty repository and then making a fresh clone from GitHub Enterprise Server.
Avoiding accidental commits in the future
There are a few simple tricks to avoid committing things you don't want committed:
- Use a visual program like GitHub Desktop or gitk to commit changes. Visual programs generally make it easier to see exactly which files will be added, deleted, and modified with each commit.
- Avoid the catch-all commands
git add .
andgit commit -a
on the command line—usegit add filename
andgit rm filename
to individually stage files, instead. - Use
git add --interactive
to individually review and stage changes within each file. - Use
git diff --cached
to review the changes that you have staged for commit. This is the exact diff thatgit commit
will produce as long as you don't use the-a
flag.