Reset or revert a specific file to a specific revision using Git?
I have made some changes to a file which has been committed a few times as part of a group of files, but now want to reset/revert the changes on it back to a previous version.
I have done a git log along with a git diff to find the revision I need, but just have no idea how to get the file back to its former state in the past.
Assuming the hash of the commit you want is c5f567 :
git checkout c5f567 -- file1/to/restore file2/to/restore
The git checkout man page gives more information.
If you want to revert to the commit before c5f567 , append ~1 (works with any number):
git checkout c5f567~1 -- file1/to/restore file2/to/restore
As a side note, I've always been uncomfortable with this command because it's used for both ordinary things (changing between branches) and unusual, destructive things (discarding changes in the working directory).
You can quickly review the changes made to a file using the diff command:
git diff <commit hash> <filename>
Then to revert a specific file to that commit use the reset command:
git reset <commit hash> <filename>
You may need to use the --hard option if you have local modifications.
A good workflow for managaging waypoints is to use tags to cleanly mark points in your timeline. I can't quite understand your last sentence but what you may want is diverge a branch from a previous point in time. To do this, use the handy checkout command:
git checkout <commit hash>
git checkout -b <new branch name>
You can then rebase that against your mainline when you are ready to merge those changes:
git checkout <my branch>
git rebase master
git checkout master
git merge <my branch>
You can use any reference to a git commit, including the SHA-1 if that's most convenient. The point is that the command looks like this:
git checkout [commit-ref] -- [filename]
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