Why Does This Happen?
When comparing two branches using the
git diff command, the "
fatal: ambiguous argument '...': unknown revision or path not in the working tree." error indicates that the branch name(s) you provided as arguments to
git diff (e.g.
git diff <branch-1> <branch-2>) cannot be recognized within the repository's history. This error typically occurs when:
- The specified branch does not exist in the current working directory and/or in the remote repository, or;
- The specified branch was shallow cloned.
How to Fix the Issue?
To resolve this issue, you can try the following steps:
- Check the branch names;
- Check your current working directory;
- Convert to Fully Cloned Repository if Shallow Cloned.
Check the Branch Names
If you intended to refer to a specific branch, double-check the spelling and ensure that the branch actually exists. You can use the
git branch command to list the available branches. If your desired branch is not listed, it means that it is not available locally. In this case, you can do either of the following:
- Switch to or check out the remote branch locally (e.g. using the
git switch <branch>command) and try the
git diffcommand again, or;
- Prefix the remote repository name to the branch name. For example, if the branch you want to compare is named
my-branchin the remote repository named
origin, you can use
origin/my-branchas the branch name in the
For example, if running
git diff branch-1 branch-2 is giving you the error "
fatal: ambiguous argument 'branch-2': unknown revision or path not in the working tree.", then it means that
branch-2 does not exist locally. You can check the local branches using the
git branch command to verify this:
$ git branch branch-3 * branch-1 master
Please note that the asterisk before
branch-1 indicates that it is the currently checked out or active branch.
If the branch does not exist in the list then you can check out the remote branch and then run the
git diff command, for example, like so:
$ git switch branch-2 Switched to branch 'branch-2' Your branch is up to date with 'origin/branch-2'. $ git diff branch-1 branch-2 # ...
Now, if you re-reun
git branch, it should show "
branch-2" in the list.
Alternatively, you can prefix the remote repository name to the branch name, for example, like so:
$ git diff branch-1 origin/branch-2 # ...
This will compare the local branch "
branch-1" to remote branch "
Check the Current Working Directory
You can make sure that you are running the
git diff command in the correct working directory. If the branch or file you want to compare is located in a different directory, then navigate to that directory in your terminal before running the
git diff command.
Convert to Fully Cloned Repository if Shallow Cloned
If you shallow cloned the git repository, for example, using the following command:
git clone --depth 1 <repo-url>
Then it may give you the "
fatal: ambiguous argument 'branch-2': unknown revision or path not in the working tree." error when running
git diff command. To fix this, you can "unshallow" the shallow cloned repository and convert it to fully cloned using the following command:
git fetch --unshallow
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