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FETCH_HEAD is a file Git updates during a fetch to record fetched references and the object IDs they point to. You can merge a commit recorded there, but do not run git merge FETCH_HEAD blindly: check what your most recent fetch recorded and confirm it is the change you intend to bring into your current branch.
What FETCH_HEAD means
When Git fetches data from a remote repository, it records information about fetched refs in FETCH_HEAD inside the repository’s Git directory. The file is not a regular branch name. Git and other commands can use its contents to refer to fetched commits; the Git Project’s git-fetch documentation demonstrates inspecting one with git log FETCH_HEAD.
A remote-tracking branch, such as origin/main, is a named ref that tracks a branch on a remote. FETCH_HEAD, by contrast, records fetch results. Which refs are fetched and whether tracking refs are updated depends on the fetch refspec and options you use.
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By default, a subsequent fetch overwrites the previous contents of .git/FETCH_HEAD; git fetch --append appends results instead. That means the name does not guarantee that the file still refers to the same fetch you inspected earlier. A fetch may also record one or more refs, and the file alone does not tell you whether a particular fetched commit is an appropriate addition to your current branch.
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So the issue is not that merging FETCH_HEAD is inherently wrong. The risk is selecting an integration target without verifying what it represents. Git’s git-merge documentation describes merge as integrating named commits into the current branch; before doing that, make sure the current branch is the intended destination and the fetched commit is the intended source.
Fetch, inspect, then choose how to integrate
If you want to review changes before deciding whether to integrate them, use a fetch-first workflow:
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Fetch from the intended remote:
git fetch origin. -
Inspect the fetched commit and its history:
git log --oneline --decorate FETCH_HEAD.Recommended Free Tools
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Check which branch is currently checked out with
git branch --show-current. Switch to the intended destination branch before integrating if necessary. -
Choose what to do with the fetched change. For example, merge the confirmed target with
git merge FETCH_HEAD, rebase according to your team’s workflow, cherry-pick a particular commit, or make no changes.
Git’s git-pull documentation describes git pull as fetching and then integrating according to the selected or configured strategy. Use it when you want that fetch-and-integrate operation; fetch separately when you want to inspect first and choose the integration action afterward.
When merging FETCH_HEAD is reasonable
Merging FETCH_HEAD can be deliberate when you have just fetched the intended source, inspected the result, and confirmed that it belongs on the checked-out destination branch. In that case, the command is an explicit choice—not a safe shortcut based solely on the name.
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