FETCH_HEAD is a file Git updates when it fetches from a remote. It records the fetched refs and the object IDs they point to; it is not a regular branch. You can merge a commit referenced by FETCH_HEAD, but do not do it blindly: inspect what your fetch recorded and confirm it belongs in your current branch first.
What FETCH_HEAD means
When Git fetches, it writes information about the fetched references to FETCH_HEAD in the repository’s Git directory. The file records ref names and the object IDs they point to. Git and scripts can use that information; the Git Project’s git-fetch documentation demonstrates inspecting it with git log FETCH_HEAD.
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Unlike a remote-tracking branch such as origin/main, FETCH_HEAD is not a stable branch name. Its meaning depends on fetch activity and options: by default, a new fetch overwrites the file’s previous contents, while git fetch --append appends entries. A fetch may involve one or more refs, and the fetch refspec and options affect what is fetched and whether remote-tracking refs are updated.
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Why you shouldn’t merge it without checking
The problem is not that merging FETCH_HEAD is inherently wrong. The risk is that you may integrate a target you did not intend. For example, a later fetch may have replaced the file’s previous contents, or the current fetch may have recorded refs that are not appropriate for the branch you have checked out.
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Git’s git-merge documentation describes merge as integrating named commits into the current branch. So before using FETCH_HEAD as the merge target, verify both what it points to and which branch will receive the merge.
Inspect the fetch before integrating it
Use this sequence when you want control over what gets brought into your branch:
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git fetch— retrieve updates without choosing an integration action.git log --oneline --decorate FETCH_HEAD— review the fetched commit and its history.git status --short --branch— check the branch you are on and the state of your working tree.- If the fetched history is the intended target, choose an integration action—such as merge, rebase, or cherry-pick—or decide not to integrate it. For a deliberate merge, first check out the intended destination branch, then run
git merge FETCH_HEAD.
If the log does not make clear what was fetched, stop and inspect the fetch command, refspec, and remote-tracking refs before integrating. Do not assume the file still refers to an earlier fetch.
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git pull combines a fetch with a subsequent integration step. The configured or specified strategy determines how that integration proceeds; see the Git Project’s git-pull documentation. Fetching separately lets you review what arrived before you choose whether and how to integrate it. Use that extra control when you are unsure what the remote update contains or want to select a particular target.
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