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git-pull: Avoid merge-base on detached head

git pull --rebase does some clever tricks to find the base
for $upstream, but it forgets that we may not have any
branch at all.  When this happens, git merge-base reports its
"usage" help in the middle of an otherwise successful
rebase operation, because git-merge is called with one too
few parameters.

Since we do not need the merge-base trick in the case of a
detached HEAD, detect this condition and bypass the clever
trick and the usage noise.

Signed-off-by: Phil Hord <>
Signed-off-by: Jeff King <>
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commit e980765c59c173e9a10ce1069c763645b87fd50c 1 parent 8c7a786
@phord phord authored peff committed
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@@ -200,6 +200,7 @@ test true = "$rebase" && {
require_clean_work_tree "pull with rebase" "Please commit or stash them."
oldremoteref= &&
+ test -n "$curr_branch" &&
. git-parse-remote &&
remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&

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