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Allow git-checkout when on a non-existant branch.
I've seen some users get into situtations where their HEAD symbolic-ref is pointing at a non-existant ref. (Sometimes this happens during clone when the remote repository lacks a 'master' branch.) If this happens the user is unable to use git-checkout to switch branches as there is no prior commit to merge from. So instead of giving the user low-level errors about how HEAD can't be resolved and how not a single revision was given change the type of checkout to be a force and go through with the user's request anyway. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -4,8 +4,8 @@ USAGE='[-f] [-b <new_branch>] [-m] [<branch>] [<paths>...]'
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SUBDIRECTORY_OK=Sometimes
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. git-sh-setup
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old=$(git-rev-parse HEAD)
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old_name=HEAD
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old=$(git-rev-parse --verify $old_name 2>/dev/null)
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new=
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new_name=
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force=
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@ -139,6 +139,13 @@ fi
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die "git checkout: to checkout the requested commit you need to specify
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a name for a new branch which is created and switched to"
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if [ "X$old" = X ]
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then
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echo "warning: You do not appear to currently be on a branch." >&2
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echo "warning: Forcing checkout of $new_name." >&2
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force=1
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fi
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if [ "$force" ]
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then
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git-read-tree --reset -u $new
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@ -31,6 +31,15 @@ test_expect_success setup '
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git checkout master
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'
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test_expect_success "checkout from non-existing branch" '
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git checkout -b delete-me master &&
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rm .git/refs/heads/delete-me &&
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test refs/heads/delete-me = "$(git symbolic-ref HEAD)" &&
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git checkout master &&
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test refs/heads/master = "$(git symbolic-ref HEAD)"
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'
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test_expect_success "checkout with dirty tree without -m" '
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fill 0 1 2 3 4 5 >one &&
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