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76 lines
1.6 KiB
76 lines
1.6 KiB
#!/bin/sh |
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. git-sh-setup || die "Not a git archive" |
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old=$(git-rev-parse HEAD) |
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new= |
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force= |
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branch= |
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newbranch= |
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while [ "$#" != "0" ]; do |
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arg="$1" |
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shift |
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case "$arg" in |
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"-b") |
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newbranch="$1" |
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shift |
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[ -z "$newbranch" ] && |
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die "git checkout: -b needs a branch name" |
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[ -e "$GIT_DIR/refs/heads/$newbranch" ] && |
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die "git checkout: branch $newbranch already exists" |
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;; |
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"-f") |
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force=1 |
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;; |
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*) |
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rev=$(git-rev-parse --verify "$arg^0") || exit |
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if [ -z "$rev" ]; then |
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echo "unknown flag $arg" |
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exit 1 |
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fi |
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if [ "$new" ]; then |
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echo "Multiple revisions?" |
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exit 1 |
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fi |
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new="$rev" |
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if [ -f "$GIT_DIR/refs/heads/$arg" ]; then |
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branch="$arg" |
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fi |
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;; |
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esac |
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done |
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[ -z "$new" ] && new=$old |
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# |
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# If we don't have an old branch that we're switching to, |
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# and we don't have a new branch name for the target we |
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# are switching to, then we'd better just be checking out |
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# what we already had |
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# |
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[ -z "$branch$newbranch" ] && |
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[ "$new" != "$old" ] && |
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die "git checkout: you need to specify a new branch name" |
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if [ "$force" ] |
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then |
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git-read-tree --reset $new && |
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git-checkout-index -q -f -u -a |
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else |
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git-read-tree -m -u $old $new |
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fi |
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# |
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# Switch the HEAD pointer to the new branch if it we |
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# checked out a branch head, and remove any potential |
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# old MERGE_HEAD's (subsequent commits will clearly not |
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# be based on them, since we re-set the index) |
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# |
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if [ "$?" -eq 0 ]; then |
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if [ "$newbranch" ]; then |
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echo $new > "$GIT_DIR/refs/heads/$newbranch" |
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branch="$newbranch" |
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fi |
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[ "$branch" ] && ln -sf "refs/heads/$branch" "$GIT_DIR/HEAD" |
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rm -f "$GIT_DIR/MERGE_HEAD" |
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else |
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exit 1 |
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fi
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