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91dcdfd3b5
In particular, if we check out something that isn't an old branch, it now requires a new branch-name to check the thing out into. So, for example: git checkout -b my-branch v2.6.12 will create the new branch "my-branch", and start it at v2.6.12, while git checkout master will just switch back to the master branch. Of course, if you want to create a new branch "my-branch" and _not_ check it out, you could have done so with just git-rev-parse v2.6.12^0 > .git/refs/heads/my-branch which I think I will codify as "git branch".
76 lines
1.6 KiB
Bash
Executable File
76 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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. git-sh-setup-script || 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 --revs-only "$arg^0") || exit
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if [ -z "$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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i=$(($i+1))
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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-cache -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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fi
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