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138 lines
3.2 KiB
138 lines
3.2 KiB
#!/bin/sh |
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. git-sh-setup || die "Not a git archive" |
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usage () { |
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die "usage: git checkout [-f] [-b <new_branch>] [<branch>] [<paths>...]" |
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} |
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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 $newbranch already exists" |
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git-check-ref-format "heads/$newbranch" || |
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die "we do not like '$newbranch' as a branch name." |
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;; |
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"-f") |
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force=1 |
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;; |
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--) |
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break |
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;; |
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-*) |
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usage |
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;; |
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*) |
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if rev=$(git-rev-parse --verify "$arg^0" 2>/dev/null) |
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then |
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if [ -z "$rev" ]; then |
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echo "unknown flag $arg" |
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exit 1 |
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fi |
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new="$rev" |
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if [ -f "$GIT_DIR/refs/heads/$arg" ]; then |
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branch="$arg" |
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fi |
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elif rev=$(git-rev-parse --verify "$arg^{tree}" 2>/dev/null) |
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then |
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# checking out selected paths from a tree-ish. |
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new="$rev" |
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branch= |
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else |
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new= |
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branch= |
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set x "$arg" "$@" |
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shift |
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fi |
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break |
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;; |
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esac |
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done |
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# The behaviour of the command with and without explicit path |
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# parameters is quite different. |
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# |
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# Without paths, we are checking out everything in the work tree, |
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# possibly switching branches. This is the traditional behaviour. |
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# |
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# With paths, we are _never_ switching branch, but checking out |
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# the named paths from either index (when no rev is given), |
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# or the named tree-ish (when rev is given). |
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if test "$#" -ge 1 |
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then |
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if test '' != "$newbranch$force" |
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then |
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die "updating paths and switching branches or forcing are incompatible." |
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fi |
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if test '' != "$new" |
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then |
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# from a specific tree-ish; note that this is for |
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# rescuing paths and is never meant to remove what |
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# is not in the named tree-ish. |
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git-ls-tree -r "$new" "$@" | |
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git-update-index --index-info || exit $? |
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fi |
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git-checkout-index -f -u -- "$@" |
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exit $? |
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else |
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# Make sure we did not fall back on $arg^{tree} codepath |
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# since we are not checking out from an arbitrary tree-ish, |
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# but switching branches. |
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if test '' != "$new" |
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then |
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git-rev-parse --verify "$new^{commit}" >/dev/null 2>&1 || |
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die "Cannot switch branch to a non-commit." |
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fi |
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fi |
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[ -z "$new" ] && new=$old |
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# If we don't have an old branch that we're switching to, |
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# and we don't have a new branch name for the target we |
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# are switching to, then we'd better just be checking out |
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# what we already had |
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[ -z "$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-update-index --refresh >/dev/null |
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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 [ "$newbranch" ]; then |
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leading=`expr "refs/heads/$newbranch" : '\(.*\)/'` && |
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mkdir -p "$GIT_DIR/$leading" && |
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echo $new >"$GIT_DIR/refs/heads/$newbranch" || exit |
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branch="$newbranch" |
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fi |
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[ "$branch" ] && |
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GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD "refs/heads/$branch" |
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rm -f "$GIT_DIR/MERGE_HEAD" |
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else |
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exit 1 |
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fi
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