1be0659efc
* Instead of going interactive, introduce a command line switch '-m' to allow merging changes when normal two-way merge by read-tree prevents branch switching. * Leave the unmerged stages intact if automerge fails, but reset index entries of cleanly merged paths to that of the new branch, so that "git diff" (not "git diff HEAD") would show the local modifications. * Swap the order of trees in read-tree three-way merge used in the fallback, so that `git diff` to show the conflicts become more natural. * Describe the new option and give more examples in the documentation. Signed-off-by: Junio C Hamano <junkio@cox.net>
188 lines
4.3 KiB
Bash
Executable File
188 lines
4.3 KiB
Bash
Executable File
#!/bin/sh
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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=$(git-rev-parse HEAD)
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new=
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force=
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branch=
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newbranch=
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merge=
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while [ "$#" != "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 '$newbranch' as a branch name."
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;;
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"-f")
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force=1
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;;
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-m)
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merge=1
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;;
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--)
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break
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;;
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-*)
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usage
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;;
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*)
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if rev=$(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$force$merge"
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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 '' != "$new"
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then
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# from a specific tree-ish; note that this is for
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# rescuing paths and is never meant to remove what
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# is not in the named tree-ish.
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git-ls-tree --full-name -r "$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 "$new^{commit}" >/dev/null 2>&1 ||
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die "Cannot switch branch to a non-commit."
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fi
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fi
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# We are switching branches and checking out trees, so
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# we *NEED* to be at the toplevel.
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cdup=$(git-rev-parse --show-cdup)
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if test ! -z "$cdup"
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then
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cd "$cdup"
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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 $new &&
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git-checkout-index -q -f -u -a
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else
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git-update-index --refresh >/dev/null
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merge_error=$(git-read-tree -m -u $old $new 2>&1) || (
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case "$merge" in
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'')
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echo >&2 "$merge_error"
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exit 1 ;;
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esac
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# Match the index to the working tree, and do a three-way.
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git diff-files --name-only | git update-index --remove --stdin &&
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work=`git write-tree` &&
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git read-tree --reset $new &&
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git checkout-index -f -u -q -a &&
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git read-tree -m -u $old $new $work || exit
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if result=`git write-tree 2>/dev/null`
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then
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echo >&2 "Trivially automerged."
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else
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git merge-index -o git-merge-one-file -a
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fi
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# Do not register the cleanly merged paths in the index yet.
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# this is not a real merge before committing, but just carrying
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# the working tree changes along.
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unmerged=`git ls-files -u`
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git read-tree --reset $new
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case "$unmerged" in
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'') ;;
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*)
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(
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z40=0000000000000000000000000000000000000000
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echo "$unmerged" |
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sed -e 's/^[0-7]* [0-9a-f]* /'"0 $z40 /"
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echo "$unmerged"
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) | git update-index --index-info
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;;
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esac
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exit 0
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)
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fi
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#
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# Switch the HEAD pointer to the new branch if 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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