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b4dc085a8d
The logic for pulling into an unborn branch was originally designed to be used on a newly-initialized repository (d09e79c, git-pull: allow pulling into an empty repository, 2006-11-16). It thus did not initially deal with uncommitted changes in the unborn branch. The case of an _unstaged_ untracked file was fixed by4b3ffe5(pull: do not clobber untracked files on initial pull, 2011-03-25). However, it still clobbered existing staged files, both when the file exists in the merged commit (it will be overwritten), and when it does not (it will be deleted). We fix this by doing a two-way merge, where the "current" side of the merge is an empty tree, and the "target" side is HEAD (already updated to FETCH_HEAD at this point). This amounts to claiming that all work in the index was done vs. an empty tree, and thus all content of the index is precious. Note that this use of read-tree just gives us protection against overwriting index and working tree changes. It will not actually result in a 3-way merge conflict in the index. This is fine, as this is a rare situation, and the conflict would not be interesting anyway (it must, by definition, be an add/add conflict with the whole content conflicting). And it makes it simpler for the user to recover, as they have no HEAD to "git reset" back to. Reported-by: Stefan Schüßler <mail@stefanschuessler.de> Signed-off-by: Thomas Rast <trast@inf.ethz.ch> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
299 lines
7.9 KiB
Bash
Executable file
299 lines
7.9 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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# Fetch one or more remote refs and merge it/them into the current HEAD.
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USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
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LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
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SUBDIRECTORY_OK=Yes
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OPTIONS_SPEC=
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. git-sh-setup
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. git-sh-i18n
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set_reflog_action "pull${1+ $*}"
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require_work_tree_exists
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cd_to_toplevel
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die_conflict () {
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git diff-index --cached --name-status -r --ignore-submodules HEAD --
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if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
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die "$(gettext "Pull is not possible because you have unmerged files.
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Please, fix them up in the work tree, and then use 'git add/rm <file>'
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as appropriate to mark resolution, or use 'git commit -a'.")"
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else
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die "$(gettext "Pull is not possible because you have unmerged files.")"
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fi
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}
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die_merge () {
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if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
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die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
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Please, commit your changes before you can merge.")"
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else
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die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
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fi
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}
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test -z "$(git ls-files -u)" || die_conflict
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test -f "$GIT_DIR/MERGE_HEAD" && die_merge
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strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
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log_arg= verbosity= progress= recurse_submodules=
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merge_args= edit=
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curr_branch=$(git symbolic-ref -q HEAD)
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curr_branch_short="${curr_branch#refs/heads/}"
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rebase=$(git config --bool branch.$curr_branch_short.rebase)
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if test -z "$rebase"
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then
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rebase=$(git config --bool pull.rebase)
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fi
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dry_run=
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while :
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do
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case "$1" in
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-q|--quiet)
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verbosity="$verbosity -q" ;;
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-v|--verbose)
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verbosity="$verbosity -v" ;;
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--progress)
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progress=--progress ;;
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--no-progress)
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progress=--no-progress ;;
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-n|--no-stat|--no-summary)
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diffstat=--no-stat ;;
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--stat|--summary)
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diffstat=--stat ;;
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--log|--no-log)
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log_arg=$1 ;;
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--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
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no_commit=--no-commit ;;
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--c|--co|--com|--comm|--commi|--commit)
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no_commit=--commit ;;
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-e|--edit)
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edit=--edit ;;
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--no-edit)
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edit=--no-edit ;;
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--sq|--squ|--squa|--squas|--squash)
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squash=--squash ;;
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--no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
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squash=--no-squash ;;
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--ff)
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no_ff=--ff ;;
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--no-ff)
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no_ff=--no-ff ;;
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--ff-only)
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ff_only=--ff-only ;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$1" in
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*,*=*)
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strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
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1,*)
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usage ;;
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*)
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strategy="$2"
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shift ;;
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esac
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strategy_args="${strategy_args}-s $strategy "
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;;
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-X*)
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case "$#,$1" in
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1,-X)
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usage ;;
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*,-X)
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xx="-X $(git rev-parse --sq-quote "$2")"
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shift ;;
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*,*)
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xx=$(git rev-parse --sq-quote "$1") ;;
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esac
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merge_args="$merge_args$xx "
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;;
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-r|--r|--re|--reb|--reba|--rebas|--rebase)
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rebase=true
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;;
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--no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
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rebase=false
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;;
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--recurse-submodules)
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recurse_submodules=--recurse-submodules
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;;
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--recurse-submodules=*)
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recurse_submodules="$1"
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;;
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--no-recurse-submodules)
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recurse_submodules=--no-recurse-submodules
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;;
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--d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
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dry_run=--dry-run
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;;
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-h|--help-all)
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usage
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;;
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*)
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# Pass thru anything that may be meant for fetch.
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break
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;;
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esac
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shift
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done
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error_on_no_merge_candidates () {
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exec >&2
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for opt
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do
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case "$opt" in
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-t|--t|--ta|--tag|--tags)
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echo "Fetching tags only, you probably meant:"
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echo " git fetch --tags"
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exit 1
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esac
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done
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if test true = "$rebase"
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then
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op_type=rebase
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op_prep=against
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else
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op_type=merge
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op_prep=with
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fi
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curr_branch=${curr_branch#refs/heads/}
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upstream=$(git config "branch.$curr_branch.merge")
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remote=$(git config "branch.$curr_branch.remote")
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if [ $# -gt 1 ]; then
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if [ "$rebase" = true ]; then
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printf "There is no candidate for rebasing against "
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else
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printf "There are no candidates for merging "
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fi
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echo "among the refs that you just fetched."
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echo "Generally this means that you provided a wildcard refspec which had no"
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echo "matches on the remote end."
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elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
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echo "You asked to pull from the remote '$1', but did not specify"
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echo "a branch. Because this is not the default configured remote"
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echo "for your current branch, you must specify a branch on the command line."
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elif [ -z "$curr_branch" -o -z "$upstream" ]; then
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. git-parse-remote
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error_on_missing_default_upstream "pull" $op_type $op_prep \
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"git pull <remote> <branch>"
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else
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echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
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echo "from the remote, but no such ref was fetched."
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fi
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exit 1
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}
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test true = "$rebase" && {
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if ! git rev-parse -q --verify HEAD >/dev/null
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then
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# On an unborn branch
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if test -f "$GIT_DIR/index"
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then
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die "$(gettext "updating an unborn branch with changes added to the index")"
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fi
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else
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require_clean_work_tree "pull with rebase" "Please commit or stash them."
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fi
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oldremoteref= &&
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test -n "$curr_branch" &&
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. git-parse-remote &&
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remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
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oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
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for reflog in $(git rev-list -g $remoteref 2>/dev/null)
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do
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if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
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then
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oldremoteref="$reflog"
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break
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fi
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done
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}
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orig_head=$(git rev-parse -q --verify HEAD)
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git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
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test -z "$dry_run" || exit 0
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curr_head=$(git rev-parse -q --verify HEAD)
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if test -n "$orig_head" && test "$curr_head" != "$orig_head"
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then
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# The fetch involved updating the current branch.
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# The working tree and the index file is still based on the
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# $orig_head commit, but we are merging into $curr_head.
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# First update the working tree to match $curr_head.
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eval_gettextln "Warning: fetch updated the current branch head.
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Warning: fast-forwarding your working tree from
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Warning: commit \$orig_head." >&2
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git update-index -q --refresh
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git read-tree -u -m "$orig_head" "$curr_head" ||
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die "$(eval_gettext "Cannot fast-forward your working tree.
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After making sure that you saved anything precious from
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$ git diff \$orig_head
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output, run
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$ git reset --hard
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to recover.")"
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fi
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merge_head=$(sed -e '/ not-for-merge /d' \
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-e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
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tr '\012' ' ')
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case "$merge_head" in
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'')
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error_on_no_merge_candidates "$@"
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;;
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?*' '?*)
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if test -z "$orig_head"
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then
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die "$(gettext "Cannot merge multiple branches into empty head")"
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fi
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if test true = "$rebase"
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then
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die "$(gettext "Cannot rebase onto multiple branches")"
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fi
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;;
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esac
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# Pulling into unborn branch: a shorthand for branching off
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# FETCH_HEAD, for lazy typers.
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if test -z "$orig_head"
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then
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# Two-way merge: we claim the index is based on an empty tree,
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# and try to fast-forward to HEAD. This ensures we will not
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# lose index/worktree changes that the user already made on
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# the unborn branch.
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empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
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git read-tree -m -u $empty_tree $merge_head &&
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git update-ref -m "initial pull" HEAD $merge_head "$curr_head"
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exit
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fi
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if test true = "$rebase"
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then
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o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
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if test "$oldremoteref" = "$o"
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then
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unset oldremoteref
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fi
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fi
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merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
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case "$rebase" in
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true)
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eval="git-rebase $diffstat $strategy_args $merge_args $verbosity"
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eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
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;;
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*)
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eval="git-merge $diffstat $no_commit $edit $squash $no_ff $ff_only"
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eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
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eval="$eval \"\$merge_name\" HEAD $merge_head"
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;;
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esac
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eval "exec $eval"
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