#!/bin/sh # # Copyright (c) 2005 Junio C Hamano # # Fetch one or more remote refs and merge it/them into the current HEAD. USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [] ...' LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.' SUBDIRECTORY_OK=Yes OPTIONS_SPEC= . git-sh-setup set_reflog_action "pull $*" require_work_tree cd_to_toplevel die_conflict () { git diff-index --cached --name-status -r --ignore-submodules HEAD -- if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then die "Pull is not possible because you have unmerged files. Please, fix them up in the work tree, and then use 'git add/rm ' as appropriate to mark resolution, or use 'git commit -a'." else die "Pull is not possible because you have unmerged files." fi } die_merge () { if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then die "You have not concluded your merge (MERGE_HEAD exists). Please, commit your changes before you can merge." else die "You have not concluded your merge (MERGE_HEAD exists)." fi } test -z "$(git ls-files -u)" || die_conflict test -f "$GIT_DIR/MERGE_HEAD" && die_merge strategy_args= diffstat= no_commit= squash= no_ff= ff_only= log_arg= verbosity= merge_args= curr_branch=$(git symbolic-ref -q HEAD) curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||") rebase=$(git config --bool branch.$curr_branch_short.rebase) while : do case "$1" in -q|--quiet) verbosity="$verbosity -q" ;; -v|--verbose) verbosity="$verbosity -v" ;; -n|--no-stat|--no-summary) diffstat=--no-stat ;; --stat|--summary) diffstat=--stat ;; --log|--no-log) log_arg=$1 ;; --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit) no_commit=--no-commit ;; --c|--co|--com|--comm|--commi|--commit) no_commit=--commit ;; --sq|--squ|--squa|--squas|--squash) squash=--squash ;; --no-sq|--no-squ|--no-squa|--no-squas|--no-squash) squash=--no-squash ;; --ff) no_ff=--ff ;; --no-ff) no_ff=--no-ff ;; --ff-only) ff_only=--ff-only ;; -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\ --strateg=*|--strategy=*|\ -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy) case "$#,$1" in *,*=*) strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;; 1,*) usage ;; *) strategy="$2" shift ;; esac strategy_args="${strategy_args}-s $strategy " ;; -X*) case "$#,$1" in 1,-X) usage ;; *,-X) xx="-X $(git rev-parse --sq-quote "$2")" shift ;; *,*) xx=$(git rev-parse --sq-quote "$1") ;; esac merge_args="$merge_args$xx " ;; -r|--r|--re|--reb|--reba|--rebas|--rebase) rebase=true ;; --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase) rebase=false ;; -h|--h|--he|--hel|--help) usage ;; *) # Pass thru anything that may be meant for fetch. break ;; esac shift done error_on_no_merge_candidates () { exec >&2 for opt do case "$opt" in -t|--t|--ta|--tag|--tags) echo "Fetching tags only, you probably meant:" echo " git fetch --tags" exit 1 esac done if test true = "$rebase" then op_type=rebase op_prep=against else op_type=merge op_prep=with fi curr_branch=${curr_branch#refs/heads/} upstream=$(git config "branch.$curr_branch.merge") remote=$(git config "branch.$curr_branch.remote") if [ $# -gt 1 ]; then if [ "$rebase" = true ]; then printf "There is no candidate for rebasing against " else printf "There are no candidates for merging " fi echo "among the refs that you just fetched." echo "Generally this means that you provided a wildcard refspec which had no" echo "matches on the remote end." elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then echo "You asked to pull from the remote '$1', but did not specify" echo "a branch. Because this is not the default configured remote" echo "for your current branch, you must specify a branch on the command line." elif [ -z "$curr_branch" ]; then echo "You are not currently on a branch, so I cannot use any" echo "'branch..merge' in your configuration file." echo "Please specify which remote branch you want to use on the command" echo "line and try again (e.g. 'git pull ')." echo "See git-pull(1) for details." elif [ -z "$upstream" ]; then echo "You asked me to pull without telling me which branch you" echo "want to $op_type $op_prep, and 'branch.${curr_branch}.merge' in" echo "your configuration file does not tell me, either. Please" echo "specify which branch you want to use on the command line and" echo "try again (e.g. 'git pull ')." echo "See git-pull(1) for details." echo echo "If you often $op_type $op_prep the same branch, you may want to" echo "use something like the following in your configuration file:" echo echo " [branch \"${curr_branch}\"]" echo " remote = " echo " merge = " test rebase = "$op_type" && echo " rebase = true" echo echo " [remote \"\"]" echo " url = " echo " fetch = " echo echo "See git-config(1) for details." else echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'" echo "from the remote, but no such ref was fetched." fi exit 1 } test true = "$rebase" && { if ! git rev-parse -q --verify HEAD >/dev/null then # On an unborn branch if test -f "$GIT_DIR/index" then die "updating an unborn branch with changes added to the index" fi else git update-index --ignore-submodules --refresh && git diff-files --ignore-submodules --quiet && git diff-index --ignore-submodules --cached --quiet HEAD -- || die "refusing to pull with rebase: your working tree is not up-to-date" fi oldremoteref= && . git-parse-remote && remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" && oldremoteref="$(git rev-parse -q --verify "$remoteref")" && for reflog in $(git rev-list -g $remoteref 2>/dev/null) do if test "$reflog" = "$(git merge-base $reflog $curr_branch)" then oldremoteref="$reflog" break fi done } orig_head=$(git rev-parse -q --verify HEAD) git fetch $verbosity --update-head-ok "$@" || exit 1 curr_head=$(git rev-parse -q --verify HEAD) if test -n "$orig_head" && test "$curr_head" != "$orig_head" then # The fetch involved updating the current branch. # The working tree and the index file is still based on the # $orig_head commit, but we are merging into $curr_head. # First update the working tree to match $curr_head. echo >&2 "Warning: fetch updated the current branch head." echo >&2 "Warning: fast-forwarding your working tree from" echo >&2 "Warning: commit $orig_head." git update-index -q --refresh git read-tree -u -m "$orig_head" "$curr_head" || die 'Cannot fast-forward your working tree. After making sure that you saved anything precious from $ git diff '$orig_head' output, run $ git reset --hard to recover.' fi merge_head=$(sed -e '/ not-for-merge /d' \ -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \ tr '\012' ' ') case "$merge_head" in '') error_on_no_merge_candidates "$@" ;; ?*' '?*) if test -z "$orig_head" then die "Cannot merge multiple branches into empty head" fi if test true = "$rebase" then die "Cannot rebase onto multiple branches" fi ;; esac if test -z "$orig_head" then git update-ref -m "initial pull" HEAD $merge_head "$curr_head" && git read-tree --reset -u HEAD || exit 1 exit fi merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit case "$rebase" in true) eval="git-rebase $diffstat $strategy_args $merge_args" eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}" ;; *) eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only" eval="$eval $log_arg $strategy_args $merge_args" eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity" ;; esac eval "exec $eval"