Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano
   4#
   5# Fetch one or more remote refs and merge it/them into the current HEAD.
   6
   7USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
   9SUBDIRECTORY_OK=Yes
  10OPTIONS_SPEC=
  11. git-sh-setup
  12set_reflog_action "pull $*"
  13require_work_tree
  14cd_to_toplevel
  15
  16test -z "$(git ls-files -u)" ||
  17        die "You are in the middle of a conflicted merge."
  18
  19strategy_args= no_stat= no_commit= squash= no_ff= log_arg= verbosity=
  20curr_branch=$(git symbolic-ref -q HEAD)
  21curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
  22rebase=$(git config --bool branch.$curr_branch_short.rebase)
  23while :
  24do
  25        case "$1" in
  26        -q|--quiet)
  27                verbosity="$verbosity -q" ;;
  28        -v|--verbose)
  29                verbosity="$verbosity -v" ;;
  30        -n|--no-stat|--no-summary)
  31                no_stat=-n ;;
  32        --stat|--summary)
  33                no_stat=$1 ;;
  34        --log|--no-log)
  35                log_arg=$1 ;;
  36        --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  37                no_commit=--no-commit ;;
  38        --c|--co|--com|--comm|--commi|--commit)
  39                no_commit=--commit ;;
  40        --sq|--squ|--squa|--squas|--squash)
  41                squash=--squash ;;
  42        --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  43                squash=--no-squash ;;
  44        --ff)
  45                no_ff=--ff ;;
  46        --no-ff)
  47                no_ff=--no-ff ;;
  48        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  49                --strateg=*|--strategy=*|\
  50        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  51                case "$#,$1" in
  52                *,*=*)
  53                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  54                1,*)
  55                        usage ;;
  56                *)
  57                        strategy="$2"
  58                        shift ;;
  59                esac
  60                strategy_args="${strategy_args}-s $strategy "
  61                ;;
  62        -r|--r|--re|--reb|--reba|--rebas|--rebase)
  63                rebase=true
  64                ;;
  65        --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  66                rebase=false
  67                ;;
  68        -h|--h|--he|--hel|--help)
  69                usage
  70                ;;
  71        *)
  72                # Pass thru anything that may be meant for fetch.
  73                break
  74                ;;
  75        esac
  76        shift
  77done
  78
  79error_on_no_merge_candidates () {
  80        exec >&2
  81        for opt
  82        do
  83                case "$opt" in
  84                -t|--t|--ta|--tag|--tags)
  85                        echo "Fetching tags only, you probably meant:"
  86                        echo "  git fetch --tags"
  87                        exit 1
  88                esac
  89        done
  90
  91        curr_branch=${curr_branch#refs/heads/}
  92
  93        echo "You asked me to pull without telling me which branch you"
  94        echo "want to merge with, and 'branch.${curr_branch}.merge' in"
  95        echo "your configuration file does not tell me either.  Please"
  96        echo "name which branch you want to merge on the command line and"
  97        echo "try again (e.g. 'git pull <repository> <refspec>')."
  98        echo "See git-pull(1) for details on the refspec."
  99        echo
 100        echo "If you often merge with the same branch, you may want to"
 101        echo "configure the following variables in your configuration"
 102        echo "file:"
 103        echo
 104        echo "    branch.${curr_branch}.remote = <nickname>"
 105        echo "    branch.${curr_branch}.merge = <remote-ref>"
 106        echo "    remote.<nickname>.url = <url>"
 107        echo "    remote.<nickname>.fetch = <refspec>"
 108        echo
 109        echo "See git-config(1) for details."
 110        exit 1
 111}
 112
 113test true = "$rebase" && {
 114        git update-index --ignore-submodules --refresh &&
 115        git diff-files --ignore-submodules --quiet &&
 116        git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 117        die "refusing to pull with rebase: your working tree is not up-to-date"
 118
 119        . git-parse-remote &&
 120        origin="$1"
 121        test -z "$origin" && origin=$(get_default_remote)
 122        reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
 123                sed "s|refs/heads/\(.*\):|\1|")" &&
 124        oldremoteref="$(git rev-parse -q --verify \
 125                "refs/remotes/$origin/$reflist")"
 126}
 127orig_head=$(git rev-parse -q --verify HEAD)
 128git fetch $verbosity --update-head-ok "$@" || exit 1
 129
 130curr_head=$(git rev-parse -q --verify HEAD)
 131if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 132then
 133        # The fetch involved updating the current branch.
 134
 135        # The working tree and the index file is still based on the
 136        # $orig_head commit, but we are merging into $curr_head.
 137        # First update the working tree to match $curr_head.
 138
 139        echo >&2 "Warning: fetch updated the current branch head."
 140        echo >&2 "Warning: fast forwarding your working tree from"
 141        echo >&2 "Warning: commit $orig_head."
 142        git update-index --refresh 2>/dev/null
 143        git read-tree -u -m "$orig_head" "$curr_head" ||
 144                die 'Cannot fast-forward your working tree.
 145After making sure that you saved anything precious from
 146$ git diff '$orig_head'
 147output, run
 148$ git reset --hard
 149to recover.'
 150
 151fi
 152
 153merge_head=$(sed -e '/  not-for-merge   /d' \
 154        -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 155        tr '\012' ' ')
 156
 157case "$merge_head" in
 158'')
 159        case $? in
 160        0) error_on_no_merge_candidates "$@";;
 161        1) echo >&2 "You are not currently on a branch; you must explicitly"
 162           echo >&2 "specify which branch you wish to merge:"
 163           echo >&2 "  git pull <remote> <branch>"
 164           exit 1;;
 165        *) exit $?;;
 166        esac
 167        ;;
 168?*' '?*)
 169        if test -z "$orig_head"
 170        then
 171                echo >&2 "Cannot merge multiple branches into empty head"
 172                exit 1
 173        fi
 174        ;;
 175esac
 176
 177if test -z "$orig_head"
 178then
 179        git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 180        git read-tree --reset -u HEAD || exit 1
 181        exit
 182fi
 183
 184merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 185test true = "$rebase" &&
 186        exec git-rebase $strategy_args --onto $merge_head \
 187        ${oldremoteref:-$merge_head}
 188exec git-merge $no_stat $no_commit $squash $no_ff $log_arg $strategy_args \
 189        "$merge_name" HEAD $merge_head $verbosity