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