Andrew's git / gitweb.git / git-pull.sh
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git-pull.shon commit Merge branch 'bg/apply-doc' (d2cd665)
   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= diffstat= no_commit= squash= no_ff= ff_only=
  20log_arg= verbosity=
  21curr_branch=$(git symbolic-ref -q HEAD)
  22curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
  23rebase=$(git config --bool branch.$curr_branch_short.rebase)
  24while :
  25do
  26        case "$1" in
  27        -q|--quiet)
  28                verbosity="$verbosity -q" ;;
  29        -v|--verbose)
  30                verbosity="$verbosity -v" ;;
  31        -n|--no-stat|--no-summary)
  32                diffstat=--no-stat ;;
  33        --stat|--summary)
  34                diffstat=--stat ;;
  35        --log|--no-log)
  36                log_arg=$1 ;;
  37        --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  38                no_commit=--no-commit ;;
  39        --c|--co|--com|--comm|--commi|--commit)
  40                no_commit=--commit ;;
  41        --sq|--squ|--squa|--squas|--squash)
  42                squash=--squash ;;
  43        --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  44                squash=--no-squash ;;
  45        --ff)
  46                no_ff=--ff ;;
  47        --no-ff)
  48                no_ff=--no-ff ;;
  49        --ff-only)
  50                ff_only=--ff-only ;;
  51        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  52                --strateg=*|--strategy=*|\
  53        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  54                case "$#,$1" in
  55                *,*=*)
  56                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  57                1,*)
  58                        usage ;;
  59                *)
  60                        strategy="$2"
  61                        shift ;;
  62                esac
  63                strategy_args="${strategy_args}-s $strategy "
  64                ;;
  65        -r|--r|--re|--reb|--reba|--rebas|--rebase)
  66                rebase=true
  67                ;;
  68        --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  69                rebase=false
  70                ;;
  71        -h|--h|--he|--hel|--help)
  72                usage
  73                ;;
  74        *)
  75                # Pass thru anything that may be meant for fetch.
  76                break
  77                ;;
  78        esac
  79        shift
  80done
  81
  82error_on_no_merge_candidates () {
  83        exec >&2
  84        for opt
  85        do
  86                case "$opt" in
  87                -t|--t|--ta|--tag|--tags)
  88                        echo "Fetching tags only, you probably meant:"
  89                        echo "  git fetch --tags"
  90                        exit 1
  91                esac
  92        done
  93
  94        curr_branch=${curr_branch#refs/heads/}
  95        upstream=$(git config "branch.$curr_branch.merge")
  96        remote=$(git config "branch.$curr_branch.remote")
  97
  98        if [ $# -gt 1 ]; then
  99                echo "There are no candidates for merging in the refs that you just fetched."
 100                echo "Generally this means that you provided a wildcard refspec which had no"
 101                echo "matches on the remote end."
 102        elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 103                echo "You asked to pull from the remote '$1', but did not specify"
 104                echo "a branch to merge. Because this is not the default configured remote"
 105                echo "for your current branch, you must specify a branch on the command line."
 106        elif [ -z "$curr_branch" ]; then
 107                echo "You are not currently on a branch, so I cannot use any"
 108                echo "'branch.<branchname>.merge' in your configuration file."
 109                echo "Please specify which branch you want to merge on the command"
 110                echo "line and try again (e.g. 'git pull <repository> <refspec>')."
 111                echo "See git-pull(1) for details."
 112        elif [ -z "$upstream" ]; then
 113                echo "You asked me to pull without telling me which branch you"
 114                echo "want to merge with, and 'branch.${curr_branch}.merge' in"
 115                echo "your configuration file does not tell me either.  Please"
 116                echo "specify which branch you want to merge on the command line and"
 117                echo "try again (e.g. 'git pull <repository> <refspec>')."
 118                echo "See git-pull(1) for details."
 119                echo
 120                echo "If you often merge with the same branch, you may want to"
 121                echo "configure the following variables in your configuration"
 122                echo "file:"
 123                echo
 124                echo "    branch.${curr_branch}.remote = <nickname>"
 125                echo "    branch.${curr_branch}.merge = <remote-ref>"
 126                echo "    remote.<nickname>.url = <url>"
 127                echo "    remote.<nickname>.fetch = <refspec>"
 128                echo
 129                echo "See git-config(1) for details."
 130        else
 131                echo "Your configuration specifies to merge the ref '${upstream#refs/heads/}' from the"
 132                echo "remote, but no such ref was fetched."
 133        fi
 134        exit 1
 135}
 136
 137test true = "$rebase" && {
 138        if ! git rev-parse -q --verify HEAD >/dev/null
 139        then
 140                # On an unborn branch
 141                if test -f "$GIT_DIR/index"
 142                then
 143                        die "updating an unborn branch with changes added to the index"
 144                fi
 145        else
 146                git update-index --ignore-submodules --refresh &&
 147                git diff-files --ignore-submodules --quiet &&
 148                git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 149                die "refusing to pull with rebase: your working tree is not up-to-date"
 150        fi
 151        oldremoteref= &&
 152        . git-parse-remote &&
 153        remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 154        oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 155        for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 156        do
 157                if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 158                then
 159                        oldremoteref="$reflog"
 160                        break
 161                fi
 162        done
 163}
 164orig_head=$(git rev-parse -q --verify HEAD)
 165git fetch $verbosity --update-head-ok "$@" || exit 1
 166
 167curr_head=$(git rev-parse -q --verify HEAD)
 168if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 169then
 170        # The fetch involved updating the current branch.
 171
 172        # The working tree and the index file is still based on the
 173        # $orig_head commit, but we are merging into $curr_head.
 174        # First update the working tree to match $curr_head.
 175
 176        echo >&2 "Warning: fetch updated the current branch head."
 177        echo >&2 "Warning: fast-forwarding your working tree from"
 178        echo >&2 "Warning: commit $orig_head."
 179        git update-index -q --refresh
 180        git read-tree -u -m "$orig_head" "$curr_head" ||
 181                die 'Cannot fast-forward your working tree.
 182After making sure that you saved anything precious from
 183$ git diff '$orig_head'
 184output, run
 185$ git reset --hard
 186to recover.'
 187
 188fi
 189
 190merge_head=$(sed -e '/  not-for-merge   /d' \
 191        -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 192        tr '\012' ' ')
 193
 194case "$merge_head" in
 195'')
 196        error_on_no_merge_candidates "$@"
 197        ;;
 198?*' '?*)
 199        if test -z "$orig_head"
 200        then
 201                die "Cannot merge multiple branches into empty head"
 202        fi
 203        if test true = "$rebase"
 204        then
 205                die "Cannot rebase onto multiple branches"
 206        fi
 207        ;;
 208esac
 209
 210if test -z "$orig_head"
 211then
 212        git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 213        git read-tree --reset -u HEAD || exit 1
 214        exit
 215fi
 216
 217merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 218test true = "$rebase" &&
 219        exec git-rebase $diffstat $strategy_args --onto $merge_head \
 220        ${oldremoteref:-$merge_head}
 221exec git-merge $diffstat $no_commit $squash $no_ff $ff_only $log_arg $strategy_args \
 222        "$merge_name" HEAD $merge_head $verbosity