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
  16
  17die_conflict () {
  18    git diff-index --cached --name-status -r --ignore-submodules HEAD --
  19    if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  20        die "Pull is not possible because you have unmerged files.
  21Please, fix them up in the work tree, and then use 'git add/rm <file>'
  22as appropriate to mark resolution, or use 'git commit -a'."
  23    else
  24        die "Pull is not possible because you have unmerged files."
  25    fi
  26}
  27
  28die_merge () {
  29    if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
  30        die "You have not concluded your merge (MERGE_HEAD exists).
  31Please, commit your changes before you can merge."
  32    else
  33        die "You have not concluded your merge (MERGE_HEAD exists)."
  34    fi
  35}
  36
  37test -z "$(git ls-files -u)" || die_conflict
  38test -f "$GIT_DIR/MERGE_HEAD" && die_merge
  39
  40strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
  41log_arg= verbosity= progress=
  42merge_args=
  43curr_branch=$(git symbolic-ref -q HEAD)
  44curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
  45rebase=$(git config --bool branch.$curr_branch_short.rebase)
  46while :
  47do
  48        case "$1" in
  49        -q|--quiet)
  50                verbosity="$verbosity -q" ;;
  51        -v|--verbose)
  52                verbosity="$verbosity -v" ;;
  53        --progress)
  54                progress=--progress ;;
  55        -n|--no-stat|--no-summary)
  56                diffstat=--no-stat ;;
  57        --stat|--summary)
  58                diffstat=--stat ;;
  59        --log|--no-log)
  60                log_arg=$1 ;;
  61        --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  62                no_commit=--no-commit ;;
  63        --c|--co|--com|--comm|--commi|--commit)
  64                no_commit=--commit ;;
  65        --sq|--squ|--squa|--squas|--squash)
  66                squash=--squash ;;
  67        --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  68                squash=--no-squash ;;
  69        --ff)
  70                no_ff=--ff ;;
  71        --no-ff)
  72                no_ff=--no-ff ;;
  73        --ff-only)
  74                ff_only=--ff-only ;;
  75        -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  76                --strateg=*|--strategy=*|\
  77        -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  78                case "$#,$1" in
  79                *,*=*)
  80                        strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  81                1,*)
  82                        usage ;;
  83                *)
  84                        strategy="$2"
  85                        shift ;;
  86                esac
  87                strategy_args="${strategy_args}-s $strategy "
  88                ;;
  89        -X*)
  90                case "$#,$1" in
  91                1,-X)
  92                        usage ;;
  93                *,-X)
  94                        xx="-X $(git rev-parse --sq-quote "$2")"
  95                        shift ;;
  96                *,*)
  97                        xx=$(git rev-parse --sq-quote "$1") ;;
  98                esac
  99                merge_args="$merge_args$xx "
 100                ;;
 101        -r|--r|--re|--reb|--reba|--rebas|--rebase)
 102                rebase=true
 103                ;;
 104        --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
 105                rebase=false
 106                ;;
 107        -h|--h|--he|--hel|--help)
 108                usage
 109                ;;
 110        *)
 111                # Pass thru anything that may be meant for fetch.
 112                break
 113                ;;
 114        esac
 115        shift
 116done
 117
 118error_on_no_merge_candidates () {
 119        exec >&2
 120        for opt
 121        do
 122                case "$opt" in
 123                -t|--t|--ta|--tag|--tags)
 124                        echo "Fetching tags only, you probably meant:"
 125                        echo "  git fetch --tags"
 126                        exit 1
 127                esac
 128        done
 129
 130        if test true = "$rebase"
 131        then
 132                op_type=rebase
 133                op_prep=against
 134        else
 135                op_type=merge
 136                op_prep=with
 137        fi
 138
 139        curr_branch=${curr_branch#refs/heads/}
 140        upstream=$(git config "branch.$curr_branch.merge")
 141        remote=$(git config "branch.$curr_branch.remote")
 142
 143        if [ $# -gt 1 ]; then
 144                if [ "$rebase" = true ]; then
 145                        printf "There is no candidate for rebasing against "
 146                else
 147                        printf "There are no candidates for merging "
 148                fi
 149                echo "among the refs that you just fetched."
 150                echo "Generally this means that you provided a wildcard refspec which had no"
 151                echo "matches on the remote end."
 152        elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
 153                echo "You asked to pull from the remote '$1', but did not specify"
 154                echo "a branch. Because this is not the default configured remote"
 155                echo "for your current branch, you must specify a branch on the command line."
 156        elif [ -z "$curr_branch" ]; then
 157                echo "You are not currently on a branch, so I cannot use any"
 158                echo "'branch.<branchname>.merge' in your configuration file."
 159                echo "Please specify which remote branch you want to use on the command"
 160                echo "line and try again (e.g. 'git pull <repository> <refspec>')."
 161                echo "See git-pull(1) for details."
 162        elif [ -z "$upstream" ]; then
 163                echo "You asked me to pull without telling me which branch you"
 164                echo "want to $op_type $op_prep, and 'branch.${curr_branch}.merge' in"
 165                echo "your configuration file does not tell me, either. Please"
 166                echo "specify which branch you want to use on the command line and"
 167                echo "try again (e.g. 'git pull <repository> <refspec>')."
 168                echo "See git-pull(1) for details."
 169                echo
 170                echo "If you often $op_type $op_prep the same branch, you may want to"
 171                echo "use something like the following in your configuration file:"
 172                echo
 173                echo "    [branch \"${curr_branch}\"]"
 174                echo "    remote = <nickname>"
 175                echo "    merge = <remote-ref>"
 176                test rebase = "$op_type" &&
 177                        echo "    rebase = true"
 178                echo
 179                echo "    [remote \"<nickname>\"]"
 180                echo "    url = <url>"
 181                echo "    fetch = <refspec>"
 182                echo
 183                echo "See git-config(1) for details."
 184        else
 185                echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
 186                echo "from the remote, but no such ref was fetched."
 187        fi
 188        exit 1
 189}
 190
 191test true = "$rebase" && {
 192        if ! git rev-parse -q --verify HEAD >/dev/null
 193        then
 194                # On an unborn branch
 195                if test -f "$GIT_DIR/index"
 196                then
 197                        die "updating an unborn branch with changes added to the index"
 198                fi
 199        else
 200                git update-index --ignore-submodules --refresh &&
 201                git diff-files --ignore-submodules --quiet &&
 202                git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 203                die "refusing to pull with rebase: your working tree is not up-to-date"
 204        fi
 205        oldremoteref= &&
 206        . git-parse-remote &&
 207        remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 208        oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 209        for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 210        do
 211                if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 212                then
 213                        oldremoteref="$reflog"
 214                        break
 215                fi
 216        done
 217}
 218orig_head=$(git rev-parse -q --verify HEAD)
 219git fetch $verbosity $progress --update-head-ok "$@" || exit 1
 220
 221curr_head=$(git rev-parse -q --verify HEAD)
 222if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 223then
 224        # The fetch involved updating the current branch.
 225
 226        # The working tree and the index file is still based on the
 227        # $orig_head commit, but we are merging into $curr_head.
 228        # First update the working tree to match $curr_head.
 229
 230        echo >&2 "Warning: fetch updated the current branch head."
 231        echo >&2 "Warning: fast-forwarding your working tree from"
 232        echo >&2 "Warning: commit $orig_head."
 233        git update-index -q --refresh
 234        git read-tree -u -m "$orig_head" "$curr_head" ||
 235                die 'Cannot fast-forward your working tree.
 236After making sure that you saved anything precious from
 237$ git diff '$orig_head'
 238output, run
 239$ git reset --hard
 240to recover.'
 241
 242fi
 243
 244merge_head=$(sed -e '/  not-for-merge   /d' \
 245        -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 246        tr '\012' ' ')
 247
 248case "$merge_head" in
 249'')
 250        error_on_no_merge_candidates "$@"
 251        ;;
 252?*' '?*)
 253        if test -z "$orig_head"
 254        then
 255                die "Cannot merge multiple branches into empty head"
 256        fi
 257        if test true = "$rebase"
 258        then
 259                die "Cannot rebase onto multiple branches"
 260        fi
 261        ;;
 262esac
 263
 264if test -z "$orig_head"
 265then
 266        git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 267        git read-tree --reset -u HEAD || exit 1
 268        exit
 269fi
 270
 271merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 272case "$rebase" in
 273true)
 274        eval="git-rebase $diffstat $strategy_args $merge_args"
 275        eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
 276        ;;
 277*)
 278        eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
 279        eval="$eval  $log_arg $strategy_args $merge_args"
 280        eval="$eval \"\$merge_name\" HEAD $merge_head $verbosity"
 281        ;;
 282esac
 283eval "exec $eval"