Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2#
   3# This program resolves merge conflicts in git
   4#
   5# Copyright (c) 2006 Theodore Y. Ts'o
   6#
   7# This file is licensed under the GPL v2, or a later version
   8# at the discretion of Junio C Hamano.
   9#
  10
  11USAGE='[--tool=tool] [-y|--no-prompt|--prompt] [file to merge] ...'
  12SUBDIRECTORY_OK=Yes
  13OPTIONS_SPEC=
  14. git-sh-setup
  15require_work_tree
  16prefix=$(git rev-parse --show-prefix)
  17
  18# Returns true if the mode reflects a symlink
  19is_symlink () {
  20    test "$1" = 120000
  21}
  22
  23local_present () {
  24    test -n "$local_mode"
  25}
  26
  27remote_present () {
  28    test -n "$remote_mode"
  29}
  30
  31base_present () {
  32    test -n "$base_mode"
  33}
  34
  35cleanup_temp_files () {
  36    if test "$1" = --save-backup ; then
  37        mv -- "$BACKUP" "$MERGED.orig"
  38        rm -f -- "$LOCAL" "$REMOTE" "$BASE"
  39    else
  40        rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
  41    fi
  42}
  43
  44describe_file () {
  45    mode="$1"
  46    branch="$2"
  47    file="$3"
  48
  49    printf "  {%s}: " "$branch"
  50    if test -z "$mode"; then
  51        echo "deleted"
  52    elif is_symlink "$mode" ; then
  53        echo "a symbolic link -> '$(cat "$file")'"
  54    else
  55        if base_present; then
  56            echo "modified"
  57        else
  58            echo "created"
  59        fi
  60    fi
  61}
  62
  63
  64resolve_symlink_merge () {
  65    while true; do
  66        printf "Use (l)ocal or (r)emote, or (a)bort? "
  67        read ans
  68        case "$ans" in
  69            [lL]*)
  70                git checkout-index -f --stage=2 -- "$MERGED"
  71                git add -- "$MERGED"
  72                cleanup_temp_files --save-backup
  73                return 0
  74                ;;
  75            [rR]*)
  76                git checkout-index -f --stage=3 -- "$MERGED"
  77                git add -- "$MERGED"
  78                cleanup_temp_files --save-backup
  79                return 0
  80                ;;
  81            [aA]*)
  82                return 1
  83                ;;
  84            esac
  85        done
  86}
  87
  88resolve_deleted_merge () {
  89    while true; do
  90        if base_present; then
  91            printf "Use (m)odified or (d)eleted file, or (a)bort? "
  92        else
  93            printf "Use (c)reated or (d)eleted file, or (a)bort? "
  94        fi
  95        read ans
  96        case "$ans" in
  97            [mMcC]*)
  98                git add -- "$MERGED"
  99                cleanup_temp_files --save-backup
 100                return 0
 101                ;;
 102            [dD]*)
 103                git rm -- "$MERGED" > /dev/null
 104                cleanup_temp_files
 105                return 0
 106                ;;
 107            [aA]*)
 108                return 1
 109                ;;
 110            esac
 111        done
 112}
 113
 114check_unchanged () {
 115    if test "$MERGED" -nt "$BACKUP" ; then
 116        status=0;
 117    else
 118        while true; do
 119            echo "$MERGED seems unchanged."
 120            printf "Was the merge successful? [y/n] "
 121            read answer < /dev/tty
 122            case "$answer" in
 123                y*|Y*) status=0; break ;;
 124                n*|N*) status=1; break ;;
 125            esac
 126        done
 127    fi
 128}
 129
 130merge_file () {
 131    MERGED="$1"
 132
 133    f=`git ls-files -u -- "$MERGED"`
 134    if test -z "$f" ; then
 135        if test ! -f "$MERGED" ; then
 136            echo "$MERGED: file not found"
 137        else
 138            echo "$MERGED: file does not need merging"
 139        fi
 140        return 1
 141    fi
 142
 143    ext="$$$(expr "$MERGED" : '.*\(\.[^/]*\)$')"
 144    BACKUP="./$MERGED.BACKUP.$ext"
 145    LOCAL="./$MERGED.LOCAL.$ext"
 146    REMOTE="./$MERGED.REMOTE.$ext"
 147    BASE="./$MERGED.BASE.$ext"
 148
 149    mv -- "$MERGED" "$BACKUP"
 150    cp -- "$BACKUP" "$MERGED"
 151
 152    base_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}'`
 153    local_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}'`
 154    remote_mode=`git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}'`
 155
 156    base_present   && git cat-file blob ":1:$prefix$MERGED" >"$BASE" 2>/dev/null
 157    local_present  && git cat-file blob ":2:$prefix$MERGED" >"$LOCAL" 2>/dev/null
 158    remote_present && git cat-file blob ":3:$prefix$MERGED" >"$REMOTE" 2>/dev/null
 159
 160    if test -z "$local_mode" -o -z "$remote_mode"; then
 161        echo "Deleted merge conflict for '$MERGED':"
 162        describe_file "$local_mode" "local" "$LOCAL"
 163        describe_file "$remote_mode" "remote" "$REMOTE"
 164        resolve_deleted_merge
 165        return
 166    fi
 167
 168    if is_symlink "$local_mode" || is_symlink "$remote_mode"; then
 169        echo "Symbolic link merge conflict for '$MERGED':"
 170        describe_file "$local_mode" "local" "$LOCAL"
 171        describe_file "$remote_mode" "remote" "$REMOTE"
 172        resolve_symlink_merge
 173        return
 174    fi
 175
 176    echo "Normal merge conflict for '$MERGED':"
 177    describe_file "$local_mode" "local" "$LOCAL"
 178    describe_file "$remote_mode" "remote" "$REMOTE"
 179    if "$prompt" = true; then
 180        printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
 181        read ans
 182    fi
 183
 184    case "$merge_tool" in
 185        kdiff3)
 186            if base_present ; then
 187                ("$merge_tool_path" --auto --L1 "$MERGED (Base)" --L2 "$MERGED (Local)" --L3 "$MERGED (Remote)" \
 188                    -o "$MERGED" "$BASE" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 189            else
 190                ("$merge_tool_path" --auto --L1 "$MERGED (Local)" --L2 "$MERGED (Remote)" \
 191                    -o "$MERGED" "$LOCAL" "$REMOTE" > /dev/null 2>&1)
 192            fi
 193            status=$?
 194            ;;
 195        tkdiff)
 196            if base_present ; then
 197                "$merge_tool_path" -a "$BASE" -o "$MERGED" "$LOCAL" "$REMOTE"
 198            else
 199                "$merge_tool_path" -o "$MERGED" "$LOCAL" "$REMOTE"
 200            fi
 201            status=$?
 202            ;;
 203        meld)
 204            touch "$BACKUP"
 205            "$merge_tool_path" "$LOCAL" "$MERGED" "$REMOTE"
 206            check_unchanged
 207            ;;
 208        vimdiff)
 209            touch "$BACKUP"
 210            "$merge_tool_path" -c "wincmd l" "$LOCAL" "$MERGED" "$REMOTE"
 211            check_unchanged
 212            ;;
 213        gvimdiff)
 214            touch "$BACKUP"
 215            "$merge_tool_path" -c "wincmd l" -f "$LOCAL" "$MERGED" "$REMOTE"
 216            check_unchanged
 217            ;;
 218        xxdiff)
 219            touch "$BACKUP"
 220            if base_present ; then
 221                "$merge_tool_path" -X --show-merged-pane \
 222                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 223                    -R 'Accel.Search: "Ctrl+F"' \
 224                    -R 'Accel.SearchForward: "Ctrl-G"' \
 225                    --merged-file "$MERGED" "$LOCAL" "$BASE" "$REMOTE"
 226            else
 227                "$merge_tool_path" -X --show-merged-pane \
 228                    -R 'Accel.SaveAsMerged: "Ctrl-S"' \
 229                    -R 'Accel.Search: "Ctrl+F"' \
 230                    -R 'Accel.SearchForward: "Ctrl-G"' \
 231                    --merged-file "$MERGED" "$LOCAL" "$REMOTE"
 232            fi
 233            check_unchanged
 234            ;;
 235        opendiff)
 236            touch "$BACKUP"
 237            if base_present; then
 238                "$merge_tool_path" "$LOCAL" "$REMOTE" -ancestor "$BASE" -merge "$MERGED" | cat
 239            else
 240                "$merge_tool_path" "$LOCAL" "$REMOTE" -merge "$MERGED" | cat
 241            fi
 242            check_unchanged
 243            ;;
 244        ecmerge)
 245            touch "$BACKUP"
 246            if base_present; then
 247                "$merge_tool_path" "$BASE" "$LOCAL" "$REMOTE" --default --mode=merge3 --to="$MERGED"
 248            else
 249                "$merge_tool_path" "$LOCAL" "$REMOTE" --default --mode=merge2 --to="$MERGED"
 250            fi
 251            check_unchanged
 252            ;;
 253        emerge)
 254            if base_present ; then
 255                "$merge_tool_path" -f emerge-files-with-ancestor-command "$LOCAL" "$REMOTE" "$BASE" "$(basename "$MERGED")"
 256            else
 257                "$merge_tool_path" -f emerge-files-command "$LOCAL" "$REMOTE" "$(basename "$MERGED")"
 258            fi
 259            status=$?
 260            ;;
 261        *)
 262            if test -n "$merge_tool_cmd"; then
 263                if test "$merge_tool_trust_exit_code" = "false"; then
 264                    touch "$BACKUP"
 265                    ( eval $merge_tool_cmd )
 266                    check_unchanged
 267                else
 268                    ( eval $merge_tool_cmd )
 269                    status=$?
 270                fi
 271            fi
 272            ;;
 273    esac
 274    if test "$status" -ne 0; then
 275        echo "merge of $MERGED failed" 1>&2
 276        mv -- "$BACKUP" "$MERGED"
 277
 278        if test "$merge_keep_temporaries" = "false"; then
 279            cleanup_temp_files
 280        fi
 281
 282        return 1
 283    fi
 284
 285    if test "$merge_keep_backup" = "true"; then
 286        mv -- "$BACKUP" "$MERGED.orig"
 287    else
 288        rm -- "$BACKUP"
 289    fi
 290
 291    git add -- "$MERGED"
 292    cleanup_temp_files
 293    return 0
 294}
 295
 296prompt=$(git config --bool mergetool.prompt || echo true)
 297
 298while test $# != 0
 299do
 300    case "$1" in
 301        -t|--tool*)
 302            case "$#,$1" in
 303                *,*=*)
 304                    merge_tool=`expr "z$1" : 'z-[^=]*=\(.*\)'`
 305                    ;;
 306                1,*)
 307                    usage ;;
 308                *)
 309                    merge_tool="$2"
 310                    shift ;;
 311            esac
 312            ;;
 313        -y|--no-prompt)
 314            prompt=false
 315            ;;
 316        --prompt)
 317            prompt=true
 318            ;;
 319        --)
 320            shift
 321            break
 322            ;;
 323        -*)
 324            usage
 325            ;;
 326        *)
 327            break
 328            ;;
 329    esac
 330    shift
 331done
 332
 333valid_custom_tool()
 334{
 335    merge_tool_cmd="$(git config mergetool.$1.cmd)"
 336    test -n "$merge_tool_cmd"
 337}
 338
 339valid_tool() {
 340        case "$1" in
 341                kdiff3 | tkdiff | xxdiff | meld | opendiff | emerge | vimdiff | gvimdiff | ecmerge)
 342                        ;; # happy
 343                *)
 344                        if ! valid_custom_tool "$1"; then
 345                                return 1
 346                        fi
 347                        ;;
 348        esac
 349}
 350
 351init_merge_tool_path() {
 352        merge_tool_path=`git config mergetool.$1.path`
 353        if test -z "$merge_tool_path" ; then
 354                case "$1" in
 355                        emerge)
 356                                merge_tool_path=emacs
 357                                ;;
 358                        *)
 359                                merge_tool_path=$1
 360                                ;;
 361                esac
 362        fi
 363}
 364
 365prompt_after_failed_merge() {
 366    while true; do
 367        printf "Continue merging other unresolved paths (y/n) ? "
 368        read ans
 369        case "$ans" in
 370
 371            [yY]*)
 372                return 0
 373                ;;
 374
 375            [nN]*)
 376                return 1
 377                ;;
 378        esac
 379    done
 380}
 381
 382if test -z "$merge_tool"; then
 383    merge_tool=`git config merge.tool`
 384    if test -n "$merge_tool" && ! valid_tool "$merge_tool"; then
 385            echo >&2 "git config option merge.tool set to unknown tool: $merge_tool"
 386            echo >&2 "Resetting to default..."
 387            unset merge_tool
 388    fi
 389fi
 390
 391if test -z "$merge_tool" ; then
 392    if test -n "$DISPLAY"; then
 393        if test -n "$GNOME_DESKTOP_SESSION_ID" ; then
 394            merge_tool_candidates="meld kdiff3 tkdiff xxdiff gvimdiff"
 395        else
 396            merge_tool_candidates="kdiff3 tkdiff xxdiff meld gvimdiff"
 397        fi
 398    fi
 399    if echo "${VISUAL:-$EDITOR}" | grep 'emacs' > /dev/null 2>&1; then
 400        merge_tool_candidates="$merge_tool_candidates emerge opendiff vimdiff"
 401    elif echo "${VISUAL:-$EDITOR}" | grep 'vim' > /dev/null 2>&1; then
 402        merge_tool_candidates="$merge_tool_candidates vimdiff opendiff emerge"
 403    else
 404        merge_tool_candidates="$merge_tool_candidates opendiff emerge vimdiff"
 405    fi
 406    echo "merge tool candidates: $merge_tool_candidates"
 407    for i in $merge_tool_candidates; do
 408        init_merge_tool_path $i
 409        if type "$merge_tool_path" > /dev/null 2>&1; then
 410            merge_tool=$i
 411            break
 412        fi
 413    done
 414    if test -z "$merge_tool" ; then
 415        echo "No known merge resolution program available."
 416        exit 1
 417    fi
 418else
 419    if ! valid_tool "$merge_tool"; then
 420        echo >&2 "Unknown merge_tool $merge_tool"
 421        exit 1
 422    fi
 423
 424    init_merge_tool_path "$merge_tool"
 425
 426    merge_keep_backup="$(git config --bool merge.keepBackup || echo true)"
 427    merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 428
 429    if test -z "$merge_tool_cmd" && ! type "$merge_tool_path" > /dev/null 2>&1; then
 430        echo "The merge tool $merge_tool is not available as '$merge_tool_path'"
 431        exit 1
 432    fi
 433
 434    if ! test -z "$merge_tool_cmd"; then
 435        merge_tool_trust_exit_code="$(git config --bool mergetool.$merge_tool.trustExitCode || echo false)"
 436    fi
 437fi
 438
 439last_status=0
 440rollup_status=0
 441
 442if test $# -eq 0 ; then
 443    files=`git ls-files -u | sed -e 's/^[^      ]*      //' | sort -u`
 444    if test -z "$files" ; then
 445        echo "No files need merging"
 446        exit 0
 447    fi
 448    echo Merging the files: "$files"
 449    git ls-files -u |
 450    sed -e 's/^[^       ]*      //' |
 451    sort -u |
 452    while IFS= read i
 453    do
 454        if test $last_status -ne 0; then
 455            prompt_after_failed_merge < /dev/tty || exit 1
 456        fi
 457        printf "\n"
 458        merge_file "$i" < /dev/tty > /dev/tty
 459        last_status=$?
 460        if test $last_status -ne 0; then
 461            rollup_status=1
 462        fi
 463    done
 464else
 465    while test $# -gt 0; do
 466        if test $last_status -ne 0; then
 467            prompt_after_failed_merge || exit 1
 468        fi
 469        printf "\n"
 470        merge_file "$1"
 471        last_status=$?
 472        if test $last_status -ne 0; then
 473            rollup_status=1
 474        fi
 475        shift
 476    done
 477fi
 478
 479exit $rollup_status