git-mergetool.sh

   1 #!/bin/sh
   2 #
   3 # This program resolves merge conflicts in git
   4 #
   5 # Copyright (c) 2006 Theodore Y. Ts'o
   6 # Copyright (c) 2009-2016 David Aguilar
   7 #
   8 # This file is licensed under the GPL v2, or a later version
   9 # at the discretion of Junio C Hamano.
  10 #
  11
  12 USAGE='[--tool=tool] [--tool-help] [-y|--no-prompt|--prompt] [-g|--gui|--no-gui] [-O<orderfile>] [file to merge] ...'
  13 SUBDIRECTORY_OK=Yes
  14 NONGIT_OK=Yes
  15 OPTIONS_SPEC=
  16 TOOL_MODE=merge
  17 . git-sh-setup
  18 . git-mergetool--lib
  19
  20 # Returns true if the mode reflects a symlink
  21 is_symlink () {
  22         test "$1" = 120000
  23 }
  24
  25 is_submodule () {
  26         test "$1" = 160000
  27 }
  28
  29 local_present () {
  30         test -n "$local_mode"
  31 }
  32
  33 remote_present () {
  34         test -n "$remote_mode"
  35 }
  36
  37 base_present () {
  38         test -n "$base_mode"
  39 }
  40
  41 mergetool_tmpdir_init () {
  42         if test "$(git config --bool mergetool.writeToTemp)" != true
  43         then
  44                 MERGETOOL_TMPDIR=.
  45                 return 0
  46         fi
  47         if MERGETOOL_TMPDIR=$(mktemp -d -t "git-mergetool-XXXXXX" 2>/dev/null)
  48         then
  49                 return 0
  50         fi
  51         die "error: mktemp is needed when 'mergetool.writeToTemp' is true"
  52 }
  53
  54 cleanup_temp_files () {
  55         if test "$1" = --save-backup
  56         then
  57                 rm -rf -- "$MERGED.orig"
  58                 test -e "$BACKUP" && mv -- "$BACKUP" "$MERGED.orig"
  59                 rm -f -- "$LOCAL" "$REMOTE" "$BASE"
  60         else
  61                 rm -f -- "$LOCAL" "$REMOTE" "$BASE" "$BACKUP"
  62         fi
  63         if test "$MERGETOOL_TMPDIR" != "."
  64         then
  65                 rmdir "$MERGETOOL_TMPDIR"
  66         fi
  67 }
  68
  69 describe_file () {
  70         mode="$1"
  71         branch="$2"
  72         file="$3"
  73
  74         printf "  {%s}: " "$branch"
  75         if test -z "$mode"
  76         then
  77                 echo "deleted"
  78         elif is_symlink "$mode"
  79         then
  80                 echo "a symbolic link -> '$(cat "$file")'"
  81         elif is_submodule "$mode"
  82         then
  83                 echo "submodule commit $file"
  84         elif base_present
  85         then
  86                 echo "modified file"
  87         else
  88                 echo "created file"
  89         fi
  90 }
  91
  92 resolve_symlink_merge () {
  93         while true
  94         do
  95                 printf "Use (l)ocal or (r)emote, or (a)bort? "
  96                 read ans || return 1
  97                 case "$ans" in
  98                 [lL]*)
  99                         git checkout-index -f --stage=2 -- "$MERGED"
 100                         git add -- "$MERGED"
 101                         cleanup_temp_files --save-backup
 102                         return 0
 103                         ;;
 104                 [rR]*)
 105                         git checkout-index -f --stage=3 -- "$MERGED"
 106                         git add -- "$MERGED"
 107                         cleanup_temp_files --save-backup
 108                         return 0
 109                         ;;
 110                 [aA]*)
 111                         return 1
 112                         ;;
 113                 esac
 114         done
 115 }
 116
 117 resolve_deleted_merge () {
 118         while true
 119         do
 120                 if base_present
 121                 then
 122                         printf "Use (m)odified or (d)eleted file, or (a)bort? "
 123                 else
 124                         printf "Use (c)reated or (d)eleted file, or (a)bort? "
 125                 fi
 126                 read ans || return 1
 127                 case "$ans" in
 128                 [mMcC]*)
 129                         git add -- "$MERGED"
 130                         if test "$merge_keep_backup" = "true"
 131                         then
 132                                 cleanup_temp_files --save-backup
 133                         else
 134                                 cleanup_temp_files
 135                         fi
 136                         return 0
 137                         ;;
 138                 [dD]*)
 139                         git rm -- "$MERGED" > /dev/null
 140                         cleanup_temp_files
 141                         return 0
 142                         ;;
 143                 [aA]*)
 144                         if test "$merge_keep_temporaries" = "false"
 145                         then
 146                                 cleanup_temp_files
 147                         fi
 148                         return 1
 149                         ;;
 150                 esac
 151         done
 152 }
 153
 154 resolve_submodule_merge () {
 155         while true
 156         do
 157                 printf "Use (l)ocal or (r)emote, or (a)bort? "
 158                 read ans || return 1
 159                 case "$ans" in
 160                 [lL]*)
 161                         if ! local_present
 162                         then
 163                                 if test -n "$(git ls-tree HEAD -- "$MERGED")"
 164                                 then
 165                                         # Local isn't present, but it's a subdirectory
 166                                         git ls-tree --full-name -r HEAD -- "$MERGED" |
 167                                         git update-index --index-info || exit $?
 168                                 else
 169                                         test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
 170                                         git update-index --force-remove "$MERGED"
 171                                         cleanup_temp_files --save-backup
 172                                 fi
 173                         elif is_submodule "$local_mode"
 174                         then
 175                                 stage_submodule "$MERGED" "$local_sha1"
 176                         else
 177                                 git checkout-index -f --stage=2 -- "$MERGED"
 178                                 git add -- "$MERGED"
 179                         fi
 180                         return 0
 181                         ;;
 182                 [rR]*)
 183                         if ! remote_present
 184                         then
 185                                 if test -n "$(git ls-tree MERGE_HEAD -- "$MERGED")"
 186                                 then
 187                                         # Remote isn't present, but it's a subdirectory
 188                                         git ls-tree --full-name -r MERGE_HEAD -- "$MERGED" |
 189                                         git update-index --index-info || exit $?
 190                                 else
 191                                         test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
 192                                         git update-index --force-remove "$MERGED"
 193                                 fi
 194                         elif is_submodule "$remote_mode"
 195                         then
 196                                 ! is_submodule "$local_mode" &&
 197                                 test -e "$MERGED" &&
 198                                 mv -- "$MERGED" "$BACKUP"
 199                                 stage_submodule "$MERGED" "$remote_sha1"
 200                         else
 201                                 test -e "$MERGED" && mv -- "$MERGED" "$BACKUP"
 202                                 git checkout-index -f --stage=3 -- "$MERGED"
 203                                 git add -- "$MERGED"
 204                         fi
 205                         cleanup_temp_files --save-backup
 206                         return 0
 207                         ;;
 208                 [aA]*)
 209                         return 1
 210                         ;;
 211                 esac
 212         done
 213 }
 214
 215 stage_submodule () {
 216         path="$1"
 217         submodule_sha1="$2"
 218         mkdir -p "$path" ||
 219         die "fatal: unable to create directory for module at $path"
 220         # Find $path relative to work tree
 221         work_tree_root=$(cd_to_toplevel && pwd)
 222         work_rel_path=$(cd "$path" &&
 223                 GIT_WORK_TREE="${work_tree_root}" git rev-parse --show-prefix
 224         )
 225         test -n "$work_rel_path" ||
 226         die "fatal: unable to get path of module $path relative to work tree"
 227         git update-index --add --replace --cacheinfo 160000 "$submodule_sha1" "${work_rel_path%/}" || die
 228 }
 229
 230 checkout_staged_file () {
 231         tmpfile="$(git checkout-index --temp --stage="$1" "$2" 2>/dev/null)" &&
 232         tmpfile=${tmpfile%%'    '*}
 233
 234         if test $? -eq 0 && test -n "$tmpfile"
 235         then
 236                 mv -- "$(git rev-parse --show-cdup)$tmpfile" "$3"
 237         else
 238                 >"$3"
 239         fi
 240 }
 241
 242 merge_file () {
 243         MERGED="$1"
 244
 245         f=$(git ls-files -u -- "$MERGED")
 246         if test -z "$f"
 247         then
 248                 if test ! -f "$MERGED"
 249                 then
 250                         echo "$MERGED: file not found"
 251                 else
 252                         echo "$MERGED: file does not need merging"
 253                 fi
 254                 return 1
 255         fi
 256
 257         # extract file extension from the last path component
 258         case "${MERGED##*/}" in
 259         *.*)
 260                 ext=.${MERGED##*.}
 261                 BASE=${MERGED%"$ext"}
 262                 ;;
 263         *)
 264                 BASE=$MERGED
 265                 ext=
 266         esac
 267
 268         mergetool_tmpdir_init
 269
 270         if test "$MERGETOOL_TMPDIR" != "."
 271         then
 272                 # If we're using a temporary directory then write to the
 273                 # top-level of that directory.
 274                 BASE=${BASE##*/}
 275         fi
 276
 277         BACKUP="$MERGETOOL_TMPDIR/${BASE}_BACKUP_$$$ext"
 278         LOCAL="$MERGETOOL_TMPDIR/${BASE}_LOCAL_$$$ext"
 279         REMOTE="$MERGETOOL_TMPDIR/${BASE}_REMOTE_$$$ext"
 280         BASE="$MERGETOOL_TMPDIR/${BASE}_BASE_$$$ext"
 281
 282         base_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==1) print $1;}')
 283         local_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $1;}')
 284         remote_mode=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $1;}')
 285
 286         if is_submodule "$local_mode" || is_submodule "$remote_mode"
 287         then
 288                 echo "Submodule merge conflict for '$MERGED':"
 289                 local_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==2) print $2;}')
 290                 remote_sha1=$(git ls-files -u -- "$MERGED" | awk '{if ($3==3) print $2;}')
 291                 describe_file "$local_mode" "local" "$local_sha1"
 292                 describe_file "$remote_mode" "remote" "$remote_sha1"
 293                 resolve_submodule_merge
 294                 return
 295         fi
 296
 297         if test -f "$MERGED"
 298         then
 299                 mv -- "$MERGED" "$BACKUP"
 300                 cp -- "$BACKUP" "$MERGED"
 301         fi
 302         # Create a parent directory to handle delete/delete conflicts
 303         # where the base's directory no longer exists.
 304         mkdir -p "$(dirname "$MERGED")"
 305
 306         checkout_staged_file 1 "$MERGED" "$BASE"
 307         checkout_staged_file 2 "$MERGED" "$LOCAL"
 308         checkout_staged_file 3 "$MERGED" "$REMOTE"
 309
 310         if test -z "$local_mode" || test -z "$remote_mode"
 311         then
 312                 echo "Deleted merge conflict for '$MERGED':"
 313                 describe_file "$local_mode" "local" "$LOCAL"
 314                 describe_file "$remote_mode" "remote" "$REMOTE"
 315                 resolve_deleted_merge
 316                 status=$?
 317                 rmdir -p "$(dirname "$MERGED")" 2>/dev/null
 318                 return $status
 319         fi
 320
 321         if is_symlink "$local_mode" || is_symlink "$remote_mode"
 322         then
 323                 echo "Symbolic link merge conflict for '$MERGED':"
 324                 describe_file "$local_mode" "local" "$LOCAL"
 325                 describe_file "$remote_mode" "remote" "$REMOTE"
 326                 resolve_symlink_merge
 327                 return
 328         fi
 329
 330         echo "Normal merge conflict for '$MERGED':"
 331         describe_file "$local_mode" "local" "$LOCAL"
 332         describe_file "$remote_mode" "remote" "$REMOTE"
 333         if test "$guessed_merge_tool" = true || test "$prompt" = true
 334         then
 335                 printf "Hit return to start merge resolution tool (%s): " "$merge_tool"
 336                 read ans || return 1
 337         fi
 338
 339         if base_present
 340         then
 341                 present=true
 342         else
 343                 present=false
 344         fi
 345
 346         if ! run_merge_tool "$merge_tool" "$present"
 347         then
 348                 echo "merge of $MERGED failed" 1>&2
 349                 mv -- "$BACKUP" "$MERGED"
 350
 351                 if test "$merge_keep_temporaries" = "false"
 352                 then
 353                         cleanup_temp_files
 354                 fi
 355
 356                 return 1
 357         fi
 358
 359         if test "$merge_keep_backup" = "true"
 360         then
 361                 mv -- "$BACKUP" "$MERGED.orig"
 362         else
 363                 rm -- "$BACKUP"
 364         fi
 365
 366         git add -- "$MERGED"
 367         cleanup_temp_files
 368         return 0
 369 }
 370
 371 prompt_after_failed_merge () {
 372         while true
 373         do
 374                 printf "Continue merging other unresolved paths [y/n]? "
 375                 read ans || return 1
 376                 case "$ans" in
 377                 [yY]*)
 378                         return 0
 379                         ;;
 380                 [nN]*)
 381                         return 1
 382                         ;;
 383                 esac
 384         done
 385 }
 386
 387 print_noop_and_exit () {
 388         echo "No files need merging"
 389         exit 0
 390 }
 391
 392 main () {
 393         prompt=$(git config --bool mergetool.prompt)
 394         GIT_MERGETOOL_GUI=false
 395         guessed_merge_tool=false
 396         orderfile=
 397
 398         while test $# != 0
 399         do
 400                 case "$1" in
 401                 --tool-help=*)
 402                         TOOL_MODE=${1#--tool-help=}
 403                         show_tool_help
 404                         ;;
 405                 --tool-help)
 406                         show_tool_help
 407                         ;;
 408                 -t|--tool*)
 409                         case "$#,$1" in
 410                         *,*=*)
 411                                 merge_tool=${1#*=}
 412                                 ;;
 413                         1,*)
 414                                 usage ;;
 415                         *)
 416                                 merge_tool="$2"
 417                                 shift ;;
 418                         esac
 419                         ;;
 420                 --no-gui)
 421                         GIT_MERGETOOL_GUI=false
 422                         ;;
 423                 -g|--gui)
 424                         GIT_MERGETOOL_GUI=true
 425                         ;;
 426                 -y|--no-prompt)
 427                         prompt=false
 428                         ;;
 429                 --prompt)
 430                         prompt=true
 431                         ;;
 432                 -O*)
 433                         orderfile="${1#-O}"
 434                         ;;
 435                 --)
 436                         shift
 437                         break
 438                         ;;
 439                 -*)
 440                         usage
 441                         ;;
 442                 *)
 443                         break
 444                         ;;
 445                 esac
 446                 shift
 447         done
 448
 449         git_dir_init
 450         require_work_tree
 451
 452         if test -z "$merge_tool"
 453         then
 454                 if ! merge_tool=$(get_merge_tool)
 455                 then
 456                         guessed_merge_tool=true
 457                 fi
 458         fi
 459         merge_keep_backup="$(git config --bool mergetool.keepBackup || echo true)"
 460         merge_keep_temporaries="$(git config --bool mergetool.keepTemporaries || echo false)"
 461
 462         prefix=$(git rev-parse --show-prefix) || exit 1
 463         cd_to_toplevel
 464
 465         if test -n "$orderfile"
 466         then
 467                 orderfile=$(
 468                         git rev-parse --prefix "$prefix" -- "$orderfile" |
 469                         sed -e 1d
 470                 )
 471         fi
 472
 473         if test $# -eq 0 && test -e "$GIT_DIR/MERGE_RR"
 474         then
 475                 set -- $(git rerere remaining)
 476                 if test $# -eq 0
 477                 then
 478                         print_noop_and_exit
 479                 fi
 480         elif test $# -ge 0
 481         then
 482                 # rev-parse provides the -- needed for 'set'
 483                 eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
 484         fi
 485
 486         files=$(git -c core.quotePath=false \
 487                 diff --name-only --diff-filter=U \
 488                 ${orderfile:+"-O$orderfile"} -- "$@")
 489
 490         if test -z "$files"
 491         then
 492                 print_noop_and_exit
 493         fi
 494
 495         printf "Merging:\n"
 496         printf "%s\n" "$files"
 497
 498         rc=0
 499         set -- $files
 500         while test $# -ne 0
 501         do
 502                 printf "\n"
 503                 if ! merge_file "$1"
 504                 then
 505                         rc=1
 506                         test $# -ne 1 && prompt_after_failed_merge || exit 1
 507                 fi
 508                 shift
 509         done
 510
 511         exit $rc
 512 }
 513
 514 main "$@"