git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 . git-sh-setup
   6 . git-parse-remote
   7 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
   8 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
   9
  10 LF='
  11 '
  12 IFS="$LF"
  13
  14 no_tags=
  15 tags=
  16 append=
  17 force=
  18 verbose=
  19 update_head_ok=
  20 exec=
  21 upload_pack=
  22 while case "$#" in 0) break ;; esac
  23 do
  24         case "$1" in
  25         -a|--a|--ap|--app|--appe|--appen|--append)
  26                 append=t
  27                 ;;
  28         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  29         --upload-pa|--upload-pac|--upload-pack)
  30                 shift
  31                 exec="--exec=$1"
  32                 upload_pack="-u $1"
  33                 ;;
  34         -f|--f|--fo|--for|--forc|--force)
  35                 force=t
  36                 ;;
  37         -t|--t|--ta|--tag|--tags)
  38                 tags=t
  39                 ;;
  40         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  41                 no_tags=t
  42                 ;;
  43         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  44         --update-he|--update-hea|--update-head|--update-head-|\
  45         --update-head-o|--update-head-ok)
  46                 update_head_ok=t
  47                 ;;
  48         -v|--verbose)
  49                 verbose=Yes
  50                 ;;
  51         -k|--k|--ke|--kee|--keep)
  52                 keep=--keep
  53                 ;;
  54         -*)
  55                 usage
  56                 ;;
  57         *)
  58                 break
  59                 ;;
  60         esac
  61         shift
  62 done
  63
  64 case "$#" in
  65 0)
  66         test -f "$GIT_DIR/branches/origin" ||
  67                 test -f "$GIT_DIR/remotes/origin" ||
  68                         die "Where do you want to fetch from today?"
  69         set origin ;;
  70 esac
  71
  72 remote_nick="$1"
  73 remote=$(get_remote_url "$@")
  74 refs=
  75 rref=
  76 rsync_slurped_objects=
  77
  78 if test "" = "$append"
  79 then
  80         : >"$GIT_DIR/FETCH_HEAD"
  81 fi
  82
  83 append_fetch_head () {
  84     head_="$1"
  85     remote_="$2"
  86     remote_name_="$3"
  87     remote_nick_="$4"
  88     local_name_="$5"
  89     case "$6" in
  90     t) not_for_merge_='not-for-merge' ;;
  91     '') not_for_merge_= ;;
  92     esac
  93
  94     # remote-nick is the URL given on the command line (or a shorthand)
  95     # remote-name is the $GIT_DIR relative refs/ path we computed
  96     # for this refspec.
  97
  98     # the $note_ variable will be fed to git-fmt-merge-msg for further
  99     # processing.
 100     case "$remote_name_" in
 101     HEAD)
 102         note_= ;;
 103     refs/heads/*)
 104         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 105         note_="branch '$note_' of " ;;
 106     refs/tags/*)
 107         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 108         note_="tag '$note_' of " ;;
 109     refs/remotes/*)
 110         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 111         note_="remote branch '$note_' of " ;;
 112     *)
 113         note_="$remote_name of " ;;
 114     esac
 115     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
 116         remote_="$remote_1_"
 117     note_="$note_$remote_"
 118
 119     # 2.6.11-tree tag would not be happy to be fed to resolve.
 120     if git-cat-file commit "$head_" >/dev/null 2>&1
 121     then
 122         headc_=$(git-rev-parse --verify "$head_^0") || exit
 123         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 124         [ "$verbose" ] && echo >&2 "* committish: $head_"
 125         [ "$verbose" ] && echo >&2 "  $note_"
 126     else
 127         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 128         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 129         [ "$verbose" ] && echo >&2 "  $note_"
 130     fi
 131     if test "$local_name_" != ""
 132     then
 133         # We are storing the head locally.  Make sure that it is
 134         # a fast forward (aka "reverse push").
 135         fast_forward_local "$local_name_" "$head_" "$note_"
 136     fi
 137 }
 138
 139 fast_forward_local () {
 140     mkdir -p "$(dirname "$GIT_DIR/$1")"
 141     case "$1" in
 142     refs/tags/*)
 143         # Tags need not be pointing at commits so there
 144         # is no way to guarantee "fast-forward" anyway.
 145         if test -f "$GIT_DIR/$1"
 146         then
 147                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 148                 then
 149                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 150                 else
 151                         echo >&2 "* $1: updating with $3"
 152                 fi
 153         else
 154                 echo >&2 "* $1: storing $3"
 155         fi
 156         git-update-ref "$1" "$2"
 157         ;;
 158
 159     refs/heads/* | refs/remotes/*)
 160         # $1 is the ref being updated.
 161         # $2 is the new value for the ref.
 162         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 163         if test "$local"
 164         then
 165             # Require fast-forward.
 166             mb=$(git-merge-base "$local" "$2") &&
 167             case "$2,$mb" in
 168             $local,*)
 169                 echo >&2 "* $1: same as $3"
 170                 ;;
 171             *,$local)
 172                 echo >&2 "* $1: fast forward to $3"
 173                 echo >&2 "  from $local to $2"
 174                 git-update-ref "$1" "$2" "$local"
 175                 ;;
 176             *)
 177                 false
 178                 ;;
 179             esac || {
 180                 echo >&2 "* $1: does not fast forward to $3;"
 181                 case ",$force,$single_force," in
 182                 *,t,*)
 183                         echo >&2 "  forcing update."
 184                         git-update-ref "$1" "$2" "$local"
 185                         ;;
 186                 *)
 187                         echo >&2 "  not updating."
 188                         ;;
 189                 esac
 190             }
 191         else
 192             echo >&2 "* $1: storing $3"
 193             git-update-ref "$1" "$2"
 194         fi
 195         ;;
 196     esac
 197 }
 198
 199 case "$update_head_ok" in
 200 '')
 201         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 202         ;;
 203 esac
 204
 205 # If --tags (and later --heads or --all) is specified, then we are
 206 # not talking about defaults stored in Pull: line of remotes or
 207 # branches file, and just fetch those and refspecs explicitly given.
 208 # Otherwise we do what we always did.
 209
 210 reflist=$(get_remote_refs_for_fetch "$@")
 211 if test "$tags"
 212 then
 213         taglist=$(IFS=" " &&
 214                   git-ls-remote $upload_pack --tags "$remote" |
 215                   while read sha1 name
 216                   do
 217                         case "$name" in
 218                         (*^*) continue ;;
 219                         esac
 220                         if git-check-ref-format "$name"
 221                         then
 222                             echo ".${name}:${name}"
 223                         else
 224                             echo >&2 "warning: tag ${name} ignored"
 225                         fi
 226                   done)
 227         if test "$#" -gt 1
 228         then
 229                 # remote URL plus explicit refspecs; we need to merge them.
 230                 reflist="$reflist$LF$taglist"
 231         else
 232                 # No explicit refspecs; fetch tags only.
 233                 reflist=$taglist
 234         fi
 235 fi
 236
 237 fetch_main () {
 238   reflist="$1"
 239   refs=
 240
 241   for ref in $reflist
 242   do
 243       refs="$refs$LF$ref"
 244
 245       # These are relative path from $GIT_DIR, typically starting at refs/
 246       # but may be HEAD
 247       if expr "$ref" : '\.' >/dev/null
 248       then
 249           not_for_merge=t
 250           ref=$(expr "$ref" : '\.\(.*\)')
 251       else
 252           not_for_merge=
 253       fi
 254       if expr "$ref" : '\+' >/dev/null
 255       then
 256           single_force=t
 257           ref=$(expr "$ref" : '\+\(.*\)')
 258       else
 259           single_force=
 260       fi
 261       remote_name=$(expr "$ref" : '\([^:]*\):')
 262       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 263
 264       rref="$rref$LF$remote_name"
 265
 266       # There are transports that can fetch only one head at a time...
 267       case "$remote" in
 268       http://* | https://*)
 269           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 270               curl_extra_args="-k"
 271           fi
 272           remote_name_quoted=$(perl -e '
 273               my $u = $ARGV[0];
 274               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 275               print "$u";
 276           ' "$remote_name")
 277           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 278           expr "$head" : "$_x40\$" >/dev/null ||
 279                   die "Failed to fetch $remote_name from $remote"
 280           echo >&2 Fetching "$remote_name from $remote" using http
 281           git-http-fetch -v -a "$head" "$remote/" || exit
 282           ;;
 283       rsync://*)
 284           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 285           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 286           head=$(git-rev-parse --verify TMP_HEAD)
 287           rm -f "$TMP_HEAD"
 288           test "$rsync_slurped_objects" || {
 289               rsync -av --ignore-existing --exclude info \
 290                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 291
 292               # Look at objects/info/alternates for rsync -- http will
 293               # support it natively and git native ones will do it on
 294               # the remote end.  Not having that file is not a crime.
 295               rsync -q "$remote/objects/info/alternates" \
 296                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 297                   rm -f "$GIT_DIR/TMP_ALT"
 298               if test -f "$GIT_DIR/TMP_ALT"
 299               then
 300                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 301                   while read alt
 302                   do
 303                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 304                       echo >&2 "Getting alternate: $alt"
 305                       rsync -av --ignore-existing --exclude info \
 306                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 307                   done
 308                   rm -f "$GIT_DIR/TMP_ALT"
 309               fi
 310               rsync_slurped_objects=t
 311           }
 312           ;;
 313       *)
 314           # We will do git native transport with just one call later.
 315           continue ;;
 316       esac
 317
 318       append_fetch_head "$head" "$remote" \
 319           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 320
 321   done
 322
 323   case "$remote" in
 324   http://* | https://* | rsync://* )
 325       ;; # we are already done.
 326   *)
 327     ( : subshell because we muck with IFS
 328       IFS="     $LF"
 329       (
 330           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
 331       ) |
 332       while read sha1 remote_name
 333       do
 334           case "$sha1" in
 335           failed)
 336                   echo >&2 "Fetch failure: $remote"
 337                   exit 1 ;;
 338           esac
 339           found=
 340           single_force=
 341           for ref in $refs
 342           do
 343               case "$ref" in
 344               +$remote_name:*)
 345                   single_force=t
 346                   not_for_merge=
 347                   found="$ref"
 348                   break ;;
 349               .+$remote_name:*)
 350                   single_force=t
 351                   not_for_merge=t
 352                   found="$ref"
 353                   break ;;
 354               .$remote_name:*)
 355                   not_for_merge=t
 356                   found="$ref"
 357                   break ;;
 358               $remote_name:*)
 359                   not_for_merge=
 360                   found="$ref"
 361                   break ;;
 362               esac
 363           done
 364           local_name=$(expr "$found" : '[^:]*:\(.*\)')
 365           append_fetch_head "$sha1" "$remote" \
 366                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 367       done
 368     ) || exit ;;
 369   esac
 370
 371 }
 372
 373 fetch_main "$reflist"
 374
 375 # automated tag following
 376 case "$no_tags$tags" in
 377 '')
 378         case "$reflist" in
 379         *:refs/*)
 380                 # effective only when we are following remote branch
 381                 # using local tracking branch.
 382                 taglist=$(IFS=" " &&
 383                 git-ls-remote $upload_pack --tags "$remote" |
 384                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 385                 while read sha1 name
 386                 do
 387                         test -f "$GIT_DIR/$name" && continue
 388                         git-check-ref-format "$name" || {
 389                                 echo >&2 "warning: tag ${name} ignored"
 390                                 continue
 391                         }
 392                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 393                         echo >&2 "Auto-following $name"
 394                         echo ".${name}:${name}"
 395                 done)
 396         esac
 397         case "$taglist" in
 398         '') ;;
 399         ?*)
 400                 fetch_main "$taglist" ;;
 401         esac
 402 esac
 403
 404 # If the original head was empty (i.e. no "master" yet), or
 405 # if we were told not to worry, we do not have to check.
 406 case ",$update_head_ok,$orig_head," in
 407 *,, | t,* )
 408         ;;
 409 *)
 410         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 411         if test "$curr_head" != "$orig_head"
 412         then
 413                 git-update-ref HEAD "$orig_head"
 414                 die "Cannot fetch into the current branch."
 415         fi
 416         ;;
 417 esac