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