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                         ;;
 183                 esac
 184             }
 185         else
 186             echo >&2 "* $1: storing $3"
 187             git-update-ref "$1" "$2"
 188         fi
 189         ;;
 190     esac
 191 }
 192
 193 case "$update_head_ok" in
 194 '')
 195         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 196         ;;
 197 esac
 198
 199 # If --tags (and later --heads or --all) is specified, then we are
 200 # not talking about defaults stored in Pull: line of remotes or
 201 # branches file, and just fetch those and refspecs explicitly given.
 202 # Otherwise we do what we always did.
 203
 204 reflist=$(get_remote_refs_for_fetch "$@")
 205 if test "$tags"
 206 then
 207         taglist=$(IFS=" " &&
 208                   git-ls-remote $upload_pack --tags "$remote" |
 209                   while read sha1 name
 210                   do
 211                         case "$name" in
 212                         (*^*) continue ;;
 213                         esac
 214                         if git-check-ref-format "$name"
 215                         then
 216                             echo ".${name}:${name}"
 217                         else
 218                             echo >&2 "warning: tag ${name} ignored"
 219                         fi
 220                   done)
 221         if test "$#" -gt 1
 222         then
 223                 # remote URL plus explicit refspecs; we need to merge them.
 224                 reflist="$reflist$LF$taglist"
 225         else
 226                 # No explicit refspecs; fetch tags only.
 227                 reflist=$taglist
 228         fi
 229 fi
 230
 231 fetch_main () {
 232   reflist="$1"
 233   refs=
 234
 235   for ref in $reflist
 236   do
 237       refs="$refs$LF$ref"
 238
 239       # These are relative path from $GIT_DIR, typically starting at refs/
 240       # but may be HEAD
 241       if expr "$ref" : '\.' >/dev/null
 242       then
 243           not_for_merge=t
 244           ref=$(expr "$ref" : '\.\(.*\)')
 245       else
 246           not_for_merge=
 247       fi
 248       if expr "$ref" : '\+' >/dev/null
 249       then
 250           single_force=t
 251           ref=$(expr "$ref" : '\+\(.*\)')
 252       else
 253           single_force=
 254       fi
 255       remote_name=$(expr "$ref" : '\([^:]*\):')
 256       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 257
 258       rref="$rref$LF$remote_name"
 259
 260       # There are transports that can fetch only one head at a time...
 261       case "$remote" in
 262       http://* | https://*)
 263           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 264               curl_extra_args="-k"
 265           fi
 266           remote_name_quoted=$(perl -e '
 267               my $u = $ARGV[0];
 268               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 269               print "$u";
 270           ' "$remote_name")
 271           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 272           expr "$head" : "$_x40\$" >/dev/null ||
 273                   die "Failed to fetch $remote_name from $remote"
 274           echo >&2 Fetching "$remote_name from $remote" using http
 275           git-http-fetch -v -a "$head" "$remote/" || exit
 276           ;;
 277       rsync://*)
 278           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 279           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 280           head=$(git-rev-parse --verify TMP_HEAD)
 281           rm -f "$TMP_HEAD"
 282           test "$rsync_slurped_objects" || {
 283               rsync -av --ignore-existing --exclude info \
 284                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 285
 286               # Look at objects/info/alternates for rsync -- http will
 287               # support it natively and git native ones will do it on
 288               # the remote end.  Not having that file is not a crime.
 289               rsync -q "$remote/objects/info/alternates" \
 290                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 291                   rm -f "$GIT_DIR/TMP_ALT"
 292               if test -f "$GIT_DIR/TMP_ALT"
 293               then
 294                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 295                   while read alt
 296                   do
 297                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 298                       echo >&2 "Getting alternate: $alt"
 299                       rsync -av --ignore-existing --exclude info \
 300                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 301                   done
 302                   rm -f "$GIT_DIR/TMP_ALT"
 303               fi
 304               rsync_slurped_objects=t
 305           }
 306           ;;
 307       *)
 308           # We will do git native transport with just one call later.
 309           continue ;;
 310       esac
 311
 312       append_fetch_head "$head" "$remote" \
 313           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 314
 315   done
 316
 317   case "$remote" in
 318   http://* | https://* | rsync://* )
 319       ;; # we are already done.
 320   *)
 321     ( : subshell because we muck with IFS
 322       IFS="     $LF"
 323       (
 324           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
 325       ) |
 326       while read sha1 remote_name
 327       do
 328           case "$sha1" in
 329           failed)
 330                   echo >&2 "Fetch failure: $remote"
 331                   exit 1 ;;
 332           esac
 333           found=
 334           single_force=
 335           for ref in $refs
 336           do
 337               case "$ref" in
 338               +$remote_name:*)
 339                   single_force=t
 340                   not_for_merge=
 341                   found="$ref"
 342                   break ;;
 343               .+$remote_name:*)
 344                   single_force=t
 345                   not_for_merge=t
 346                   found="$ref"
 347                   break ;;
 348               .$remote_name:*)
 349                   not_for_merge=t
 350                   found="$ref"
 351                   break ;;
 352               $remote_name:*)
 353                   not_for_merge=
 354                   found="$ref"
 355                   break ;;
 356               esac
 357           done
 358           local_name=$(expr "$found" : '[^:]*:\(.*\)')
 359           append_fetch_head "$sha1" "$remote" \
 360                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 361       done
 362     ) || exit ;;
 363   esac
 364
 365 }
 366
 367 fetch_main "$reflist"
 368
 369 # automated tag following
 370 case "$no_tags$tags" in
 371 '')
 372         case "$reflist" in
 373         *:refs/*)
 374                 # effective only when we are following remote branch
 375                 # using local tracking branch.
 376                 taglist=$(IFS=" " &&
 377                 git-ls-remote $upload_pack --tags "$remote" |
 378                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 379                 while read sha1 name
 380                 do
 381                         test -f "$GIT_DIR/$name" && continue
 382                         git-check-ref-format "$name" || {
 383                                 echo >&2 "warning: tag ${name} ignored"
 384                                 continue
 385                         }
 386                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 387                         echo >&2 "Auto-following $name"
 388                         echo ".${name}:${name}"
 389                 done)
 390         esac
 391         case "$taglist" in
 392         '') ;;
 393         ?*)
 394                 fetch_main "$taglist" ;;
 395         esac
 396 esac
 397
 398 # If the original head was empty (i.e. no "master" yet), or
 399 # if we were told not to worry, we do not have to check.
 400 case ",$update_head_ok,$orig_head," in
 401 *,, | t,* )
 402         ;;
 403 *)
 404         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 405         if test "$curr_head" != "$orig_head"
 406         then
 407                 git-update-ref HEAD "$orig_head"
 408                 die "Cannot fetch into the current branch."
 409         fi
 410         ;;
 411 esac