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_=$(expr "z$remote_" : 'z\(.*\)\.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                         exit 1
 189                         ;;
 190                 esac
 191             }
 192         else
 193             echo >&2 "* $1: storing $3"
 194             git-update-ref "$1" "$2"
 195         fi
 196         ;;
 197     esac
 198 }
 199
 200 case "$update_head_ok" in
 201 '')
 202         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 203         ;;
 204 esac
 205
 206 # If --tags (and later --heads or --all) is specified, then we are
 207 # not talking about defaults stored in Pull: line of remotes or
 208 # branches file, and just fetch those and refspecs explicitly given.
 209 # Otherwise we do what we always did.
 210
 211 reflist=$(get_remote_refs_for_fetch "$@")
 212 if test "$tags"
 213 then
 214         taglist=$(IFS=" " &&
 215                   git-ls-remote $upload_pack --tags "$remote" |
 216                   while read sha1 name
 217                   do
 218                         case "$name" in
 219                         (*^*) continue ;;
 220                         esac
 221                         if git-check-ref-format "$name"
 222                         then
 223                             echo ".${name}:${name}"
 224                         else
 225                             echo >&2 "warning: tag ${name} ignored"
 226                         fi
 227                   done)
 228         if test "$#" -gt 1
 229         then
 230                 # remote URL plus explicit refspecs; we need to merge them.
 231                 reflist="$reflist$LF$taglist"
 232         else
 233                 # No explicit refspecs; fetch tags only.
 234                 reflist=$taglist
 235         fi
 236 fi
 237
 238 fetch_main () {
 239   reflist="$1"
 240   refs=
 241
 242   for ref in $reflist
 243   do
 244       refs="$refs$LF$ref"
 245
 246       # These are relative path from $GIT_DIR, typically starting at refs/
 247       # but may be HEAD
 248       if expr "z$ref" : 'z\.' >/dev/null
 249       then
 250           not_for_merge=t
 251           ref=$(expr "z$ref" : 'z\.\(.*\)')
 252       else
 253           not_for_merge=
 254       fi
 255       if expr "z$ref" : 'z+' >/dev/null
 256       then
 257           single_force=t
 258           ref=$(expr "z$ref" : 'z+\(.*\)')
 259       else
 260           single_force=
 261       fi
 262       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 263       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 264
 265       rref="$rref$LF$remote_name"
 266
 267       # There are transports that can fetch only one head at a time...
 268       case "$remote" in
 269       http://* | https://*)
 270           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 271               curl_extra_args="-k"
 272           fi
 273           max_depth=5
 274           depth=0
 275           head="ref: $remote_name"
 276           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 277           do
 278             remote_name_quoted=$(perl -e '
 279               my $u = $ARGV[0];
 280               $u =~ s/^ref:\s*//;
 281               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 282               print "$u";
 283           ' "$head")
 284             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 285             depth=$( expr \( $depth + 1 \) )
 286           done
 287           expr "z$head" : "z$_x40\$" >/dev/null ||
 288               die "Failed to fetch $remote_name from $remote"
 289           echo >&2 Fetching "$remote_name from $remote" using http
 290           git-http-fetch -v -a "$head" "$remote/" || exit
 291           ;;
 292       rsync://*)
 293           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 294           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 295           head=$(git-rev-parse --verify TMP_HEAD)
 296           rm -f "$TMP_HEAD"
 297           test "$rsync_slurped_objects" || {
 298               rsync -av --ignore-existing --exclude info \
 299                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 300
 301               # Look at objects/info/alternates for rsync -- http will
 302               # support it natively and git native ones will do it on
 303               # the remote end.  Not having that file is not a crime.
 304               rsync -q "$remote/objects/info/alternates" \
 305                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 306                   rm -f "$GIT_DIR/TMP_ALT"
 307               if test -f "$GIT_DIR/TMP_ALT"
 308               then
 309                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 310                   while read alt
 311                   do
 312                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 313                       echo >&2 "Getting alternate: $alt"
 314                       rsync -av --ignore-existing --exclude info \
 315                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 316                   done
 317                   rm -f "$GIT_DIR/TMP_ALT"
 318               fi
 319               rsync_slurped_objects=t
 320           }
 321           ;;
 322       *)
 323           # We will do git native transport with just one call later.
 324           continue ;;
 325       esac
 326
 327       append_fetch_head "$head" "$remote" \
 328           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 329
 330   done
 331
 332   case "$remote" in
 333   http://* | https://* | rsync://* )
 334       ;; # we are already done.
 335   *)
 336     ( : subshell because we muck with IFS
 337       IFS="     $LF"
 338       (
 339           git-fetch-pack $exec $keep --thin "$remote" $rref || echo failed "$remote"
 340       ) |
 341       while read sha1 remote_name
 342       do
 343           case "$sha1" in
 344           failed)
 345                   echo >&2 "Fetch failure: $remote"
 346                   exit 1 ;;
 347           esac
 348           found=
 349           single_force=
 350           for ref in $refs
 351           do
 352               case "$ref" in
 353               +$remote_name:*)
 354                   single_force=t
 355                   not_for_merge=
 356                   found="$ref"
 357                   break ;;
 358               .+$remote_name:*)
 359                   single_force=t
 360                   not_for_merge=t
 361                   found="$ref"
 362                   break ;;
 363               .$remote_name:*)
 364                   not_for_merge=t
 365                   found="$ref"
 366                   break ;;
 367               $remote_name:*)
 368                   not_for_merge=
 369                   found="$ref"
 370                   break ;;
 371               esac
 372           done
 373           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 374           append_fetch_head "$sha1" "$remote" \
 375                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 376       done
 377     ) || exit ;;
 378   esac
 379
 380 }
 381
 382 fetch_main "$reflist"
 383
 384 # automated tag following
 385 case "$no_tags$tags" in
 386 '')
 387         case "$reflist" in
 388         *:refs/*)
 389                 # effective only when we are following remote branch
 390                 # using local tracking branch.
 391                 taglist=$(IFS=" " &&
 392                 git-ls-remote $upload_pack --tags "$remote" |
 393                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 394                 while read sha1 name
 395                 do
 396                         test -f "$GIT_DIR/$name" && continue
 397                         git-check-ref-format "$name" || {
 398                                 echo >&2 "warning: tag ${name} ignored"
 399                                 continue
 400                         }
 401                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 402                         echo >&2 "Auto-following $name"
 403                         echo ".${name}:${name}"
 404                 done)
 405         esac
 406         case "$taglist" in
 407         '') ;;
 408         ?*)
 409                 fetch_main "$taglist" ;;
 410         esac
 411 esac
 412
 413 # If the original head was empty (i.e. no "master" yet), or
 414 # if we were told not to worry, we do not have to check.
 415 case ",$update_head_ok,$orig_head," in
 416 *,, | t,* )
 417         ;;
 418 *)
 419         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 420         if test "$curr_head" != "$orig_head"
 421         then
 422                 git-update-ref HEAD "$orig_head"
 423                 die "Cannot fetch into the current branch."
 424         fi
 425         ;;
 426 esac