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="$LF"
  13
  14 rloga=fetch
  15 no_tags=
  16 tags=
  17 append=
  18 force=
  19 verbose=
  20 update_head_ok=
  21 exec=
  22 upload_pack=
  23 keep=--thin
  24 while case "$#" in 0) break ;; esac
  25 do
  26         case "$1" in
  27         -a|--a|--ap|--app|--appe|--appen|--append)
  28                 append=t
  29                 ;;
  30         --upl|--uplo|--uploa|--upload|--upload-|--upload-p|\
  31         --upload-pa|--upload-pac|--upload-pack)
  32                 shift
  33                 exec="--exec=$1"
  34                 upload_pack="-u $1"
  35                 ;;
  36         -f|--f|--fo|--for|--forc|--force)
  37                 force=t
  38                 ;;
  39         -t|--t|--ta|--tag|--tags)
  40                 tags=t
  41                 ;;
  42         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  43                 no_tags=t
  44                 ;;
  45         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  46         --update-he|--update-hea|--update-head|--update-head-|\
  47         --update-head-o|--update-head-ok)
  48                 update_head_ok=t
  49                 ;;
  50         -v|--verbose)
  51                 verbose=Yes
  52                 ;;
  53         -k|--k|--ke|--kee|--keep)
  54                 keep=--keep
  55                 ;;
  56         --reflog-action=*)
  57                 rloga=`expr "z$1" : 'z-[^=]*=\(.*\)'`
  58                 ;;
  59         -*)
  60                 usage
  61                 ;;
  62         *)
  63                 break
  64                 ;;
  65         esac
  66         shift
  67 done
  68
  69 case "$#" in
  70 0)
  71         test -f "$GIT_DIR/branches/origin" ||
  72                 test -f "$GIT_DIR/remotes/origin" ||
  73                         die "Where do you want to fetch from today?"
  74         set origin ;;
  75 esac
  76
  77 remote_nick="$1"
  78 remote=$(get_remote_url "$@")
  79 refs=
  80 rref=
  81 rsync_slurped_objects=
  82
  83 rloga="$rloga $remote_nick"
  84 test "$remote_nick" = "$remote" || rloga="$rloga $remote"
  85
  86 if test "" = "$append"
  87 then
  88         : >"$GIT_DIR/FETCH_HEAD"
  89 fi
  90
  91 append_fetch_head () {
  92     head_="$1"
  93     remote_="$2"
  94     remote_name_="$3"
  95     remote_nick_="$4"
  96     local_name_="$5"
  97     case "$6" in
  98     t) not_for_merge_='not-for-merge' ;;
  99     '') not_for_merge_= ;;
 100     esac
 101
 102     # remote-nick is the URL given on the command line (or a shorthand)
 103     # remote-name is the $GIT_DIR relative refs/ path we computed
 104     # for this refspec.
 105
 106     # the $note_ variable will be fed to git-fmt-merge-msg for further
 107     # processing.
 108     case "$remote_name_" in
 109     HEAD)
 110         note_= ;;
 111     refs/heads/*)
 112         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
 113         note_="branch '$note_' of " ;;
 114     refs/tags/*)
 115         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
 116         note_="tag '$note_' of " ;;
 117     refs/remotes/*)
 118         note_="$(expr "$remote_name_" : 'refs/remotes/\(.*\)')"
 119         note_="remote branch '$note_' of " ;;
 120     *)
 121         note_="$remote_name of " ;;
 122     esac
 123     remote_1_=$(expr "z$remote_" : 'z\(.*\)\.git/*$') &&
 124         remote_="$remote_1_"
 125     note_="$note_$remote_"
 126
 127     # 2.6.11-tree tag would not be happy to be fed to resolve.
 128     if git-cat-file commit "$head_" >/dev/null 2>&1
 129     then
 130         headc_=$(git-rev-parse --verify "$head_^0") || exit
 131         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 132         [ "$verbose" ] && echo >&2 "* committish: $head_"
 133         [ "$verbose" ] && echo >&2 "  $note_"
 134     else
 135         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 136         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 137         [ "$verbose" ] && echo >&2 "  $note_"
 138     fi
 139     if test "$local_name_" != ""
 140     then
 141         # We are storing the head locally.  Make sure that it is
 142         # a fast forward (aka "reverse push").
 143         fast_forward_local "$local_name_" "$head_" "$note_"
 144     fi
 145 }
 146
 147 fast_forward_local () {
 148     mkdir -p "$(dirname "$GIT_DIR/$1")"
 149     case "$1" in
 150     refs/tags/*)
 151         # Tags need not be pointing at commits so there
 152         # is no way to guarantee "fast-forward" anyway.
 153         if test -f "$GIT_DIR/$1"
 154         then
 155                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 156                 then
 157                         [ "$verbose" ] && echo >&2 "* $1: same as $3" ||:
 158                 else
 159                         echo >&2 "* $1: updating with $3"
 160                         git-update-ref -m "$rloga: updating tag" "$1" "$2"
 161                 fi
 162         else
 163                 echo >&2 "* $1: storing $3"
 164                 git-update-ref -m "$rloga: storing tag" "$1" "$2"
 165         fi
 166         ;;
 167
 168     refs/heads/* | refs/remotes/*)
 169         # $1 is the ref being updated.
 170         # $2 is the new value for the ref.
 171         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 172         if test "$local"
 173         then
 174             # Require fast-forward.
 175             mb=$(git-merge-base "$local" "$2") &&
 176             case "$2,$mb" in
 177             $local,*)
 178                 if test -n "$verbose"
 179                 then
 180                         echo >&2 "* $1: same as $3"
 181                 fi
 182                 ;;
 183             *,$local)
 184                 echo >&2 "* $1: fast forward to $3"
 185                 echo >&2 "  from $local to $2"
 186                 git-update-ref -m "$rloga: fast-forward" "$1" "$2" "$local"
 187                 ;;
 188             *)
 189                 false
 190                 ;;
 191             esac || {
 192                 echo >&2 "* $1: does not fast forward to $3;"
 193                 case ",$force,$single_force," in
 194                 *,t,*)
 195                         echo >&2 "  forcing update."
 196                         git-update-ref -m "$rloga: forced-update" "$1" "$2" "$local"
 197                         ;;
 198                 *)
 199                         echo >&2 "  not updating."
 200                         exit 1
 201                         ;;
 202                 esac
 203             }
 204         else
 205             echo >&2 "* $1: storing $3"
 206             git-update-ref -m "$rloga: storing head" "$1" "$2"
 207         fi
 208         ;;
 209     esac
 210 }
 211
 212 case "$update_head_ok" in
 213 '')
 214         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 215         ;;
 216 esac
 217
 218 # If --tags (and later --heads or --all) is specified, then we are
 219 # not talking about defaults stored in Pull: line of remotes or
 220 # branches file, and just fetch those and refspecs explicitly given.
 221 # Otherwise we do what we always did.
 222
 223 reflist=$(get_remote_refs_for_fetch "$@")
 224 if test "$tags"
 225 then
 226         taglist=`IFS="  " &&
 227                   git-ls-remote $upload_pack --tags "$remote" |
 228                   while read sha1 name
 229                   do
 230                         case "$name" in
 231                         *^*) continue ;;
 232                         esac
 233                         if git-check-ref-format "$name"
 234                         then
 235                             echo ".${name}:${name}"
 236                         else
 237                             echo >&2 "warning: tag ${name} ignored"
 238                         fi
 239                   done`
 240         if test "$#" -gt 1
 241         then
 242                 # remote URL plus explicit refspecs; we need to merge them.
 243                 reflist="$reflist$LF$taglist"
 244         else
 245                 # No explicit refspecs; fetch tags only.
 246                 reflist=$taglist
 247         fi
 248 fi
 249
 250 fetch_main () {
 251   reflist="$1"
 252   refs=
 253
 254   for ref in $reflist
 255   do
 256       refs="$refs$LF$ref"
 257
 258       # These are relative path from $GIT_DIR, typically starting at refs/
 259       # but may be HEAD
 260       if expr "z$ref" : 'z\.' >/dev/null
 261       then
 262           not_for_merge=t
 263           ref=$(expr "z$ref" : 'z\.\(.*\)')
 264       else
 265           not_for_merge=
 266       fi
 267       if expr "z$ref" : 'z+' >/dev/null
 268       then
 269           single_force=t
 270           ref=$(expr "z$ref" : 'z+\(.*\)')
 271       else
 272           single_force=
 273       fi
 274       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 275       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 276
 277       rref="$rref$LF$remote_name"
 278
 279       # There are transports that can fetch only one head at a time...
 280       case "$remote" in
 281       http://* | https://*)
 282           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 283               curl_extra_args="-k"
 284           fi
 285           max_depth=5
 286           depth=0
 287           head="ref: $remote_name"
 288           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 289           do
 290             remote_name_quoted=$(@@PERL@@ -e '
 291               my $u = $ARGV[0];
 292               $u =~ s/^ref:\s*//;
 293               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 294               print "$u";
 295           ' "$head")
 296             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 297             depth=$( expr \( $depth + 1 \) )
 298           done
 299           expr "z$head" : "z$_x40\$" >/dev/null ||
 300               die "Failed to fetch $remote_name from $remote"
 301           echo >&2 Fetching "$remote_name from $remote" using http
 302           git-http-fetch -v -a "$head" "$remote/" || exit
 303           ;;
 304       rsync://*)
 305           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 306           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 307           head=$(git-rev-parse --verify TMP_HEAD)
 308           rm -f "$TMP_HEAD"
 309           test "$rsync_slurped_objects" || {
 310               rsync -av --ignore-existing --exclude info \
 311                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 312
 313               # Look at objects/info/alternates for rsync -- http will
 314               # support it natively and git native ones will do it on
 315               # the remote end.  Not having that file is not a crime.
 316               rsync -q "$remote/objects/info/alternates" \
 317                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 318                   rm -f "$GIT_DIR/TMP_ALT"
 319               if test -f "$GIT_DIR/TMP_ALT"
 320               then
 321                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 322                   while read alt
 323                   do
 324                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 325                       echo >&2 "Getting alternate: $alt"
 326                       rsync -av --ignore-existing --exclude info \
 327                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 328                   done
 329                   rm -f "$GIT_DIR/TMP_ALT"
 330               fi
 331               rsync_slurped_objects=t
 332           }
 333           ;;
 334       *)
 335           # We will do git native transport with just one call later.
 336           continue ;;
 337       esac
 338
 339       append_fetch_head "$head" "$remote" \
 340           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 341
 342   done
 343
 344   case "$remote" in
 345   http://* | https://* | rsync://* )
 346       ;; # we are already done.
 347   *)
 348     ( : subshell because we muck with IFS
 349       IFS="     $LF"
 350       (
 351           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
 352       ) |
 353       while read sha1 remote_name
 354       do
 355           case "$sha1" in
 356           failed)
 357                   echo >&2 "Fetch failure: $remote"
 358                   exit 1 ;;
 359           esac
 360           found=
 361           single_force=
 362           for ref in $refs
 363           do
 364               case "$ref" in
 365               +$remote_name:*)
 366                   single_force=t
 367                   not_for_merge=
 368                   found="$ref"
 369                   break ;;
 370               .+$remote_name:*)
 371                   single_force=t
 372                   not_for_merge=t
 373                   found="$ref"
 374                   break ;;
 375               .$remote_name:*)
 376                   not_for_merge=t
 377                   found="$ref"
 378                   break ;;
 379               $remote_name:*)
 380                   not_for_merge=
 381                   found="$ref"
 382                   break ;;
 383               esac
 384           done
 385           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 386           append_fetch_head "$sha1" "$remote" \
 387                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 388       done
 389     ) || exit ;;
 390   esac
 391
 392 }
 393
 394 fetch_main "$reflist"
 395
 396 # automated tag following
 397 case "$no_tags$tags" in
 398 '')
 399         case "$reflist" in
 400         *:refs/*)
 401                 # effective only when we are following remote branch
 402                 # using local tracking branch.
 403                 taglist=$(IFS=" " &&
 404                 git-ls-remote $upload_pack --tags "$remote" |
 405                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 406                 while read sha1 name
 407                 do
 408                         test -f "$GIT_DIR/$name" && continue
 409                         git-check-ref-format "$name" || {
 410                                 echo >&2 "warning: tag ${name} ignored"
 411                                 continue
 412                         }
 413                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 414                         echo >&2 "Auto-following $name"
 415                         echo ".${name}:${name}"
 416                 done)
 417         esac
 418         case "$taglist" in
 419         '') ;;
 420         ?*)
 421                 fetch_main "$taglist" ;;
 422         esac
 423 esac
 424
 425 # If the original head was empty (i.e. no "master" yet), or
 426 # if we were told not to worry, we do not have to check.
 427 case ",$update_head_ok,$orig_head," in
 428 *,, | t,* )
 429         ;;
 430 *)
 431         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 432         if test "$curr_head" != "$orig_head"
 433         then
 434             git-update-ref \
 435                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 436                         HEAD "$orig_head"
 437                 die "Cannot fetch into the current branch."
 438         fi
 439         ;;
 440 esac