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 "$#" in
  70 0)
  71         origin=$(get_default_remote)
  72         test -n "$(get_remote_url ${origin})" ||
  73                 die "Where do you want to fetch from today?"
  74         set x $origin ; shift ;;
  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                   (
 228                         git-ls-remote $upload_pack --tags "$remote" ||
 229                         echo fail ouch
 230                   ) |
 231                   while read sha1 name
 232                   do
 233                         case "$sha1" in
 234                         fail)
 235                                 exit 1
 236                         esac
 237                         case "$name" in
 238                         *^*) continue ;;
 239                         esac
 240                         if git-check-ref-format "$name"
 241                         then
 242                             echo ".${name}:${name}"
 243                         else
 244                             echo >&2 "warning: tag ${name} ignored"
 245                         fi
 246                   done` || exit
 247         if test "$#" -gt 1
 248         then
 249                 # remote URL plus explicit refspecs; we need to merge them.
 250                 reflist="$reflist$LF$taglist"
 251         else
 252                 # No explicit refspecs; fetch tags only.
 253                 reflist=$taglist
 254         fi
 255 fi
 256
 257 fetch_main () {
 258   reflist="$1"
 259   refs=
 260
 261   for ref in $reflist
 262   do
 263       refs="$refs$LF$ref"
 264
 265       # These are relative path from $GIT_DIR, typically starting at refs/
 266       # but may be HEAD
 267       if expr "z$ref" : 'z\.' >/dev/null
 268       then
 269           not_for_merge=t
 270           ref=$(expr "z$ref" : 'z\.\(.*\)')
 271       else
 272           not_for_merge=
 273       fi
 274       if expr "z$ref" : 'z+' >/dev/null
 275       then
 276           single_force=t
 277           ref=$(expr "z$ref" : 'z+\(.*\)')
 278       else
 279           single_force=
 280       fi
 281       remote_name=$(expr "z$ref" : 'z\([^:]*\):')
 282       local_name=$(expr "z$ref" : 'z[^:]*:\(.*\)')
 283
 284       rref="$rref$LF$remote_name"
 285
 286       # There are transports that can fetch only one head at a time...
 287       case "$remote" in
 288       http://* | https://* | ftp://*)
 289           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 290               curl_extra_args="-k"
 291           fi
 292           max_depth=5
 293           depth=0
 294           head="ref: $remote_name"
 295           while (expr "z$head" : "zref:" && expr $depth \< $max_depth) >/dev/null
 296           do
 297             remote_name_quoted=$(@@PERL@@ -e '
 298               my $u = $ARGV[0];
 299               $u =~ s/^ref:\s*//;
 300               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 301               print "$u";
 302           ' "$head")
 303             head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted")
 304             depth=$( expr \( $depth + 1 \) )
 305           done
 306           expr "z$head" : "z$_x40\$" >/dev/null ||
 307               die "Failed to fetch $remote_name from $remote"
 308           echo >&2 Fetching "$remote_name from $remote" using http
 309           git-http-fetch -v -a "$head" "$remote/" || exit
 310           ;;
 311       rsync://*)
 312           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 313           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 314           head=$(git-rev-parse --verify TMP_HEAD)
 315           rm -f "$TMP_HEAD"
 316           test "$rsync_slurped_objects" || {
 317               rsync -av --ignore-existing --exclude info \
 318                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 319
 320               # Look at objects/info/alternates for rsync -- http will
 321               # support it natively and git native ones will do it on
 322               # the remote end.  Not having that file is not a crime.
 323               rsync -q "$remote/objects/info/alternates" \
 324                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 325                   rm -f "$GIT_DIR/TMP_ALT"
 326               if test -f "$GIT_DIR/TMP_ALT"
 327               then
 328                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 329                   while read alt
 330                   do
 331                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 332                       echo >&2 "Getting alternate: $alt"
 333                       rsync -av --ignore-existing --exclude info \
 334                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 335                   done
 336                   rm -f "$GIT_DIR/TMP_ALT"
 337               fi
 338               rsync_slurped_objects=t
 339           }
 340           ;;
 341       *)
 342           # We will do git native transport with just one call later.
 343           continue ;;
 344       esac
 345
 346       append_fetch_head "$head" "$remote" \
 347           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 348
 349   done
 350
 351   case "$remote" in
 352   http://* | https://* | ftp://* | rsync://* )
 353       ;; # we are already done.
 354   *)
 355     ( : subshell because we muck with IFS
 356       IFS="     $LF"
 357       (
 358           git-fetch-pack $exec $keep "$remote" $rref || echo failed "$remote"
 359       ) |
 360       while read sha1 remote_name
 361       do
 362           case "$sha1" in
 363           failed)
 364                   echo >&2 "Fetch failure: $remote"
 365                   exit 1 ;;
 366           esac
 367           found=
 368           single_force=
 369           for ref in $refs
 370           do
 371               case "$ref" in
 372               +$remote_name:*)
 373                   single_force=t
 374                   not_for_merge=
 375                   found="$ref"
 376                   break ;;
 377               .+$remote_name:*)
 378                   single_force=t
 379                   not_for_merge=t
 380                   found="$ref"
 381                   break ;;
 382               .$remote_name:*)
 383                   not_for_merge=t
 384                   found="$ref"
 385                   break ;;
 386               $remote_name:*)
 387                   not_for_merge=
 388                   found="$ref"
 389                   break ;;
 390               esac
 391           done
 392           local_name=$(expr "z$found" : 'z[^:]*:\(.*\)')
 393           append_fetch_head "$sha1" "$remote" \
 394                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 395       done
 396     ) || exit ;;
 397   esac
 398
 399 }
 400
 401 fetch_main "$reflist"
 402
 403 # automated tag following
 404 case "$no_tags$tags" in
 405 '')
 406         case "$reflist" in
 407         *:refs/*)
 408                 # effective only when we are following remote branch
 409                 # using local tracking branch.
 410                 taglist=$(IFS=" " &&
 411                 git-ls-remote $upload_pack --tags "$remote" |
 412                 sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 413                 while read sha1 name
 414                 do
 415                         test -f "$GIT_DIR/$name" && continue
 416                         git-check-ref-format "$name" || {
 417                                 echo >&2 "warning: tag ${name} ignored"
 418                                 continue
 419                         }
 420                         git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 421                         echo >&2 "Auto-following $name"
 422                         echo ".${name}:${name}"
 423                 done)
 424         esac
 425         case "$taglist" in
 426         '') ;;
 427         ?*)
 428                 fetch_main "$taglist" ;;
 429         esac
 430 esac
 431
 432 # If the original head was empty (i.e. no "master" yet), or
 433 # if we were told not to worry, we do not have to check.
 434 case ",$update_head_ok,$orig_head," in
 435 *,, | t,* )
 436         ;;
 437 *)
 438         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 439         if test "$curr_head" != "$orig_head"
 440         then
 441             git-update-ref \
 442                         -m "$rloga: Undoing incorrectly fetched HEAD." \
 443                         HEAD "$orig_head"
 444                 die "Cannot fetch into the current branch."
 445         fi
 446         ;;
 447 esac