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