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