git-fetch.sh

   1 #!/bin/sh
   2 #
   3 . git-sh-setup || die "Not a git archive"
   4 . git-parse-remote
   5 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
   6 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
   7
   8 LF='
   9 '
  10 IFS="$LF"
  11
  12 tags=
  13 append=
  14 force=
  15 update_head_ok=
  16 while case "$#" in 0) break ;; esac
  17 do
  18         case "$1" in
  19         -a|--a|--ap|--app|--appe|--appen|--append)
  20                 append=t
  21                 ;;
  22         -f|--f|--fo|--for|--forc|--force)
  23                 force=t
  24                 ;;
  25         -t|--t|--ta|--tag|--tags)
  26                 tags=t
  27                 ;;
  28         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  29         --update-he|--update-hea|--update-head|--update-head-|\
  30         --update-head-o|--update-head-ok)
  31                 update_head_ok=t
  32                 ;;
  33         *)
  34                 break
  35                 ;;
  36         esac
  37         shift
  38 done
  39
  40 case "$#" in
  41 0)
  42         test -f "$GIT_DIR/branches/origin" ||
  43                 test -f "$GIT_DIR/remotes/origin" ||
  44                         die "Where do you want to fetch from today?"
  45         set origin ;;
  46 esac
  47
  48 remote_nick="$1"
  49 remote=$(get_remote_url "$@")
  50 refs=
  51 rref=
  52 rsync_slurped_objects=
  53
  54 if test "" = "$append"
  55 then
  56         : >"$GIT_DIR/FETCH_HEAD"
  57 fi
  58
  59 append_fetch_head () {
  60     head_="$1"
  61     remote_="$2"
  62     remote_name_="$3"
  63     remote_nick_="$4"
  64     local_name_="$5"
  65     case "$6" in
  66     t) not_for_merge_='not-for-merge' ;;
  67     '') not_for_merge_= ;;
  68     esac
  69
  70     # remote-nick is the URL given on the command line (or a shorthand)
  71     # remote-name is the $GIT_DIR relative refs/ path we computed
  72     # for this refspec.
  73     case "$remote_name_" in
  74     HEAD)
  75         note_= ;;
  76     refs/heads/*)
  77         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  78         note_="branch '$note_' of " ;;
  79     refs/tags/*)
  80         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  81         note_="tag '$note_' of " ;;
  82     *)
  83         note_="$remote_name of " ;;
  84     esac
  85     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
  86         remote_="$remote_1_"
  87     note_="$note_$remote_"
  88
  89     # 2.6.11-tree tag would not be happy to be fed to resolve.
  90     if git-cat-file commit "$head_" >/dev/null 2>&1
  91     then
  92         headc_=$(git-rev-parse --verify "$head_^0") || exit
  93         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
  94         echo >&2 "* committish: $head_"
  95         echo >&2 "  $note_"
  96     else
  97         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
  98         echo >&2 "* non-commit: $head_"
  99         echo >&2 "  $note_"
 100     fi
 101     if test "$local_name_" != ""
 102     then
 103         # We are storing the head locally.  Make sure that it is
 104         # a fast forward (aka "reverse push").
 105         fast_forward_local "$local_name_" "$head_" "$note_"
 106     fi
 107 }
 108
 109 fast_forward_local () {
 110     mkdir -p "$(dirname "$GIT_DIR/$1")"
 111     case "$1" in
 112     refs/tags/*)
 113         # Tags need not be pointing at commits so there
 114         # is no way to guarantee "fast-forward" anyway.
 115         if test -f "$GIT_DIR/$1"
 116         then
 117                 echo >&2 "* $1: updating with $3"
 118         else
 119                 echo >&2 "* $1: storing $3"
 120         fi
 121         git-update-ref "$1" "$2"
 122         ;;
 123
 124     refs/heads/*)
 125         # $1 is the ref being updated.
 126         # $2 is the new value for the ref.
 127         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 128         if test "$local"
 129         then
 130             # Require fast-forward.
 131             mb=$(git-merge-base "$local" "$2") &&
 132             case "$2,$mb" in
 133             $local,*)
 134                 echo >&2 "* $1: same as $3"
 135                 ;;
 136             *,$local)
 137                 echo >&2 "* $1: fast forward to $3"
 138                 git-update-ref "$1" "$2" "$local"
 139                 ;;
 140             *)
 141                 false
 142                 ;;
 143             esac || {
 144                 echo >&2 "* $1: does not fast forward to $3;"
 145                 case ",$force,$single_force," in
 146                 *,t,*)
 147                         echo >&2 "  forcing update."
 148                         git-update-ref "$1" "$2" "$local"
 149                         ;;
 150                 *)
 151                         echo >&2 "  not updating."
 152                         ;;
 153                 esac
 154             }
 155         else
 156             echo >&2 "* $1: storing $3"
 157             git-update-ref "$1" "$2"
 158         fi
 159         ;;
 160     esac
 161 }
 162
 163 case "$update_head_ok" in
 164 '')
 165         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 166         ;;
 167 esac
 168
 169 # If --tags (and later --heads or --all) is specified, then we are
 170 # not talking about defaults stored in Pull: line of remotes or
 171 # branches file, and just fetch those and refspecs explicitly given.
 172 # Otherwise we do what we always did.
 173
 174 reflist=$(get_remote_refs_for_fetch "$@")
 175 if test "$tags"
 176 then
 177         taglist=$(git-ls-remote --tags "$remote" |
 178                 sed -e '
 179                         /\^{}$/d
 180                         s/^[^   ]*      //
 181                         s/.*/&:&/')
 182         if test "$#" -gt 1
 183         then
 184                 # remote URL plus explicit refspecs; we need to merge them.
 185                 reflist="$reflist$LF$taglist"
 186         else
 187                 # No explicit refspecs; fetch tags only.
 188                 reflist=$taglist
 189         fi
 190 fi
 191
 192 for ref in $reflist
 193 do
 194     refs="$refs$LF$ref"
 195
 196     # These are relative path from $GIT_DIR, typically starting at refs/
 197     # but may be HEAD
 198     if expr "$ref" : '\.' >/dev/null
 199     then
 200         not_for_merge=t
 201         ref=$(expr "$ref" : '\.\(.*\)')
 202     else
 203         not_for_merge=
 204     fi
 205     if expr "$ref" : '\+' >/dev/null
 206     then
 207         single_force=t
 208         ref=$(expr "$ref" : '\+\(.*\)')
 209     else
 210         single_force=
 211     fi
 212     remote_name=$(expr "$ref" : '\([^:]*\):')
 213     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 214
 215     rref="$rref$LF$remote_name"
 216
 217     # There are transports that can fetch only one head at a time...
 218     case "$remote" in
 219     http://* | https://*)
 220         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 221             curl_extra_args="-k"
 222         fi
 223         remote_name_quoted=$(perl -e '
 224             my $u = $ARGV[0];
 225             $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 226             print "$u";
 227         ' "$remote_name")
 228         head=$(curl -nsf $curl_extra_args "$remote/$remote_name_quoted") &&
 229         expr "$head" : "$_x40\$" >/dev/null ||
 230                 die "Failed to fetch $remote_name from $remote"
 231         echo >&2 Fetching "$remote_name from $remote" using http
 232         git-http-fetch -v -a "$head" "$remote/" || exit
 233         ;;
 234     rsync://*)
 235         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 236         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 237         head=$(git-rev-parse --verify TMP_HEAD)
 238         rm -f "$TMP_HEAD"
 239         test "$rsync_slurped_objects" || {
 240             rsync -av --ignore-existing --exclude info \
 241                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 242
 243             # Look at objects/info/alternates for rsync -- http will
 244             # support it natively and git native ones will do it on the remote
 245             # end.  Not having that file is not a crime.
 246             rsync -q "$remote/objects/info/alternates" \
 247                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 248                 rm -f "$GIT_DIR/TMP_ALT"
 249             if test -f "$GIT_DIR/TMP_ALT"
 250             then
 251                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 252                 while read alt
 253                 do
 254                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
 255                     echo >&2 "Getting alternate: $alt"
 256                     rsync -av --ignore-existing --exclude info \
 257                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 258                 done
 259                 rm -f "$GIT_DIR/TMP_ALT"
 260             fi
 261             rsync_slurped_objects=t
 262         }
 263         ;;
 264     *)
 265         # We will do git native transport with just one call later.
 266         continue ;;
 267     esac
 268
 269     append_fetch_head "$head" "$remote" \
 270         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 271
 272 done
 273
 274 case "$remote" in
 275 http://* | https://* | rsync://* )
 276     ;; # we are already done.
 277 *)
 278     IFS="       $LF"
 279     (
 280         git-fetch-pack "$remote" $rref || echo failed "$remote"
 281     ) |
 282     while read sha1 remote_name
 283     do
 284         case "$sha1" in
 285         failed)
 286                 echo >&2 "Fetch failure: $remote"
 287                 exit 1 ;;
 288         esac
 289         found=
 290         single_force=
 291         for ref in $refs
 292         do
 293             case "$ref" in
 294             +$remote_name:*)
 295                 single_force=t
 296                 not_for_merge=
 297                 found="$ref"
 298                 break ;;
 299             .+$remote_name:*)
 300                 single_force=t
 301                 not_for_merge=t
 302                 found="$ref"
 303                 break ;;
 304             .$remote_name:*)
 305                 not_for_merge=t
 306                 found="$ref"
 307                 break ;;
 308             $remote_name:*)
 309                 not_for_merge=
 310                 found="$ref"
 311                 break ;;
 312             esac
 313         done
 314         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 315         append_fetch_head "$sha1" "$remote" \
 316                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 317     done || exit
 318     ;;
 319 esac
 320
 321 # If the original head was empty (i.e. no "master" yet), or
 322 # if we were told not to worry, we do not have to check.
 323 case ",$update_head_ok,$orig_head," in
 324 *,, | t,* )
 325         ;;
 326 *)
 327         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 328         if test "$curr_head" != "$orig_head"
 329         then
 330                 git-update-ref HEAD "$orig_head"
 331                 die "Cannot fetch into the current branch."
 332         fi
 333         ;;
 334 esac