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