git-fetch-script

   1 #!/bin/sh
   2 #
   3 . git-sh-setup-script || die "Not a git archive"
   4 . git-parse-remote-script
   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 case "$#" in
  10 0)
  11         test -f "$GIT_DIR/branches/origin" ||
  12                 test -f "$GIT_DIR/remotes/origin" ||
  13                         die "Where do you want to fetch from?"
  14         set origin ;;
  15 *)
  16         case "$1" in
  17         -a|--a|--ap|--app|--appe|--appen|--append)
  18                 append=t
  19                 shift ;;
  20         esac
  21 esac
  22 remote_nick="$1"
  23 remote=$(get_remote_url "$@")
  24 refs=
  25 rref=
  26 rsync_slurped_objects=
  27
  28 if test "" = "$append"
  29 then
  30         : >$GIT_DIR/FETCH_HEAD
  31 fi
  32
  33 append_fetch_head () {
  34     head_="$1"
  35     remote_="$2"
  36     remote_name_="$3"
  37     remote_nick_="$4"
  38     local_name_="$5"
  39
  40     # 2.6.11-tree tag would not be happy to be fed to resolve.
  41     if git-cat-file commit "$head_" >/dev/null 2>&1
  42     then
  43         head_=$(git-rev-parse --verify "$head_^0") || exit
  44         note_="$head_   $remote_name_ from $remote_nick_"
  45         echo "$note_" >>$GIT_DIR/FETCH_HEAD
  46         echo >&2 "* committish: $note_"
  47     else
  48         echo >&2 "* non-commit: $note_"
  49     fi
  50     if test "$local_name_" != ""
  51     then
  52         # We are storing the head locally.  Make sure that it is
  53         # a fast forward (aka "reverse push").
  54         fast_forward_local "$local_name_" "$head_" "$remote_" "$remote_name_"
  55     fi
  56 }
  57
  58 fast_forward_local () {
  59     case "$1" in
  60     refs/tags/*)
  61         # Tags need not be pointing at commits so there
  62         # is no way to guarantee "fast-forward" anyway.
  63         echo "$2" >"$GIT_DIR/$1" ;;
  64     refs/heads/*)
  65         # NEEDSWORK: use the same cmpxchg protocol here.
  66         echo "$2" >"$GIT_DIR/$1.lock"
  67         if test -f "$GIT_DIR/$1"
  68         then
  69             local=$(git-rev-parse --verify "$1^0") &&
  70             mb=$(git-merge-base "$local" "$2") &&
  71             case "$2,$mb" in
  72             $local,*)
  73                 echo >&2 "* $1: same as $4"
  74                 echo >&2 "  from $3"
  75                 ;;
  76             *,$local)
  77                 echo >&2 "* $1: fast forward to $4"
  78                 echo >&2 "  from $3"
  79                 ;;
  80             *)
  81                 false
  82                 ;;
  83             esac || {
  84                 mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
  85                 echo >&2 "* $1: does not fast forward to $4"
  86                 echo >&2 "  from $3; leaving it in '$1.remote'"
  87             }
  88         else
  89                 echo >&2 "* $1: storing $4"
  90                 echo >&2 "  from $3."
  91         fi
  92         test -f "$GIT_DIR/$1.lock" &&
  93             mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
  94         ;;
  95     esac
  96 }
  97
  98 for ref in $(get_remote_refs_for_fetch "$@")
  99 do
 100     refs="$refs $ref"
 101
 102     # These are relative path from $GIT_DIR, typically starting at refs/
 103     # but may be HEAD
 104     remote_name=$(expr "$ref" : '\([^:]*\):')
 105     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 106
 107     rref="$rref $remote_name"
 108
 109     # There are transports that can fetch only one head at a time...
 110     case "$remote" in
 111     http://* | https://*)
 112         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 113             curl_extra_args="-k"
 114         fi
 115         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 116         expr "$head" : "$_x40\$" >/dev/null ||
 117             die "Failed to fetch $remote_name from $remote"
 118         echo Fetching "$remote_name from $remote" using http
 119         git-http-pull -v -a "$head" "$remote/" || exit
 120         ;;
 121     rsync://*)
 122         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 123         rsync -L "$remote/$remote_name" "$TMP_HEAD" || exit 1
 124         head=$(git-rev-parse TMP_HEAD)
 125         rm -f "$TMP_HEAD"
 126         test "$rsync_slurped_objects" || {
 127             rsync -avz --ignore-existing "$remote/objects/" \
 128                 "$GIT_OBJECT_DIRECTORY/" || exit
 129             rsync_slurped_objects=t
 130         }
 131         ;;
 132     *)
 133         # We will do git native transport with just one call later.
 134         continue ;;
 135     esac
 136
 137     append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
 138
 139 done
 140
 141 case "$remote" in
 142 http://* | https://* | rsync://* )
 143     ;; # we are already done.
 144 *)
 145     git-fetch-pack "$remote" $rref |
 146     while read sha1 remote_name
 147     do
 148         found=
 149         for ref in $refs
 150         do
 151             case "$ref" in
 152             $remote_name:*)
 153                 found="$ref"
 154                 break ;;
 155             esac
 156         done
 157
 158         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 159         append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
 160     done
 161     ;;
 162 esac