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 force=
  10 while case "$#" in 0) break ;; esac
  11 do
  12         case "$1" in
  13         -a|--a|--ap|--app|--appe|--appen|--append)
  14                 append=t
  15                 shift
  16                 ;;
  17         -f|--f|--fo|--for|--forc|--force)
  18                 force=t
  19                 shift
  20                 ;;
  21         *)
  22                 break
  23                 ;;
  24         esac
  25 done
  26
  27 case "$#" in
  28 0)
  29         test -f "$GIT_DIR/branches/origin" ||
  30                 test -f "$GIT_DIR/remotes/origin" ||
  31                         die "Where do you want to fetch from?"
  32         set origin ;;
  33 esac
  34
  35 remote_nick="$1"
  36 remote=$(get_remote_url "$@")
  37 refs=
  38 rref=
  39 rsync_slurped_objects=
  40
  41 if test "" = "$append"
  42 then
  43         : >$GIT_DIR/FETCH_HEAD
  44 fi
  45
  46 append_fetch_head () {
  47     head_="$1"
  48     remote_="$2"
  49     remote_name_="$3"
  50     remote_nick_="$4"
  51     local_name_="$5"
  52
  53     # 2.6.11-tree tag would not be happy to be fed to resolve.
  54     if git-cat-file commit "$head_" >/dev/null 2>&1
  55     then
  56         head_=$(git-rev-parse --verify "$head_^0") || exit
  57         note_="$head_   $remote_name_ from $remote_nick_"
  58         echo "$note_" >>$GIT_DIR/FETCH_HEAD
  59         echo >&2 "* committish: $note_"
  60     else
  61         echo >&2 "* non-commit: $note_"
  62     fi
  63     if test "$local_name_" != ""
  64     then
  65         # We are storing the head locally.  Make sure that it is
  66         # a fast forward (aka "reverse push").
  67         fast_forward_local "$local_name_" "$head_" "$remote_" "$remote_name_"
  68     fi
  69 }
  70
  71 fast_forward_local () {
  72     case "$1" in
  73     refs/tags/*)
  74         # Tags need not be pointing at commits so there
  75         # is no way to guarantee "fast-forward" anyway.
  76         if test -f "$GIT_DIR/$1"
  77         then
  78                 echo >&2 "* $1: updating with $4"
  79                 echo >&2 "  from $3."
  80         else
  81                 echo >&2 "* $1: storing $4"
  82                 echo >&2 "  from $3."
  83         fi
  84         echo "$2" >"$GIT_DIR/$1" ;;
  85
  86     refs/heads/*)
  87         # NEEDSWORK: use the same cmpxchg protocol here.
  88         echo "$2" >"$GIT_DIR/$1.lock"
  89         if test -f "$GIT_DIR/$1"
  90         then
  91             local=$(git-rev-parse --verify "$1^0") &&
  92             mb=$(git-merge-base "$local" "$2") &&
  93             case "$2,$mb" in
  94             $local,*)
  95                 echo >&2 "* $1: same as $4"
  96                 echo >&2 "  from $3"
  97                 ;;
  98             *,$local)
  99                 echo >&2 "* $1: fast forward to $4"
 100                 echo >&2 "  from $3"
 101                 ;;
 102             *)
 103                 false
 104                 ;;
 105             esac || {
 106                 echo >&2 "* $1: does not fast forward to $4"
 107                 case "$force,$single_force" in
 108                 t,* | *,t)
 109                         echo >&2 "  from $3; forcing update."
 110                         ;;
 111                 *)
 112                         mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
 113                         echo >&2 "  from $3; leaving it in '$1.remote'"
 114                         ;;
 115                 esac
 116             }
 117         else
 118                 echo >&2 "* $1: storing $4"
 119                 echo >&2 "  from $3."
 120         fi
 121         test -f "$GIT_DIR/$1.lock" &&
 122             mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
 123         ;;
 124     esac
 125 }
 126
 127 for ref in $(get_remote_refs_for_fetch "$@")
 128 do
 129     refs="$refs $ref"
 130
 131     # These are relative path from $GIT_DIR, typically starting at refs/
 132     # but may be HEAD
 133     if expr "$ref" : '\+' >/dev/null
 134     then
 135         single_force=t
 136         ref=$(expr "$ref" : '\+\(.*\)')
 137     else
 138         single_force=
 139     fi
 140     remote_name=$(expr "$ref" : '\([^:]*\):')
 141     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 142
 143     rref="$rref $remote_name"
 144
 145     # There are transports that can fetch only one head at a time...
 146     case "$remote" in
 147     http://* | https://*)
 148         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 149             curl_extra_args="-k"
 150         fi
 151         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 152         expr "$head" : "$_x40\$" >/dev/null ||
 153             die "Failed to fetch $remote_name from $remote"
 154         echo Fetching "$remote_name from $remote" using http
 155         git-http-pull -v -a "$head" "$remote/" || exit
 156         ;;
 157     rsync://*)
 158         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 159         rsync -L "$remote/$remote_name" "$TMP_HEAD" || exit 1
 160         head=$(git-rev-parse TMP_HEAD)
 161         rm -f "$TMP_HEAD"
 162         test "$rsync_slurped_objects" || {
 163             rsync -avz --ignore-existing "$remote/objects/" \
 164                 "$GIT_OBJECT_DIRECTORY/" || exit
 165             rsync_slurped_objects=t
 166         }
 167         ;;
 168     *)
 169         # We will do git native transport with just one call later.
 170         continue ;;
 171     esac
 172
 173     append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
 174
 175 done
 176
 177 case "$remote" in
 178 http://* | https://* | rsync://* )
 179     ;; # we are already done.
 180 *)
 181     git-fetch-pack "$remote" $rref |
 182     while read sha1 remote_name
 183     do
 184         found=
 185         single_force=
 186         for ref in $refs
 187         do
 188             case "$ref" in
 189             +$remote_name:*)
 190                 single_force=t
 191                 found="$ref"
 192                 break ;;
 193             $remote_name:*)
 194                 found="$ref"
 195                 break ;;
 196             esac
 197         done
 198
 199         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 200         append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
 201     done
 202     ;;
 203 esac