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     case "$1" in
  98     refs/tags/*)
  99         # Tags need not be pointing at commits so there
 100         # is no way to guarantee "fast-forward" anyway.
 101         if test -f "$GIT_DIR/$1"
 102         then
 103                 echo >&2 "* $1: updating with $3"
 104         else
 105                 echo >&2 "* $1: storing $3"
 106         fi
 107         echo "$2" >"$GIT_DIR/$1" ;;
 108
 109     refs/heads/*)
 110         # NEEDSWORK: use the same cmpxchg protocol here.
 111         echo "$2" >"$GIT_DIR/$1.lock"
 112         if test -f "$GIT_DIR/$1"
 113         then
 114             local=$(git-rev-parse --verify "$1^0") &&
 115             mb=$(git-merge-base "$local" "$2") &&
 116             case "$2,$mb" in
 117             $local,*)
 118                 echo >&2 "* $1: same as $3"
 119                 ;;
 120             *,$local)
 121                 echo >&2 "* $1: fast forward to $3"
 122                 ;;
 123             *)
 124                 false
 125                 ;;
 126             esac || {
 127                 echo >&2 "* $1: does not fast forward to $3;"
 128                 case "$force,$single_force" in
 129                 t,* | *,t)
 130                         echo >&2 "  forcing update."
 131                         ;;
 132                 *)
 133                         mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
 134                         echo >&2 "  leaving it in '$1.remote'"
 135                         ;;
 136                 esac
 137             }
 138         else
 139                 echo >&2 "* $1: storing $3"
 140         fi
 141         test -f "$GIT_DIR/$1.lock" &&
 142             mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
 143         ;;
 144     esac
 145 }
 146
 147 case "$update_head_ok" in
 148 '')
 149         orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 150         ;;
 151 esac
 152
 153 for ref in $(get_remote_refs_for_fetch "$@")
 154 do
 155     refs="$refs $ref"
 156
 157     # These are relative path from $GIT_DIR, typically starting at refs/
 158     # but may be HEAD
 159     if expr "$ref" : '\+' >/dev/null
 160     then
 161         single_force=t
 162         ref=$(expr "$ref" : '\+\(.*\)')
 163     else
 164         single_force=
 165     fi
 166     remote_name=$(expr "$ref" : '\([^:]*\):')
 167     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 168
 169     rref="$rref $remote_name"
 170
 171     # There are transports that can fetch only one head at a time...
 172     case "$remote" in
 173     http://* | https://*)
 174         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 175             curl_extra_args="-k"
 176         fi
 177         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 178         expr "$head" : "$_x40\$" >/dev/null ||
 179                 die "Failed to fetch $remote_name from $remote"
 180         echo Fetching "$remote_name from $remote" using http
 181         git-http-fetch -v -a "$head" "$remote/" || exit
 182         ;;
 183     rsync://*)
 184         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 185         rsync -L "$remote/$remote_name" "$TMP_HEAD" || exit 1
 186         head=$(git-rev-parse TMP_HEAD)
 187         rm -f "$TMP_HEAD"
 188         test "$rsync_slurped_objects" || {
 189             rsync -avz --ignore-existing "$remote/objects/" \
 190                 "$GIT_OBJECT_DIRECTORY/" || exit
 191             rsync_slurped_objects=t
 192         }
 193         ;;
 194     *)
 195         # We will do git native transport with just one call later.
 196         continue ;;
 197     esac
 198
 199     append_fetch_head "$head" "$remote" "$remote_name" "$remote_nick" "$local_name"
 200
 201 done
 202
 203 case "$remote" in
 204 http://* | https://* | rsync://* )
 205     ;; # we are already done.
 206 *)
 207     git-fetch-pack "$remote" $rref |
 208     while read sha1 remote_name
 209     do
 210         found=
 211         single_force=
 212         for ref in $refs
 213         do
 214             case "$ref" in
 215             +$remote_name:*)
 216                 single_force=t
 217                 found="$ref"
 218                 break ;;
 219             $remote_name:*)
 220                 found="$ref"
 221                 break ;;
 222             esac
 223         done
 224
 225         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 226         append_fetch_head "$sha1" "$remote" "$remote_name" "$remote_nick" "$local_name"
 227     done
 228     ;;
 229 esac
 230
 231 # If the original head was empty (i.e. no "master" yet), or
 232 # if we were told not to worry, we do not have to check.
 233 case ",$update_head_ok,$orig_head," in
 234 *,, | t,* )
 235         ;;
 236 *)
 237         curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 238         if test "$curr_head" != "$orig_head"
 239         then
 240                 echo "$orig_head" >$GIT_DIR/HEAD
 241                 die "Cannot fetch into the current branch."
 242         fi
 243         ;;
 244 esac