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     case "$6" in
  58     t) not_for_merge_='not-for-merge' ;;
  59     '') not_for_merge_= ;;
  60     esac
  61
  62     # remote-nick is the URL given on the command line (or a shorthand)
  63     # remote-name is the $GIT_DIR relative refs/ path we computed
  64     # for this refspec.
  65     case "$remote_name_" in
  66     HEAD)
  67         note_= ;;
  68     refs/heads/*)
  69         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  70         note_="branch '$note_' of " ;;
  71     refs/tags/*)
  72         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  73         note_="tag '$note_' of " ;;
  74     *)
  75         note_="$remote_name of " ;;
  76     esac
  77     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
  78         remote_="$remote_1_"
  79     note_="$note_$remote_"
  80
  81     # 2.6.11-tree tag would not be happy to be fed to resolve.
  82     if git-cat-file commit "$head_" >/dev/null 2>&1
  83     then
  84         headc_=$(git-rev-parse --verify "$head_^0") || exit
  85         echo "$headc_   $not_for_merge_ $note_" >>$GIT_DIR/FETCH_HEAD
  86         echo >&2 "* committish: $head_"
  87         echo >&2 "  $note_"
  88     else
  89         echo "$head_    not-for-merge   $note_" >>$GIT_DIR/FETCH_HEAD
  90         echo >&2 "* non-commit: $head_"
  91         echo >&2 "  $note_"
  92     fi
  93     if test "$local_name_" != ""
  94     then
  95         # We are storing the head locally.  Make sure that it is
  96         # a fast forward (aka "reverse push").
  97         fast_forward_local "$local_name_" "$head_" "$note_"
  98     fi
  99 }
 100
 101 fast_forward_local () {
 102     mkdir -p "$(dirname "$GIT_DIR/$1")"
 103     case "$1" in
 104     refs/tags/*)
 105         # Tags need not be pointing at commits so there
 106         # is no way to guarantee "fast-forward" anyway.
 107         if test -f "$GIT_DIR/$1"
 108         then
 109                 echo >&2 "* $1: updating with $3"
 110         else
 111                 echo >&2 "* $1: storing $3"
 112         fi
 113         echo "$2" >"$GIT_DIR/$1" ;;
 114
 115     refs/heads/*)
 116         # NEEDSWORK: use the same cmpxchg protocol here.
 117         echo "$2" >"$GIT_DIR/$1.lock"
 118         if test -f "$GIT_DIR/$1"
 119         then
 120             local=$(git-rev-parse --verify "$1^0") &&
 121             mb=$(git-merge-base "$local" "$2") &&
 122             case "$2,$mb" in
 123             $local,*)
 124                 echo >&2 "* $1: same as $3"
 125                 ;;
 126             *,$local)
 127                 echo >&2 "* $1: fast forward to $3"
 128                 ;;
 129             *)
 130                 false
 131                 ;;
 132             esac || {
 133                 echo >&2 "* $1: does not fast forward to $3;"
 134                 case "$force,$single_force" in
 135                 t,* | *,t)
 136                         echo >&2 "  forcing update."
 137                         ;;
 138                 *)
 139                         mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1.remote"
 140                         echo >&2 "  leaving it in '$1.remote'"
 141                         ;;
 142                 esac
 143             }
 144         else
 145                 echo >&2 "* $1: storing $3"
 146         fi
 147         test -f "$GIT_DIR/$1.lock" &&
 148             mv "$GIT_DIR/$1.lock" "$GIT_DIR/$1"
 149         ;;
 150     esac
 151 }
 152
 153 case "$update_head_ok" in
 154 '')
 155         orig_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 156         ;;
 157 esac
 158
 159 for ref in $(get_remote_refs_for_fetch "$@")
 160 do
 161     refs="$refs $ref"
 162
 163     # These are relative path from $GIT_DIR, typically starting at refs/
 164     # but may be HEAD
 165     if expr "$ref" : '\.' >/dev/null
 166     then
 167         not_for_merge=t
 168         ref=$(expr "$ref" : '\.\(.*\)')
 169     else
 170         not_for_merge=
 171     fi
 172     if expr "$ref" : '\+' >/dev/null
 173     then
 174         single_force=t
 175         ref=$(expr "$ref" : '\+\(.*\)')
 176     else
 177         single_force=
 178     fi
 179     remote_name=$(expr "$ref" : '\([^:]*\):')
 180     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 181
 182     rref="$rref $remote_name"
 183
 184     # There are transports that can fetch only one head at a time...
 185     case "$remote" in
 186     http://* | https://*)
 187         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 188             curl_extra_args="-k"
 189         fi
 190         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 191         expr "$head" : "$_x40\$" >/dev/null ||
 192                 die "Failed to fetch $remote_name from $remote"
 193         echo >&2 Fetching "$remote_name from $remote" using http
 194         git-http-fetch -v -a "$head" "$remote/" || exit
 195         ;;
 196     rsync://*)
 197         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 198         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 199         head=$(git-rev-parse TMP_HEAD)
 200         rm -f "$TMP_HEAD"
 201         test "$rsync_slurped_objects" || {
 202             rsync -av --ignore-existing --exclude info \
 203                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 204
 205             # Look at objects/info/alternates for rsync -- http will
 206             # support it natively and git native ones will do it on the remote
 207             # end.  Not having that file is not a crime.
 208             rsync -q "$remote/objects/info/alternates" \
 209                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 210                 rm -f "$GIT_DIR/TMP_ALT"
 211             if test -f "$GIT_DIR/TMP_ALT"
 212             then
 213                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 214                 while read alt
 215                 do
 216                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
 217                     echo >&2 "Getting alternate: $alt"
 218                     rsync -av --ignore-existing --exclude info \
 219                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 220                 done
 221                 rm -f "$GIT_DIR/TMP_ALT"
 222             fi
 223             rsync_slurped_objects=t
 224         }
 225         ;;
 226     *)
 227         # We will do git native transport with just one call later.
 228         continue ;;
 229     esac
 230
 231     append_fetch_head "$head" "$remote" \
 232         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 233
 234 done
 235
 236 case "$remote" in
 237 http://* | https://* | rsync://* )
 238     ;; # we are already done.
 239 *)
 240     (
 241         git-fetch-pack "$remote" $rref || echo failed "$remote"
 242     ) |
 243     while read sha1 remote_name
 244     do
 245         case "$sha1" in
 246         failed)
 247                 echo >&2 "Fetch failure: $remote"
 248                 exit 1 ;;
 249         esac
 250         found=
 251         single_force=
 252         for ref in $refs
 253         do
 254             case "$ref" in
 255             +$remote_name:*)
 256                 single_force=t
 257                 not_for_merge=
 258                 found="$ref"
 259                 break ;;
 260             .+$remote_name:*)
 261                 single_force=t
 262                 not_for_merge=t
 263                 found="$ref"
 264                 break ;;
 265             .$remote_name:*)
 266                 not_for_merge=t
 267                 found="$ref"
 268                 break ;;
 269             $remote_name:*)
 270                 not_for_merge=
 271                 found="$ref"
 272                 break ;;
 273             esac
 274         done
 275         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 276         append_fetch_head "$sha1" "$remote" \
 277                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 278     done || exit
 279     ;;
 280 esac
 281
 282 # If the original head was empty (i.e. no "master" yet), or
 283 # if we were told not to worry, we do not have to check.
 284 case ",$update_head_ok,$orig_head," in
 285 *,, | t,* )
 286         ;;
 287 *)
 288         curr_head=$(cat "$GIT_DIR/HEAD" 2>/dev/null)
 289         if test "$curr_head" != "$orig_head"
 290         then
 291                 echo "$orig_head" >$GIT_DIR/HEAD
 292                 die "Cannot fetch into the current branch."
 293         fi
 294         ;;
 295 esac