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         git-update-ref "$1" "$2"
 114         ;;
 115
 116     refs/heads/*)
 117         # $1 is the ref being updated.
 118         # $2 is the new value for the ref.
 119         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 120         if test "$local"
 121         then
 122             # Require fast-forward.
 123             mb=$(git-merge-base "$local" "$2") &&
 124             case "$2,$mb" in
 125             $local,*)
 126                 echo >&2 "* $1: same as $3"
 127                 ;;
 128             *,$local)
 129                 echo >&2 "* $1: fast forward to $3"
 130                 git-update-ref "$1" "$2" "$local"
 131                 ;;
 132             *)
 133                 false
 134                 ;;
 135             esac || {
 136                 echo >&2 "* $1: does not fast forward to $3;"
 137                 case ",$force,$single_force," in
 138                 *,t,*)
 139                         echo >&2 "  forcing update."
 140                         git-update-ref "$1" "$2" "$local"
 141                         ;;
 142                 *)
 143                         echo >&2 "  not updating."
 144                         ;;
 145                 esac
 146             }
 147         else
 148             echo >&2 "* $1: storing $3"
 149             git-update-ref "$1" "$2"
 150         fi
 151         ;;
 152     esac
 153 }
 154
 155 case "$update_head_ok" in
 156 '')
 157         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 158         ;;
 159 esac
 160
 161 for ref in $(get_remote_refs_for_fetch "$@")
 162 do
 163     refs="$refs $ref"
 164
 165     # These are relative path from $GIT_DIR, typically starting at refs/
 166     # but may be HEAD
 167     if expr "$ref" : '\.' >/dev/null
 168     then
 169         not_for_merge=t
 170         ref=$(expr "$ref" : '\.\(.*\)')
 171     else
 172         not_for_merge=
 173     fi
 174     if expr "$ref" : '\+' >/dev/null
 175     then
 176         single_force=t
 177         ref=$(expr "$ref" : '\+\(.*\)')
 178     else
 179         single_force=
 180     fi
 181     remote_name=$(expr "$ref" : '\([^:]*\):')
 182     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 183
 184     rref="$rref $remote_name"
 185
 186     # There are transports that can fetch only one head at a time...
 187     case "$remote" in
 188     http://* | https://*)
 189         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 190             curl_extra_args="-k"
 191         fi
 192         head=$(curl -nsf $curl_extra_args "$remote/$remote_name") &&
 193         expr "$head" : "$_x40\$" >/dev/null ||
 194                 die "Failed to fetch $remote_name from $remote"
 195         echo >&2 Fetching "$remote_name from $remote" using http
 196         git-http-fetch -v -a "$head" "$remote/" || exit
 197         ;;
 198     rsync://*)
 199         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 200         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 201         head=$(git-rev-parse --verify TMP_HEAD)
 202         rm -f "$TMP_HEAD"
 203         test "$rsync_slurped_objects" || {
 204             rsync -av --ignore-existing --exclude info \
 205                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 206
 207             # Look at objects/info/alternates for rsync -- http will
 208             # support it natively and git native ones will do it on the remote
 209             # end.  Not having that file is not a crime.
 210             rsync -q "$remote/objects/info/alternates" \
 211                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 212                 rm -f "$GIT_DIR/TMP_ALT"
 213             if test -f "$GIT_DIR/TMP_ALT"
 214             then
 215                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 216                 while read alt
 217                 do
 218                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
 219                     echo >&2 "Getting alternate: $alt"
 220                     rsync -av --ignore-existing --exclude info \
 221                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 222                 done
 223                 rm -f "$GIT_DIR/TMP_ALT"
 224             fi
 225             rsync_slurped_objects=t
 226         }
 227         ;;
 228     *)
 229         # We will do git native transport with just one call later.
 230         continue ;;
 231     esac
 232
 233     append_fetch_head "$head" "$remote" \
 234         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 235
 236 done
 237
 238 case "$remote" in
 239 http://* | https://* | rsync://* )
 240     ;; # we are already done.
 241 *)
 242     (
 243         git-fetch-pack "$remote" $rref || echo failed "$remote"
 244     ) |
 245     while read sha1 remote_name
 246     do
 247         case "$sha1" in
 248         failed)
 249                 echo >&2 "Fetch failure: $remote"
 250                 exit 1 ;;
 251         esac
 252         found=
 253         single_force=
 254         for ref in $refs
 255         do
 256             case "$ref" in
 257             +$remote_name:*)
 258                 single_force=t
 259                 not_for_merge=
 260                 found="$ref"
 261                 break ;;
 262             .+$remote_name:*)
 263                 single_force=t
 264                 not_for_merge=t
 265                 found="$ref"
 266                 break ;;
 267             .$remote_name:*)
 268                 not_for_merge=t
 269                 found="$ref"
 270                 break ;;
 271             $remote_name:*)
 272                 not_for_merge=
 273                 found="$ref"
 274                 break ;;
 275             esac
 276         done
 277         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 278         append_fetch_head "$sha1" "$remote" \
 279                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 280     done || exit
 281     ;;
 282 esac
 283
 284 # If the original head was empty (i.e. no "master" yet), or
 285 # if we were told not to worry, we do not have to check.
 286 case ",$update_head_ok,$orig_head," in
 287 *,, | t,* )
 288         ;;
 289 *)
 290         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 291         if test "$curr_head" != "$orig_head"
 292         then
 293                 git-update-ref HEAD "$orig_head"
 294                 die "Cannot fetch into the current branch."
 295         fi
 296         ;;
 297 esac