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 LF='
   9 '
  10 IFS="$LF"
  11
  12 tags=
  13 append=
  14 force=
  15 update_head_ok=
  16 while case "$#" in 0) break ;; esac
  17 do
  18         case "$1" in
  19         -a|--a|--ap|--app|--appe|--appen|--append)
  20                 append=t
  21                 ;;
  22         -f|--f|--fo|--for|--forc|--force)
  23                 force=t
  24                 ;;
  25         -t|--t|--ta|--tag|--tags)
  26                 tags=t
  27                 ;;
  28         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  29         --update-he|--update-hea|--update-head|--update-head-|\
  30         --update-head-o|--update-head-ok)
  31                 update_head_ok=t
  32                 ;;
  33         *)
  34                 break
  35                 ;;
  36         esac
  37         shift
  38 done
  39
  40 case "$#" in
  41 0)
  42         test -f "$GIT_DIR/branches/origin" ||
  43                 test -f "$GIT_DIR/remotes/origin" ||
  44                         die "Where do you want to fetch from today?"
  45         set origin ;;
  46 esac
  47
  48 remote_nick="$1"
  49 remote=$(get_remote_url "$@")
  50 refs=
  51 rref=
  52 rsync_slurped_objects=
  53
  54 if test "" = "$append"
  55 then
  56         : >"$GIT_DIR/FETCH_HEAD"
  57 fi
  58
  59 append_fetch_head () {
  60     head_="$1"
  61     remote_="$2"
  62     remote_name_="$3"
  63     remote_nick_="$4"
  64     local_name_="$5"
  65     case "$6" in
  66     t) not_for_merge_='not-for-merge' ;;
  67     '') not_for_merge_= ;;
  68     esac
  69
  70     # remote-nick is the URL given on the command line (or a shorthand)
  71     # remote-name is the $GIT_DIR relative refs/ path we computed
  72     # for this refspec.
  73     case "$remote_name_" in
  74     HEAD)
  75         note_= ;;
  76     refs/heads/*)
  77         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  78         note_="branch '$note_' of " ;;
  79     refs/tags/*)
  80         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  81         note_="tag '$note_' of " ;;
  82     *)
  83         note_="$remote_name of " ;;
  84     esac
  85     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
  86         remote_="$remote_1_"
  87     note_="$note_$remote_"
  88
  89     # 2.6.11-tree tag would not be happy to be fed to resolve.
  90     if git-cat-file commit "$head_" >/dev/null 2>&1
  91     then
  92         headc_=$(git-rev-parse --verify "$head_^0") || exit
  93         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
  94         echo >&2 "* committish: $head_"
  95         echo >&2 "  $note_"
  96     else
  97         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
  98         echo >&2 "* non-commit: $head_"
  99         echo >&2 "  $note_"
 100     fi
 101     if test "$local_name_" != ""
 102     then
 103         # We are storing the head locally.  Make sure that it is
 104         # a fast forward (aka "reverse push").
 105         fast_forward_local "$local_name_" "$head_" "$note_"
 106     fi
 107 }
 108
 109 fast_forward_local () {
 110     mkdir -p "$(dirname "$GIT_DIR/$1")"
 111     case "$1" in
 112     refs/tags/*)
 113         # Tags need not be pointing at commits so there
 114         # is no way to guarantee "fast-forward" anyway.
 115         if test -f "$GIT_DIR/$1"
 116         then
 117                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 118                 then
 119                         echo >&2 "* $1: same as $3"
 120                 else
 121                         echo >&2 "* $1: updating with $3"
 122                 fi
 123         else
 124                 echo >&2 "* $1: storing $3"
 125         fi
 126         git-update-ref "$1" "$2"
 127         ;;
 128
 129     refs/heads/*)
 130         # $1 is the ref being updated.
 131         # $2 is the new value for the ref.
 132         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 133         if test "$local"
 134         then
 135             # Require fast-forward.
 136             mb=$(git-merge-base "$local" "$2") &&
 137             case "$2,$mb" in
 138             $local,*)
 139                 echo >&2 "* $1: same as $3"
 140                 ;;
 141             *,$local)
 142                 echo >&2 "* $1: fast forward to $3"
 143                 git-update-ref "$1" "$2" "$local"
 144                 ;;
 145             *)
 146                 false
 147                 ;;
 148             esac || {
 149                 echo >&2 "* $1: does not fast forward to $3;"
 150                 case ",$force,$single_force," in
 151                 *,t,*)
 152                         echo >&2 "  forcing update."
 153                         git-update-ref "$1" "$2" "$local"
 154                         ;;
 155                 *)
 156                         echo >&2 "  not updating."
 157                         ;;
 158                 esac
 159             }
 160         else
 161             echo >&2 "* $1: storing $3"
 162             git-update-ref "$1" "$2"
 163         fi
 164         ;;
 165     esac
 166 }
 167
 168 case "$update_head_ok" in
 169 '')
 170         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 171         ;;
 172 esac
 173
 174 # If --tags (and later --heads or --all) is specified, then we are
 175 # not talking about defaults stored in Pull: line of remotes or
 176 # branches file, and just fetch those and refspecs explicitly given.
 177 # Otherwise we do what we always did.
 178
 179 reflist=$(get_remote_refs_for_fetch "$@")
 180 if test "$tags"
 181 then
 182         taglist=$(git-ls-remote --tags "$remote" |
 183                 sed -e '
 184                         /\^/d
 185                         s/^[^   ]*      //
 186                         s/.*/&:&/')
 187         if test "$#" -gt 1
 188         then
 189                 # remote URL plus explicit refspecs; we need to merge them.
 190                 reflist="$reflist$LF$taglist"
 191         else
 192                 # No explicit refspecs; fetch tags only.
 193                 reflist=$taglist
 194         fi
 195 fi
 196
 197 for ref in $reflist
 198 do
 199     refs="$refs$LF$ref"
 200
 201     # These are relative path from $GIT_DIR, typically starting at refs/
 202     # but may be HEAD
 203     if expr "$ref" : '\.' >/dev/null
 204     then
 205         not_for_merge=t
 206         ref=$(expr "$ref" : '\.\(.*\)')
 207     else
 208         not_for_merge=
 209     fi
 210     if expr "$ref" : '\+' >/dev/null
 211     then
 212         single_force=t
 213         ref=$(expr "$ref" : '\+\(.*\)')
 214     else
 215         single_force=
 216     fi
 217     remote_name=$(expr "$ref" : '\([^:]*\):')
 218     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 219
 220     rref="$rref$LF$remote_name"
 221
 222     # There are transports that can fetch only one head at a time...
 223     case "$remote" in
 224     http://* | https://*)
 225         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 226             curl_extra_args="-k"
 227         fi
 228         remote_name_quoted=$(perl -e '
 229             my $u = $ARGV[0];
 230             $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 231             print "$u";
 232         ' "$remote_name")
 233         head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 234         expr "$head" : "$_x40\$" >/dev/null ||
 235                 die "Failed to fetch $remote_name from $remote"
 236         echo >&2 Fetching "$remote_name from $remote" using http
 237         git-http-fetch -v -a "$head" "$remote/" || exit
 238         ;;
 239     rsync://*)
 240         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 241         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 242         head=$(git-rev-parse --verify TMP_HEAD)
 243         rm -f "$TMP_HEAD"
 244         test "$rsync_slurped_objects" || {
 245             rsync -av --ignore-existing --exclude info \
 246                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 247
 248             # Look at objects/info/alternates for rsync -- http will
 249             # support it natively and git native ones will do it on the remote
 250             # end.  Not having that file is not a crime.
 251             rsync -q "$remote/objects/info/alternates" \
 252                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 253                 rm -f "$GIT_DIR/TMP_ALT"
 254             if test -f "$GIT_DIR/TMP_ALT"
 255             then
 256                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 257                 while read alt
 258                 do
 259                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
 260                     echo >&2 "Getting alternate: $alt"
 261                     rsync -av --ignore-existing --exclude info \
 262                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 263                 done
 264                 rm -f "$GIT_DIR/TMP_ALT"
 265             fi
 266             rsync_slurped_objects=t
 267         }
 268         ;;
 269     *)
 270         # We will do git native transport with just one call later.
 271         continue ;;
 272     esac
 273
 274     append_fetch_head "$head" "$remote" \
 275         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 276
 277 done
 278
 279 case "$remote" in
 280 http://* | https://* | rsync://* )
 281     ;; # we are already done.
 282 *)
 283     IFS="       $LF"
 284     (
 285         git-fetch-pack "$remote" $rref || echo failed "$remote"
 286     ) |
 287     while read sha1 remote_name
 288     do
 289         case "$sha1" in
 290         failed)
 291                 echo >&2 "Fetch failure: $remote"
 292                 exit 1 ;;
 293         esac
 294         found=
 295         single_force=
 296         for ref in $refs
 297         do
 298             case "$ref" in
 299             +$remote_name:*)
 300                 single_force=t
 301                 not_for_merge=
 302                 found="$ref"
 303                 break ;;
 304             .+$remote_name:*)
 305                 single_force=t
 306                 not_for_merge=t
 307                 found="$ref"
 308                 break ;;
 309             .$remote_name:*)
 310                 not_for_merge=t
 311                 found="$ref"
 312                 break ;;
 313             $remote_name:*)
 314                 not_for_merge=
 315                 found="$ref"
 316                 break ;;
 317             esac
 318         done
 319         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 320         append_fetch_head "$sha1" "$remote" \
 321                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 322     done || exit
 323     ;;
 324 esac
 325
 326 # If the original head was empty (i.e. no "master" yet), or
 327 # if we were told not to worry, we do not have to check.
 328 case ",$update_head_ok,$orig_head," in
 329 *,, | t,* )
 330         ;;
 331 *)
 332         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 333         if test "$curr_head" != "$orig_head"
 334         then
 335                 git-update-ref HEAD "$orig_head"
 336                 die "Cannot fetch into the current branch."
 337         fi
 338         ;;
 339 esac