git-fetch.sh

   1 #!/bin/sh
   2 #
   3
   4 USAGE='<fetch-options> <repository> <refspec>...'
   5 . git-sh-setup
   6 . git-parse-remote
   7 _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
   8 _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
   9
  10 LF='
  11 '
  12 IFS="$LF"
  13
  14 tags=
  15 append=
  16 force=
  17 verbose=
  18 update_head_ok=
  19 while case "$#" in 0) break ;; esac
  20 do
  21         case "$1" in
  22         -a|--a|--ap|--app|--appe|--appen|--append)
  23                 append=t
  24                 ;;
  25         -f|--f|--fo|--for|--forc|--force)
  26                 force=t
  27                 ;;
  28         -t|--t|--ta|--tag|--tags)
  29                 tags=t
  30                 ;;
  31         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  32         --update-he|--update-hea|--update-head|--update-head-|\
  33         --update-head-o|--update-head-ok)
  34                 update_head_ok=t
  35                 ;;
  36         -v|--verbose)
  37                 verbose=Yes
  38                 ;;
  39         -*)
  40                 usage
  41                 ;;
  42         *)
  43                 break
  44                 ;;
  45         esac
  46         shift
  47 done
  48
  49 case "$#" in
  50 0)
  51         test -f "$GIT_DIR/branches/origin" ||
  52                 test -f "$GIT_DIR/remotes/origin" ||
  53                         die "Where do you want to fetch from today?"
  54         set origin ;;
  55 esac
  56
  57 remote_nick="$1"
  58 remote=$(get_remote_url "$@")
  59 refs=
  60 rref=
  61 rsync_slurped_objects=
  62
  63 if test "" = "$append"
  64 then
  65         : >"$GIT_DIR/FETCH_HEAD"
  66 fi
  67
  68 append_fetch_head () {
  69     head_="$1"
  70     remote_="$2"
  71     remote_name_="$3"
  72     remote_nick_="$4"
  73     local_name_="$5"
  74     case "$6" in
  75     t) not_for_merge_='not-for-merge' ;;
  76     '') not_for_merge_= ;;
  77     esac
  78
  79     # remote-nick is the URL given on the command line (or a shorthand)
  80     # remote-name is the $GIT_DIR relative refs/ path we computed
  81     # for this refspec.
  82     case "$remote_name_" in
  83     HEAD)
  84         note_= ;;
  85     refs/heads/*)
  86         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  87         note_="branch '$note_' of " ;;
  88     refs/tags/*)
  89         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  90         note_="tag '$note_' of " ;;
  91     *)
  92         note_="$remote_name of " ;;
  93     esac
  94     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
  95         remote_="$remote_1_"
  96     note_="$note_$remote_"
  97
  98     # 2.6.11-tree tag would not be happy to be fed to resolve.
  99     if git-cat-file commit "$head_" >/dev/null 2>&1
 100     then
 101         headc_=$(git-rev-parse --verify "$head_^0") || exit
 102         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 103         [ "$verbose" ] && echo >&2 "* committish: $head_"
 104         [ "$verbose" ] && echo >&2 "  $note_"
 105     else
 106         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 107         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 108         [ "$verbose" ] && echo >&2 "  $note_"
 109     fi
 110     if test "$local_name_" != ""
 111     then
 112         # We are storing the head locally.  Make sure that it is
 113         # a fast forward (aka "reverse push").
 114         fast_forward_local "$local_name_" "$head_" "$note_"
 115     fi
 116 }
 117
 118 fast_forward_local () {
 119     mkdir -p "$(dirname "$GIT_DIR/$1")"
 120     case "$1" in
 121     refs/tags/*)
 122         # Tags need not be pointing at commits so there
 123         # is no way to guarantee "fast-forward" anyway.
 124         if test -f "$GIT_DIR/$1"
 125         then
 126                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 127                 then
 128                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 129                 else
 130                         echo >&2 "* $1: updating with $3"
 131                 fi
 132         else
 133                 echo >&2 "* $1: storing $3"
 134         fi
 135         git-update-ref "$1" "$2"
 136         ;;
 137
 138     refs/heads/*)
 139         # $1 is the ref being updated.
 140         # $2 is the new value for the ref.
 141         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 142         if test "$local"
 143         then
 144             # Require fast-forward.
 145             mb=$(git-merge-base "$local" "$2") &&
 146             case "$2,$mb" in
 147             $local,*)
 148                 echo >&2 "* $1: same as $3"
 149                 ;;
 150             *,$local)
 151                 echo >&2 "* $1: fast forward to $3"
 152                 git-update-ref "$1" "$2" "$local"
 153                 ;;
 154             *)
 155                 false
 156                 ;;
 157             esac || {
 158                 echo >&2 "* $1: does not fast forward to $3;"
 159                 case ",$force,$single_force," in
 160                 *,t,*)
 161                         echo >&2 "  forcing update."
 162                         git-update-ref "$1" "$2" "$local"
 163                         ;;
 164                 *)
 165                         echo >&2 "  not updating."
 166                         ;;
 167                 esac
 168             }
 169         else
 170             echo >&2 "* $1: storing $3"
 171             git-update-ref "$1" "$2"
 172         fi
 173         ;;
 174     esac
 175 }
 176
 177 case "$update_head_ok" in
 178 '')
 179         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 180         ;;
 181 esac
 182
 183 # If --tags (and later --heads or --all) is specified, then we are
 184 # not talking about defaults stored in Pull: line of remotes or
 185 # branches file, and just fetch those and refspecs explicitly given.
 186 # Otherwise we do what we always did.
 187
 188 reflist=$(get_remote_refs_for_fetch "$@")
 189 if test "$tags"
 190 then
 191         taglist=$(git-ls-remote --tags "$remote" |
 192                 sed -e '
 193                         /\^/d
 194                         s/^[^   ]*      //
 195                         s/.*/.&:&/')
 196         if test "$#" -gt 1
 197         then
 198                 # remote URL plus explicit refspecs; we need to merge them.
 199                 reflist="$reflist$LF$taglist"
 200         else
 201                 # No explicit refspecs; fetch tags only.
 202                 reflist=$taglist
 203         fi
 204 fi
 205
 206 for ref in $reflist
 207 do
 208     refs="$refs$LF$ref"
 209
 210     # These are relative path from $GIT_DIR, typically starting at refs/
 211     # but may be HEAD
 212     if expr "$ref" : '\.' >/dev/null
 213     then
 214         not_for_merge=t
 215         ref=$(expr "$ref" : '\.\(.*\)')
 216     else
 217         not_for_merge=
 218     fi
 219     if expr "$ref" : '\+' >/dev/null
 220     then
 221         single_force=t
 222         ref=$(expr "$ref" : '\+\(.*\)')
 223     else
 224         single_force=
 225     fi
 226     remote_name=$(expr "$ref" : '\([^:]*\):')
 227     local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 228
 229     rref="$rref$LF$remote_name"
 230
 231     # There are transports that can fetch only one head at a time...
 232     case "$remote" in
 233     http://* | https://*)
 234         if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 235             curl_extra_args="-k"
 236         fi
 237         remote_name_quoted=$(perl -e '
 238             my $u = $ARGV[0];
 239             $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 240             print "$u";
 241         ' "$remote_name")
 242         head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 243         expr "$head" : "$_x40\$" >/dev/null ||
 244                 die "Failed to fetch $remote_name from $remote"
 245         echo >&2 Fetching "$remote_name from $remote" using http
 246         git-http-fetch -v -a "$head" "$remote/" || exit
 247         ;;
 248     rsync://*)
 249         TMP_HEAD="$GIT_DIR/TMP_HEAD"
 250         rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 251         head=$(git-rev-parse --verify TMP_HEAD)
 252         rm -f "$TMP_HEAD"
 253         test "$rsync_slurped_objects" || {
 254             rsync -av --ignore-existing --exclude info \
 255                 "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 256
 257             # Look at objects/info/alternates for rsync -- http will
 258             # support it natively and git native ones will do it on the remote
 259             # end.  Not having that file is not a crime.
 260             rsync -q "$remote/objects/info/alternates" \
 261                 "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 262                 rm -f "$GIT_DIR/TMP_ALT"
 263             if test -f "$GIT_DIR/TMP_ALT"
 264             then
 265                 resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 266                 while read alt
 267                 do
 268                     case "$alt" in 'bad alternate: '*) die "$alt";; esac
 269                     echo >&2 "Getting alternate: $alt"
 270                     rsync -av --ignore-existing --exclude info \
 271                     "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 272                 done
 273                 rm -f "$GIT_DIR/TMP_ALT"
 274             fi
 275             rsync_slurped_objects=t
 276         }
 277         ;;
 278     *)
 279         # We will do git native transport with just one call later.
 280         continue ;;
 281     esac
 282
 283     append_fetch_head "$head" "$remote" \
 284         "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 285
 286 done
 287
 288 case "$remote" in
 289 http://* | https://* | rsync://* )
 290     ;; # we are already done.
 291 *)
 292     IFS="       $LF"
 293     (
 294         git-fetch-pack "$remote" $rref || echo failed "$remote"
 295     ) |
 296     while read sha1 remote_name
 297     do
 298         case "$sha1" in
 299         failed)
 300                 echo >&2 "Fetch failure: $remote"
 301                 exit 1 ;;
 302         esac
 303         found=
 304         single_force=
 305         for ref in $refs
 306         do
 307             case "$ref" in
 308             +$remote_name:*)
 309                 single_force=t
 310                 not_for_merge=
 311                 found="$ref"
 312                 break ;;
 313             .+$remote_name:*)
 314                 single_force=t
 315                 not_for_merge=t
 316                 found="$ref"
 317                 break ;;
 318             .$remote_name:*)
 319                 not_for_merge=t
 320                 found="$ref"
 321                 break ;;
 322             $remote_name:*)
 323                 not_for_merge=
 324                 found="$ref"
 325                 break ;;
 326             esac
 327         done
 328         local_name=$(expr "$found" : '[^:]*:\(.*\)')
 329         append_fetch_head "$sha1" "$remote" \
 330                 "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 331     done || exit
 332     ;;
 333 esac
 334
 335 # If the original head was empty (i.e. no "master" yet), or
 336 # if we were told not to worry, we do not have to check.
 337 case ",$update_head_ok,$orig_head," in
 338 *,, | t,* )
 339         ;;
 340 *)
 341         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 342         if test "$curr_head" != "$orig_head"
 343         then
 344                 git-update-ref HEAD "$orig_head"
 345                 die "Cannot fetch into the current branch."
 346         fi
 347         ;;
 348 esac