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="$LF"
  13
  14 no_tags=
  15 tags=
  16 append=
  17 force=
  18 verbose=
  19 update_head_ok=
  20 while case "$#" in 0) break ;; esac
  21 do
  22         case "$1" in
  23         -a|--a|--ap|--app|--appe|--appen|--append)
  24                 append=t
  25                 ;;
  26         -f|--f|--fo|--for|--forc|--force)
  27                 force=t
  28                 ;;
  29         -t|--t|--ta|--tag|--tags)
  30                 tags=t
  31                 ;;
  32         -n|--n|--no|--no-|--no-t|--no-ta|--no-tag|--no-tags)
  33                 no_tags=t
  34                 ;;
  35         -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  36         --update-he|--update-hea|--update-head|--update-head-|\
  37         --update-head-o|--update-head-ok)
  38                 update_head_ok=t
  39                 ;;
  40         -v|--verbose)
  41                 verbose=Yes
  42                 ;;
  43         -k|--k|--ke|--kee|--keep)
  44                 keep=--keep
  45                 ;;
  46         -*)
  47                 usage
  48                 ;;
  49         *)
  50                 break
  51                 ;;
  52         esac
  53         shift
  54 done
  55
  56 case "$#" in
  57 0)
  58         test -f "$GIT_DIR/branches/origin" ||
  59                 test -f "$GIT_DIR/remotes/origin" ||
  60                         die "Where do you want to fetch from today?"
  61         set origin ;;
  62 esac
  63
  64 remote_nick="$1"
  65 remote=$(get_remote_url "$@")
  66 refs=
  67 rref=
  68 rsync_slurped_objects=
  69
  70 if test "" = "$append"
  71 then
  72         : >"$GIT_DIR/FETCH_HEAD"
  73 fi
  74
  75 append_fetch_head () {
  76     head_="$1"
  77     remote_="$2"
  78     remote_name_="$3"
  79     remote_nick_="$4"
  80     local_name_="$5"
  81     case "$6" in
  82     t) not_for_merge_='not-for-merge' ;;
  83     '') not_for_merge_= ;;
  84     esac
  85
  86     # remote-nick is the URL given on the command line (or a shorthand)
  87     # remote-name is the $GIT_DIR relative refs/ path we computed
  88     # for this refspec.
  89     case "$remote_name_" in
  90     HEAD)
  91         note_= ;;
  92     refs/heads/*)
  93         note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  94         note_="branch '$note_' of " ;;
  95     refs/tags/*)
  96         note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  97         note_="tag '$note_' of " ;;
  98     *)
  99         note_="$remote_name of " ;;
 100     esac
 101     remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
 102         remote_="$remote_1_"
 103     note_="$note_$remote_"
 104
 105     # 2.6.11-tree tag would not be happy to be fed to resolve.
 106     if git-cat-file commit "$head_" >/dev/null 2>&1
 107     then
 108         headc_=$(git-rev-parse --verify "$head_^0") || exit
 109         echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
 110         [ "$verbose" ] && echo >&2 "* committish: $head_"
 111         [ "$verbose" ] && echo >&2 "  $note_"
 112     else
 113         echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 114         [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 115         [ "$verbose" ] && echo >&2 "  $note_"
 116     fi
 117     if test "$local_name_" != ""
 118     then
 119         # We are storing the head locally.  Make sure that it is
 120         # a fast forward (aka "reverse push").
 121         fast_forward_local "$local_name_" "$head_" "$note_"
 122     fi
 123 }
 124
 125 fast_forward_local () {
 126     mkdir -p "$(dirname "$GIT_DIR/$1")"
 127     case "$1" in
 128     refs/tags/*)
 129         # Tags need not be pointing at commits so there
 130         # is no way to guarantee "fast-forward" anyway.
 131         if test -f "$GIT_DIR/$1"
 132         then
 133                 if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 134                 then
 135                         [ "$verbose" ] && echo >&2 "* $1: same as $3"
 136                 else
 137                         echo >&2 "* $1: updating with $3"
 138                 fi
 139         else
 140                 echo >&2 "* $1: storing $3"
 141         fi
 142         git-update-ref "$1" "$2"
 143         ;;
 144
 145     refs/heads/*)
 146         # $1 is the ref being updated.
 147         # $2 is the new value for the ref.
 148         local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 149         if test "$local"
 150         then
 151             # Require fast-forward.
 152             mb=$(git-merge-base "$local" "$2") &&
 153             case "$2,$mb" in
 154             $local,*)
 155                 echo >&2 "* $1: same as $3"
 156                 ;;
 157             *,$local)
 158                 echo >&2 "* $1: fast forward to $3"
 159                 git-update-ref "$1" "$2" "$local"
 160                 ;;
 161             *)
 162                 false
 163                 ;;
 164             esac || {
 165                 echo >&2 "* $1: does not fast forward to $3;"
 166                 case ",$force,$single_force," in
 167                 *,t,*)
 168                         echo >&2 "  forcing update."
 169                         git-update-ref "$1" "$2" "$local"
 170                         ;;
 171                 *)
 172                         echo >&2 "  not updating."
 173                         ;;
 174                 esac
 175             }
 176         else
 177             echo >&2 "* $1: storing $3"
 178             git-update-ref "$1" "$2"
 179         fi
 180         ;;
 181     esac
 182 }
 183
 184 case "$update_head_ok" in
 185 '')
 186         orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 187         ;;
 188 esac
 189
 190 # If --tags (and later --heads or --all) is specified, then we are
 191 # not talking about defaults stored in Pull: line of remotes or
 192 # branches file, and just fetch those and refspecs explicitly given.
 193 # Otherwise we do what we always did.
 194
 195 reflist=$(get_remote_refs_for_fetch "$@")
 196 if test "$tags"
 197 then
 198         taglist=$(IFS=" " &&
 199                   git-ls-remote --tags "$remote" |
 200                   while read sha1 name
 201                   do
 202                         case "$name" in
 203                         (*^*) continue ;;
 204                         esac
 205                         if git-check-ref-format "$name"
 206                         then
 207                             echo ".${name}:${name}"
 208                         else
 209                             echo >&2 "warning: tag ${name} ignored"
 210                         fi
 211                   done)
 212         if test "$#" -gt 1
 213         then
 214                 # remote URL plus explicit refspecs; we need to merge them.
 215                 reflist="$reflist$LF$taglist"
 216         else
 217                 # No explicit refspecs; fetch tags only.
 218                 reflist=$taglist
 219         fi
 220 fi
 221
 222 fetch_main () {
 223   reflist="$1"
 224   refs=
 225
 226   for ref in $reflist
 227   do
 228       refs="$refs$LF$ref"
 229
 230       # These are relative path from $GIT_DIR, typically starting at refs/
 231       # but may be HEAD
 232       if expr "$ref" : '\.' >/dev/null
 233       then
 234           not_for_merge=t
 235           ref=$(expr "$ref" : '\.\(.*\)')
 236       else
 237           not_for_merge=
 238       fi
 239       if expr "$ref" : '\+' >/dev/null
 240       then
 241           single_force=t
 242           ref=$(expr "$ref" : '\+\(.*\)')
 243       else
 244           single_force=
 245       fi
 246       remote_name=$(expr "$ref" : '\([^:]*\):')
 247       local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 248
 249       rref="$rref$LF$remote_name"
 250
 251       # There are transports that can fetch only one head at a time...
 252       case "$remote" in
 253       http://* | https://*)
 254           if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 255               curl_extra_args="-k"
 256           fi
 257           remote_name_quoted=$(perl -e '
 258               my $u = $ARGV[0];
 259               $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 260               print "$u";
 261           ' "$remote_name")
 262           head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 263           expr "$head" : "$_x40\$" >/dev/null ||
 264                   die "Failed to fetch $remote_name from $remote"
 265           echo >&2 Fetching "$remote_name from $remote" using http
 266           git-http-fetch -v -a "$head" "$remote/" || exit
 267           ;;
 268       rsync://*)
 269           TMP_HEAD="$GIT_DIR/TMP_HEAD"
 270           rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 271           head=$(git-rev-parse --verify TMP_HEAD)
 272           rm -f "$TMP_HEAD"
 273           test "$rsync_slurped_objects" || {
 274               rsync -av --ignore-existing --exclude info \
 275                   "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 276
 277               # Look at objects/info/alternates for rsync -- http will
 278               # support it natively and git native ones will do it on
 279               # the remote end.  Not having that file is not a crime.
 280               rsync -q "$remote/objects/info/alternates" \
 281                   "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 282                   rm -f "$GIT_DIR/TMP_ALT"
 283               if test -f "$GIT_DIR/TMP_ALT"
 284               then
 285                   resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 286                   while read alt
 287                   do
 288                       case "$alt" in 'bad alternate: '*) die "$alt";; esac
 289                       echo >&2 "Getting alternate: $alt"
 290                       rsync -av --ignore-existing --exclude info \
 291                       "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 292                   done
 293                   rm -f "$GIT_DIR/TMP_ALT"
 294               fi
 295               rsync_slurped_objects=t
 296           }
 297           ;;
 298       *)
 299           # We will do git native transport with just one call later.
 300           continue ;;
 301       esac
 302
 303       append_fetch_head "$head" "$remote" \
 304           "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 305
 306   done
 307
 308   case "$remote" in
 309   http://* | https://* | rsync://* )
 310       ;; # we are already done.
 311   *)
 312     ( : subshell because we muck with IFS
 313       IFS="     $LF"
 314       (
 315           git-fetch-pack $keep "$remote" $rref || echo failed "$remote"
 316       ) |
 317       while read sha1 remote_name
 318       do
 319           case "$sha1" in
 320           failed)
 321                   echo >&2 "Fetch failure: $remote"
 322                   exit 1 ;;
 323           esac
 324           found=
 325           single_force=
 326           for ref in $refs
 327           do
 328               case "$ref" in
 329               +$remote_name:*)
 330                   single_force=t
 331                   not_for_merge=
 332                   found="$ref"
 333                   break ;;
 334               .+$remote_name:*)
 335                   single_force=t
 336                   not_for_merge=t
 337                   found="$ref"
 338                   break ;;
 339               .$remote_name:*)
 340                   not_for_merge=t
 341                   found="$ref"
 342                   break ;;
 343               $remote_name:*)
 344                   not_for_merge=
 345                   found="$ref"
 346                   break ;;
 347               esac
 348           done
 349           local_name=$(expr "$found" : '[^:]*:\(.*\)')
 350           append_fetch_head "$sha1" "$remote" \
 351                   "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 352       done
 353     ) || exit ;;
 354   esac
 355
 356 }
 357
 358 fetch_main "$reflist"
 359
 360 # automated tag following
 361 case "$no_tags$tags" in
 362 '')
 363         taglist=$(IFS=" " &&
 364         git-ls-remote --tags "$remote" |
 365         sed -ne 's|^\([0-9a-f]*\)[      ]\(refs/tags/.*\)^{}$|\1 \2|p' |
 366         while read sha1 name
 367         do
 368                 test -f "$GIT_DIR/$name" && continue
 369                 git-check-ref-format "$name" || {
 370                         echo >&2 "warning: tag ${name} ignored"
 371                         continue
 372                 }
 373                 git-cat-file -t "$sha1" >/dev/null 2>&1 || continue
 374                 echo >&2 "Auto-following $name"
 375                 echo ".${name}:${name}"
 376         done)
 377         case "$taglist" in
 378         '') ;;
 379         ?*)
 380                 fetch_main "$taglist" ;;
 381         esac
 382 esac
 383
 384 # If the original head was empty (i.e. no "master" yet), or
 385 # if we were told not to worry, we do not have to check.
 386 case ",$update_head_ok,$orig_head," in
 387 *,, | t,* )
 388         ;;
 389 *)
 390         curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 391         if test "$curr_head" != "$orig_head"
 392         then
 393                 git-update-ref HEAD "$orig_head"
 394                 die "Cannot fetch into the current branch."
 395         fi
 396         ;;
 397 esac