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