Andrew's git / gitweb.git / git-fetch.sh
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git-fetch.shon commit Merge http://www.kernel.org/pub/scm/gitk/gitk (302ebfe)
   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
   8LF='
   9'
  10IFS="$LF"
  11
  12tags=
  13append=
  14force=
  15verbose=
  16update_head_ok=
  17while case "$#" in 0) break ;; esac
  18do
  19        case "$1" in
  20        -a|--a|--ap|--app|--appe|--appen|--append)
  21                append=t
  22                ;;
  23        -f|--f|--fo|--for|--forc|--force)
  24                force=t
  25                ;;
  26        -t|--t|--ta|--tag|--tags)
  27                tags=t
  28                ;;
  29        -u|--u|--up|--upd|--upda|--updat|--update|--update-|--update-h|\
  30        --update-he|--update-hea|--update-head|--update-head-|\
  31        --update-head-o|--update-head-ok)
  32                update_head_ok=t
  33                ;;
  34        -v|--verbose)
  35                verbose=Yes
  36                ;;
  37        *)
  38                break
  39                ;;
  40        esac
  41        shift
  42done
  43
  44case "$#" in
  450)
  46        test -f "$GIT_DIR/branches/origin" ||
  47                test -f "$GIT_DIR/remotes/origin" ||
  48                        die "Where do you want to fetch from today?"
  49        set origin ;;
  50esac
  51
  52remote_nick="$1"
  53remote=$(get_remote_url "$@")
  54refs=
  55rref=
  56rsync_slurped_objects=
  57
  58if test "" = "$append"
  59then
  60        : >"$GIT_DIR/FETCH_HEAD"
  61fi
  62
  63append_fetch_head () {
  64    head_="$1"
  65    remote_="$2"
  66    remote_name_="$3"
  67    remote_nick_="$4"
  68    local_name_="$5"
  69    case "$6" in
  70    t) not_for_merge_='not-for-merge' ;;
  71    '') not_for_merge_= ;;
  72    esac
  73
  74    # remote-nick is the URL given on the command line (or a shorthand)
  75    # remote-name is the $GIT_DIR relative refs/ path we computed
  76    # for this refspec.
  77    case "$remote_name_" in
  78    HEAD)
  79        note_= ;;
  80    refs/heads/*)
  81        note_="$(expr "$remote_name_" : 'refs/heads/\(.*\)')"
  82        note_="branch '$note_' of " ;;
  83    refs/tags/*)
  84        note_="$(expr "$remote_name_" : 'refs/tags/\(.*\)')"
  85        note_="tag '$note_' of " ;;
  86    *)
  87        note_="$remote_name of " ;;
  88    esac
  89    remote_1_=$(expr "$remote_" : '\(.*\)\.git/*$') &&
  90        remote_="$remote_1_"
  91    note_="$note_$remote_"
  92
  93    # 2.6.11-tree tag would not be happy to be fed to resolve.
  94    if git-cat-file commit "$head_" >/dev/null 2>&1
  95    then
  96        headc_=$(git-rev-parse --verify "$head_^0") || exit
  97        echo "$headc_   $not_for_merge_ $note_" >>"$GIT_DIR/FETCH_HEAD"
  98        [ "$verbose" ] && echo >&2 "* committish: $head_"
  99        [ "$verbose" ] && echo >&2 "  $note_"
 100    else
 101        echo "$head_    not-for-merge   $note_" >>"$GIT_DIR/FETCH_HEAD"
 102        [ "$verbose" ] && echo >&2 "* non-commit: $head_"
 103        [ "$verbose" ] && echo >&2 "  $note_"
 104    fi
 105    if test "$local_name_" != ""
 106    then
 107        # We are storing the head locally.  Make sure that it is
 108        # a fast forward (aka "reverse push").
 109        fast_forward_local "$local_name_" "$head_" "$note_"
 110    fi
 111}
 112
 113fast_forward_local () {
 114    mkdir -p "$(dirname "$GIT_DIR/$1")"
 115    case "$1" in
 116    refs/tags/*)
 117        # Tags need not be pointing at commits so there
 118        # is no way to guarantee "fast-forward" anyway.
 119        if test -f "$GIT_DIR/$1"
 120        then
 121                if now_=$(cat "$GIT_DIR/$1") && test "$now_" = "$2"
 122                then
 123                        [ "$verbose" ] && echo >&2 "* $1: same as $3"
 124                else
 125                        echo >&2 "* $1: updating with $3"
 126                fi
 127        else
 128                echo >&2 "* $1: storing $3"
 129        fi
 130        git-update-ref "$1" "$2" 
 131        ;;
 132
 133    refs/heads/*)
 134        # $1 is the ref being updated.
 135        # $2 is the new value for the ref.
 136        local=$(git-rev-parse --verify "$1^0" 2>/dev/null)
 137        if test "$local"
 138        then
 139            # Require fast-forward.
 140            mb=$(git-merge-base "$local" "$2") &&
 141            case "$2,$mb" in
 142            $local,*)
 143                echo >&2 "* $1: same as $3"
 144                ;;
 145            *,$local)
 146                echo >&2 "* $1: fast forward to $3"
 147                git-update-ref "$1" "$2" "$local"
 148                ;;
 149            *)
 150                false
 151                ;;
 152            esac || {
 153                echo >&2 "* $1: does not fast forward to $3;"
 154                case ",$force,$single_force," in
 155                *,t,*)
 156                        echo >&2 "  forcing update."
 157                        git-update-ref "$1" "$2" "$local"
 158                        ;;
 159                *)
 160                        echo >&2 "  not updating."
 161                        ;;
 162                esac
 163            }
 164        else
 165            echo >&2 "* $1: storing $3"
 166            git-update-ref "$1" "$2"
 167        fi
 168        ;;
 169    esac
 170}
 171
 172case "$update_head_ok" in
 173'')
 174        orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 175        ;;
 176esac
 177
 178# If --tags (and later --heads or --all) is specified, then we are
 179# not talking about defaults stored in Pull: line of remotes or
 180# branches file, and just fetch those and refspecs explicitly given.
 181# Otherwise we do what we always did.
 182
 183reflist=$(get_remote_refs_for_fetch "$@")
 184if test "$tags"
 185then
 186        taglist=$(git-ls-remote --tags "$remote" |
 187                sed -e '
 188                        /\^/d
 189                        s/^[^   ]*      //
 190                        s/.*/&:&/')
 191        if test "$#" -gt 1
 192        then
 193                # remote URL plus explicit refspecs; we need to merge them.
 194                reflist="$reflist$LF$taglist"
 195        else
 196                # No explicit refspecs; fetch tags only.
 197                reflist=$taglist
 198        fi
 199fi
 200
 201for ref in $reflist
 202do
 203    refs="$refs$LF$ref"
 204
 205    # These are relative path from $GIT_DIR, typically starting at refs/
 206    # but may be HEAD
 207    if expr "$ref" : '\.' >/dev/null
 208    then
 209        not_for_merge=t
 210        ref=$(expr "$ref" : '\.\(.*\)')
 211    else
 212        not_for_merge=
 213    fi
 214    if expr "$ref" : '\+' >/dev/null
 215    then
 216        single_force=t
 217        ref=$(expr "$ref" : '\+\(.*\)')
 218    else
 219        single_force=
 220    fi
 221    remote_name=$(expr "$ref" : '\([^:]*\):')
 222    local_name=$(expr "$ref" : '[^:]*:\(.*\)')
 223
 224    rref="$rref$LF$remote_name"
 225
 226    # There are transports that can fetch only one head at a time...
 227    case "$remote" in
 228    http://* | https://*)
 229        if [ -n "$GIT_SSL_NO_VERIFY" ]; then
 230            curl_extra_args="-k"
 231        fi
 232        remote_name_quoted=$(perl -e '
 233            my $u = $ARGV[0];
 234            $u =~ s{([^-a-zA-Z0-9/.])}{sprintf"%%%02x",ord($1)}eg;
 235            print "$u";
 236        ' "$remote_name")
 237        head=$(curl -nsfL $curl_extra_args "$remote/$remote_name_quoted") &&
 238        expr "$head" : "$_x40\$" >/dev/null ||
 239                die "Failed to fetch $remote_name from $remote"
 240        echo >&2 Fetching "$remote_name from $remote" using http
 241        git-http-fetch -v -a "$head" "$remote/" || exit
 242        ;;
 243    rsync://*)
 244        TMP_HEAD="$GIT_DIR/TMP_HEAD"
 245        rsync -L -q "$remote/$remote_name" "$TMP_HEAD" || exit 1
 246        head=$(git-rev-parse --verify TMP_HEAD)
 247        rm -f "$TMP_HEAD"
 248        test "$rsync_slurped_objects" || {
 249            rsync -av --ignore-existing --exclude info \
 250                "$remote/objects/" "$GIT_OBJECT_DIRECTORY/" || exit
 251
 252            # Look at objects/info/alternates for rsync -- http will
 253            # support it natively and git native ones will do it on the remote
 254            # end.  Not having that file is not a crime.
 255            rsync -q "$remote/objects/info/alternates" \
 256                "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 257                rm -f "$GIT_DIR/TMP_ALT"
 258            if test -f "$GIT_DIR/TMP_ALT"
 259            then
 260                resolve_alternates "$remote" <"$GIT_DIR/TMP_ALT" |
 261                while read alt
 262                do
 263                    case "$alt" in 'bad alternate: '*) die "$alt";; esac
 264                    echo >&2 "Getting alternate: $alt"
 265                    rsync -av --ignore-existing --exclude info \
 266                    "$alt" "$GIT_OBJECT_DIRECTORY/" || exit
 267                done
 268                rm -f "$GIT_DIR/TMP_ALT"
 269            fi
 270            rsync_slurped_objects=t
 271        }
 272        ;;
 273    *)
 274        # We will do git native transport with just one call later.
 275        continue ;;
 276    esac
 277
 278    append_fetch_head "$head" "$remote" \
 279        "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 280
 281done
 282
 283case "$remote" in
 284http://* | https://* | rsync://* )
 285    ;; # we are already done.
 286*)
 287    IFS="       $LF"
 288    (
 289        git-fetch-pack "$remote" $rref || echo failed "$remote"
 290    ) |
 291    while read sha1 remote_name
 292    do
 293        case "$sha1" in
 294        failed)
 295                echo >&2 "Fetch failure: $remote"
 296                exit 1 ;;
 297        esac
 298        found=
 299        single_force=
 300        for ref in $refs
 301        do
 302            case "$ref" in
 303            +$remote_name:*)
 304                single_force=t
 305                not_for_merge=
 306                found="$ref"
 307                break ;;
 308            .+$remote_name:*)
 309                single_force=t
 310                not_for_merge=t
 311                found="$ref"
 312                break ;;
 313            .$remote_name:*)
 314                not_for_merge=t
 315                found="$ref"
 316                break ;;
 317            $remote_name:*)
 318                not_for_merge=
 319                found="$ref"
 320                break ;;
 321            esac
 322        done
 323        local_name=$(expr "$found" : '[^:]*:\(.*\)')
 324        append_fetch_head "$sha1" "$remote" \
 325                "$remote_name" "$remote_nick" "$local_name" "$not_for_merge"
 326    done || exit
 327    ;;
 328esac
 329
 330# If the original head was empty (i.e. no "master" yet), or
 331# if we were told not to worry, we do not have to check.
 332case ",$update_head_ok,$orig_head," in
 333*,, | t,* )
 334        ;;
 335*)
 336        curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
 337        if test "$curr_head" != "$orig_head"
 338        then
 339                git-update-ref HEAD "$orig_head"
 340                die "Cannot fetch into the current branch."
 341        fi
 342        ;;
 343esac