git-clone.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005, Linus Torvalds
   4 # Copyright (c) 2005, Junio C Hamano
   5 #
   6 # Clone a repository into a different directory that does not yet exist.
   7
   8 # See git-sh-setup why.
   9 unset CDPATH
  10
  11 usage() {
  12         echo >&2 "Usage: $0 [--reference <reference-repo>] [--bare] [-l [-s]] [-q] [-u <upload-pack>] [-o <name>] [-n] <repo> [<dir>]"
  13         exit 1
  14 }
  15
  16 get_repo_base() {
  17         (cd "$1" && (cd .git ; pwd)) 2> /dev/null
  18 }
  19
  20 if [ -n "$GIT_SSL_NO_VERIFY" ]; then
  21     curl_extra_args="-k"
  22 fi
  23
  24 http_fetch () {
  25         # $1 = Remote, $2 = Local
  26         curl -nsfL $curl_extra_args "$1" >"$2"
  27 }
  28
  29 clone_dumb_http () {
  30         # $1 - remote, $2 - local
  31         cd "$2" &&
  32         clone_tmp='.git/clone-tmp' &&
  33         mkdir -p "$clone_tmp" || exit 1
  34         http_fetch "$1/info/refs" "$clone_tmp/refs" || {
  35                 echo >&2 "Cannot get remote repository information.
  36 Perhaps git-update-server-info needs to be run there?"
  37                 exit 1;
  38         }
  39         while read sha1 refname
  40         do
  41                 name=`expr "$refname" : 'refs/\(.*\)'` &&
  42                 case "$name" in
  43                 *^*)    continue;;
  44                 esac
  45                 if test -n "$use_separate_remote" &&
  46                    branch_name=`expr "$name" : 'heads/\(.*\)'`
  47                 then
  48                         tname="remotes/$branch_name"
  49                 else
  50                         tname=$name
  51                 fi
  52                 git-http-fetch -v -a -w "$tname" "$name" "$1/" || exit 1
  53         done <"$clone_tmp/refs"
  54         rm -fr "$clone_tmp"
  55         http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD"
  56 }
  57
  58 # Read git-fetch-pack -k output and store the remote branches.
  59 copy_refs='
  60 use File::Path qw(mkpath);
  61 use File::Basename qw(dirname);
  62 my $git_dir = $ARGV[0];
  63 my $use_separate_remote = $ARGV[1];
  64
  65 my $branch_top = ($use_separate_remote ? "remotes" : "heads");
  66 my $tag_top = "tags";
  67
  68 sub store {
  69         my ($sha1, $name, $top) = @_;
  70         $name = "$git_dir/refs/$top/$name";
  71         mkpath(dirname($name));
  72         open O, ">", "$name";
  73         print O "$sha1\n";
  74         close O;
  75 }
  76
  77 open FH, "<", "$git_dir/CLONE_HEAD";
  78 while (<FH>) {
  79         my ($sha1, $name) = /^([0-9a-f]{40})\s(.*)$/;
  80         next if ($name =~ /\^\173/);
  81         if ($name eq "HEAD") {
  82                 open O, ">", "$git_dir/REMOTE_HEAD";
  83                 print O "$sha1\n";
  84                 close O;
  85                 next;
  86         }
  87         if ($name =~ s/^refs\/heads\///) {
  88                 store($sha1, $name, $branch_top);
  89                 next;
  90         }
  91         if ($name =~ s/^refs\/tags\///) {
  92                 store($sha1, $name, $tag_top);
  93                 next;
  94         }
  95 }
  96 close FH;
  97 '
  98
  99 quiet=
 100 use_local=no
 101 local_shared=no
 102 no_checkout=
 103 upload_pack=
 104 bare=
 105 reference=
 106 origin=
 107 origin_override=
 108 use_separate_remote=
 109 while
 110         case "$#,$1" in
 111         0,*) break ;;
 112         *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
 113         *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
 114           no_checkout=yes ;;
 115         *,--na|*,--nak|*,--nake|*,--naked|\
 116         *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
 117         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
 118         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
 119           local_shared=yes; use_local=yes ;;
 120         *,-q|*,--quiet) quiet=-q ;;
 121         *,--use-separate-remote)
 122                 use_separate_remote=t ;;
 123         1,-o) usage;;
 124         1,--reference) usage ;;
 125         *,--reference)
 126                 shift; reference="$1" ;;
 127         *,--reference=*)
 128                 reference=`expr "$1" : '--reference=\(.*\)'` ;;
 129         *,-o)
 130                 git-check-ref-format "$2" || {
 131                     echo >&2 "'$2' is not suitable for a branch name"
 132                     exit 1
 133                 }
 134                 test -z "$origin_override" || {
 135                     echo >&2 "Do not give more than one -o options."
 136                     exit 1
 137                 }
 138                 origin_override=yes
 139                 origin="$2"; shift
 140                 ;;
 141         1,-u|1,--upload-pack) usage ;;
 142         *,-u|*,--upload-pack)
 143                 shift
 144                 upload_pack="--exec=$1" ;;
 145         *,-*) usage ;;
 146         *) break ;;
 147         esac
 148 do
 149         shift
 150 done
 151
 152 # --bare implies --no-checkout
 153 if test yes = "$bare"
 154 then
 155         if test yes = "$origin_override"
 156         then
 157                 echo >&2 '--bare and -o $origin options are incompatible.'
 158                 exit 1
 159         fi
 160         if test t = "$use_separate_remote"
 161         then
 162                 echo >&2 '--bare and --use-separate-remote options are incompatible.'
 163                 exit 1
 164         fi
 165         no_checkout=yes
 166 fi
 167
 168 if test -z "$origin_override$origin"
 169 then
 170         if test -n "$use_separate_remote"
 171         then
 172                 origin=remotes/master
 173         else
 174                 origin=heads/origin
 175         fi
 176 fi
 177
 178 # Turn the source into an absolute path if
 179 # it is local
 180 repo="$1"
 181 local=no
 182 if base=$(get_repo_base "$repo"); then
 183         repo="$base"
 184         local=yes
 185 fi
 186
 187 dir="$2"
 188 # Try using "humanish" part of source repo if user didn't specify one
 189 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 190 [ -e "$dir" ] && echo "$dir already exists." && usage
 191 mkdir -p "$dir" &&
 192 D=$(cd "$dir" && pwd) &&
 193 trap 'err=$?; cd ..; rm -r "$D"; exit $err' exit
 194 case "$bare" in
 195 yes) GIT_DIR="$D" ;;
 196 *) GIT_DIR="$D/.git" ;;
 197 esac && export GIT_DIR && git-init-db || usage
 198 case "$bare" in
 199 yes)
 200         GIT_DIR="$D" ;;
 201 *)
 202         GIT_DIR="$D/.git" ;;
 203 esac
 204
 205 if test -n "$reference"
 206 then
 207         if test -d "$reference"
 208         then
 209                 if test -d "$reference/.git/objects"
 210                 then
 211                         reference="$reference/.git"
 212                 fi
 213                 reference=$(cd "$reference" && pwd)
 214                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 215                 (cd "$reference" && tar cf - refs) |
 216                 (cd "$GIT_DIR/refs" &&
 217                  mkdir reference-tmp &&
 218                  cd reference-tmp &&
 219                  tar xf -)
 220         else
 221                 echo >&2 "$reference: not a local directory." && usage
 222         fi
 223 fi
 224
 225 rm -f "$GIT_DIR/CLONE_HEAD"
 226
 227 # We do local magic only when the user tells us to.
 228 case "$local,$use_local" in
 229 yes,yes)
 230         ( cd "$repo/objects" ) || {
 231                 echo >&2 "-l flag seen but $repo is not local."
 232                 exit 1
 233         }
 234
 235         case "$local_shared" in
 236         no)
 237             # See if we can hardlink and drop "l" if not.
 238             sample_file=$(cd "$repo" && \
 239                           find objects -type f -print | sed -e 1q)
 240
 241             # objects directory should not be empty since we are cloning!
 242             test -f "$repo/$sample_file" || exit
 243
 244             l=
 245             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 246             then
 247                     l=l
 248             fi &&
 249             rm -f "$GIT_DIR/objects/sample" &&
 250             cd "$repo" &&
 251             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 252             ;;
 253         yes)
 254             mkdir -p "$GIT_DIR/objects/info"
 255             {
 256                 test -f "$repo/objects/info/alternates" &&
 257                 cat "$repo/objects/info/alternates";
 258                 echo "$repo/objects"
 259             } >"$GIT_DIR/objects/info/alternates"
 260             ;;
 261         esac
 262         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 263         ;;
 264 *)
 265         case "$repo" in
 266         rsync://*)
 267                 rsync $quiet -av --ignore-existing  \
 268                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 269                 exit
 270                 # Look at objects/info/alternates for rsync -- http will
 271                 # support it natively and git native ones will do it on the
 272                 # remote end.  Not having that file is not a crime.
 273                 rsync -q "$repo/objects/info/alternates" \
 274                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 275                         rm -f "$GIT_DIR/TMP_ALT"
 276                 if test -f "$GIT_DIR/TMP_ALT"
 277                 then
 278                     ( cd "$D" &&
 279                       . git-parse-remote &&
 280                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 281                     while read alt
 282                     do
 283                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 284                         case "$quiet" in
 285                         '')     echo >&2 "Getting alternate: $alt" ;;
 286                         esac
 287                         rsync $quiet -av --ignore-existing  \
 288                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 289                     done
 290                     rm -f "$GIT_DIR/TMP_ALT"
 291                 fi
 292                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 293                 ;;
 294         http://*)
 295                 if test -z "@@NO_CURL@@"
 296                 then
 297                         clone_dumb_http "$repo" "$D"
 298                 else
 299                         echo >&2 "http transport not supported, rebuild Git with curl support"
 300                         exit 1
 301                 fi
 302                 ;;
 303         *)
 304                 cd "$D" && case "$upload_pack" in
 305                 '') git-fetch-pack --all -k $quiet "$repo" ;;
 306                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 307                 esac >"$GIT_DIR/CLONE_HEAD" || {
 308                         echo >&2 "fetch-pack from '$repo' failed."
 309                         exit 1
 310                 }
 311                 ;;
 312         esac
 313         ;;
 314 esac
 315 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 316
 317 if test -f "$GIT_DIR/CLONE_HEAD"
 318 then
 319         # Figure out where the remote HEAD points at.
 320         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote"
 321 fi
 322
 323 cd "$D" || exit
 324
 325 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 326 then
 327         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 328         # Figure out which remote branch HEAD points at.
 329         case "$use_separate_remote" in
 330         '')     remote_top=refs/heads ;;
 331         *)      remote_top=refs/remotes ;;
 332         esac
 333         head_points_at=$(
 334                 (
 335                         echo "master"
 336                         cd "$GIT_DIR/$remote_top" &&
 337                         find . -type f -print | sed -e 's/^\.\///'
 338                 ) | (
 339                 done=f
 340                 while read name
 341                 do
 342                         test t = $done && continue
 343                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 344                         if test "$head_sha1" = "$branch_tip"
 345                         then
 346                                 echo "$name"
 347                                 done=t
 348                         fi
 349                 done
 350                 )
 351         )
 352         case "$head_points_at" in
 353         ?*)
 354                 mkdir -p "$GIT_DIR/remotes" &&
 355                 echo >"$GIT_DIR/remotes/origin" \
 356                 "URL: $repo
 357 Pull: refs/heads/$head_points_at:refs/$origin" &&
 358                 case "$use_separate_remote" in
 359                 t) git-update-ref HEAD "$head_sha1" ;;
 360                 *) git-update-ref "refs/$origin" $(git-rev-parse HEAD)
 361                 esac &&
 362                 (cd "$GIT_DIR" && find "$remote_top" -type f -print) |
 363                 while read ref
 364                 do
 365                         head=`expr "$ref" : 'refs/\(.*\)'` &&
 366                         name=`expr "$ref" : 'refs/[^\/]*/\(.*\)'` &&
 367                         test "$head_points_at" = "$name" ||
 368                         test "$origin" = "$head" ||
 369                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
 370                 done >>"$GIT_DIR/remotes/origin"
 371         esac
 372
 373         case "$no_checkout" in
 374         '')
 375                 git-read-tree -m -u -v HEAD HEAD
 376         esac
 377 fi
 378 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 379
 380 trap - exit
 381