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 [--use-separate-remote] [--reference <reference-repo>] [--bare] [-l [-s]] [-q] [-u <upload-pack>] [--origin <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/$origin/$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 my $origin = $ARGV[2];
  65
  66 my $branch_top = ($use_separate_remote ? "remotes/$origin" : "heads");
  67 my $tag_top = "tags";
  68
  69 sub store {
  70         my ($sha1, $name, $top) = @_;
  71         $name = "$git_dir/refs/$top/$name";
  72         mkpath(dirname($name));
  73         open O, ">", "$name";
  74         print O "$sha1\n";
  75         close O;
  76 }
  77
  78 open FH, "<", "$git_dir/CLONE_HEAD";
  79 while (<FH>) {
  80         my ($sha1, $name) = /^([0-9a-f]{40})\s(.*)$/;
  81         next if ($name =~ /\^\173/);
  82         if ($name eq "HEAD") {
  83                 open O, ">", "$git_dir/REMOTE_HEAD";
  84                 print O "$sha1\n";
  85                 close O;
  86                 next;
  87         }
  88         if ($name =~ s/^refs\/heads\///) {
  89                 store($sha1, $name, $branch_top);
  90                 next;
  91         }
  92         if ($name =~ s/^refs\/tags\///) {
  93                 store($sha1, $name, $tag_top);
  94                 next;
  95         }
  96 }
  97 close FH;
  98 '
  99
 100 quiet=
 101 local=no
 102 use_local=no
 103 local_shared=no
 104 no_checkout=
 105 upload_pack=
 106 bare=
 107 reference=
 108 origin=
 109 origin_override=
 110 use_separate_remote=
 111 while
 112         case "$#,$1" in
 113         0,*) break ;;
 114         *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
 115         *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
 116           no_checkout=yes ;;
 117         *,--na|*,--nak|*,--nake|*,--naked|\
 118         *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
 119         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
 120         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
 121           local_shared=yes; use_local=yes ;;
 122         *,-q|*,--quiet) quiet=-q ;;
 123         *,--use-separate-remote)
 124                 use_separate_remote=t ;;
 125         1,--reference) usage ;;
 126         *,--reference)
 127                 shift; reference="$1" ;;
 128         *,--reference=*)
 129                 reference=`expr "$1" : '--reference=\(.*\)'` ;;
 130         *,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
 131                 case "$2" in
 132                 '')
 133                     usage ;;
 134                 */*)
 135                     echo >&2 "'$2' is not suitable for an origin name"
 136                     exit 1
 137                 esac
 138                 git-check-ref-format "heads/$2" || {
 139                     echo >&2 "'$2' is not suitable for a branch name"
 140                     exit 1
 141                 }
 142                 test -z "$origin_override" || {
 143                     echo >&2 "Do not give more than one --origin options."
 144                     exit 1
 145                 }
 146                 origin_override=yes
 147                 origin="$2"; shift
 148                 ;;
 149         1,-u|1,--upload-pack) usage ;;
 150         *,-u|*,--upload-pack)
 151                 shift
 152                 upload_pack="--exec=$1" ;;
 153         *,-*) usage ;;
 154         *) break ;;
 155         esac
 156 do
 157         shift
 158 done
 159
 160 repo="$1"
 161 if test -z "$repo"
 162 then
 163     echo >&2 'you must specify a repository to clone.'
 164     exit 1
 165 fi
 166
 167 # --bare implies --no-checkout
 168 if test yes = "$bare"
 169 then
 170         if test yes = "$origin_override"
 171         then
 172                 echo >&2 '--bare and --origin $origin options are incompatible.'
 173                 exit 1
 174         fi
 175         if test t = "$use_separate_remote"
 176         then
 177                 echo >&2 '--bare and --use-separate-remote options are incompatible.'
 178                 exit 1
 179         fi
 180         no_checkout=yes
 181 fi
 182
 183 if test -z "$origin"
 184 then
 185         origin=origin
 186 fi
 187
 188 # Turn the source into an absolute path if
 189 # it is local
 190 if base=$(get_repo_base "$repo"); then
 191         repo="$base"
 192         local=yes
 193 fi
 194
 195 dir="$2"
 196 # Try using "humanish" part of source repo if user didn't specify one
 197 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 198 [ -e "$dir" ] && echo "$dir already exists." && usage
 199 mkdir -p "$dir" &&
 200 D=$(cd "$dir" && pwd) &&
 201 trap 'err=$?; cd ..; rm -r "$D"; exit $err' exit
 202 case "$bare" in
 203 yes) GIT_DIR="$D" ;;
 204 *) GIT_DIR="$D/.git" ;;
 205 esac && export GIT_DIR && git-init-db || usage
 206 case "$bare" in
 207 yes)
 208         GIT_DIR="$D" ;;
 209 *)
 210         GIT_DIR="$D/.git" ;;
 211 esac
 212
 213 if test -n "$reference"
 214 then
 215         if test -d "$reference"
 216         then
 217                 if test -d "$reference/.git/objects"
 218                 then
 219                         reference="$reference/.git"
 220                 fi
 221                 reference=$(cd "$reference" && pwd)
 222                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 223                 (cd "$reference" && tar cf - refs) |
 224                 (cd "$GIT_DIR/refs" &&
 225                  mkdir reference-tmp &&
 226                  cd reference-tmp &&
 227                  tar xf -)
 228         else
 229                 echo >&2 "$reference: not a local directory." && usage
 230         fi
 231 fi
 232
 233 rm -f "$GIT_DIR/CLONE_HEAD"
 234
 235 # We do local magic only when the user tells us to.
 236 case "$local,$use_local" in
 237 yes,yes)
 238         ( cd "$repo/objects" ) || {
 239                 echo >&2 "-l flag seen but $repo is not local."
 240                 exit 1
 241         }
 242
 243         case "$local_shared" in
 244         no)
 245             # See if we can hardlink and drop "l" if not.
 246             sample_file=$(cd "$repo" && \
 247                           find objects -type f -print | sed -e 1q)
 248
 249             # objects directory should not be empty since we are cloning!
 250             test -f "$repo/$sample_file" || exit
 251
 252             l=
 253             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 254             then
 255                     l=l
 256             fi &&
 257             rm -f "$GIT_DIR/objects/sample" &&
 258             cd "$repo" &&
 259             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 260             ;;
 261         yes)
 262             mkdir -p "$GIT_DIR/objects/info"
 263             {
 264                 test -f "$repo/objects/info/alternates" &&
 265                 cat "$repo/objects/info/alternates";
 266                 echo "$repo/objects"
 267             } >"$GIT_DIR/objects/info/alternates"
 268             ;;
 269         esac
 270         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 271         ;;
 272 *)
 273         case "$repo" in
 274         rsync://*)
 275                 rsync $quiet -av --ignore-existing  \
 276                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 277                 exit
 278                 # Look at objects/info/alternates for rsync -- http will
 279                 # support it natively and git native ones will do it on the
 280                 # remote end.  Not having that file is not a crime.
 281                 rsync -q "$repo/objects/info/alternates" \
 282                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 283                         rm -f "$GIT_DIR/TMP_ALT"
 284                 if test -f "$GIT_DIR/TMP_ALT"
 285                 then
 286                     ( cd "$D" &&
 287                       . git-parse-remote &&
 288                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 289                     while read alt
 290                     do
 291                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 292                         case "$quiet" in
 293                         '')     echo >&2 "Getting alternate: $alt" ;;
 294                         esac
 295                         rsync $quiet -av --ignore-existing  \
 296                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 297                     done
 298                     rm -f "$GIT_DIR/TMP_ALT"
 299                 fi
 300                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 301                 ;;
 302         http://*)
 303                 if test -z "@@NO_CURL@@"
 304                 then
 305                         clone_dumb_http "$repo" "$D"
 306                 else
 307                         echo >&2 "http transport not supported, rebuild Git with curl support"
 308                         exit 1
 309                 fi
 310                 ;;
 311         *)
 312                 cd "$D" && case "$upload_pack" in
 313                 '') git-fetch-pack --all -k $quiet "$repo" ;;
 314                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 315                 esac >"$GIT_DIR/CLONE_HEAD" || {
 316                         echo >&2 "fetch-pack from '$repo' failed."
 317                         exit 1
 318                 }
 319                 ;;
 320         esac
 321         ;;
 322 esac
 323 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 324
 325 if test -f "$GIT_DIR/CLONE_HEAD"
 326 then
 327         # Figure out where the remote HEAD points at.
 328         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
 329 fi
 330
 331 cd "$D" || exit
 332
 333 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 334 then
 335         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 336         # Figure out which remote branch HEAD points at.
 337         case "$use_separate_remote" in
 338         '')     remote_top=refs/heads ;;
 339         *)      remote_top="refs/remotes/$origin" ;;
 340         esac
 341
 342         # What to use to track the remote primary branch
 343         if test -n "$use_separate_remote"
 344         then
 345                 origin_tracking="remotes/$origin/master"
 346         else
 347                 origin_tracking="heads/$origin"
 348         fi
 349
 350         # The name under $remote_top the remote HEAD seems to point at
 351         head_points_at=$(
 352                 (
 353                         echo "master"
 354                         cd "$GIT_DIR/$remote_top" &&
 355                         find . -type f -print | sed -e 's/^\.\///'
 356                 ) | (
 357                 done=f
 358                 while read name
 359                 do
 360                         test t = $done && continue
 361                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 362                         if test "$head_sha1" = "$branch_tip"
 363                         then
 364                                 echo "$name"
 365                                 done=t
 366                         fi
 367                 done
 368                 )
 369         )
 370
 371         # Write out remotes/$origin file.
 372         case "$head_points_at" in
 373         ?*)
 374                 mkdir -p "$GIT_DIR/remotes" &&
 375                 echo >"$GIT_DIR/remotes/$origin" \
 376                 "URL: $repo
 377 Pull: refs/heads/$head_points_at:refs/$origin_tracking" &&
 378                 case "$use_separate_remote" in
 379                 t) git-update-ref HEAD "$head_sha1" ;;
 380                 *) git-update-ref "refs/heads/$origin" $(git-rev-parse HEAD) ;;
 381                 esac &&
 382                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
 383                 while read dotslref
 384                 do
 385                         name=`expr "$dotslref" : './\(.*\)'` &&
 386                         test "$head_points_at" = "$name" ||
 387                         test "$origin" = "$name" ||
 388                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
 389                 done >>"$GIT_DIR/remotes/$origin" &&
 390                 case "$use_separate_remote" in
 391                 t)
 392                         rm -f "refs/remotes/$origin/HEAD"
 393                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
 394                                 "refs/remotes/$origin/$head_points_at"
 395                 esac
 396         esac
 397
 398         case "$no_checkout" in
 399         '')
 400                 git-read-tree -m -u -v HEAD HEAD
 401         esac
 402 fi
 403 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 404
 405 trap - exit
 406