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 "z$refname" : 'zrefs/\(.*\)'` &&
  42                 case "$name" in
  43                 *^*)    continue;;
  44                 esac
  45                 if test -n "$use_separate_remote" &&
  46                    branch_name=`expr "z$name" : 'zheads/\(.*\)'`
  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         rm -f "$GIT_DIR/REMOTE_HEAD"
  57 }
  58
  59 # Read git-fetch-pack -k output and store the remote branches.
  60 copy_refs='
  61 use File::Path qw(mkpath);
  62 use File::Basename qw(dirname);
  63 my $git_dir = $ARGV[0];
  64 my $use_separate_remote = $ARGV[1];
  65 my $origin = $ARGV[2];
  66
  67 my $branch_top = ($use_separate_remote ? "remotes/$origin" : "heads");
  68 my $tag_top = "tags";
  69
  70 sub store {
  71         my ($sha1, $name, $top) = @_;
  72         $name = "$git_dir/refs/$top/$name";
  73         mkpath(dirname($name));
  74         open O, ">", "$name";
  75         print O "$sha1\n";
  76         close O;
  77 }
  78
  79 open FH, "<", "$git_dir/CLONE_HEAD";
  80 while (<FH>) {
  81         my ($sha1, $name) = /^([0-9a-f]{40})\s(.*)$/;
  82         next if ($name =~ /\^\173/);
  83         if ($name eq "HEAD") {
  84                 open O, ">", "$git_dir/REMOTE_HEAD";
  85                 print O "$sha1\n";
  86                 close O;
  87                 next;
  88         }
  89         if ($name =~ s/^refs\/heads\///) {
  90                 store($sha1, $name, $branch_top);
  91                 next;
  92         }
  93         if ($name =~ s/^refs\/tags\///) {
  94                 store($sha1, $name, $tag_top);
  95                 next;
  96         }
  97 }
  98 close FH;
  99 '
 100
 101 quiet=
 102 local=no
 103 use_local=no
 104 local_shared=no
 105 no_checkout=
 106 upload_pack=
 107 bare=
 108 reference=
 109 origin=
 110 origin_override=
 111 use_separate_remote=
 112 while
 113         case "$#,$1" in
 114         0,*) break ;;
 115         *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
 116         *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
 117           no_checkout=yes ;;
 118         *,--na|*,--nak|*,--nake|*,--naked|\
 119         *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
 120         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
 121         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
 122           local_shared=yes; use_local=yes ;;
 123         *,-q|*,--quiet) quiet=-q ;;
 124         *,--use-separate-remote)
 125                 use_separate_remote=t ;;
 126         1,--reference) usage ;;
 127         *,--reference)
 128                 shift; reference="$1" ;;
 129         *,--reference=*)
 130                 reference=`expr "$1" : '--reference=\(.*\)'` ;;
 131         *,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
 132                 case "$2" in
 133                 '')
 134                     usage ;;
 135                 */*)
 136                     echo >&2 "'$2' is not suitable for an origin name"
 137                     exit 1
 138                 esac
 139                 git-check-ref-format "heads/$2" || {
 140                     echo >&2 "'$2' is not suitable for a branch name"
 141                     exit 1
 142                 }
 143                 test -z "$origin_override" || {
 144                     echo >&2 "Do not give more than one --origin options."
 145                     exit 1
 146                 }
 147                 origin_override=yes
 148                 origin="$2"; shift
 149                 ;;
 150         1,-u|1,--upload-pack) usage ;;
 151         *,-u|*,--upload-pack)
 152                 shift
 153                 upload_pack="--exec=$1" ;;
 154         *,-*) usage ;;
 155         *) break ;;
 156         esac
 157 do
 158         shift
 159 done
 160
 161 repo="$1"
 162 if test -z "$repo"
 163 then
 164     echo >&2 'you must specify a repository to clone.'
 165     exit 1
 166 fi
 167
 168 # --bare implies --no-checkout
 169 if test yes = "$bare"
 170 then
 171         if test yes = "$origin_override"
 172         then
 173                 echo >&2 '--bare and --origin $origin options are incompatible.'
 174                 exit 1
 175         fi
 176         if test t = "$use_separate_remote"
 177         then
 178                 echo >&2 '--bare and --use-separate-remote options are incompatible.'
 179                 exit 1
 180         fi
 181         no_checkout=yes
 182 fi
 183
 184 if test -z "$origin"
 185 then
 186         origin=origin
 187 fi
 188
 189 # Turn the source into an absolute path if
 190 # it is local
 191 if base=$(get_repo_base "$repo"); then
 192         repo="$base"
 193         local=yes
 194 fi
 195
 196 dir="$2"
 197 # Try using "humanish" part of source repo if user didn't specify one
 198 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 199 [ -e "$dir" ] && echo "$dir already exists." && usage
 200 mkdir -p "$dir" &&
 201 D=$(cd "$dir" && pwd) &&
 202 trap 'err=$?; cd ..; rm -r "$D"; exit $err' exit
 203 case "$bare" in
 204 yes) GIT_DIR="$D" ;;
 205 *) GIT_DIR="$D/.git" ;;
 206 esac && export GIT_DIR && git-init-db || usage
 207 case "$bare" in
 208 yes)
 209         GIT_DIR="$D" ;;
 210 *)
 211         GIT_DIR="$D/.git" ;;
 212 esac
 213
 214 if test -n "$reference"
 215 then
 216         if test -d "$reference"
 217         then
 218                 if test -d "$reference/.git/objects"
 219                 then
 220                         reference="$reference/.git"
 221                 fi
 222                 reference=$(cd "$reference" && pwd)
 223                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 224                 (cd "$reference" && tar cf - refs) |
 225                 (cd "$GIT_DIR/refs" &&
 226                  mkdir reference-tmp &&
 227                  cd reference-tmp &&
 228                  tar xf -)
 229         else
 230                 echo >&2 "$reference: not a local directory." && usage
 231         fi
 232 fi
 233
 234 rm -f "$GIT_DIR/CLONE_HEAD"
 235
 236 # We do local magic only when the user tells us to.
 237 case "$local,$use_local" in
 238 yes,yes)
 239         ( cd "$repo/objects" ) || {
 240                 echo >&2 "-l flag seen but $repo is not local."
 241                 exit 1
 242         }
 243
 244         case "$local_shared" in
 245         no)
 246             # See if we can hardlink and drop "l" if not.
 247             sample_file=$(cd "$repo" && \
 248                           find objects -type f -print | sed -e 1q)
 249
 250             # objects directory should not be empty since we are cloning!
 251             test -f "$repo/$sample_file" || exit
 252
 253             l=
 254             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 255             then
 256                     l=l
 257             fi &&
 258             rm -f "$GIT_DIR/objects/sample" &&
 259             cd "$repo" &&
 260             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 261             ;;
 262         yes)
 263             mkdir -p "$GIT_DIR/objects/info"
 264             {
 265                 test -f "$repo/objects/info/alternates" &&
 266                 cat "$repo/objects/info/alternates";
 267                 echo "$repo/objects"
 268             } >"$GIT_DIR/objects/info/alternates"
 269             ;;
 270         esac
 271         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 272         ;;
 273 *)
 274         case "$repo" in
 275         rsync://*)
 276                 rsync $quiet -av --ignore-existing  \
 277                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 278                 exit
 279                 # Look at objects/info/alternates for rsync -- http will
 280                 # support it natively and git native ones will do it on the
 281                 # remote end.  Not having that file is not a crime.
 282                 rsync -q "$repo/objects/info/alternates" \
 283                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 284                         rm -f "$GIT_DIR/TMP_ALT"
 285                 if test -f "$GIT_DIR/TMP_ALT"
 286                 then
 287                     ( cd "$D" &&
 288                       . git-parse-remote &&
 289                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 290                     while read alt
 291                     do
 292                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 293                         case "$quiet" in
 294                         '')     echo >&2 "Getting alternate: $alt" ;;
 295                         esac
 296                         rsync $quiet -av --ignore-existing  \
 297                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 298                     done
 299                     rm -f "$GIT_DIR/TMP_ALT"
 300                 fi
 301                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 302                 ;;
 303         http://*)
 304                 if test -z "@@NO_CURL@@"
 305                 then
 306                         clone_dumb_http "$repo" "$D"
 307                 else
 308                         echo >&2 "http transport not supported, rebuild Git with curl support"
 309                         exit 1
 310                 fi
 311                 ;;
 312         *)
 313                 cd "$D" && case "$upload_pack" in
 314                 '') git-fetch-pack --all -k $quiet "$repo" ;;
 315                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 316                 esac >"$GIT_DIR/CLONE_HEAD" || {
 317                         echo >&2 "fetch-pack from '$repo' failed."
 318                         exit 1
 319                 }
 320                 ;;
 321         esac
 322         ;;
 323 esac
 324 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 325
 326 if test -f "$GIT_DIR/CLONE_HEAD"
 327 then
 328         # Read git-fetch-pack -k output and store the remote branches.
 329         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
 330 fi
 331
 332 cd "$D" || exit
 333
 334 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 335 then
 336         # Figure out which remote branch HEAD points at.
 337         case "$use_separate_remote" in
 338         '')     remote_top=refs/heads ;;
 339         *)      remote_top="refs/remotes/$origin" ;;
 340         esac
 341
 342         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 343         case "$head_sha1" in
 344         'ref: refs/'*)
 345                 # Uh-oh, the remote told us (http transport done against
 346                 # new style repository with a symref HEAD).
 347                 # Ideally we should skip the guesswork but for now
 348                 # opt for minimum change.
 349                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
 350                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
 351                 ;;
 352         esac
 353
 354         # The name under $remote_top the remote HEAD seems to point at.
 355         head_points_at=$(
 356                 (
 357                         echo "master"
 358                         cd "$GIT_DIR/$remote_top" &&
 359                         find . -type f -print | sed -e 's/^\.\///'
 360                 ) | (
 361                 done=f
 362                 while read name
 363                 do
 364                         test t = $done && continue
 365                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 366                         if test "$head_sha1" = "$branch_tip"
 367                         then
 368                                 echo "$name"
 369                                 done=t
 370                         fi
 371                 done
 372                 )
 373         )
 374
 375         # Write out remotes/$origin file, and update our "$head_points_at".
 376         case "$head_points_at" in
 377         ?*)
 378                 mkdir -p "$GIT_DIR/remotes" &&
 379                 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
 380                 case "$use_separate_remote" in
 381                 t)      origin_track="$remote_top/$head_points_at"
 382                         git-update-ref HEAD "$head_sha1" ;;
 383                 *)      origin_track="$remote_top/$origin"
 384                         git-update-ref "refs/heads/$origin" "$head_sha1" ;;
 385                 esac &&
 386                 echo >"$GIT_DIR/remotes/$origin" \
 387                 "URL: $repo
 388 Pull: refs/heads/$head_points_at:$origin_track" &&
 389                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
 390                 while read dotslref
 391                 do
 392                         name=`expr "$dotslref" : './\(.*\)'` &&
 393                         test "$use_separate_remote" = '' && {
 394                                 test "$head_points_at" = "$name" ||
 395                                 test "$origin" = "$name"
 396                         } ||
 397                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
 398                 done >>"$GIT_DIR/remotes/$origin" &&
 399                 case "$use_separate_remote" in
 400                 t)
 401                         rm -f "refs/remotes/$origin/HEAD"
 402                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
 403                                 "refs/remotes/$origin/$head_points_at"
 404                 esac
 405         esac
 406
 407         case "$no_checkout" in
 408         '')
 409                 git-read-tree -m -u -v HEAD HEAD
 410         esac
 411 fi
 412 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 413
 414 trap - exit
 415