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 [--template=<template_directory>] [--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_DIR/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, $tag_top);
  95                 next;
  96         }
  97 }
  98 close FH;
  99 '
 100
 101 quiet=
 102 local=no
 103 use_local=no
 104 local_shared=no
 105 unset template
 106 no_checkout=
 107 upload_pack=
 108 bare=
 109 reference=
 110 origin=
 111 origin_override=
 112 use_separate_remote=
 113 while
 114         case "$#,$1" in
 115         0,*) break ;;
 116         *,-n|*,--no|*,--no-|*,--no-c|*,--no-ch|*,--no-che|*,--no-chec|\
 117         *,--no-check|*,--no-checko|*,--no-checkou|*,--no-checkout)
 118           no_checkout=yes ;;
 119         *,--na|*,--nak|*,--nake|*,--naked|\
 120         *,-b|*,--b|*,--ba|*,--bar|*,--bare) bare=yes ;;
 121         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
 122         *,-s|*,--s|*,--sh|*,--sha|*,--shar|*,--share|*,--shared)
 123           local_shared=yes; use_local=yes ;;
 124         1,--template) usage ;;
 125         *,--template)
 126                 shift; template="--template=$1" ;;
 127         *,--template=*)
 128           template="$1" ;;
 129         *,-q|*,--quiet) quiet=-q ;;
 130         *,--use-separate-remote)
 131                 use_separate_remote=t ;;
 132         1,--reference) usage ;;
 133         *,--reference)
 134                 shift; reference="$1" ;;
 135         *,--reference=*)
 136                 reference=`expr "z$1" : 'z--reference=\(.*\)'` ;;
 137         *,-o|*,--or|*,--ori|*,--orig|*,--origi|*,--origin)
 138                 case "$2" in
 139                 '')
 140                     usage ;;
 141                 */*)
 142                     echo >&2 "'$2' is not suitable for an origin name"
 143                     exit 1
 144                 esac
 145                 git-check-ref-format "heads/$2" || {
 146                     echo >&2 "'$2' is not suitable for a branch name"
 147                     exit 1
 148                 }
 149                 test -z "$origin_override" || {
 150                     echo >&2 "Do not give more than one --origin options."
 151                     exit 1
 152                 }
 153                 origin_override=yes
 154                 origin="$2"; shift
 155                 ;;
 156         1,-u|1,--upload-pack) usage ;;
 157         *,-u|*,--upload-pack)
 158                 shift
 159                 upload_pack="--exec=$1" ;;
 160         *,-*) usage ;;
 161         *) break ;;
 162         esac
 163 do
 164         shift
 165 done
 166
 167 repo="$1"
 168 if test -z "$repo"
 169 then
 170     echo >&2 'you must specify a repository to clone.'
 171     exit 1
 172 fi
 173
 174 # --bare implies --no-checkout
 175 if test yes = "$bare"
 176 then
 177         if test yes = "$origin_override"
 178         then
 179                 echo >&2 '--bare and --origin $origin options are incompatible.'
 180                 exit 1
 181         fi
 182         if test t = "$use_separate_remote"
 183         then
 184                 echo >&2 '--bare and --use-separate-remote options are incompatible.'
 185                 exit 1
 186         fi
 187         no_checkout=yes
 188 fi
 189
 190 if test -z "$origin"
 191 then
 192         origin=origin
 193 fi
 194
 195 # Turn the source into an absolute path if
 196 # it is local
 197 if base=$(get_repo_base "$repo"); then
 198         repo="$base"
 199         local=yes
 200 fi
 201
 202 dir="$2"
 203 # Try using "humanish" part of source repo if user didn't specify one
 204 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 205 [ -e "$dir" ] && echo "$dir already exists." && usage
 206 mkdir -p "$dir" &&
 207 D=$(cd "$dir" && pwd) &&
 208 trap 'err=$?; cd ..; rm -r "$D"; exit $err' 0
 209 case "$bare" in
 210 yes)
 211         GIT_DIR="$D" ;;
 212 *)
 213         GIT_DIR="$D/.git" ;;
 214 esac && export GIT_DIR && git-init-db ${template+"$template"} || usage
 215
 216 if test -n "$reference"
 217 then
 218         if test -d "$reference"
 219         then
 220                 if test -d "$reference/.git/objects"
 221                 then
 222                         reference="$reference/.git"
 223                 fi
 224                 reference=$(cd "$reference" && pwd)
 225                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 226                 (cd "$reference" && tar cf - refs) |
 227                 (cd "$GIT_DIR/refs" &&
 228                  mkdir reference-tmp &&
 229                  cd reference-tmp &&
 230                  tar xf -)
 231         else
 232                 echo >&2 "$reference: not a local directory." && usage
 233         fi
 234 fi
 235
 236 rm -f "$GIT_DIR/CLONE_HEAD"
 237
 238 # We do local magic only when the user tells us to.
 239 case "$local,$use_local" in
 240 yes,yes)
 241         ( cd "$repo/objects" ) || {
 242                 echo >&2 "-l flag seen but $repo is not local."
 243                 exit 1
 244         }
 245
 246         case "$local_shared" in
 247         no)
 248             # See if we can hardlink and drop "l" if not.
 249             sample_file=$(cd "$repo" && \
 250                           find objects -type f -print | sed -e 1q)
 251
 252             # objects directory should not be empty since we are cloning!
 253             test -f "$repo/$sample_file" || exit
 254
 255             l=
 256             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 257             then
 258                     l=l
 259             fi &&
 260             rm -f "$GIT_DIR/objects/sample" &&
 261             cd "$repo" &&
 262             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 263             ;;
 264         yes)
 265             mkdir -p "$GIT_DIR/objects/info"
 266             echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
 267             ;;
 268         esac
 269         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 270         ;;
 271 *)
 272         case "$repo" in
 273         rsync://*)
 274                 rsync $quiet -av --ignore-existing  \
 275                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 276                 exit
 277                 # Look at objects/info/alternates for rsync -- http will
 278                 # support it natively and git native ones will do it on the
 279                 # remote end.  Not having that file is not a crime.
 280                 rsync -q "$repo/objects/info/alternates" \
 281                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 282                         rm -f "$GIT_DIR/TMP_ALT"
 283                 if test -f "$GIT_DIR/TMP_ALT"
 284                 then
 285                     ( cd "$D" &&
 286                       . git-parse-remote &&
 287                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 288                     while read alt
 289                     do
 290                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 291                         case "$quiet" in
 292                         '')     echo >&2 "Getting alternate: $alt" ;;
 293                         esac
 294                         rsync $quiet -av --ignore-existing  \
 295                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 296                     done
 297                     rm -f "$GIT_DIR/TMP_ALT"
 298                 fi
 299                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 300                 ;;
 301         http://*)
 302                 if test -z "@@NO_CURL@@"
 303                 then
 304                         clone_dumb_http "$repo" "$D"
 305                 else
 306                         echo >&2 "http transport not supported, rebuild Git with curl support"
 307                         exit 1
 308                 fi
 309                 ;;
 310         *)
 311                 cd "$D" && case "$upload_pack" in
 312                 '') git-fetch-pack --all -k $quiet "$repo" ;;
 313                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 314                 esac >"$GIT_DIR/CLONE_HEAD" || {
 315                         echo >&2 "fetch-pack from '$repo' failed."
 316                         exit 1
 317                 }
 318                 ;;
 319         esac
 320         ;;
 321 esac
 322 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 323
 324 if test -f "$GIT_DIR/CLONE_HEAD"
 325 then
 326         # Read git-fetch-pack -k output and store the remote branches.
 327         @@PERL@@ -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
 328 fi
 329
 330 cd "$D" || exit
 331
 332 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 333 then
 334         # Figure out which remote branch HEAD points at.
 335         case "$use_separate_remote" in
 336         '')     remote_top=refs/heads ;;
 337         *)      remote_top="refs/remotes/$origin" ;;
 338         esac
 339
 340         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 341         case "$head_sha1" in
 342         'ref: refs/'*)
 343                 # Uh-oh, the remote told us (http transport done against
 344                 # new style repository with a symref HEAD).
 345                 # Ideally we should skip the guesswork but for now
 346                 # opt for minimum change.
 347                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
 348                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
 349                 ;;
 350         esac
 351
 352         # The name under $remote_top the remote HEAD seems to point at.
 353         head_points_at=$(
 354                 (
 355                         echo "master"
 356                         cd "$GIT_DIR/$remote_top" &&
 357                         find . -type f -print | sed -e 's/^\.\///'
 358                 ) | (
 359                 done=f
 360                 while read name
 361                 do
 362                         test t = $done && continue
 363                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 364                         if test "$head_sha1" = "$branch_tip"
 365                         then
 366                                 echo "$name"
 367                                 done=t
 368                         fi
 369                 done
 370                 )
 371         )
 372
 373         # Write out remotes/$origin file, and update our "$head_points_at".
 374         case "$head_points_at" in
 375         ?*)
 376                 mkdir -p "$GIT_DIR/remotes" &&
 377                 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
 378                 case "$use_separate_remote" in
 379                 t)      origin_track="$remote_top/$head_points_at"
 380                         git-update-ref HEAD "$head_sha1" ;;
 381                 *)      origin_track="$remote_top/$origin"
 382                         git-update-ref "refs/heads/$origin" "$head_sha1" ;;
 383                 esac &&
 384                 echo >"$GIT_DIR/remotes/$origin" \
 385                 "URL: $repo
 386 Pull: refs/heads/$head_points_at:$origin_track" &&
 387                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
 388                 while read dotslref
 389                 do
 390                         name=`expr "$dotslref" : './\(.*\)'`
 391                         if test "z$head_points_at" = "z$name"
 392                         then
 393                                 continue
 394                         fi
 395                         if test "$use_separate_remote" = '' &&
 396                            test "z$origin" = "z$name"
 397                         then
 398                                 continue
 399                         fi
 400                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
 401                 done >>"$GIT_DIR/remotes/$origin" &&
 402                 case "$use_separate_remote" in
 403                 t)
 404                         rm -f "refs/remotes/$origin/HEAD"
 405                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
 406                                 "refs/remotes/$origin/$head_points_at"
 407                 esac
 408         esac
 409
 410         case "$no_checkout" in
 411         '')
 412                 git-read-tree -m -u -v HEAD HEAD
 413         esac
 414 fi
 415 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 416
 417 trap - 0
 418