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 "$2" &&
  32         clone_tmp='.git/clone-tmp' &&
  33         mkdir -p "$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 "$1" : '--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) GIT_DIR="$D" ;;
 211 *) GIT_DIR="$D/.git" ;;
 212 esac && export GIT_DIR && git-init-db ${template+"$template"} || usage
 213 case "$bare" in
 214 yes)
 215         GIT_DIR="$D" ;;
 216 *)
 217         GIT_DIR="$D/.git" ;;
 218 esac
 219
 220 if test -n "$reference"
 221 then
 222         if test -d "$reference"
 223         then
 224                 if test -d "$reference/.git/objects"
 225                 then
 226                         reference="$reference/.git"
 227                 fi
 228                 reference=$(cd "$reference" && pwd)
 229                 echo "$reference/objects" >"$GIT_DIR/objects/info/alternates"
 230                 (cd "$reference" && tar cf - refs) |
 231                 (cd "$GIT_DIR/refs" &&
 232                  mkdir reference-tmp &&
 233                  cd reference-tmp &&
 234                  tar xf -)
 235         else
 236                 echo >&2 "$reference: not a local directory." && usage
 237         fi
 238 fi
 239
 240 rm -f "$GIT_DIR/CLONE_HEAD"
 241
 242 # We do local magic only when the user tells us to.
 243 case "$local,$use_local" in
 244 yes,yes)
 245         ( cd "$repo/objects" ) || {
 246                 echo >&2 "-l flag seen but $repo is not local."
 247                 exit 1
 248         }
 249
 250         case "$local_shared" in
 251         no)
 252             # See if we can hardlink and drop "l" if not.
 253             sample_file=$(cd "$repo" && \
 254                           find objects -type f -print | sed -e 1q)
 255
 256             # objects directory should not be empty since we are cloning!
 257             test -f "$repo/$sample_file" || exit
 258
 259             l=
 260             if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 261             then
 262                     l=l
 263             fi &&
 264             rm -f "$GIT_DIR/objects/sample" &&
 265             cd "$repo" &&
 266             find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 267             ;;
 268         yes)
 269             mkdir -p "$GIT_DIR/objects/info"
 270             echo "$repo/objects" >> "$GIT_DIR/objects/info/alternates"
 271             ;;
 272         esac
 273         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 274         ;;
 275 *)
 276         case "$repo" in
 277         rsync://*)
 278                 rsync $quiet -av --ignore-existing  \
 279                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 280                 exit
 281                 # Look at objects/info/alternates for rsync -- http will
 282                 # support it natively and git native ones will do it on the
 283                 # remote end.  Not having that file is not a crime.
 284                 rsync -q "$repo/objects/info/alternates" \
 285                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 286                         rm -f "$GIT_DIR/TMP_ALT"
 287                 if test -f "$GIT_DIR/TMP_ALT"
 288                 then
 289                     ( cd "$D" &&
 290                       . git-parse-remote &&
 291                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 292                     while read alt
 293                     do
 294                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 295                         case "$quiet" in
 296                         '')     echo >&2 "Getting alternate: $alt" ;;
 297                         esac
 298                         rsync $quiet -av --ignore-existing  \
 299                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 300                     done
 301                     rm -f "$GIT_DIR/TMP_ALT"
 302                 fi
 303                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD"
 304                 ;;
 305         http://*)
 306                 if test -z "@@NO_CURL@@"
 307                 then
 308                         clone_dumb_http "$repo" "$D"
 309                 else
 310                         echo >&2 "http transport not supported, rebuild Git with curl support"
 311                         exit 1
 312                 fi
 313                 ;;
 314         *)
 315                 cd "$D" && case "$upload_pack" in
 316                 '') git-fetch-pack --all -k $quiet "$repo" ;;
 317                 *) git-fetch-pack --all -k $quiet "$upload_pack" "$repo" ;;
 318                 esac >"$GIT_DIR/CLONE_HEAD" || {
 319                         echo >&2 "fetch-pack from '$repo' failed."
 320                         exit 1
 321                 }
 322                 ;;
 323         esac
 324         ;;
 325 esac
 326 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 327
 328 if test -f "$GIT_DIR/CLONE_HEAD"
 329 then
 330         # Read git-fetch-pack -k output and store the remote branches.
 331         perl -e "$copy_refs" "$GIT_DIR" "$use_separate_remote" "$origin"
 332 fi
 333
 334 cd "$D" || exit
 335
 336 if test -z "$bare" && test -f "$GIT_DIR/REMOTE_HEAD"
 337 then
 338         # Figure out which remote branch HEAD points at.
 339         case "$use_separate_remote" in
 340         '')     remote_top=refs/heads ;;
 341         *)      remote_top="refs/remotes/$origin" ;;
 342         esac
 343
 344         head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 345         case "$head_sha1" in
 346         'ref: refs/'*)
 347                 # Uh-oh, the remote told us (http transport done against
 348                 # new style repository with a symref HEAD).
 349                 # Ideally we should skip the guesswork but for now
 350                 # opt for minimum change.
 351                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
 352                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
 353                 ;;
 354         esac
 355
 356         # The name under $remote_top the remote HEAD seems to point at.
 357         head_points_at=$(
 358                 (
 359                         echo "master"
 360                         cd "$GIT_DIR/$remote_top" &&
 361                         find . -type f -print | sed -e 's/^\.\///'
 362                 ) | (
 363                 done=f
 364                 while read name
 365                 do
 366                         test t = $done && continue
 367                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 368                         if test "$head_sha1" = "$branch_tip"
 369                         then
 370                                 echo "$name"
 371                                 done=t
 372                         fi
 373                 done
 374                 )
 375         )
 376
 377         # Write out remotes/$origin file, and update our "$head_points_at".
 378         case "$head_points_at" in
 379         ?*)
 380                 mkdir -p "$GIT_DIR/remotes" &&
 381                 git-symbolic-ref HEAD "refs/heads/$head_points_at" &&
 382                 case "$use_separate_remote" in
 383                 t)      origin_track="$remote_top/$head_points_at"
 384                         git-update-ref HEAD "$head_sha1" ;;
 385                 *)      origin_track="$remote_top/$origin"
 386                         git-update-ref "refs/heads/$origin" "$head_sha1" ;;
 387                 esac &&
 388                 echo >"$GIT_DIR/remotes/$origin" \
 389                 "URL: $repo
 390 Pull: refs/heads/$head_points_at:$origin_track" &&
 391                 (cd "$GIT_DIR/$remote_top" && find . -type f -print) |
 392                 while read dotslref
 393                 do
 394                         name=`expr "$dotslref" : './\(.*\)'` &&
 395                         test "$use_separate_remote" = '' && {
 396                                 test "$head_points_at" = "$name" ||
 397                                 test "$origin" = "$name"
 398                         } ||
 399                         echo "Pull: refs/heads/${name}:$remote_top/${name}"
 400                 done >>"$GIT_DIR/remotes/$origin" &&
 401                 case "$use_separate_remote" in
 402                 t)
 403                         rm -f "refs/remotes/$origin/HEAD"
 404                         git-symbolic-ref "refs/remotes/$origin/HEAD" \
 405                                 "refs/remotes/$origin/$head_points_at"
 406                 esac
 407         esac
 408
 409         case "$no_checkout" in
 410         '')
 411                 git-read-tree -m -u -v HEAD HEAD
 412         esac
 413 fi
 414 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 415
 416 trap - 0
 417