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 OPTIONS_SPEC="\
  12 git-clone [options] [--] <repo> [<dir>]
  13 --
  14 n,no-checkout        don't create a checkout
  15 bare                 create a bare repository
  16 naked                create a bare repository
  17 l,local              to clone from a local repository
  18 no-hardlinks         don't use local hardlinks, always copy
  19 s,shared             setup as a shared repository
  20 template=            path to the template directory
  21 q,quiet              be quiet
  22 reference=           reference repository
  23 o,origin=            use <name> instead of 'origin' to track upstream
  24 u,upload-pack=       path to git-upload-pack on the remote
  25 depth=               create a shallow clone of that depth
  26
  27 use-separate-remote  compatibility, do not use
  28 no-separate-remote   compatibility, do not use"
  29
  30 die() {
  31         echo >&2 "$@"
  32         exit 1
  33 }
  34
  35 usage() {
  36         exec "$0" -h
  37 }
  38
  39 eval "$(echo "$OPTIONS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
  40
  41 get_repo_base() {
  42         (
  43                 cd "`/bin/pwd`" &&
  44                 cd "$1" || cd "$1.git" &&
  45                 {
  46                         cd .git
  47                         pwd
  48                 }
  49         ) 2>/dev/null
  50 }
  51
  52 if [ -n "$GIT_SSL_NO_VERIFY" -o \
  53         "`git config --bool http.sslVerify`" = false ]; then
  54     curl_extra_args="-k"
  55 fi
  56
  57 http_fetch () {
  58         # $1 = Remote, $2 = Local
  59         curl -nsfL $curl_extra_args "$1" >"$2"
  60         curl_exit_status=$?
  61         case $curl_exit_status in
  62         126|127) exit ;;
  63         *)       return $curl_exit_status ;;
  64         esac
  65 }
  66
  67 clone_dumb_http () {
  68         # $1 - remote, $2 - local
  69         cd "$2" &&
  70         clone_tmp="$GIT_DIR/clone-tmp" &&
  71         mkdir -p "$clone_tmp" || exit 1
  72         if [ -n "$GIT_CURL_FTP_NO_EPSV" -o \
  73                 "`git config --bool http.noEPSV`" = true ]; then
  74                 curl_extra_args="${curl_extra_args} --disable-epsv"
  75         fi
  76         http_fetch "$1/info/refs" "$clone_tmp/refs" ||
  77                 die "Cannot get remote repository information.
  78 Perhaps git-update-server-info needs to be run there?"
  79         test "z$quiet" = z && v=-v || v=
  80         while read sha1 refname
  81         do
  82                 name=`expr "z$refname" : 'zrefs/\(.*\)'` &&
  83                 case "$name" in
  84                 *^*)    continue;;
  85                 esac
  86                 case "$bare,$name" in
  87                 yes,* | ,heads/* | ,tags/*) ;;
  88                 *)      continue ;;
  89                 esac
  90                 if test -n "$use_separate_remote" &&
  91                    branch_name=`expr "z$name" : 'zheads/\(.*\)'`
  92                 then
  93                         tname="remotes/$origin/$branch_name"
  94                 else
  95                         tname=$name
  96                 fi
  97                 git-http-fetch $v -a -w "$tname" "$sha1" "$1" || exit 1
  98         done <"$clone_tmp/refs"
  99         rm -fr "$clone_tmp"
 100         http_fetch "$1/HEAD" "$GIT_DIR/REMOTE_HEAD" ||
 101         rm -f "$GIT_DIR/REMOTE_HEAD"
 102         if test -f "$GIT_DIR/REMOTE_HEAD"; then
 103                 head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 104                 case "$head_sha1" in
 105                 'ref: refs/'*)
 106                         ;;
 107                 *)
 108                         git-http-fetch $v -a "$head_sha1" "$1" ||
 109                         rm -f "$GIT_DIR/REMOTE_HEAD"
 110                         ;;
 111                 esac
 112         fi
 113 }
 114
 115 quiet=
 116 local=no
 117 use_local_hardlink=yes
 118 local_shared=no
 119 unset template
 120 no_checkout=
 121 upload_pack=
 122 bare=
 123 reference=
 124 origin=
 125 origin_override=
 126 use_separate_remote=t
 127 depth=
 128 no_progress=
 129 local_explicitly_asked_for=
 130 test -t 1 || no_progress=--no-progress
 131
 132 while test $# != 0
 133 do
 134         case "$1" in
 135         -n|--no-checkout)
 136                 no_checkout=yes ;;
 137         --naked|--bare)
 138                 bare=yes ;;
 139         -l|--local)
 140                 local_explicitly_asked_for=yes
 141                 use_local_hardlink=yes
 142                 ;;
 143         --no-hardlinks)
 144                 use_local_hardlink=no ;;
 145         -s|--shared)
 146                 local_shared=yes ;;
 147         --template)
 148                 shift; template="--template=$1" ;;
 149         -q|--quiet)
 150                 quiet=-q ;;
 151         --use-separate-remote|--no-separate-remote)
 152                 die "clones are always made with separate-remote layout" ;;
 153         --reference)
 154                 shift; reference="$1" ;;
 155         -o|--origin)
 156                 shift;
 157                 case "$1" in
 158                 '')
 159                     usage ;;
 160                 */*)
 161                     die "'$1' is not suitable for an origin name"
 162                 esac
 163                 git check-ref-format "heads/$1" ||
 164                     die "'$1' is not suitable for a branch name"
 165                 test -z "$origin_override" ||
 166                     die "Do not give more than one --origin options."
 167                 origin_override=yes
 168                 origin="$1"
 169                 ;;
 170         -u|--upload-pack)
 171                 shift
 172                 upload_pack="--upload-pack=$1" ;;
 173         --depth)
 174                 shift
 175                 depth="--depth=$1" ;;
 176         --)
 177                 shift
 178                 break ;;
 179         *)
 180                 usage ;;
 181         esac
 182         shift
 183 done
 184
 185 repo="$1"
 186 test -n "$repo" ||
 187     die 'you must specify a repository to clone.'
 188
 189 # --bare implies --no-checkout and --no-separate-remote
 190 if test yes = "$bare"
 191 then
 192         if test yes = "$origin_override"
 193         then
 194                 die '--bare and --origin $origin options are incompatible.'
 195         fi
 196         no_checkout=yes
 197         use_separate_remote=
 198 fi
 199
 200 if test -z "$origin"
 201 then
 202         origin=origin
 203 fi
 204
 205 # Turn the source into an absolute path if
 206 # it is local
 207 if base=$(get_repo_base "$repo"); then
 208         repo="$base"
 209         if test -z "$depth"
 210         then
 211                 local=yes
 212         fi
 213 fi
 214
 215 dir="$2"
 216 # Try using "humanish" part of source repo if user didn't specify one
 217 [ -z "$dir" ] && dir=$(echo "$repo" | sed -e 's|/$||' -e 's|:*/*\.git$||' -e 's|.*[/:]||g')
 218 [ -e "$dir" ] && die "destination directory '$dir' already exists."
 219 [ yes = "$bare" ] && unset GIT_WORK_TREE
 220 [ -n "$GIT_WORK_TREE" ] && [ -e "$GIT_WORK_TREE" ] &&
 221 die "working tree '$GIT_WORK_TREE' already exists."
 222 D=
 223 W=
 224 cleanup() {
 225         err=$?
 226         test -z "$D" && rm -rf "$dir"
 227         test -z "$W" && test -n "$GIT_WORK_TREE" && rm -rf "$GIT_WORK_TREE"
 228         cd ..
 229         test -n "$D" && rm -rf "$D"
 230         test -n "$W" && rm -rf "$W"
 231         exit $err
 232 }
 233 trap cleanup 0
 234 mkdir -p "$dir" && D=$(cd "$dir" && pwd) || usage
 235 test -n "$GIT_WORK_TREE" && mkdir -p "$GIT_WORK_TREE" &&
 236 W=$(cd "$GIT_WORK_TREE" && pwd) && GIT_WORK_TREE="$W" && export GIT_WORK_TREE
 237 if test yes = "$bare" || test -n "$GIT_WORK_TREE"; then
 238         GIT_DIR="$D"
 239 else
 240         GIT_DIR="$D/.git"
 241 fi &&
 242 export GIT_DIR &&
 243 GIT_CONFIG="$GIT_DIR/config" git-init $quiet ${template+"$template"} || usage
 244
 245 if test -n "$bare"
 246 then
 247         GIT_CONFIG="$GIT_DIR/config" git config core.bare true
 248 fi
 249
 250 if test -n "$reference"
 251 then
 252         ref_git=
 253         if test -d "$reference"
 254         then
 255                 if test -d "$reference/.git/objects"
 256                 then
 257                         ref_git="$reference/.git"
 258                 elif test -d "$reference/objects"
 259                 then
 260                         ref_git="$reference"
 261                 fi
 262         fi
 263         if test -n "$ref_git"
 264         then
 265                 ref_git=$(cd "$ref_git" && pwd)
 266                 echo "$ref_git/objects" >"$GIT_DIR/objects/info/alternates"
 267                 (
 268                         GIT_DIR="$ref_git" git for-each-ref \
 269                                 --format='%(objectname) %(*objectname)'
 270                 ) |
 271                 while read a b
 272                 do
 273                         test -z "$a" ||
 274                         git update-ref "refs/reference-tmp/$a" "$a"
 275                         test -z "$b" ||
 276                         git update-ref "refs/reference-tmp/$b" "$b"
 277                 done
 278         else
 279                 die "reference repository '$reference' is not a local directory."
 280         fi
 281 fi
 282
 283 rm -f "$GIT_DIR/CLONE_HEAD"
 284
 285 # We do local magic only when the user tells us to.
 286 case "$local" in
 287 yes)
 288         ( cd "$repo/objects" ) ||
 289                 die "cannot chdir to local '$repo/objects'."
 290
 291         if test "$local_shared" = yes
 292         then
 293                 mkdir -p "$GIT_DIR/objects/info"
 294                 echo "$repo/objects" >>"$GIT_DIR/objects/info/alternates"
 295         else
 296                 l= &&
 297                 if test "$use_local_hardlink" = yes
 298                 then
 299                         # See if we can hardlink and drop "l" if not.
 300                         sample_file=$(cd "$repo" && \
 301                                       find objects -type f -print | sed -e 1q)
 302                         # objects directory should not be empty because
 303                         # we are cloning!
 304                         test -f "$repo/$sample_file" ||
 305                                 die "fatal: cannot clone empty repository"
 306                         if ln "$repo/$sample_file" "$GIT_DIR/objects/sample" 2>/dev/null
 307                         then
 308                                 rm -f "$GIT_DIR/objects/sample"
 309                                 l=l
 310                         elif test -n "$local_explicitly_asked_for"
 311                         then
 312                                 echo >&2 "Warning: -l asked but cannot hardlink to $repo"
 313                         fi
 314                 fi &&
 315                 cd "$repo" &&
 316                 find objects -depth -print | cpio -pumd$l "$GIT_DIR/" || exit 1
 317         fi
 318         git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 319         ;;
 320 *)
 321         case "$repo" in
 322         rsync://*)
 323                 case "$depth" in
 324                 "") ;;
 325                 *) die "shallow over rsync not supported" ;;
 326                 esac
 327                 rsync $quiet -av --ignore-existing  \
 328                         --exclude info "$repo/objects/" "$GIT_DIR/objects/" ||
 329                 exit
 330                 # Look at objects/info/alternates for rsync -- http will
 331                 # support it natively and git native ones will do it on the
 332                 # remote end.  Not having that file is not a crime.
 333                 rsync -q "$repo/objects/info/alternates" \
 334                         "$GIT_DIR/TMP_ALT" 2>/dev/null ||
 335                         rm -f "$GIT_DIR/TMP_ALT"
 336                 if test -f "$GIT_DIR/TMP_ALT"
 337                 then
 338                     ( cd "$D" &&
 339                       . git-parse-remote &&
 340                       resolve_alternates "$repo" <"$GIT_DIR/TMP_ALT" ) |
 341                     while read alt
 342                     do
 343                         case "$alt" in 'bad alternate: '*) die "$alt";; esac
 344                         case "$quiet" in
 345                         '')     echo >&2 "Getting alternate: $alt" ;;
 346                         esac
 347                         rsync $quiet -av --ignore-existing  \
 348                             --exclude info "$alt" "$GIT_DIR/objects" || exit
 349                     done
 350                     rm -f "$GIT_DIR/TMP_ALT"
 351                 fi
 352                 git-ls-remote "$repo" >"$GIT_DIR/CLONE_HEAD" || exit 1
 353                 ;;
 354         https://*|http://*|ftp://*)
 355                 case "$depth" in
 356                 "") ;;
 357                 *) die "shallow over http or ftp not supported" ;;
 358                 esac
 359                 if test -z "@@NO_CURL@@"
 360                 then
 361                         clone_dumb_http "$repo" "$D"
 362                 else
 363                         die "http transport not supported, rebuild Git with curl support"
 364                 fi
 365                 ;;
 366         *)
 367                 case "$upload_pack" in
 368                 '') git-fetch-pack --all -k $quiet $depth $no_progress "$repo";;
 369                 *) git-fetch-pack --all -k $quiet "$upload_pack" $depth $no_progress "$repo" ;;
 370                 esac >"$GIT_DIR/CLONE_HEAD" ||
 371                         die "fetch-pack from '$repo' failed."
 372                 ;;
 373         esac
 374         ;;
 375 esac
 376 test -d "$GIT_DIR/refs/reference-tmp" && rm -fr "$GIT_DIR/refs/reference-tmp"
 377
 378 if test -f "$GIT_DIR/CLONE_HEAD"
 379 then
 380         # Read git-fetch-pack -k output and store the remote branches.
 381         if [ -n "$use_separate_remote" ]
 382         then
 383                 branch_top="remotes/$origin"
 384         else
 385                 branch_top="heads"
 386         fi
 387         tag_top="tags"
 388         while read sha1 name
 389         do
 390                 case "$name" in
 391                 *'^{}')
 392                         continue ;;
 393                 HEAD)
 394                         destname="REMOTE_HEAD" ;;
 395                 refs/heads/*)
 396                         destname="refs/$branch_top/${name#refs/heads/}" ;;
 397                 refs/tags/*)
 398                         destname="refs/$tag_top/${name#refs/tags/}" ;;
 399                 *)
 400                         continue ;;
 401                 esac
 402                 git update-ref -m "clone: from $repo" "$destname" "$sha1" ""
 403         done < "$GIT_DIR/CLONE_HEAD"
 404 fi
 405
 406 if test -n "$W"; then
 407         cd "$W" || exit
 408 else
 409         cd "$D" || exit
 410 fi
 411
 412 if test -z "$bare"
 413 then
 414         # a non-bare repository is always in separate-remote layout
 415         remote_top="refs/remotes/$origin"
 416         head_sha1=
 417         test ! -r "$GIT_DIR/REMOTE_HEAD" || head_sha1=`cat "$GIT_DIR/REMOTE_HEAD"`
 418         case "$head_sha1" in
 419         'ref: refs/'*)
 420                 # Uh-oh, the remote told us (http transport done against
 421                 # new style repository with a symref HEAD).
 422                 # Ideally we should skip the guesswork but for now
 423                 # opt for minimum change.
 424                 head_sha1=`expr "z$head_sha1" : 'zref: refs/heads/\(.*\)'`
 425                 head_sha1=`cat "$GIT_DIR/$remote_top/$head_sha1"`
 426                 ;;
 427         esac
 428
 429         # The name under $remote_top the remote HEAD seems to point at.
 430         head_points_at=$(
 431                 (
 432                         test -f "$GIT_DIR/$remote_top/master" && echo "master"
 433                         cd "$GIT_DIR/$remote_top" &&
 434                         find . -type f -print | sed -e 's/^\.\///'
 435                 ) | (
 436                 done=f
 437                 while read name
 438                 do
 439                         test t = $done && continue
 440                         branch_tip=`cat "$GIT_DIR/$remote_top/$name"`
 441                         if test "$head_sha1" = "$branch_tip"
 442                         then
 443                                 echo "$name"
 444                                 done=t
 445                         fi
 446                 done
 447                 )
 448         )
 449
 450         # Upstream URL
 451         git config remote."$origin".url "$repo" &&
 452
 453         # Set up the mappings to track the remote branches.
 454         git config remote."$origin".fetch \
 455                 "+refs/heads/*:$remote_top/*" '^$' &&
 456
 457         # Write out remote.$origin config, and update our "$head_points_at".
 458         case "$head_points_at" in
 459         ?*)
 460                 # Local default branch
 461                 git symbolic-ref HEAD "refs/heads/$head_points_at" &&
 462
 463                 # Tracking branch for the primary branch at the remote.
 464                 git update-ref HEAD "$head_sha1" &&
 465
 466                 rm -f "refs/remotes/$origin/HEAD"
 467                 git symbolic-ref "refs/remotes/$origin/HEAD" \
 468                         "refs/remotes/$origin/$head_points_at" &&
 469
 470                 git config branch."$head_points_at".remote "$origin" &&
 471                 git config branch."$head_points_at".merge "refs/heads/$head_points_at"
 472                 ;;
 473         '')
 474                 if test -z "$head_sha1"
 475                 then
 476                         # Source had nonexistent ref in HEAD
 477                         echo >&2 "Warning: Remote HEAD refers to nonexistent ref, unable to checkout."
 478                         no_checkout=t
 479                 else
 480                         # Source had detached HEAD pointing nowhere
 481                         git update-ref --no-deref HEAD "$head_sha1" &&
 482                         rm -f "refs/remotes/$origin/HEAD"
 483                 fi
 484                 ;;
 485         esac
 486
 487         case "$no_checkout" in
 488         '')
 489                 test "z$quiet" = z -a "z$no_progress" = z && v=-v || v=
 490                 git read-tree -m -u $v HEAD HEAD
 491         esac
 492 fi
 493 rm -f "$GIT_DIR/CLONE_HEAD" "$GIT_DIR/REMOTE_HEAD"
 494
 495 trap - 0