git-clone-script

   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 usage() {
   9         echo >&2 "* git clone [-l] [-q] [-u <upload-pack>] <repo> <dir>"
  10         exit 1
  11 }
  12
  13 get_repo_base() {
  14         (cd "$1" && (cd .git ; pwd)) 2> /dev/null
  15 }
  16
  17 quiet=
  18 use_local=no
  19 upload_pack=
  20 while
  21         case "$#,$1" in
  22         0,*) break ;;
  23         *,-l|*,--l|*,--lo|*,--loc|*,--loca|*,--local) use_local=yes ;;
  24         *,-q|*,--quiet) quiet=-q ;;
  25         1,-u|*,--upload-pack) usage ;;
  26         *,-u|*,--upload-pack)
  27                 shift
  28                 upload_pack="--exec=$2" ;;
  29         *,-*) usage ;;
  30         *) break ;;
  31         esac
  32 do
  33         shift
  34 done
  35
  36 # Turn the source into an absolute path if
  37 # it is local
  38 repo="$1"
  39 local=no
  40 if base=$(get_repo_base "$repo"); then
  41         repo="$base"
  42         local=yes
  43 fi
  44
  45 dir="$2"
  46 mkdir "$dir" &&
  47 D=$(
  48         (cd "$dir" && git-init-db && pwd)
  49 ) &&
  50 test -d "$D" || usage
  51
  52 # We do local magic only when the user tells us to.
  53 case "$local,$use_local" in
  54 yes,yes)
  55         ( cd "$repo/objects" ) || {
  56                 echo >&2 "-l flag seen but $repo is not local."
  57                 exit 1
  58         }
  59
  60         # See if we can hardlink and drop "l" if not.
  61         sample_file=$(cd "$repo" && \
  62                       find objects -type f -print | sed -e 1q)
  63
  64         # objects directory should not be empty since we are cloning!
  65         test -f "$repo/$sample_file" || exit
  66
  67         l=
  68         if ln "$repo/$sample_file" "$D/.git/objects/sample" 2>/dev/null
  69         then
  70                 l=l
  71         fi &&
  72         rm -f "$D/.git/objects/sample" &&
  73         cd "$repo" &&
  74         find objects -type f -print |
  75         cpio -puamd$l "$D/.git/" || exit 1
  76
  77         # Make a duplicate of refs and HEAD pointer
  78         HEAD=
  79         if test -f "$repo/HEAD"
  80         then
  81                 HEAD=HEAD
  82         fi
  83         tar Ccf "$repo" - refs $HEAD | tar Cxf "$D/.git" - || exit 1
  84         exit 0
  85         ;;
  86 esac
  87
  88 case "$repo" in
  89 rsync://*)
  90         rsync $quiet -avz --ignore-existing "$repo/objects/" "$D/.git/objects/" &&
  91         rsync $quiet -avz --ignore-existing "$repo/refs/" "$D/.git/refs/"
  92         ;;
  93 http://*)
  94         echo "Somebody should add http fetch" >&2
  95         exit 1
  96         ;;
  97 *)
  98         cd "$D" && case "$upload_pack" in
  99         '') git-clone-pack $quiet "$repo" ;;
 100         *) git-clone-pack $quiet "$upload_pack" "$repo" ;;
 101         esac
 102         ;;
 103 esac