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