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