bin/git-new-workdir

   1 #!/bin/sh
   2
   3 usage () {
   4         echo "usage:" $@
   5         exit 127
   6 }
   7
   8 die () {
   9         echo $@
  10         exit 128
  11 }
  12
  13 if test $# -lt 2 || test $# -gt 3
  14 then
  15         usage "$0 <repository> <new_workdir> [<branch>]"
  16 fi
  17
  18 orig_git=$1
  19 new_workdir=$2
  20 branch=$3
  21
  22 # want to make sure that what is pointed to has a .git directory ...
  23 git_dir=$(cd "$orig_git" 2>/dev/null &&
  24   git rev-parse --git-dir 2>/dev/null) ||
  25   die "Not a git repository: \"$orig_git\""
  26
  27 case "$git_dir" in
  28 .git)
  29         git_dir="$orig_git/.git"
  30         ;;
  31 .)
  32         git_dir=$orig_git
  33         ;;
  34 esac
  35
  36 # don't link to a configured bare repository
  37 isbare=$(git --git-dir="$git_dir" config --bool --get core.bare)
  38 if test ztrue = z$isbare
  39 then
  40         die "\"$git_dir\" has core.bare set to true," \
  41                 " remove from \"$git_dir/config\" to use $0"
  42 fi
  43
  44 # don't link to a workdir
  45 if test -L "$git_dir/config"
  46 then
  47         die "\"$orig_git\" is a working directory only, please specify" \
  48                 "a complete repository."
  49 fi
  50
  51 # don't recreate a workdir over an existing repository
  52 if test -e "$new_workdir"
  53 then
  54         die "destination directory '$new_workdir' already exists."
  55 fi
  56
  57 # make sure the links use full paths
  58 git_dir=$(cd "$git_dir"; pwd)
  59
  60 # create the workdir
  61 mkdir -p "$new_workdir/.git" || die "unable to create \"$new_workdir\"!"
  62
  63 # create the links to the original repo.  explicitly exclude index, HEAD and
  64 # logs/HEAD from the list since they are purely related to the current working
  65 # directory, and should not be shared.
  66 for x in config refs logs/refs objects info hooks packed-refs remotes rr-cache svn
  67 do
  68         case $x in
  69         */*)
  70                 mkdir -p "$(dirname "$new_workdir/.git/$x")"
  71                 ;;
  72         esac
  73         ln -s "$git_dir/$x" "$new_workdir/.git/$x"
  74 done
  75
  76 # now setup the workdir
  77 cd "$new_workdir"
  78 # copy the HEAD from the original repository as a default branch
  79 cp "$git_dir/HEAD" .git/HEAD
  80 # checkout the branch (either the same as HEAD from the original repository, or
  81 # the one that was asked for)
  82 git checkout -f $branch
  83 if test -n "$branch"
  84 then
  85         git merge --ff-only '@{upstream}'
  86 fi