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basic ruby script not working as expected
def performCommandInDir(command, dir)
  old_dir = Dir.pwd
  Dir.chdir(dir)
  system(command)
  Dir.chdir(old_dir)
end

performCommandInDir("git svn rebase", repo[:name])

fatal: /usr/libexec/git-core/git-rebase cannot be used without a working tree.
rebase refs/remotes/git-svn: command returned error: 1

system("git --git-dir=#{repo[:name]}/.git --work-tree=#{repo[:name]} svn rebase")

def performCommandInDir(command, dir)
  system(command, :chdir => dir)
end

Dir.chdir(dir) do
  # your actions
end
# back in the original directory

def performCommandInDir(command, dir)
    system("cd #{dir} && #{command}")
end