1. 30 Mar, 2018 1 commit
    • Jeff King's avatar
      add chdir-notify API · 2b5ed373
      Jeff King authored
      If one part of the code does a permanent chdir(), then this
      invalidates any relative paths that may be held by other
      parts of the code. For example, setup_work_tree() moves us
      to the top of the working tree, which may invalidate a
      previously stored relative gitdir.
      We've hacked around this case by teaching setup_work_tree()
      to re-run set_git_dir() with an adjusted path, but this
      stomps all over the idea of module boundaries.
      setup_work_tree() shouldn't have to know all of the places
      that need to be fed an adjusted path. And indeed, there's at
      least one other place (the refs code) which needs adjusting.
      Let's provide an API to let code that stores relative paths
      "subscribe" to updates to the current working directory.
      This means that callers of chdir() don't need to know about
      all subscribers ahead of time; they can simply consult a
      dynamically built list.
      Note that our helper function to reparent relative paths
      uses the simple remove_leading_path(). We could in theory
      use the much smarter relative_path(), but that led to some
      problems as described in 41894ae3 (Use simpler
      relative_path when set_git_dir, 2013-10-14). Since we're
      aiming to replace the setup_work_tree() code here, let's
      follow its lead.
      Signed-off-by: 's avatarJeff King <peff@peff.net>
      Signed-off-by: 's avatarJunio C Hamano <gitster@pobox.com>