provide wrapper for borg mount, fixes #743

- add archiver.main_mount()

- provide borgfs behaviour when the monolithic binary is called via a
  symlink called borgfs

- docs: update usage of mount subcommand, provide examples for borgfs and
  add symlink creation to standalone binary installation

- run build_usage

- add entry point in setup.py

- patch helpers.py:get_keys_dir() to allow mounting fstab entries with
  "user" option set

  Without this, setuid() called at some point by mount changes the HOME
  environment variable to '/root' and os.expanduser('~') would return
  '/root' as well, thus the mount would fail with
 	 PermissionError: [Errno 13] Permission denied: '/root/.config'
  After setuid(), the HOME variable stays intact, so we still can
  explicitly query USER's home.

  Also, os.path.expanduser() behaves differently for '~' and '~someuser'
  as parameters: when called with an explicit username, the possibly set
  environment variable HOME is no longer respected. So we have to check if
  it is set and only expand the user's home directory if HOME is unset.

- add myself to AUTHORS

1 files changed, 1 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
index 88a111641..f0a38701c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -8,6 +8,7 @@ Borg Contributors ("The Borg Collective")
 - Michael Hanselmann <public@hansmi.ch>
 - Teemu Toivanen <public@profnetti.fi>
 - Marian Beermann <public@enkore.de>
+- Daniel Reichelt <hacking@nachtgeist.net>
 
 Borg is a fork of Attic.