[Bug 1680224] Re: auto.smb fails on Windows administrative shares

[Andreas Hasenack]

To simplify testing next time, these are the configs I used:

smb.conf shares:
[myshare]
        path = /myshare
        read only = no
        guest ok = no

[C$]
        comment = test for windows administrative share
        path = /c
        read only = no
        guest ok = no

/etc/auto.master extra line:
/cifs /etc/auto.smb --timeout=300

Extra packages to install: samba smbclient cifs-utils

Then just navigate to /cifs/<hostname>/.

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https://bugs.launchpad.net/bugs/1680224

Title:
  auto.smb fails on Windows administrative shares

Status in autofs package in Ubuntu:
  Confirmed
Status in autofs source package in Bionic:
  Confirmed
Status in autofs source package in Eoan:
  Confirmed

Bug description:
  This is probably related to #385244.

  I've been unable to get a Windows administrative share (ie. C$)
  mounted through Autofs. Non-administrative shares work fine.
  Administrative shares are accessible with the same credentials from
  other Windows 10 workstations and through smbclient on Ubuntu (16.04
  LTS) machines. Administrative shares can even be mounted using the
  same credentials via mount on the command-line. However, autofs will
  not mount the same shares, using the same credentials, on the same
  Ubuntu machine.

  Administrative shares are listed under /cifs/WindowsHostName, but a cd
  /cifs/WindowsHostname/C$ results in "-bash: cd: C$: No such file or
  directory" from the shell and the following output from 'automount -f
  -v':

  -----
  attempting to mount entry /cifs/WindowsHostname/C$
  >> Retrying with upper case share name
  >> mount error(6): No such device or address
  >> Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)
  mount(generic): failed to mount //WindowsHostname/C\$ (type cifs) on /cifs/WindowsHostname/C$
  failed to mount /cifs/WindowsHostname/C$
  -----

  Notice that mount complains of failing to mount 'C\$' rather than
  'C$'. If the bit of awk script that escapes the $ is removed, it then
  fails to mount 'C', which is also no good. I think if we could
  actually get mount to try to mount 'C$', it would work.

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