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

[Rafael David Tinoco]

Based on case history, to fully address this to all still supported
Ubuntu releases:

 autofs | 5.1.2-1ubuntu3   | bionic          |
 autofs | 5.1.2-1ubuntu3.1 | bionic-updates  |
 autofs | 5.1.2-4ubuntu2   | disco           |
 autofs | 5.1.5-1ubuntu1   | eoan            |
 autofs | 5.1.6-2          | focal           |

we need (possibly):

Ubuntu Bionic:

ef48867 autofs-5.1.2 - increase worker thread per-thread stack size
95dafa1 autofs-5.1.2 - fix offset mount location multiple expansion
2d8d7d0 autofs-5.1.2 - use malloc for expanded map location

Ubuntu Eoan:

a change to /etc/auto.smb

Ubuntu Focal:

a change to /etc/auto.smb

I have done the Bionic SRU merge attempt:

https://code.launchpad.net/~rafaeldtinoco/ubuntu/+source/autofs/+git/autofs/+merge/382338

and asked @ahasenack to review it.

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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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