[tor-bugs] #22283 [Applications/Tor Launcher]: Linux 7.0a4 broken after update: "Directory /run/user/$uid/Tor does not exist."

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#22283: Linux 7.0a4 broken after update: "Directory /run/user/$uid/Tor does not
exist."
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     Reporter:  mcs                        |      Owner:  mcs
         Type:  defect                     |     Status:  new
     Priority:  Medium                     |  Milestone:
    Component:  Applications/Tor Launcher  |    Version:
     Severity:  Normal                     |   Keywords:
Actual Points:                             |  Parent ID:
       Points:                             |   Reviewer:
      Sponsor:                             |
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 After Tor Browser 7.0a3 is updated to 7.0a4 on Linux, it fails to start
 up. The problem is that the code we wrote for #20761 to remove
 `ControlPort` and `SocksPort` lines from the user's torrc only removes
 Unix domain socket lines if the browser is configured to use Unix domain
 sockets, which it is not in 7.0a4. This means that after updating to
 7.0a4, Tor Launcher starts tor so that TCP is used for the control port
 and SOCKS port, but lines like the following are left behind in torrc:
 {{{
 ControlPort unix:/run/user/1001/Tor/control.socket
 SocksPort unix:/run/user/1001/Tor/socks.socket IPv6Traffic PreferIPv6
 KeepAliveIsolateSOCKSAuth
 }}}

 Unfortunately, the parent directory (in this example,
 `/run/user/1001/Tor`) does not exist because Tor Launcher removes it when
 it exits and does not create it because it does not think Unix domain
 sockets are being used.

 A similar problem occurs on OSX, but the parent directory is always
 `.../TorBrowser-Data/Tor` which happens to exist for other reasons (i.e.,
 that's where torrc is located), so on OSX Tor Browser starts up and there
 are both TCP and Unix domain socket listeners.

 One workaround is for users to edit their torrc and remove the
 `ControlPort` and `SocksPort` lines manually.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22283>
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