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[Michael Vogt <michael.vogt@xxxxxxxxxxxxx>]

** Also affects: snap-confine (Ubuntu Xenial)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1606277

Title:
  log-observe interface is broken in latest snap-confine

Status in Snappy Launcher:
  Fix Released
Status in snap-confine package in Ubuntu:
  New
Status in snap-confine source package in Xenial:
  New

Bug description:
  The log-observe interface is broken due to how we handle bind mounts
  now. This can be seen with 'snappy-debug':

  $ sudo snap install snappy-debug
  $ sudo snap connect snappy-debug:log-observe ubuntu-core:log-observe
  $ sudo /snap/bin/snappy-debug.security scanlog
  kernel.printk_ratelimit = 0
  Traceback (most recent call last):
    File "/snap/snappy-debug/22/bin/snappy-security-scanlog", line 580, in <module>
      sys.exit(main())
    File "/snap/snappy-debug/22/bin/snappy-security-scanlog", line 569, in main
      from_end=opt.only_new)
    File "/snap/snappy-debug/22/bin/snappy-security-scanlog", line 92, in __init__
      self.scan_log(log_file, snap_name, follow, from_end)
    File "/snap/snappy-debug/22/bin/snappy-security-scanlog", line 157, in scan_log
      log = open_file_read(log_file)
    File "/snap/snappy-debug/22/bin/snappy-security-scanlog", line 71, in open_file_read
      orig = codecs.open(path, 'r', "UTF-8", errors="replace")
    File "/usr/lib/python3.5/codecs.py", line 895, in open
      file = builtins.open(filename, mode, buffering)
  FileNotFoundError: [Errno 2] No such file or directory: '/var/log/syslog'

  This is because /var/log/syslog is not available at runtime due to the bind mounts. This can be shown by installing hello-world, adjusting /var/lib/snapd/apparmor/profiles/snap.hello-world.sh to have "/**/ r," (to be able to read any directory), reloading the profile, then doing:
  $ hello-world.sh
  ...
  bash-4.3$ ls /var/log/
  alternatives.log  btmp	 dpkg.log  fsck     watchdog
  bootstrap.log	  dmesg  faillog   lastlog  wtmp

  This may also be a problem with other interfaces, I haven't checked
  extensively, though it seems that /var/lib/extrausers (from the
  nameservice abstraction) won't work right, and (at least) ppp
  (/var/log/ppp) and timezone-control (/usr/share/zoneinfo) are also
  affected.

  WORKAROUND for snappy-debug: launch outside of the launcher:
  $ sudo SNAP=/snap/snappy-debug/current PATH=$PATH:/snap/snappy-debug/current/bin /snap/snappy-debug/current/bin/snappy-security scanlog

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