Unsure when/how that is triggered but oneconf seems to hit that often in
Ubuntu

example

"Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/oneconf/packagesethandler.py",
line 63, in update
    newpkg_list = self.distro.compute_local_packagelist()
  File "/usr/lib/python3/dist-packages/oneconf/distributor/Ubuntu.py",
line 42, in compute_local_packagelist
    with apt.Cache() as apt_cache:
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 113, in __init__
    self.open(progress)
  File "/usr/lib/python3/dist-packages/apt/cache.py", line 166, in open
    self._records = apt_pkg.PackageRecords(self._cache)
SystemError: E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_restricted_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_multiverse_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_universe_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_main_binary-i386_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_restricted_binary-amd64_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_multiverse_binary-amd64_Packages
- open (2: No such file or directory), E:Could not open file
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_wily_universe_binary-amd64_Packages
- open (2: No such file or directory)"

Control: tag -1 unreproducible moreinfo

You're probably opened the cache without holding a lock, and
an update ran in parallel. That's really the only possible
explanation I could think of.

Is there a way to hold a lock as a normal user process? (oneconf is an
user session service)
If not is there a standard way to detect that something is changing the
cache under your feet and to deal with that?

Cheers,
Sebastien Bacher

Use inotify on the cache directory? But in any case, this is problematic
and could probably be fixed by adding some new interfaces to APT (so we
can open fds when opening the cache, and fail if the files are not
present there - and if they are present, pass those fds to the
PackageRecords - this would make things race-free).

I'll look more closely at this later.

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