the conversion procedure is simple:
- find all things that look like options, ie calls to either `mkOption`
or `lib.mkOption` that take an attrset. remember the attrset as the
option
- for all options, find a `description` attribute who's value is not a
call to `mdDoc` or `lib.mdDoc`
- textually convert the entire value of the attribute to MD with a few
simple regexes (the set from mdize-module.sh)
- if the change produced a change in the manual output, discard
- if the change kept the manual unchanged, add some text to the
description to make sure we've actually found an option. if the
manual changes this time, keep the converted description
this procedure converts 80% of nixos options to markdown. around 2000
options remain to be inspected, but most of those fail the "does not
change the manual output check": currently the MD conversion process
does not faithfully convert docbook tags like <code> and <package>, so
any option using such tags will not be converted at all.
The module option type `nonEmptyStr` was introduced in commit
a3c5f0cba8
The tsm modules previously simply used
`strMatching ".+"` to prevent empty option strings,
but the new type is more thorough as
it also catches space-only strings.
This enables some systemd sandboxing
options for the `tsm-backup.service`.
Those settings have been determined by expermentation.
This commit tries hard to protect the filesystem from
write access, but not to hide anything from read access,
so users can backup all files they choose to backup.
An exception are API filesystems (`/dev`, `/proc`, `/sys`):
As their "files" are not stored on persistent storage,
they are sandboxed away as much as possible.
Note that the service still has to run with root
privileges to reach files with limited access permissions.
The obvious alternative to use a dedicated user account and
the `CAP_DAC_READ_SEARCH` capability to permit system-wide
read access while blocking write access does not work.
Experiments have shown that `dsmc` verifies access permissions
for each file before attempting to open it for reading.
Hence `dsmc` refuses to copy files where the file permission
mode blocks read access -- even if process capabilities
would allow it to proceed irrespective of permissions.
