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Let's always escape strings we receive from the user before writing them
out to unit file settings that suppor specifier expansion, so that user
strings are transported as-is.
Using specifiers in these settings isn't particularly useful by itself,
but it unifies behaviour a bit. It's kinda surprising that What= in
mount units resolves specifies, but Where= does not. Hence let's add
that too. Also, it's surprising Where=/What= in mount units behaves
differently than in automount and swap units, hence resolve specifiers
there too. Then, Type= in mount units is nowadays an arbitrary,
sometimes non-trivial string (think fuse!), hence let's also expand
specifiers there, to match the rest of the mount settings.
This has the benefit that when writing code that generates unit files,
less care has to be taken to check whether escaping of specifiers is
necessary or not: broadly everything that takes arbitrary user strings
now does specifier expansion, while enums/numerics/booleans do not.
We process C-style escapes in Environment=, hence we should process it
in UnsetEnvironment= too, as the latter accepts assignments much like
the former, including arbitrary values specified by the user.
All other cases where we accept a reboot argument are decoded with
config_parse_unit_string_printf() rather than
config_parse_unit_path_printf(), and that's really the only thing what
makes sense here, hence adjust this here, too.
The code in install-printf.c and unit-printf.c for these is pretty much
the same and very generic. Let's move this all over to the generic
specifier.c, and share the implementations.
Specifier expansion (much like C escape handling) should be a helper for
writing unit files, but should be nothing we do on programatic APIs. For
those, the client can do the necessary replacements anyway, and we
really should be careful with doing such string processing of data we
get via lower level programmatic APIs.
We currently do specifier expansion only for the env var transient unit
APIs, no other properties do this. Let's remove it here too, to be fully
systematic.
Yes, in a way this is API breakage, but then again this API isn't
documented yet, and an outlier, hence let's clear this up now, before it
is too late.
Coverity says that's undefined. I'm pretty sure we always would get a nan, but
let's avoid (formally) undefined behaviour since that can cause compilers to do
strange things.
read_one_line_file() always returns <= 0, so the code was OK, but let's write
the check a bit differently to make it obvious that min_max is always set.
The comment above makes the intent of the code pretty clear:
"use security2_protocol == NULL as indicator".
So revert the condition in the check and fix the logic in the comment while
at it.
The question is how this could have ever worked: if BS->LocateProtocol
(which is supposedly optional) ever failed, we'd crash here. Strange.
Found by coverity.
m->encrypted is set when fstype=="crypto_LUKS", but this is not obvious when
reading decrypt_partition(). Just check if passphrase is set before using
it.
