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asprintf(3) says that the pointer is "undefined" after a failed call.
In the current glibc implementation it is just NULL. In principle the
call could return a valid pointer with bad contents or something.
We have two styles of error handling: in a majority of cases we would
check the return value, but sometimes we used (void) and relied on the
pointer not being set. In practice both styles should be equivalent,
but gcc doesn't like the second one with -Wunused-result. (Though only
sometimes. E.g. on my F34 box I don't get the same warnings as in CI,
even though the compiler version is very similar and the compilation
options are the same…). It's also nice to be consistent in our code base.
So let's always use the first style of error checking.
We disabled it in f73fb7b742 in response to an
apparent gcc bug. It seems that depending on the combination of optimization
options, gcc still ignores (void). But this seems to work fine with clang, so
let's re-enable the warning conditionally.
When those two macros were used together in CONST_MAX(), gcc would complain
about a type mismatch. So either DECIMAL_STR_MAX() should be made size_t like
STRLEN(), or STRLEN() be made unsigned.
Since those macros are only usable on arguments of (small) fixed size, any type
should be fine (even char would work…). For buffer size specifications, both
size_t and unsigned are OK. But unsigned was used for DECIMAL_STR_MAX macros
and FORMAT_foo_MAX macros, making STRLEN the only exception, so let's adjust
STRLEN() to be unsigned too.
Also: I don't think this is currently used anywhere, but if any of those macros
were used as an argument to sprintf, size_t would require a cast. ("%*s"
requires an int/unsigned argument.)
It seems to, but I was a bit incredulous… The comment is adjusted to match
the standard.
The trick with a temporary buffer is neat. I wasn't sure if it is valid, but
the standard says so. The test really tests that we are reading the rules right
and that the compiler doesn't do anythign strange or emit an unexpected
warning.
This improves error output in repart if we can't fit the defined
partitions into the disk image. With this change we'll now show not only
the disk size we need (as before), but also the current one, as well as
the largest free area on disk.
This should make it a bit easier to debug disk space issues that repart
runs into.
If the auto-discovered swap partition is LUKS encrypted, decrypt it
automatically.
This aligns with the Discoverable Partitions Specification, though I've
also updated it to explicitly mention that LUKS is now supported here.
Since systemd retries any key already in the kernel keyring, if the swap
partition has the same passphrase as the root partition, the user won't
be prompted a second time for a second passphrase.
See https://github.com/systemd/systemd/issues/20019
For some reason I first commited
a73b2ad041 and then
8f47e32a3e. But the latter makes the
former obsolete and causes us to suffix paths twice.
Let's hence revert a73b2ad041 and stick to
8f47e32a3e as the latter is the ore
generic solution of the two.
