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So we're able to detect memory leaks in our NSS modules.
An example after introducing a memory leak in nss-myhostname.c:
testsuite-71.sh[2881]: =================================================================
testsuite-71.sh[2881]: ==2880==ERROR: LeakSanitizer: detected memory leaks
testsuite-71.sh[2881]: Direct leak of 2 byte(s) in 1 object(s) allocated from:
testsuite-71.sh[2881]: #0 0x7fa28907243b in strdup (/usr/lib64/libasan.so.8.0.0+0x7243b)
testsuite-71.sh[2881]: #1 0x7fa286a7bc10 in gethostname_full ../src/basic/hostname-util.c:67
testsuite-71.sh[2881]: #2 0x7fa286a74af9 in gethostname_malloc ../src/basic/hostname-util.h:24
testsuite-71.sh[2881]: #3 0x7fa286a756f4 in _nss_myhostname_gethostbyname4_r ../src/nss-myhostname/nss-myhostname.c:79
testsuite-71.sh[2881]: #4 0x7fa288f17588 in getaddrinfo (/lib64/libc.so.6+0xf4588)
testsuite-71.sh[2881]: #5 0x7fa2890a4d93 in __interceptor_getaddrinfo.part.0 (/usr/lib64/libasan.so.8.0.0+0xa4d93)
testsuite-71.sh[2881]: #6 0x55a54b2b7159 in ahosts_keys_int.part.0 (/usr/bin/getent.orig+0x4159)
testsuite-71.sh[2881]: SUMMARY: AddressSanitizer: 2 byte(s) leaked in 1 allocation(s).
Cutting off in the middle may leave the terminal in a bad state, breaking
further output. But we don't know what a given ANSI sequence does, e.g.
ANSI_NORMAL should not be skipped. But it is also nice to keep various
sequences intact, so that if we had part of the string in blue, and we cut out
the beginning of the blue part, we still want to keep the remainder in color.
So let's just pass them through, stripping out the characters that take up
actual space.
Also, use memcpy_safe as we may end up copying zero bytes when ellipsizing at
the start/end of a string.
Fixes: #24502
This also fixes an ugliness where we would ellipsize string with ANSI
sequences too much, leading to output that was narrower on screen than the
requested length:
Starting AAAAAAAAAAAAAAAAAAAAA.service
Starting BBBBBBBBBBBBBBBBBBBBB.service
Starting LONG…ER.service
Co-authored-by: Jan Janssen <medhefgo@web.de>
Let's add a catalog entry, make the log record structured, and most
importantly, let's add warning emojis.
Just to underline that this stuff should really go away.
It just gives names for things generally just handled as numeric
indexes, hence drop the type name, and make the enum anonymous. Nothing
is using the type name anyway.
When resolving environment variables we currently silently resolve unset
and invalid environment variables to empty strings. Let's do this
slightly less silently: log about unset and invalid env vars, but still
resolve them to an empty string.
Fixes: #27036
