We would update 'found' using bit operations, but studiously ignore the actual
value and treat it as boolean. So just use a boolean variable instead. Because
there is a double loop, we would break the inner loop, but repeat the outer
loop, even though the boolean was already set. Add '&& !found' in the loop
conditions to break iteration immediately.
We had 'msghdr' and 'mh' in various places. Now 'const struct msghdr msghdr' is
used consistently. With structured init the variable is only used in the call
to sendmsg(), so let's make it a bit more descriptive.
The current pattern '#' triggers on the openSUSE kernel version that is
printed early during boot when no actual prompt is ready
> [ 0.000000] Linux version 5.12.10-1-default (geeko@buildhost) (gcc (SUSE Linux) 11.1.1 20210510 [revision 23855a176609fe8dda6abaf2b21846b4517966eb], GNU ld (GNU Binutils; openSUSE Tumbleweed) 2.36.1.20210326-4) #1 SMP Fri Jun 11 05:05:06 UTC 2021 (b92eaf7)
Instead wait for pattern that: a) should have fewer false positives, b)
still be with working on distro shells:
openSUSE (red color)
^[[1m^[[31mimage:~ #^[[m^O
arch
[root@image ~]#
debian
root@image:~#
ubuntu
root@image:~#
fedora
[root@image ~]#
The current boot test relies on terminal login, therefore network setup
inside image is unnecessary. This opens up possibility to test images
that don't support the network setup via veth devices.
These have ignored the return value forever. Two are public APIs so
we can't really change what they return anyway, and the other one is
a cleanup path and the existing error code is more important.
CID#1461274
CID#1461275
CID#1461276
In general we almost never hit those asserts in production code, so users see
them very rarely, if ever. But either way, we just need something that users
can pass to the developers.
We have quite a few of those asserts, and some have fairly nice messages, but
many are like "WTF?" or "???" or "unexpected something". The error that is
printed includes the file location, and function name. In almost all functions
there's at most one assert, so the function name alone is enough to identify
the failure for a developer. So we don't get much extra from the message, and
we might just as well drop them.
Dropping them makes our code a tiny bit smaller, and most importantly, improves
development experience by making it easy to insert such an assert in the code
without thinking how to phrase the argument.
When copying large directory trees it should be a better idea to sync
the whole fs once when we are done instead of individually for each
file, hence add COPY_SYNCFS.
As opposed to COPY_FSYNC/COPY_FSYNC_FULL this only really applies to the
top-level directory, after completion of the whole copy.
As a safety precaution it makes sense to fsync() files after copying
them, and maybe even the directories they are contained in. Let's add a
flag for these two cases.
let's make sure we only operate on regular files when copying files.
Also, make sure to copy file attributes only over if target is a regular
file (so that copying a file to /dev/null won't alter the access
mode/ownership of that device node...)
(This might not look like a big improvement, but will shortly, when we
add fsync() support to the copy logic, at which point there are more
error paths we can unify that way.)
While we are at it, tweak a clean-up path: only unlink a copied file if
we are definitely the ones who created them, i.e. if O_EXCL is set.
Zbigniew Jędrzejewski-Szmek
Luca Boccassi
Yu Watanabe
Michal Koutný
Egor Ignatov
David Seifert
Lennart Poettering
David Tardon