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This is a follow-up to https://github.com/systemd/systemd/pull/2493
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Let's add an extra-safety net and change UID/GID to the "systemd-coredump" user when processing coredumps from system
user. For coredumps of normal users we keep the current logic of processing the coredumps from the user id the coredump
was created under.
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=87354
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This reworks the coredumping logic so that the coredump handler invoked from the kernel only collects runtime data
about the crashed process, and then submits it for processing to a socket-activate coredump service, which extracts a
stacktrace and writes the coredump to disk.
This has a number of benefits: the disk IO and stack trace generation may take a substantial amount of resources, and
hence should better be managed by PID 1, so that resource management applies. This patch uses RuntimeMaxSec=, Nice=, OOMScoreAdjust=
and various sandboxing settings to ensure that the coredump handler doesn't take away unbounded resources from normally
priorized processes.
This logic is also nice since this makes sure the coredump processing and storage is delayed correctly until
/var/systemd/coredump is mounted and writable.
Fixes: #2286
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Build sys and man fixes
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Repeating those conditionals for every program is
annoying. Use a helper variable to avoid conditionals.
Also always add generated completion files to CLEANFILES.
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It's better to always include them in 'make clean'.
It is also easier to read Makefile.am when less stuff is conditional.
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This adds a new switch --as-pid2, which allows running commands as PID 2, while a stub init process is run as PID 1.
This is useful in order to run arbitrary commands in a container, as PID1's semantics are different from all other
processes regarding reaping of unknown children or signal handling.
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journalctl: make "journalctl /dev/sda" work
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Currently when journalctl is called with path to block device node we
add following match _KERNEL_DEVICE=b$MAJOR:$MINOR.
That is not sufficient to actually obtain logs about the disk because
dev_printk() kernel helper puts to /dev/kmsg information about the
device in following format, +$SUBSYSTEM:$ADDRESS,
e.g. "+pci:pci:0000:00:14.0".
Now we will walk upward the syspath and add match for every device in
format produced by dev_printk() as well as match for its device node if
it exists.
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Resolved 2
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The command has a man page now and is public, hence add it to /usr/bin.
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Let's make sure our poll() calls don't get interrupted where they shouldn't (SIGALRM, ...), but allow them to be
interrupted where they should (SIGINT, ...).
Fixes #1965
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Ask password unicode fix
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For the search domain logic the order is highly relevant, hence make sure when collecting the various search domains to
add them to an ordered set, so that the order between search domains of a specific link is retained.
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Commit ab6f56debf made the change to allow building man pages even when disabled
with ./configure --disable-manpages. This works fine, as long as xsltproc is
present. If xsltproc is not present, the command to build a man page (obviously)
fails. Unfortnately it fails with a cryptic message '-o not found', because
$(XSLTPROC) is empty. Add a fallback, to use 'xsltproc' is $(XSLTPROC) is not
defined. This way we get a nice message:
make: xsltproc: Command not found
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This way the difference between lookups via NSS and our native bus API should become minimal.
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The tool resolves way more than just hosts, hence give it a more generic name. This should be safe, as the tool is
currently undocumented. Before we add documentation for it, let's get the name right.
This also moves the C source into src/resolve/ (from src/resolve-host/), since the old name is a misnomer now. Also,
since it links directly to many of the C files of resolved it really belongs into resolved's directory anyway.
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Also, while we are at it, set the "authenticated" bit for everything we synthesize
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Nss link less 2
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resolved bus API improvements
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The link objects expose as properties the current settings made with SetLinkDNS() and related calls, plus some more
information.
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Man page grammar and build tweaks v3
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This is purely for developer convenience: building man pages is slow
so people tend to disable them when not working on documentation. But
sometimes it is useful to build the man page to look something up,
especially when working on an older machine which has outdated
documentation, or to test some change to documentation. The rules to build
man pages are now outside of the ENABLE_MANPAGES conditional, but they
are not used unless manually invoked, and only the inclusion of man
pages in build and install targets is affected by the conditional.
Also, more generated files are removed in clean, which seems to be
good thing, and Makefile.am is simplified.
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This new test case tries to resolve a couple of known domains, to verify the validation results. It talks to resolved
via the bus, thus comprehensively testing the whole shebang.
Of course, it requires network connectivity and a DNSSEC capable DNS server, hence this is a manual test.
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build-sys: regenerate %.m4 -> % on reconfigure
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The hash operations are not really that specific to hashmaps, hence split them into a .c module of their own.
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Twelfth DNSSEC PR
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networkd previously knew an enum "ResolveSupport" for configuring
per-interface LLMNR support, resolved had a similar enum just called
"Support", with the same value and similar pasers.
Unify this, call the enum ResolveSupport, and port both daemons to it.
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Fixes:
```
$ make valgrind-tests TESTS=test-acl-util
GEN valgrind-tests
Running test-acl-util
/bin/bash: line 4: libtool: command not found
```
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Fixes:
$ ./configure ... --disable-tests
$ make
$ sudo make check
FAIL: test/udev-test.pl
PASS: test/rule-syntax-check.py
PASS: test/sysv-generator-test.py
...
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The current code is not compatible with current dkr protocols anyway,
and dkr has a different focus ("microservices") than nspawn anyway
("whole machine containers"), hence drop support for it, we cannot
reasonably keep this up to date, and it creates the impression we'd
actually care for the microservices usecase.
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build: fix systemd-journal-upload installation
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