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This will be useful when building distro packages, because we can set the
version string to the rpm/dpkg/whatever version string, and getter reports
from end users.
$ build/systemctl --version
systemd 239-3555-g6178cbb5b5
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN +PCRE2 default-hierarchy=hybrid
$ git tag v240 -m 'v240'
$ ninja -C build
ninja: Entering directory `build'
[76/76] Linking target fuzz-unit-file.
$ build/systemctl --version
systemd 240
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN +PCRE2 default-hierarchy=hybrid
This is very useful during development, because a precise version string is
embedded in the build product and displayed during boot, so we don't have to
guess answers for questions like "did I just boot the latest version or the one
from before?".
This change creates an overhead for "noop" builds. On my laptop, 'ninja -C
build' that does nothing goes from 0.1 to 0.5 s. It would be nice to avoid
this, but I think that <1 s is still acceptable.
Fixes#7183.
PACKAGE_VERSION is renamed to GIT_VERSION, to make it obvious that this is the
more dynamically changing version string.
Why save to a file? It would be easy to generate the version tag using
run_command(), but we want to go through a file so that stuff gets rebuilt when
this file changes. If we just defined an variable in meson, ninja wouldn't know
it needs to rebuild things.
PROJECT_VERSION is used in preparation for future changes. Let's simplify the
code by using structured initialization. If the string written to .version ever
became to long, the compiler will truncate it and tell us:
../src/udev/udev-ctrl.c: In function ‘ctrl_send’:
../src/udev/udev-ctrl.c:221:28: warning: initializer-string for array of chars is too long
.version = "udev-" STRINGIFY(R_VERSION),
^~~~~~~
../src/udev/udev-ctrl.c:221:28: note: (near initialization for ‘ctrl_msg_wire.version’)
No functional change.
Let's not use atoi() if we can simply provide the project version as a number.
In C code, this is the numerical project version. In substitutions in other
files, this is just the bare substitution.
The "PACKAGE_" prefix is from autotools, and is strange. We call systemd a
"project", and "package" is something that distros build. Let's rename.
PACKAGE_URL is renamed to PROJECT_URL for the same reasons and for consistency.
(This leave PACKAGE_VERSION as the stringified define for C code.)
PACKAGE_VERSION is more explicit, and also, we don't pretend that changing the
project name in meson.build has any real effect. "systemd" is embedded in a
thousand different places, so let's just use the hardcoded string consistently.
This is mostly in preparation for future changes.
The starting of mount units requires that changes to
/proc/self/mountinfo be processed before the SIGCHILD from the
completion of /sbin/mount is processed, as described by the comment
/* Note that due to the io event priority logic, we can be sure the new mountinfo is loaded
* before we process the SIGCHLD for the mount command. */
The recently-added mount-storm protection can defeat this as it
will sometimes deliberately delay processing of /proc/self/mountinfo.
So we need to disable mount-storm protection when a mount unit is starting.
We do this by keeping a counter of the number of pending
mounts, and disabling the protection when this is non-zero.
Thanks to @asavah for finding and reporting this problem.
Apparently this originated in PHP, so the json output could be directly
embedded in HTML script tags.
See https://stackoverflow.com/questions/1580647/json-why-are-forward-slashes-escaped.
Since the output of our tools is not intended directly for web page generation,
let's not do this unescaping. If needed, the consumer can always do escaping as
appropriate for the target format.
read_line() is a lot more careful and optimized than read_nul_string()
but does mostly the same thing. let's replace the latter by the former,
just with a special flag that toggles between the slightly different EOL
rules if both.
Previously, setting this option by default was problematic due to
SELinux (as this would also prohibit the transition from PID1's label to
the service's label). However, this restriction has since been lifted,
hence let's start making use of this universally in our services.
On SELinux system this change should be synchronized with a policy
update that ensures that NNP-ful transitions from init_t to service
labels is permitted.
Fixes: #1219
This reverts commit 3ca9940cb9.
Let's split the commit in two: the sorting and the changes.
Because there's a requirement to update selinux policy, this change is
incompatible, strictly speaking. I expect that distributions might want to
revert this particular change. Let's make it easy.
_c is misleading because .h files should be included in those lists too
(this tells meson that the build outputs should be rebuilt if the header
files change).
Follow-up for 1437822638.
The point here is to compare speed of hashmap_destroy with free and a different
freeing function, to the implementation details of hashmap_clear can be
evaluated.
Results:
current code:
/* test_hashmap_free (slow, 1048576 entries) */
string_hash_ops test took 2.494499s
custom_free_hash_ops test took 2.640449s
string_hash_ops test took 2.287734s
custom_free_hash_ops test took 2.557632s
string_hash_ops test took 2.299791s
custom_free_hash_ops test took 2.586975s
string_hash_ops test took 2.314099s
custom_free_hash_ops test took 2.589327s
string_hash_ops test took 2.319137s
custom_free_hash_ops test took 2.584038s
code with a patch which restores the "fast path" using:
for (idx = skip_free_buckets(h, 0); idx != IDX_NIL; idx = skip_free_buckets(h, idx + 1))
in the case where both free_key and free_value are either free or NULL:
/* test_hashmap_free (slow, 1048576 entries) */
string_hash_ops test took 2.347013s
custom_free_hash_ops test took 2.585104s
string_hash_ops test took 2.311583s
custom_free_hash_ops test took 2.578388s
string_hash_ops test took 2.283658s
custom_free_hash_ops test took 2.621675s
string_hash_ops test took 2.334675s
custom_free_hash_ops test took 2.601568s
So the test is noisy, but there clearly is no significant difference with the
"fast path" restored. I'm surprised by this, but it shows that the current
"safe" implementation does not cause a performance loss.
When the code is compiled with optimization, those times are significantly
lower (e.g. 1.1s and 1.4s), but again, there is no difference with the "fast
path" restored.
The difference between string_hash_ops and custom_free_hash_ops is the
additional cost of global modification and the extra function call.
In particular, check that the order of the results is consistent.
This test coverage will be useful in order to refactor the compare_func
used while sorting the results.
When introduced, this test also uncovered a memory leak in sd_lldp_stop(),
which was then fixed by a separate commit using a specialized function
as destructor of the LLDP Hashmap.
Tested:
$ ninja -C build/ test
$ valgrind --leak-check=full build/test-lldp
Let's first remove an item from the hashmap and only then destroy it.
This makes sure that destructor functions can mdoify the hashtables in
their own codee and we won't be confused by that.
There's no value in authenticating SOA RRs that are neither answer to
our question nor parent of our question (the latter being relevant so
that we have a TTL from the SOA field for negative caching of the actual
query).
By being to eager here, and trying to authenticate too much we run the
risk of creating cyclic deps between our transactions which then causes
the over-all authentication to fail.
Fixes: #9771
