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We were ignoring failures from unhexchar, which meant that invalid
hex characters were being turned into garbage rather than the string
rejected.
Fix this by making unhexmem return an error code, also change the API
slightly, to return the size of the returned memory, reflecting the
fact that the memory is a binary blob,and not a string.
For convenience, still append a trailing NULL byte to the returned
memory (not included in the returned size), allowing callers to
treat it as a string without doing a second copy.
Merge write_string_file(), write_string_file_no_create() and
write_string_file_atomic() into write_string_file() and provide a flags mask
that allows combinations of atomic writing, newline appending and automatic
file creation. Change all users accordingly.
The test-barrier binary uses real-time alarms and timeouts to test for
races in the thread-barrier implementation. Hence, if your system is under
high load and your scheduler decides to not run test-barrier for
>BASE_TIME, then the tests are likely to fail.
Two options:
1) Increase BASE_TIME. This will make the test take significantly longer
for no real good. Furthermore, it is still not guaranteed that the
task is scheduled.
2) Don't rely on real-time timers, but use explicit synchronization. This
would basically test one barrier implementation with another.. kinda
ironic.. but maybe something worth looking into.
3) Disable test-barrier by default.
This patch chooses option 3) and makes sure test-barrier only runs if you
pass any argument.
Side note:
test-barrier is written in a way that if it fails under load, but
does not on idle systems, then it is very _unlikely_ that the
barrier implementation is the culprit. Hence, it makes little
sense to run it under load, anyway. It will not improve the test
coverage of barrier.c, but rather the coverage of the test itself.
This is consistent with how an empty string works in an ExecStart=
statement. We should not differentiate between an empty string and
whitespace only (since they look the same.)
Update the test case with whitespace only to reflect that the list is
reset.
Tested that `test-unit-file` passes and other test cases are not
affected. Installed the patched systemd binaries on a machine, booted
it, looked for out of the usual behavior but did not find any.
Convert config_parse_exec() from using FOREACH_WORD_QUOTED into a loop
of unquote_first_word.
Loop through the arguments only once (the FOREACH_WORD_QUOTED
implementation did it twice, once to count them and another time to
process and store them.)
Use newly introduced flag UNQUOTE_UNESCAPE_RELAX to preserve
unrecognized escape sequences such as regexps matches such as "\w",
"\d", etc. (Valid escape sequences such as "\s" or "\b" still need an
extra backslash if literals are desired for regexps.)
Differences in behavior:
- Handle ; (command separator) in special, so that only ; on its own is
valid for that purpose, an quoted semicolon ";" or ';' will now behave
as a literal semicolon. This is probably what was initially intended.
- Handle \; (to introduce a literal semicolon) in special, so that only \;
is turned into a semicolon but not \\; or "\\;" or "\;" which are kept
as a literal \; in the output. This is probably what was initially
intended.
Known issues:
- Using an empty string (for example, ExecStartPre=<empty>) will empty
the list and remove the existing commands, but using whitespace only
(for example, ExecStartPre=<spaces>) will not. This is a pre-existing
issue and will be dealt with in a follow up commit.
Tested:
- Unit tests passing. Also `make distcheck` still works as expected.
- Installed it on a local machine and booted with it, checked console
output, systemctl and journalctl output, did not notice any issues
running the patched systemd binaries.
Relevant bug: https://bugs.freedesktop.org/show_bug.cgi?id=90794
These tests will be useful to check the cases regarding quoted and
escaped semicolon when we switch to using unquote_first_word.
Additionally, convert some of the tests that have semicolons so that the
argument after the semicolon looks like a path (starts with /) so that
we can see the change of behavior when making config_parse_exec more
strict about what it accepts as a command separator.
It will try to unquot_first_word, but if it runs into escaping problems
it will retry it adding UNQUOTE_CUNESCAPE_RELAX to the flags. If it
succeeds on the second try, it will log a warning about it. If it fails
both times, it will log an error.
Add test cases to confirm it behaves as expected.
The new flag UNQUOTE_UNESCAPE_RELAX preserves unrecognized escape
sequences verbatim in unquote_first_word, either when it's a trailing
backslash (similar to UNQUOTE_RELAX, but in this case keep the extra
backslash in the output) or in the middle of a sequence string.
Add unit test cases to ensure the new flag works as expected and to
prevent regressions from being introduced.
Tested with a follow up commit converting config_parse_exec() to start
using unquote_first_word, in which case this flags makes it possible to
preserve unrecognized escape sequences.
Relevant bug: https://bugs.freedesktop.org/show_bug.cgi?id=90794
This ports a lot of manual code over to sigprocmask_many() and friends.
Also, we now consistly check for sigprocmask() failures with
assert_se(), since the call cannot realistically fail unless there's a
programming error.
Also encloses a few sd_event_add_signal() calls with (void) when we
ignore the return values for it knowingly.
This adds a "char *extra" parameter to tempfn_xxxxxx(), tempfn_random(),
tempfn_ranomd_child(). If non-NULL this string is included in the middle
of the newly created file name. This is useful for being able to
distuingish the kind of temporary file when we see one.
This also adds tests for the three call.
For now, we don't make use of this at all, but port all users over.
Currently, the HASHMAP iterators stop at the first NULL entry in a
hashmap. This is non-obvious and breaks users like sd-device, which
legitimately store NULL values in a hashmap.
Fix all the iterators by taking a pointer to the value storage, instead of
returning it. The iterators now return a boolean that tells whether the
end of the list was reached.
Current users of HASHMAP_FOREACH() are *NOT* changed to explicitly check
for NULL. If it turns out, there were users that inserted NULL into
hashmaps, but didn't properly check for it during iteration, then we
really want to find those and fix them.
The result of unit_get_sibling_mask returns bits for the sibling cgroups
even if they are not supported in the local system.
I caught this on a machine where my kernel was misconfigured with
CONFIG_MEMCG unset, but the rest of the cgroup infrastructure enabled.
Tested with `make check` on a host running a kernel where CONFIG_MEMCG
is not set.
When we have a structure like this:
/bin -> /usr/bin
/usr is a mount point
Then path_is_mount_point("/bin", AT_SYMLINK_FOLLOW) needs to look at the pair
/usr/bin and /usr, not at the pair / and /usr/bin, as the latter have different
mount IDs. But we only want to consider the base name, not any parent.
Thus we have to resolve the given path first to get the real parent when
allowing symlinks.
Bug: https://github.com/systemd/systemd/issues/61
Fix a regression caused by 4034a06d ("util: rework word parsing and c
unescaping code") which broke octal escape sequences.
The reason for this breakage is that cunescape_one() expects 4 characters
in an octal encoding, which is a stray left-over from the old code which
operated on different variables to make the length check.
While at it, add a test case to prevent the same thing from happening
again.
We used to block all signals, and restore the original signal mask before exec'ing
external processes.
Now we just block the signals we care about and unconditionally unblock all signals
before exec'ing.
In cgtop,mount-setup,nspawn the name= prefix is hard-coded in the
mount options, and the define is not used.
Everywhere else, we explicitly white-list allow 'name=' prefix to be
used with all controllers, and strip it out to 'normalise' the
controller name. That work is mostly inflicted on us due to 'name='
prefix in the define. Dropping this prefix makes everything more sane
overall.
This allows us to drop the special sigterm handling in spawn_wait()
as this will now be passed directly to the worker event loop.
We now log failing spawend processes at 'warning' level, and timeouts
are in terms of CLOCK_BOOTTIME when available, otherwise the behavior
is unchanged.
Commits 27cc6f166 and f25afeb broke path_is_mount_point() for files (such as
/etc/machine-id → /run/machine-id bind mounts) as with the factorization of
fd_is_mount_point() we lost the parent directory. We cannot determine that from
an fd only as openat(fd, "..") only works for directory fds.
Change fd_is_mount_point() to behave like openat(): It now takes a file
descriptor of the containing directory, a file name in it, and flags (which can
be 0 or AT_SYMLINK_FOLLOW). Unlike name_to_handle_at() or openat(), fstatat()
only accepts the inverse flag AT_SYMLINK_NOFOLLOW and complains with EINVAL
about AT_SYMLINK_FOLLOW; so we need to transform the flags for that fallback.
Adjust rm_rf_children() accordingly (only other caller of fd_is_mount_point()
aside from path_is_mount_point()).
Add test cases for files, links, and file bind mounts (the latter will only
work when running as root). Split out a new test_path_is_mount_point() test
case function as it got significantly larger now.
The hostname(1) tool allows comments in /etc/hostname. Introduce a new
read_hostname_config() in hostname-util which reads a hostname configuration
file like /etc/hostname, strips out comments, whitespace, and cleans the
hostname. Use it in hostname-setup.c and hostnamed and remove duplicated code.
Update hostname manpage. Add tests.
https://launchpad.net/bugs/1053048
When a service is chrooted with the option RootDirectory=/opt/..., then
the options PrivateDevices, PrivateTmp, ProtectHome, ProtectSystem must
mount the directories under $RootDirectory/{dev,tmp,home,usr,boot}.
The test-ns tool can test setup_namespace() with and without chroot:
$ sudo TEST_NS_PROJECTS=/home/lennart/projects ./test-ns
$ sudo TEST_NS_CHROOT=/home/alban/debian-tree TEST_NS_PROJECTS=/home/alban/debian-tree/home/alban/Documents ./test-ns
An Exec*= line with whitespace after modifiers, like
ExecStart=- /bin/true
is considered to have an empty command path. This is as specified, but causes
systemd to crash with
Assertion 'skip < l' failed at ../src/core/load-fragment.c:607, function config_parse_exec(). Aborting.
Aborted (core dumped)
Fix this by logging an error instead and ignoring the invalid line.
Add corresponding test cases. Also add a test case for a completely empty value
which resets the command list.
https://launchpad.net/bugs/1454173
So far a number of utilities implemented their own calls for this, unify
them in prefix_root() and prefix_roota(). The former uses heap memory,
the latter allocates from the stack via alloca().
Port over most users of a --root= logic.
All other types exported from install.h should be namespaces like this,
hence namespace InstallInfo the same way.
Also, remove external forward definition of UnitFileScope type.
It's primarily just a property of the Manager object after all, and we
try to refer to PID 1 as "manager" instead of "systemd", hence let's to
stick to this here too.
A variety of changes:
- Make sure all our calls distuingish OOM from other errors if OOM is
not the only error possible.
- Be much stricter when parsing escaped paths, do not accept trailing or
leading escaped slashes.
- Change unit validation to take a bit mask for allowing plain names,
instance names or template names or an combination thereof.
- Refuse manipulating invalid unit name
Various cleanups, be stricter when parsing unit paths.
Most importantly: return the root slice "-.slice" when asked for slice
of paths that contain no slice component.
A number of fields do not apply to all processes, including: there a
processes without a controlling tty, without parent process, without
service, user services or session. To distuingish these cases from the
case where we simply don't have the data, always return ENXIO for them,
while returning ENODATA for the case where we really lack the
information.
Also update the credentials dumping code to show this properly. Fields
that are known but do not apply are now shown as "n/a".
Note that this also changes some of the calls in process-util.c and
cgroup-util.c to return ENXIO for these cases.
When parsing a unit with a trailing slash after an escaped line break, like
ExecStart=/bin/echo 'foo \
bar'
the split() function (through config_parse()) asserted and crashed pid 1:
Assertion 'current[*l + 1] == quotechars[0]' failed at ../src/shared/util.c:583, function split(). Aborting.
Fix this by returning an error in this case ("trailing garbage").
Add corresponding test case. Also fix the missing "unit" argument of
config_parse_exec() in the comment.
https://launchpad.net/bugs/1447243
If necessary the passed string is enclosed in "", and all special
characters escapes.
This also ports over usage in bus-util.c and job.c to use this, instead
of a incorrect local implementation that forgets to properly escape.
Change cunescape() to return a normal error code, so that we can
distuingish OOM errors from parse errors.
This also adds a flags parameter to control whether "relaxed" or normal
parsing shall be done. If set no parse failures are generated, and the
only reason why cunescape() can fail is OOM.
like:
src/shared/install.c: In function ‘unit_file_lookup_state’:
src/shared/install.c:1861:16: warning: ‘r’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
return r < 0 ? r : state;
^
src/shared/install.c:1796:13: note: ‘r’ was declared here
int r;
^
When parsing words from input files, optionally automatically unescape
the passed strings, controllable via a new flags parameter.
Make use of this in tmpfiles, and port everything else over, too.
This improves parsing quite a bit, since we no longer have to process the
same string multiple times with different calls, where an earlier call
might corrupt the input for a later call.
The error code is called EDEADLK, stop using legacy names like EDEADLOCK.
Note that _some_ weird architectures define them differently (namely, mips
and sparc), but on all sane architectures they're exactly the same. So
stay with the widely used code, which is EDEADLK.
gcc5 spits out a warning about test-hashmap.c:
CC src/test/test-hashmap.o
src/test/test-hashmap.c: In function ‘test_string_compare_func’:
src/test/test-hashmap.c:76:79: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses]
This patch removes includes that are not used. The removals were found with
include-what-you-use which checks if any of the symbols from a header is
in use.
It ran either skip_session() or skip_user_manager(), then ran skip_slices()
iff skip_session() ran. It needs to run skip_slices() in either case.
Included is a test case demonstrating why.
After all it is now much more like strjoin() than strappend(). At the
same time, add support for NULL sentinels, even if they are normally not
necessary.
