tree-wide: remove Emacs lines from all files This should be handled fine now by .dir-locals.el, so need to carry that stuff in every file.

defs: rework CONF_DIRS_NULSTR() macro The macro is generically useful for putting together search paths, hence let's make it truly generic, by dropping the implicit ".d" appending it does, and leave that to the caller. Also rename it from CONF_DIRS_NULSTR() to CONF_PATHS_NULSTR(), since it's not strictly about dirs that way, but any kind of file system path. Also, mark CONF_DIR_SPLIT_USR() as internal macro by renaming it to _CONF_PATHS_SPLIT_USR() so that the leading underscore indicates that it's internal.

treewide: apply errno.cocci with small manual cleanups for style.

util-lib: move CONF_DIRS_NULSTR definition to def.h After all, this is not some compiler or C magic, but something very specific to how systemd works, hence let's move it into def.h, and out of macro.h

util-lib: split out fd-related operations into fd-util.[ch] There are more than enough to deserve their own .c file, hence move them over.

util-lib: split our string related calls from util.[ch] into its own file string-util.[ch] There are more than enough calls doing string manipulations to deserve its own files, hence do something about it. This patch also sorts the #include blocks of all files that needed to be updated, according to the sorting suggestions from CODING_STYLE. Since pretty much every file needs our string manipulation functions this effectively means that most files have sorted #include blocks now. Also touches a few unrelated include files.

util: introduce common version() implementation and use it everywhere This also allows us to drop build.h from a ton of files, hence do so. Since we touched the #includes of those files, let's order them properly according to CODING_STYLE.

sysctl: reword warning message a bit Let's make this less dramatic, in order to not confuse people too much making them think that this was something to actually fix.

sysctl: bump loglevel when attempting to write invalid values

sysctl: don't propagate ENOENT sysctl options We shouldn't fail the sysctl service if an option is missing. Previously the warning about this was already downgraded to LOG_DEBUG, but we really shouldn't propagate such errors either.

sysctl: tweak debug message

sysctl: move property handling to shared/

sysctl: downgrade message about sysctl overrides to debug Printing it at info level was tedious. We don't do that for any other overrides.

sysctl: consider --prefix while parsing the files not while applying the parsed sysctl values. Otherwise info "Overwriting earlier assignment of %s in file %s" is visible many times even though the given --prefix doesn't try to set the overridden value. This also optimizes the startup tiny bit since we have udev rules running on network devices and setting sysctl through the rules.

treewide: use log_*_errno whenever %m is in the format string If the format string contains %m, clearly errno must have a meaningful value, so we might as well use log_*_errno to have ERRNO= logged. Using: find . -name '*.[ch]' | xargs sed -r -i -e \ 's/log_(debug|info|notice|warning|error|emergency)\((".*%m.*")/log_\1_errno(errno, \2/' Plus some whitespace, linewrap, and indent adjustments.

treewide: a few more log_*_errno + return simplifications The one in tmpfiles.c:create_item() even looks like it fixes a bug.

treewide: no need to negate errno for log_*_errno() It corrrectly handles both positive and negative errno values.

treewide: auto-convert the simple cases to log_*_errno() As a followup to 086891e5c1 "log: add an "error" parameter to all low-level logging calls and intrdouce log_error_errno() as log calls that take error numbers", use sed to convert the simple cases to use the new macros: find . -name '*.[ch]' | xargs sed -r -i -e \ 's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/' Multi-line log_*() invocations are not covered. And we also should add log_unit_*_errno().

Introduce CONF_DIRS_NULSTR helper to define standard conf dirs Several different systemd tools define a nulstr containing a standard series of configuration file directories, in /etc, /run, /usr/local/lib, /usr/lib, and (#ifdef HAVE_SPLIT_USR) /lib. Factor that logic out into a new helper macro, CONF_DIRS_NULSTR.

sysctl: make --prefix allow all kinds of sysctl paths Currently, we save arguments passed as --prefix directly and compare them later to absolute sysctl file-system paths. That is, you are required to specify arguments to --prefix with leading /proc/sys/. This is kinda uselesss. Furthermore, we replace dots by slashes in the name, which makes it impossible to match on specific sysfs paths that have dots in their name (like netdev names). The intention of this argument is clear, but it never worked as expected. This patch modifies --prefix to accept any kind of sysctl paths. It supports paths prefixed with /proc/sys for compatibility (but drops the erroneous dot->slash conversion), but instead applies normalize_sysctl() which turns any name or path into a proper path. It then appends /proc/sys/ so we can properly use it in matches. Thanks to Jan Synacek <jsynacek@redhat.com> for catching this!

hashmap: introduce hash_ops to make struct Hashmap smaller It is redundant to store 'hash' and 'compare' function pointers in struct Hashmap separately. The functions always comprise a pair. Store a single pointer to struct hash_ops instead. systemd keeps hundreds of hashmaps, so this saves a little bit of memory.

Unify parse_argv style getopt is usually good at printing out a nice error message when commandline options are invalid. It distinguishes between an unknown option and a known option with a missing arg. It is better to let it do its job and not use opterr=0 unless we actually want to suppress messages. So remove opterr=0 in the few places where it wasn't really useful. When an error in options is encountered, we should not print a lengthy help() and overwhelm the user, when we know precisely what is wrong with the commandline. In addition, since help() prints to stdout, it should not be used except when requested with -h or --help. Also, simplify things here and there.

sysctl: replaces some slashes with dots It turns out that plain sysctl understands a.b/c syntax to write to /proc/sys/a/b.c. Support this for compatibility. https://bugs.freedesktop.org/show_bug.cgi?id=77466

Use strlen even for constant strings GCC optimizes strlen("string constant") to a constant, even with -O0. Thus, replace patterns like sizeof("string constant")-1 with strlen("string constant") where possible, for clarity. In particular, for expressions intended to add up the lengths of components going into a string, this often makes it clearer that the expression counts the trailing '\0' exactly once, by putting the +1 for the '\0' at the end of the expression, rather than hidden in a sizeof in the middle of the expression.

shared: add root argument to search_and_fopen This adds the same root argument to search_and_fopen that conf_files_list already has. Tools that use those two functions as a pair can now be easily modified to load configuration files from an alternate root filesystem tree.

Remove unused variables

strv: multiple cleanups - turn strv_merge into strv_extend_strv. appending strv b to the end of strv a instead of creating a new strv - strv_append: remove in favor of strv_extend and strv_push. - strv_remove: write slightly more elegant - strv_remove_prefix: remove unused function - strv_overlap: use strv_contains - strv_printf: STRV_FOREACH handles NULL correctly

log: log_error() and friends add a newline after each line anyway, so avoid including it in the log strings

Remove duplicate includes

clients: unify how we invoke getopt_long() Among other things this makes sure we always expose a --version command and show it in the help texts.

sysctl: allow overwriting of values specified in "later" files

fileio: in envfiles, do not skip lines following empty lines https://bugs.freedesktop.org/show_bug.cgi?id=63477

util: rename write_one_line_file() to write_string_file() You can write much more than just one line with this call (and we frequently do), so let's correct the naming.

systemd-sysctl: Handle missing /etc/sysctl.conf properly Since fabe5c0e5fce730aa66e10a9c4f9fdd443d7aeda, systemd-sysctl returns a non-zero exit code if /etc/sysctl.conf does not exist, due to a broken ENOENT check.

honor SELinux labels, when creating and writing config files Also split out some fileio functions to fileio.c and provide a SELinux aware pendant in fileio-label.c see https://bugzilla.redhat.com/show_bug.cgi?id=881577

sysctl: fix uninitalized memory access in error path src/sysctl/sysctl.c: In function ‘parse_file’: src/sysctl/sysctl.c:172:41: warning: ‘property’ may be used uninitialized in this function [-Wmaybe-uninitialized]

binfmt,tmpfiles,modules-load,sysctl: rework the various early-boot services that work on .d/ directories This unifies much of the logic behind them: - All four will now ofllow the rule that the earlier file and earlier assignment in the .d/ directories wins. Before, sysctl was the only outlier, where the later setting always won. - All four now support getopt() and --help on the command line. - All four can now handle specification of configuration file names on the command line to apply. The tools will automatically find them, and apply them. Previously only tmpfiles could do that. This is useful for %post scripts in RPMs and suchlike. - This fixes various error path issues in conf_files_list()

shared: conf-files - add root parameter

sysctl: parse all keys in a config file https://bugzilla.redhat.com/show_bug.cgi?id=869779

sysctl: avoiding exiting with error on -EEXIST If the final key in any sysctl.d file is a duplicate, systemd-sysctl will exit with an error (and no explaination why). Ignore this, as duplicate keys are to be expected when overriding settings in the directory hierarchy.

sysctl: always return the last error we encountered

sysctl: fix error code handling After if (r <= 0) r can't be 0 so if (k < 0 && r == 0) never happens.

sysctl: apply configuration at once https://bugzilla.redhat.com/show_bug.cgi?id=767795 [ Simplified by iterating the config files in the backwards order - no need for hashmap_update(). Other minor cleanups. -- michich ]

log.h: new log_oom() -> int -ENOMEM, use it also a number of minor fixups and bug fixes: spelling, oom errors that didn't print errors, not properly forwarding error codes, few more consistency issues, et cetera

use "Out of memory." consistantly (or with "\n") glibc/glib both use "out of memory" consistantly so maybe we should consider that instead of this. Eliminates one string out of a number of binaries. Also fixes extra newline in udev/scsi_id

util: split-out path-util.[ch]

util: split-out conf-file.[ch]

move all tools to subdirs