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.

tree-wide: group include of libudev.h with sd-*

tree-wide: sort includes Sort the includes accoding to the new coding style.

proc-cmdline: return proper errors from shall_restore_state() Let's not eat up errors in shall_restore_state(), but in the consumers instead, just for the sake of keeping the library calls generic.

util-lib: split out allocation calls into alloc-util.[ch]

util-lib: move /proc/cmdline parsing code to proc-cmdline.[ch]

util-lib: move string table stuff into its own string-table.[ch]

util-lib: split string parsing related calls from util.[ch] into parse-util.[ch]

util-lib: split out IO related calls to io-util.[ch]

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: split out escaping code into escape.[ch] This really deserves its own file, given how much code this is now.

rfkill: consistently use = in designator

rfkill: rework and make it listen on /dev/rfkill With this rework we introduce systemd-rfkill.service as singleton that is activated via systemd-rfkill.socket that listens on /dev/rfkill. That way, we get notified each time a new rfkill device shows up or changes state, in which case we restore and save its current setting to disk. This is nicer than the previous logic, as this means we save/restore state even of rfkill devices that are around only intermittently, and save/restore the state even if the system is shutdown abruptly instead of cleanly. This implements what I suggested in #1019 and obsoletes it.

fileio: consolidate write_string_file*() 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.

rfkill: rework how we generate file names from rfkill devices Generate the file name from ID_PATH plus the rfkill type (wlan, bluetooth, ...) and ignore the rfkill device name, since it apparently is not a stable identifier. Also, ensure that devices disappearing don't result in broken services, simply exit cleanly.

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: 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().

rfkill: Avoid error when state restore is disabled When the state restore is disabled, we would print: "Unknown verb: load" instead of simply skipping loading the state.

util: unify reading of /proc/cmdline Instead of individually checking for containers in each user do this once in a new call proc_cmdline() that read the file only if we are not in a container.

trivial: rfkill - don't include util.h twice

trivial: rfkill: It's util.h, not utils.h How about we actually run make locally before pushing, eh?

kerne-command-line: introduce option 'systemd.restore_state' When set to 0 this will stop tools like the backlight and rfkill tools to restore state from previous boot. This is useful in case the stored state is bogus to the extent that it is preventing you from resetting it (e.g., the backlight settings cause the screen to be off on boot on a system where the backlight can not be adjusted directly from the keyboard).

backlight: include ID_PATH in file names for backlight settings Much like for rfkill devices we should provide some stability regarding enumeration order, hence include the stable bits of the device path in the file name we store settings under.

rfkill: use ID_PATH as identifier for rfkill state files Let's include the stable device path for the rfkill devices in the name of the file we store the rfkill state in, so that we have some stability regarding enumeration order.

rfkill: add new rfkill tool to save/restore rfkill state across reboots This works analogous to the existing backlight and random seed services