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.

basic: re-sort includes My previous patch to only include what we use accidentially placed the added inlcudes in non-sorted order.

basic: include only what we use This is a cleaned up result of running iwyu but without forward declarations on src/basic.

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

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

util-lib: split xattr-related calls into xattr-util.[ch]

smack: label /etc/passwd and friends as '_' smack label when --with-smack-run-label' is enabled systemd-sysusers.service unit creates system users and groups and it could update /etc/passwd, /etc/group, /etc/shadow and /etc/gshadow. Those files should have '_' smack label because of accessibility. However, if systemd has its own smack label using '--with-smack-run-label' configuration, systemd-sysusers process spawned by systemd(pid:1) has its parent smack label and eventually updated files also is set as its parent smack label. This patch fixes that bug by labeling updated files as '_' smack label when --with-smack-run-label' is enabled.

smack: introduce new mac_smack_copy() function This adds a new mac_smack_copy() function in order to read the smack label from the source and apply it to the destination.

smack-util: revise smack-util apis and add read smack attr apis - Add smack xattr lookup table - Unify all of mac_smack_apply_xxx{_fd}() to mac_smack_apply() and mac_smack_apply_fd(). - Add smack xattr read apis similar with apply apis as mac_smack_read{_fd}().

tree-wide: fix write_string_file() user that should not create files The latest consolidation cleanup of write_string_file() revealed some users of that helper which should have used write_string_file_no_create() in the past but didn't. Basically, all existing users that write to files in /sys and /proc should not expect to write to a file which is not yet existant.

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.

build-sys: split internal basic/ library from shared/ basic/ can be used by everything cannot use anything outside of basic/ libsystemd/ can use basic/ cannot use shared/ shared/ can use libsystemd/