Since 8b8024f1c2 and the follow-up commits, the
main config file may be located in /usr or in other paths. But the code in
analyze.c was still assuming that it must be in /etc. Things mostly worked for
our own config files because we usually install a comments-only file in /etc,
but was not correct in the general case.
This fixes in particular 'systemd-analyze cat-config systemd/zram-generator.conf'.
In Fedora we distribute a config file in zram-generator-defaults.rpm that is in
/usr/lib, and 'cat-config' would refuse to show it because
/etc/systemd/zram-generator.conf does not exist.
The main config file is optional, but let's print an informative message
because this is a slightly unusual case.
The file paths that we printed were missing the root prefix.
The function name `method_reload` is used both in dbus-unit.c and
dbus-manager.c for static functions.
With the previous addition of adding the function name to the audit
information on SELinux denials, rename the one (and its relatives) in
dbus-unit.c as most of the functions in src/core/dbus-unit.c are already
prefixed with `bus_unit_`.
`mac_selinux_generic_access_check()` should not be called directly, only
via the wrapper macros `mac_selinux_access_check` and
`mac_selinux_unit_access_check`.
path might be NULL when checking against the system permissions, so wrap
with strna().
The command line might not be available over D-Bus and thus cl might be
empty. Print "n/a" instead of the empty string.
Include the systemd C function name in the audit message to improve the
debug ability on denials.
Similar like kernel denial messages include the syscall name.
The existing verify_hash_table() function is renamed to
verify_data_hash_table() since it only verifies the data hash table.
The verify information is also made a little more detailed by splitting
one of the checks in two.
