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.

detect-virt: add new --chroot switch to detect chroot() environments

detect-virt: various modernizations

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.

basic: rework virtualization detection API Introduce a proper enum, and don't pass around string ids anymore. This simplifies things quite a bit, and makes virtualization detection more similar to architecture detection.

remove unused includes 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.

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().

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.

virt: make Virtualization an anonymous enum This makes llvm happy when we assign an error code to the variable.

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.

virt: move caching of virtualization check results into detect_vm() and detect_container() After all, we ended up calling detect_container() more often than detect_virtualization(), hence the former one should cache the results, since the latter is only a wrapper around the former.

build-sys: drop all distribution specfic checks Yay, we now have a completely generic systemd. No distribution specific checks anymore!

systemd-detect-virt: fix "option '--quiet' requires an argument" https://bugs.freedesktop.org/show_bug.cgi?id=50671

silence a bunch of gcc warnings

move all tools to subdirs