init: improve systemd debug facilities

The "best" "feature" of systemd "init system" has just emerged once again: it will happily sit there idling given startup or shutdown loops resulting in what looks like a hang to an unsuspecting user; let's provide the suspecting one with at least some tools described at http://www.freedesktop.org/wiki/Software/systemd/Debugging

init: improve systemd debug facilities
4534ca31 · Michael Shigorin · 80448ae1 · 4534ca31
Commit 4534ca31 authored Oct 20, 2015 by Michael Shigorin
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config.mk features.in/init/config.mk +5 -0

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--- a/features.in/init/config.mk
+++ b/features.in/init/config.mk
@@ -22,5 +22,10 @@ use/init/systemd: use/init
 	@$(call set,INIT_TYPE,systemd)
 	@$(call add,INSTALL2_PACKAGES,installer-feature-journald-tty)

+# http://www.freedesktop.org/wiki/Software/systemd/Debugging
 use/init/systemd/debug: use/init/systemd use/services
+	@$(call add,THE_PACKAGES,systemd-shutdown-debug-script)
 	@$(call add,SERVICES_ENABLE,debug-shell)
+	@$(call add,STAGE2_BOOTARGS,systemd.log_level=debug)
+	@$(call add,STAGE2_BOOTARGS,systemd.log_target=kmsg)
+	@$(call add,STAGE2_BOOTARGS,log_buf_len=1M enforcing=0)