(this time with the correct address, sorry)
Hi,
I’ve noticed that sysvinit/sysv-rc start dæmons with a *lot* of
superfluous environment variables compared to manual invocation
with an environment cleaner of mine:
# cleanenv / env | sort
HOME=/
LC_ALL=C.UTF-8
PATH=/bin:/usr/bin:/sbin:/usr/sbin
I checked /proc/<pid>/environ for (exemplarily) cron from bootup
and from a manual 'cleanenv / /etc/init.d/cron st{op,art}' and
found these:
--- e1 2022-12-12 18:02:21.549735648 +0000
+++ e2 2022-12-12 18:02:21.049737965 +0000
@@ -1,20 +1,5 @@
-BOOT_IMAGE=/vmlinuz-5.10.0-19-amd64
-CONSOLE=/dev/console
HOME=/
-INIT_VERSION=sysvinit-2.96
LANG=C.UTF-8
+LC_ALL=C.UTF-8
PATH=/bin:/usr/bin:/sbin:/usr/sbin
-PREVLEVEL=N
-PWD=/
-RUNLEVEL=2
-SHELL=/bin/sh
-SHLVL=1
-TERM=linux
-VERBOSE=yes
_=/sbin/start-stop-daemon
-drop_caps=
-init=/sbin/init -ip=xxx.xxx.xxx.xx::xxx.xxx.xxx.1:255.255.255.0:xxxx.xxxxxx.xxx::off:xxx.xxx.xxx.xx:xxx.xxx.x.xx:xxx.xxx.xxx.xx
-previous=N
-rootmnt=/root
-runlevel=2
This means that, even for a manual invocation, these are added:
• LANG=C.UTF-8
• _=/sbin/start-stop-daemon
The former is set, but not exported, in /etc/default/locale and
therefore this is (probably) “as expected”, the second is from
the shell.
However, sysvinit at boot does extra things:
• The kernel commandline parameters are added:
‣ /proc/cmdline
BOOT_IMAGE, ip (but not the others!)
• The pid 1 enviro