Merge branch 'fix/init-explorer/busybox' into 'master'
[explorer/init] Support more init systems See merge request ungleich-public/cdist!850
This commit is contained in:
commit
2a5309b413
1 changed files with 418 additions and 16 deletions
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@ -1,7 +1,8 @@
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#!/bin/sh
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#!/bin/sh -e
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#
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#
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# 2016 Daniel Heule (hda at sfs.biz)
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# 2016 Daniel Heule (hda at sfs.biz)
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||||||
# Copyright 2017, Philippe Gregoire <pg@pgregoire.xyz>
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# Copyright 2017, Philippe Gregoire <pg@pgregoire.xyz>
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# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
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#
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#
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||||||
# This file is part of cdist.
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# This file is part of cdist.
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||||||
#
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#
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@ -19,21 +20,422 @@
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
|
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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||||||
#
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#
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# Returns the process name of pid 1 ( normaly the init system )
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# Returns the name of the init system (PID 1)
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# for example at linux this value is "init" or "systemd" in most cases
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# Expected values:
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# Linux:
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# Adélie Linux:
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# sysvinit+openrc
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# Alpine Linux:
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# busybox-init+openrc
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# ArchLinux:
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# systemd, sysvinit
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# CRUX:
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# sysvinit
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# Debian:
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# systemd, upstart, sysvinit, openrc, ???
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# Devuan:
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# sysvinit, sysvinit+openrc
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# Gentoo:
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# sysvinit+openrc, openrc-init, systemd
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# OpenBMC:
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# systemd
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# OpenWrt:
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# procd, init???
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# RedHat (RHEL, CentOS, Fedora, RedHat Linux, ...):
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# systemd, upstart, upstart-legacy, sysvinit
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# Slackware:
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# sysvinit
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# SuSE:
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# systemd, sysvinit
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# Ubuntu:
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# systemd, upstart, upstart-legacy, sysvinit
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# VoidLinux:
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# runit
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#
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#
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# GNU:
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# Debian:
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# sysvinit, hurd-init
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#
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# BSD:
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# {Free,Open,Net}BSD:
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# init
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#
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# Mac OS X:
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# launchd, init+SystemStarter
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|
#
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|
# Solaris/Illumos:
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# smf, init???
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|
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uname_s="$(uname -s)"
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# NOTE: init systems can be stacked. This is popular to run OpenRC on top of
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# sysvinit (Gentoo) or busybox-init (Alpine), but can also be used to run runit
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|
# as a systemd service. This makes init system detection very complicated
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# (which result is expected?) This script tries to untangle some combinations,
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# OpenRC on top of sysv or busybox (X+openrc), but will ignore others (runit as
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# a systemd service)
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|
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case "$uname_s" in
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# NOTE: When we have no idea, nothing will be printed!
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|
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# NOTE:
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# When trying to gather information about the init system make sure to do so
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|
# without calling the binary! On some systems this triggers a reinitialisation
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# of the system which we don't want (e.g. embedded systems).
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|
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|
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set -e
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|
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KERNEL_NAME=$(uname -s)
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|
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KNOWN_INIT_SYSTEMS=$(cat <<EOF
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|
systemd
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|
sysvinit
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|
upstart
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|
runit
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|
procd
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|
smf
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|
launchd
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|
init
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|
hurd_init
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|
systemstarter
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|
EOF
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|
)
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|
|
||||||
|
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||||||
|
common_candidates_by_kernel() {
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||||||
|
case $KERNEL_NAME
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||||||
|
in
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||||||
|
FreeBSD|NetBSD|OpenBSD)
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||||||
|
echo init
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||||||
|
;;
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||||||
Linux)
|
Linux)
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(pgrep -P0 -l | awk '/^1[ \t]/ {print $2;}') || true
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echo systemd
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|
echo sysvinit
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||||||
|
echo upstart
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;;
|
;;
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||||||
FreeBSD|OpenBSD)
|
GNU)
|
||||||
ps -o comm= -p 1 || true
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echo sysvinit
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||||||
|
echo hurd-init
|
||||||
;;
|
;;
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*)
|
Darwin)
|
||||||
# return a empty string as unknown value
|
echo launchd
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echo ""
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echo systemstarter
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||||||
|
;;
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||||||
|
SunOS)
|
||||||
|
echo smf
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;;
|
;;
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esac
|
esac
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|
}
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|
|
||||||
|
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||||||
|
## Helpers
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||||||
|
|
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|
trim() {
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|
sed -e 's/^[[:blank:]]*//' -e 's/[[:blank:]]*$//' -e '/^[[:blank:]]*$/d'
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|
}
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|
|
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|
unique() {
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|
# Delete duplicate lines (keeping input order)
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||||||
|
# NOTE: Solaris AWK breaks without if/print construct.
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|
awk '{ if (!x[$0]++) print }'
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|
}
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|
|
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|
|
||||||
|
## Check functions
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||||||
|
# These functions are used to verify if a guess is correct by checking some
|
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|
# common property of a running system (presence of a directory in /run etc.)
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|
|
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|
check_busybox_init() (
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busybox_path=${1:-/bin/busybox}
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|
test -x "${busybox_path}" || return 1
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||||||
|
grep -q 'BusyBox v[0-9]' "${busybox_path}" || return 1
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|
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# It is quite common to use Busybox init to stack other init systemd
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|
# (like OpenRC) on top of it. So we check for that, too.
|
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|
if stacked=$(check_openrc)
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|
then
|
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|
echo "busybox-init+${stacked}"
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|
else
|
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|
echo busybox-init
|
||||||
|
fi
|
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|
)
|
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|
|
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|
check_hurd_init() (
|
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|
init_exe=${1:-/hurd/init}
|
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|
test -x "${init_exe}" || return 1
|
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|
grep -q 'GNU Hurd' "${init_exe}" || return 1
|
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|
echo hurd-init
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|
)
|
||||||
|
|
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|
check_init() {
|
||||||
|
# Checks for various BSD inits...
|
||||||
|
test -x /sbin/init || return 1
|
||||||
|
|
||||||
|
if grep -q -E '(Free|Net|Open)BSD' /sbin/init
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||||||
|
then
|
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|
echo init
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||||||
|
return 0
|
||||||
|
fi
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||||||
|
}
|
||||||
|
|
||||||
|
check_launchd() {
|
||||||
|
command -v launchctl >/dev/null 2>&1 || return 1
|
||||||
|
launchctl getenv PATH >/dev/null || return 1
|
||||||
|
echo launchd
|
||||||
|
}
|
||||||
|
|
||||||
|
check_openrc() {
|
||||||
|
test -f /run/openrc/softlevel || return 1
|
||||||
|
echo openrc
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||||||
|
}
|
||||||
|
|
||||||
|
check_procd() (
|
||||||
|
procd_path=${1:-/sbin/procd}
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|
test -x "${procd_path}" || return 1
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||||||
|
grep -q 'procd' "${procd_path}" || return 1
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||||||
|
echo procd
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|
)
|
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|
|
||||||
|
check_runit() {
|
||||||
|
test -d /run/runit || return 1
|
||||||
|
echo runit
|
||||||
|
}
|
||||||
|
|
||||||
|
check_smf() {
|
||||||
|
# XXX: Is this the correct way??
|
||||||
|
test -f /etc/svc/volatile/svc_nonpersist.db || return 1
|
||||||
|
echo smf
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|
}
|
||||||
|
|
||||||
|
check_systemd() {
|
||||||
|
# NOTE: sd_booted(3)
|
||||||
|
test -d /run/systemd/system/ || return 1
|
||||||
|
# systemctl --version | sed -e '/^systemd/!d;s/^systemd //'
|
||||||
|
echo systemd
|
||||||
|
}
|
||||||
|
|
||||||
|
check_systemstarter() {
|
||||||
|
test -d /System/Library/StartupItems/ || return 1
|
||||||
|
test -f /System/Library/StartupItems/LoginWindow/StartupParameters.plist || return 1
|
||||||
|
echo init+SystemStarter
|
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|
}
|
||||||
|
|
||||||
|
check_sysvinit() (
|
||||||
|
init_path=${1:-/sbin/init}
|
||||||
|
grep -q 'INIT_VERSION=sysvinit-[0-9.]*' "${init_path}" || return 1
|
||||||
|
|
||||||
|
# It is quite common to use SysVinit to stack other init systemd
|
||||||
|
# (like OpenRC) on top of it. So we check for that, too.
|
||||||
|
if stacked=$(check_openrc)
|
||||||
|
then
|
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|
echo "sysvinit+${stacked}"
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|
else
|
||||||
|
echo sysvinit
|
||||||
|
fi
|
||||||
|
unset stacked
|
||||||
|
)
|
||||||
|
|
||||||
|
check_upstart() {
|
||||||
|
test -x "$(command -v initctl)" || return 1
|
||||||
|
case $(initctl version)
|
||||||
|
in
|
||||||
|
*'(upstart '*')')
|
||||||
|
if test -d /etc/init
|
||||||
|
then
|
||||||
|
# modern (DBus-based?) upstart >= 0.5
|
||||||
|
echo upstart
|
||||||
|
elif test -d /etc/event.d
|
||||||
|
then
|
||||||
|
# ancient upstart
|
||||||
|
echo upstart-legacy
|
||||||
|
else
|
||||||
|
# whatever...
|
||||||
|
echo upstart
|
||||||
|
fi
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
return 1
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
}
|
||||||
|
|
||||||
|
find_init_procfs() (
|
||||||
|
# First, check if the required file in procfs exists...
|
||||||
|
test -h /proc/1/exe || return 1
|
||||||
|
|
||||||
|
# Find init executable
|
||||||
|
init_exe=$(ls -l /proc/1/exe 2>/dev/null) || return 1
|
||||||
|
init_exe=${init_exe#* -> }
|
||||||
|
|
||||||
|
if ! test -x "$init_exe"
|
||||||
|
then
|
||||||
|
# On some rare occasions it can happen that the
|
||||||
|
# running init's binary has been replaced. In this
|
||||||
|
# case Linux adjusts the symlink to "X (deleted)"
|
||||||
|
|
||||||
|
# [root@fedora-12 ~]# readlink /proc/1/exe
|
||||||
|
# /sbin/init (deleted)
|
||||||
|
# [root@fedora-12 ~]# ls -l /proc/1/exe
|
||||||
|
# lrwxrwxrwx. 1 root root 0 2020-01-30 23:00 /proc/1/exe -> /sbin/init (deleted)
|
||||||
|
|
||||||
|
init_exe=${init_exe% (deleted)}
|
||||||
|
test -x "$init_exe" || return 1
|
||||||
|
fi
|
||||||
|
|
||||||
|
echo "${init_exe}"
|
||||||
|
)
|
||||||
|
|
||||||
|
guess_by_path() {
|
||||||
|
case $1
|
||||||
|
in
|
||||||
|
/bin/busybox)
|
||||||
|
check_busybox_init "$1" && return
|
||||||
|
;;
|
||||||
|
/lib/systemd/systemd)
|
||||||
|
check_systemd "$1" && return
|
||||||
|
;;
|
||||||
|
/hurd/init)
|
||||||
|
check_hurd_init "$1" && return
|
||||||
|
;;
|
||||||
|
/sbin/launchd)
|
||||||
|
check_launchd "$1" && return
|
||||||
|
;;
|
||||||
|
/usr/bin/runit|/sbin/runit)
|
||||||
|
check_runit "$1" && return
|
||||||
|
;;
|
||||||
|
/sbin/openrc-init)
|
||||||
|
if check_openrc "$1" >/dev/null
|
||||||
|
then
|
||||||
|
echo openrc-init
|
||||||
|
return
|
||||||
|
fi
|
||||||
|
;;
|
||||||
|
/sbin/procd)
|
||||||
|
check_procd "$1" && return
|
||||||
|
;;
|
||||||
|
/sbin/init|*/init)
|
||||||
|
# init: it could be anything -> (explicit) no match
|
||||||
|
return 1
|
||||||
|
;;
|
||||||
|
esac
|
||||||
|
|
||||||
|
# No match
|
||||||
|
return 1
|
||||||
|
}
|
||||||
|
|
||||||
|
guess_by_comm_name() {
|
||||||
|
case $1
|
||||||
|
in
|
||||||
|
busybox)
|
||||||
|
check_busybox_init && return
|
||||||
|
;;
|
||||||
|
openrc-init)
|
||||||
|
if check_openrc >/dev/null
|
||||||
|
then
|
||||||
|
echo openrc-init
|
||||||
|
return 0
|
||||||
|
fi
|
||||||
|
;;
|
||||||
|
init)
|
||||||
|
# init could be anything -> no match
|
||||||
|
return 1
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
# Run check function by comm name if available.
|
||||||
|
# Fall back to comm name if either it does not exist or
|
||||||
|
# returns non-zero.
|
||||||
|
if type "check_$1" >/dev/null
|
||||||
|
then
|
||||||
|
"check_$1" && return
|
||||||
|
else
|
||||||
|
echo "$1" ; return 0
|
||||||
|
fi
|
||||||
|
esac
|
||||||
|
|
||||||
|
return 1
|
||||||
|
}
|
||||||
|
|
||||||
|
check_list() (
|
||||||
|
# List must be a multi-line input on stdin (one name per line)
|
||||||
|
while read -r init
|
||||||
|
do
|
||||||
|
"check_${init}" || continue
|
||||||
|
return 0
|
||||||
|
done
|
||||||
|
return 1
|
||||||
|
)
|
||||||
|
|
||||||
|
|
||||||
|
# BusyBox's versions of ps and pgrep do not support some options
|
||||||
|
# depending on which compile-time options have been used.
|
||||||
|
|
||||||
|
find_init_pgrep() {
|
||||||
|
pgrep -P0 -fl 2>/dev/null | awk -F '[[:blank:]]' '$1 == 1 { print $2 }'
|
||||||
|
}
|
||||||
|
|
||||||
|
find_init_ps() {
|
||||||
|
case $KERNEL_NAME
|
||||||
|
in
|
||||||
|
Darwin)
|
||||||
|
ps -o command -p 1 2>/dev/null | tail -n +2
|
||||||
|
;;
|
||||||
|
FreeBSD)
|
||||||
|
ps -o args= -p 1 2>/dev/null | cut -d ' ' -f 1
|
||||||
|
;;
|
||||||
|
Linux)
|
||||||
|
ps -o comm= -p 1 2>/dev/null
|
||||||
|
;;
|
||||||
|
NetBSD)
|
||||||
|
ps -o comm= -p 1 2>/dev/null
|
||||||
|
;;
|
||||||
|
OpenBSD)
|
||||||
|
ps -o args -p 1 2>/dev/null | tail -n +2 | cut -d ' ' -f 1
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
ps -o args= -p 1 2>/dev/null
|
||||||
|
;;
|
||||||
|
esac | trim # trim trailing whitespace (some ps like Darwin add it)
|
||||||
|
}
|
||||||
|
|
||||||
|
find_init() {
|
||||||
|
case $KERNEL_NAME
|
||||||
|
in
|
||||||
|
Linux|GNU|NetBSD)
|
||||||
|
find_init_procfs || find_init_pgrep || find_init_ps
|
||||||
|
;;
|
||||||
|
FreeBSD)
|
||||||
|
find_init_procfs || find_init_ps
|
||||||
|
;;
|
||||||
|
OpenBSD)
|
||||||
|
find_init_pgrep || find_init_ps
|
||||||
|
;;
|
||||||
|
Darwin|SunOS)
|
||||||
|
find_init_ps
|
||||||
|
;;
|
||||||
|
*)
|
||||||
|
echo "Don't know how to determine init." >&2
|
||||||
|
echo 'Please send a patch.' >&2
|
||||||
|
exit 1
|
||||||
|
esac
|
||||||
|
}
|
||||||
|
|
||||||
|
# -----
|
||||||
|
|
||||||
|
init=$(find_init)
|
||||||
|
|
||||||
|
# If we got a path, guess by the path first (fall back to file name if no match)
|
||||||
|
# else guess by file name directly.
|
||||||
|
# shellcheck disable=SC2015
|
||||||
|
{
|
||||||
|
test -x "${init}" \
|
||||||
|
&& guess_by_path "${init}" \
|
||||||
|
|| guess_by_comm_name "$(basename "${init}")"
|
||||||
|
} && exit 0 || true
|
||||||
|
|
||||||
|
|
||||||
|
# Guessing based on the file path and name didn’t lead to a definitive result.
|
||||||
|
#
|
||||||
|
# We go through all of the checks until we find a match. To speed up the
|
||||||
|
# process, common cases will be checked first based on the underlying kernel.
|
||||||
|
|
||||||
|
{ common_candidates_by_kernel; echo "${KNOWN_INIT_SYSTEMS}"; } \
|
||||||
|
| unique | check_list
|
||||||
|
|
Loading…
Reference in a new issue