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
|
|
@ -1,7 +1,8 @@
|
|||
#!/bin/sh
|
||||
#!/bin/sh -e
|
||||
#
|
||||
# 2016 Daniel Heule (hda at sfs.biz)
|
||||
# Copyright 2017, Philippe Gregoire <pg@pgregoire.xyz>
|
||||
# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
|
||||
#
|
||||
# This file is part of cdist.
|
||||
#
|
||||
|
|
@ -19,21 +20,422 @@
|
|||
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
|
||||
#
|
||||
#
|
||||
# Returns the process name of pid 1 ( normaly the init system )
|
||||
# for example at linux this value is "init" or "systemd" in most cases
|
||||
# Returns the name of the init system (PID 1)
|
||||
|
||||
# Expected values:
|
||||
# Linux:
|
||||
# Adélie Linux:
|
||||
# sysvinit+openrc
|
||||
# Alpine Linux:
|
||||
# busybox-init+openrc
|
||||
# ArchLinux:
|
||||
# systemd, sysvinit
|
||||
# CRUX:
|
||||
# sysvinit
|
||||
# Debian:
|
||||
# systemd, upstart, sysvinit, openrc, ???
|
||||
# Devuan:
|
||||
# sysvinit, sysvinit+openrc
|
||||
# Gentoo:
|
||||
# sysvinit+openrc, openrc-init, systemd
|
||||
# OpenBMC:
|
||||
# systemd
|
||||
# OpenWrt:
|
||||
# procd, init???
|
||||
# RedHat (RHEL, CentOS, Fedora, RedHat Linux, ...):
|
||||
# systemd, upstart, upstart-legacy, sysvinit
|
||||
# Slackware:
|
||||
# sysvinit
|
||||
# SuSE:
|
||||
# systemd, sysvinit
|
||||
# Ubuntu:
|
||||
# systemd, upstart, upstart-legacy, sysvinit
|
||||
# VoidLinux:
|
||||
# runit
|
||||
#
|
||||
# GNU:
|
||||
# Debian:
|
||||
# sysvinit, hurd-init
|
||||
#
|
||||
# BSD:
|
||||
# {Free,Open,Net}BSD:
|
||||
# init
|
||||
#
|
||||
# Mac OS X:
|
||||
# launchd, init+SystemStarter
|
||||
#
|
||||
# Solaris/Illumos:
|
||||
# smf, init???
|
||||
|
||||
uname_s="$(uname -s)"
|
||||
# NOTE: init systems can be stacked. This is popular to run OpenRC on top of
|
||||
# sysvinit (Gentoo) or busybox-init (Alpine), but can also be used to run runit
|
||||
# as a systemd service. This makes init system detection very complicated
|
||||
# (which result is expected?) This script tries to untangle some combinations,
|
||||
# OpenRC on top of sysv or busybox (X+openrc), but will ignore others (runit as
|
||||
# a systemd service)
|
||||
|
||||
case "$uname_s" in
|
||||
# NOTE: When we have no idea, nothing will be printed!
|
||||
|
||||
# NOTE:
|
||||
# When trying to gather information about the init system make sure to do so
|
||||
# without calling the binary! On some systems this triggers a reinitialisation
|
||||
# of the system which we don't want (e.g. embedded systems).
|
||||
|
||||
|
||||
set -e
|
||||
|
||||
KERNEL_NAME=$(uname -s)
|
||||
|
||||
KNOWN_INIT_SYSTEMS=$(cat <<EOF
|
||||
systemd
|
||||
sysvinit
|
||||
upstart
|
||||
runit
|
||||
procd
|
||||
smf
|
||||
launchd
|
||||
init
|
||||
hurd_init
|
||||
systemstarter
|
||||
EOF
|
||||
)
|
||||
|
||||
|
||||
common_candidates_by_kernel() {
|
||||
case $KERNEL_NAME
|
||||
in
|
||||
FreeBSD|NetBSD|OpenBSD)
|
||||
echo init
|
||||
;;
|
||||
Linux)
|
||||
(pgrep -P0 -l | awk '/^1[ \t]/ {print $2;}') || true
|
||||
echo systemd
|
||||
echo sysvinit
|
||||
echo upstart
|
||||
;;
|
||||
FreeBSD|OpenBSD)
|
||||
ps -o comm= -p 1 || true
|
||||
GNU)
|
||||
echo sysvinit
|
||||
echo hurd-init
|
||||
;;
|
||||
*)
|
||||
# return a empty string as unknown value
|
||||
echo ""
|
||||
Darwin)
|
||||
echo launchd
|
||||
echo systemstarter
|
||||
;;
|
||||
SunOS)
|
||||
echo smf
|
||||
;;
|
||||
esac
|
||||
}
|
||||
|
||||
|
||||
## Helpers
|
||||
|
||||
trim() {
|
||||
sed -e 's/^[[:blank:]]*//' -e 's/[[:blank:]]*$//' -e '/^[[:blank:]]*$/d'
|
||||
}
|
||||
|
||||
unique() {
|
||||
# Delete duplicate lines (keeping input order)
|
||||
# NOTE: Solaris AWK breaks without if/print construct.
|
||||
awk '{ if (!x[$0]++) print }'
|
||||
}
|
||||
|
||||
|
||||
## Check functions
|
||||
# These functions are used to verify if a guess is correct by checking some
|
||||
# common property of a running system (presence of a directory in /run etc.)
|
||||
|
||||
check_busybox_init() (
|
||||
busybox_path=${1:-/bin/busybox}
|
||||
test -x "${busybox_path}" || return 1
|
||||
grep -q 'BusyBox v[0-9]' "${busybox_path}" || return 1
|
||||
|
||||
# It is quite common to use Busybox init to stack other init systemd
|
||||
# (like OpenRC) on top of it. So we check for that, too.
|
||||
if stacked=$(check_openrc)
|
||||
then
|
||||
echo "busybox-init+${stacked}"
|
||||
else
|
||||
echo busybox-init
|
||||
fi
|
||||
)
|
||||
|
||||
check_hurd_init() (
|
||||
init_exe=${1:-/hurd/init}
|
||||
test -x "${init_exe}" || return 1
|
||||
grep -q 'GNU Hurd' "${init_exe}" || return 1
|
||||
echo hurd-init
|
||||
)
|
||||
|
||||
check_init() {
|
||||
# Checks for various BSD inits...
|
||||
test -x /sbin/init || return 1
|
||||
|
||||
if grep -q -E '(Free|Net|Open)BSD' /sbin/init
|
||||
then
|
||||
echo init
|
||||
return 0
|
||||
fi
|
||||
}
|
||||
|
||||
check_launchd() {
|
||||
command -v launchctl >/dev/null 2>&1 || return 1
|
||||
launchctl getenv PATH >/dev/null || return 1
|
||||
echo launchd
|
||||
}
|
||||
|
||||
check_openrc() {
|
||||
test -f /run/openrc/softlevel || return 1
|
||||
echo openrc
|
||||
}
|
||||
|
||||
check_procd() (
|
||||
procd_path=${1:-/sbin/procd}
|
||||
test -x "${procd_path}" || return 1
|
||||
grep -q 'procd' "${procd_path}" || return 1
|
||||
echo procd
|
||||
)
|
||||
|
||||
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
|
||||
}
|
||||
|
||||
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
|
||||
}
|
||||
|
||||
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=$(check_openrc)
|
||||
then
|
||||
echo "sysvinit+${stacked}"
|
||||
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