forked from ungleich-public/cdist
[explorer/init] Clean up
This commit is contained in:
Dennis Camera
parent
21c9e3db18
commit
d895bb0e87
1 changed files with 246 additions and 153 deletions
|
|
@ -20,90 +20,151 @@
|
|||
# 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)
|
||||
#
|
||||
|
||||
set -e
|
||||
|
||||
# Expected values:
|
||||
# Linux:
|
||||
# Adélie Linux:
|
||||
# sysvinit+openrc
|
||||
# Alpine Linux:
|
||||
# busybox-init+openrc
|
||||
# ArchLinux:
|
||||
# systemd, sysvinit
|
||||
# CRUX:
|
||||
# sysvinit
|
||||
# Debian:
|
||||
# systemd, upstart, sysvinit, openrc, ???
|
||||
# Devuan:
|
||||
# sysvinit, ???
|
||||
# Gentoo:
|
||||
# sysvinit, openrc-init
|
||||
|
||||
# sysvinit+openrc, openrc-init, systemd
|
||||
# OpenBMC:
|
||||
# systemd
|
||||
# OpenWrt:
|
||||
# procd, init??
|
||||
# RedHat (RHEL, CentOS, Fedora, RedHat Linux, ...):
|
||||
# systemd, upstart, sysvinit
|
||||
# Slackware:
|
||||
# sysvinit
|
||||
# SuSE:
|
||||
# systemd, sysvinit
|
||||
# Ubuntu:
|
||||
# systemd, upstart, sysvinit
|
||||
#
|
||||
# GNU:
|
||||
# Debian:
|
||||
# hurd-init, sysvinit
|
||||
#
|
||||
# BSD:
|
||||
# {Free,Open,Net}BSD:
|
||||
# init
|
||||
#
|
||||
# Mac OS X:
|
||||
# launchd, init
|
||||
#
|
||||
# Solaris/Illumos:
|
||||
# smf, init
|
||||
|
||||
|
||||
# [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)
|
||||
|
||||
# inspired by https://stackoverflow.com/a/33266819
|
||||
shreadlink() (
|
||||
CDPATH=
|
||||
target=$1 fname= targetDir=
|
||||
set -e
|
||||
#set -x # DEBUG
|
||||
|
||||
# Resolve potential symlinks until the ultimate target is found.
|
||||
while :
|
||||
do
|
||||
if ! test -e "$target"
|
||||
validate_busybox_init() {
|
||||
# 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=$(validate_openrc)
|
||||
then
|
||||
printf 'ERROR: %s does not exist.\n' "'$target'" >&2
|
||||
return 1
|
||||
fi
|
||||
|
||||
# Change to target dir; necessary for correct resolution of target path.
|
||||
cd "$(dirname -- "$target")"
|
||||
|
||||
fname=$(basename -- "$target") # Extract filename.
|
||||
[ "$fname" = '/' ] && fname='' # !! curiously, `basename /` returns '/'
|
||||
|
||||
[ -L "$fname" ] || break
|
||||
|
||||
# Extract [next] target path, which may be defined
|
||||
# *relative* to the symlink's own directory.
|
||||
# Note: We parse `ls -l` output to find the symlink target
|
||||
# which is the only POSIX-compliant, albeit somewhat fragile, way.
|
||||
# FIXME: Will break if one of the filenames contain ’ -> ’
|
||||
target=$(ls -l "$fname" | sed -e 's/^.* -> //')
|
||||
done
|
||||
|
||||
# Get canonical dir. path
|
||||
targetDir=$(pwd -P)
|
||||
|
||||
# Output the ultimate target's canonical path.
|
||||
# Note that we manually resolve paths ending in /. and /.. to make sure we have a normalized path.
|
||||
if test "$fname" = '.'
|
||||
then
|
||||
printf '%s\n' "${targetDir%/}"
|
||||
elif test "$fname" = '..'
|
||||
then
|
||||
# Caveat: something like /var/.. will resolve to /private (assuming /var@ -> /private/var), i.e. the '..' is applied
|
||||
# AFTER canonicalization.
|
||||
printf '%s\n' "$(dirname -- "${targetDir}")"
|
||||
echo "busybox-init+${stacked}"
|
||||
else
|
||||
printf '%s/%s\n' "${targetDir%/}" "$fname"
|
||||
echo busybox-init
|
||||
fi
|
||||
)
|
||||
}
|
||||
|
||||
validate_hurd_init() {
|
||||
# FIXME: Test me!
|
||||
test -x /hurd/init || return 1
|
||||
grep -q 'GNU Hurd' /hurd/init || return 1
|
||||
echo hurd-init
|
||||
}
|
||||
|
||||
case $(uname -s) in
|
||||
Linux|GNU)
|
||||
# if test -f /proc/1/comm
|
||||
validate_openrc() {
|
||||
test -f /run/openrc/softlevel || return 1
|
||||
echo openrc
|
||||
}
|
||||
|
||||
validate_procd() {
|
||||
grep -q 'procd' /sbin/procd || return 1
|
||||
echo procd
|
||||
}
|
||||
|
||||
validate_runit() {
|
||||
test -d /run/runit || return 1
|
||||
echo runit
|
||||
}
|
||||
|
||||
validate_smf() {
|
||||
# XXX: Is this the correct way??
|
||||
test -f /etc/svc/volatile/svc_nonpersist.db || return 1
|
||||
echo smf
|
||||
}
|
||||
|
||||
validate_systemd() {
|
||||
# NOTE: sd_booted(3)
|
||||
test -d /run/systemd/system/ || return 1
|
||||
# systemctl --version | sed -e '/^systemd/!d;s/^systemd //'
|
||||
echo systemd
|
||||
}
|
||||
|
||||
validate_sysvinit() {
|
||||
test -x /sbin/init \
|
||||
&& grep -q 'INIT_VERSION=sysvinit-[0-9.]*' /sbin/init \
|
||||
|| return 1
|
||||
|
||||
# It is quite common to use SysVinit to stack other init systemd
|
||||
# (like OpenRC) on top of it. So we check for that, too.
|
||||
if stacked=$(validate_openrc)
|
||||
then
|
||||
echo "sysvinit+${stacked}"
|
||||
else
|
||||
echo sysvinit
|
||||
fi
|
||||
unset stacked
|
||||
}
|
||||
|
||||
validate_upstart() {
|
||||
test -x "$(command -v initctl)" || return 1
|
||||
case $(initctl version)
|
||||
in
|
||||
*'(upstart '*')')
|
||||
# if type -d /etc/init
|
||||
# then
|
||||
# comm_name=$(cat /proc/1/comm)
|
||||
# else
|
||||
# BusyBox's versions of ps and pgrep do not support some options
|
||||
# depending on which compile-time options have been used.
|
||||
# Both pgrep and ps are tried to get the command name
|
||||
# comm_name=$(
|
||||
# pgrep -P0 -l 2>/dev/null | awk '/^1[ \t]/ { print $2 }'
|
||||
# || ps -o comm= -p 1 2>/dev/null)
|
||||
# # modern (DBus-based?) upstart >= 0.5
|
||||
# :
|
||||
# elif type -d /etc/events.d
|
||||
# then
|
||||
# # ancient upstart
|
||||
# :
|
||||
# fi
|
||||
echo upstart
|
||||
;;
|
||||
*)
|
||||
return 1
|
||||
;;
|
||||
esac
|
||||
}
|
||||
|
||||
init_exe=$(shreadlink /proc/1/exe)
|
||||
find_init_procfs() (
|
||||
# First, check if the required file in procfs exists...
|
||||
test -h /proc/1/exe || return 1
|
||||
|
||||
# Find init executable
|
||||
init_exe=$(ls -l /proc/1/exe 2>/dev/null)
|
||||
init_exe=${init_exe#* -> }
|
||||
|
||||
if ! test -x "$init_exe"
|
||||
then
|
||||
|
|
@ -122,83 +183,115 @@ case $(uname -s) in
|
|||
esac
|
||||
fi
|
||||
|
||||
if test "$init_exe" = '/hurd/init'
|
||||
then
|
||||
# XXX: Could maybe be removed
|
||||
echo hurd-init
|
||||
exit 0
|
||||
fi
|
||||
echo "${init_exe}"
|
||||
)
|
||||
|
||||
comm_name=$(basename "$init_exe")
|
||||
case $comm_name
|
||||
# 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 $(uname -s)
|
||||
in
|
||||
init)
|
||||
: # handled below
|
||||
Darwin|NetBSD)
|
||||
ps -o ucomm= -p 1 2>/dev/null
|
||||
;;
|
||||
systemd)
|
||||
# NOTE: sd_booted(3)
|
||||
if test -d /run/systemd/system/
|
||||
then
|
||||
echo systemd
|
||||
exit 0
|
||||
fi
|
||||
# otherwise: treat like "init"
|
||||
FreeBSD)
|
||||
ps -o command= -p 1 2>/dev/null | cut -d ' ' -f 1
|
||||
;;
|
||||
OpenBSD)
|
||||
ps -o command -p 1 2>/dev/null | tail -n +2 | cut -d ' ' -f 1
|
||||
;;
|
||||
*)
|
||||
echo "$comm_name"
|
||||
exit 0
|
||||
ps -o comm= -p 1 2>/dev/null
|
||||
;;
|
||||
esac
|
||||
}
|
||||
|
||||
# init: it could be anything...
|
||||
case $("$init_exe" --version 2>/dev/null | head -n 1)
|
||||
find_init() {
|
||||
case $(uname -s)
|
||||
in
|
||||
SysV*)
|
||||
# This is a little bit more specific than init
|
||||
echo sysvinit
|
||||
exit 0
|
||||
Linux|GNU|NetBSD)
|
||||
find_init_procfs || find_init_pgrep || find_init_ps
|
||||
;;
|
||||
*'GNU Hurd'*)
|
||||
echo hurd-init
|
||||
FreeBSD)
|
||||
find_init_procfs || find_init_ps
|
||||
;;
|
||||
*upstart*)
|
||||
echo upstart
|
||||
exit 0
|
||||
;;
|
||||
esac
|
||||
case $("$init_exe" --help 2>/dev/null | head -n 1)
|
||||
in
|
||||
BusyBox*)
|
||||
echo busybox
|
||||
exit 0
|
||||
OpenBSD)
|
||||
find_init_pgrep || find_init_ps
|
||||
;;
|
||||
Darwin|FreeBSD|SunOS)
|
||||
find_init_ps
|
||||
;;
|
||||
*)
|
||||
echo "Don't know how to determine init." >&2
|
||||
echo 'Please send a patch.' >&2
|
||||
exit 1
|
||||
esac
|
||||
}
|
||||
|
||||
validate_by_comm_name() {
|
||||
case $1
|
||||
in
|
||||
busybox)
|
||||
validate_busybox_init
|
||||
;;
|
||||
init)
|
||||
# FIXME: Do some more magic here!
|
||||
echo init
|
||||
;;
|
||||
FreeBSD|OpenBSD)
|
||||
ps -o comm= -p 1 2>/dev/null || true
|
||||
openrc-init)
|
||||
validate_openrc >/dev/null && echo openrc-init
|
||||
;;
|
||||
Darwin)
|
||||
basename "$(ps -o comm= -p 1 2>/dev/null)"
|
||||
runit)
|
||||
validate_runit
|
||||
;;
|
||||
SunOS)
|
||||
comm_name=$(ps -o comm= -p 1 2>/dev/null)
|
||||
if test "$(basename "$comm_name")" != 'init'
|
||||
then
|
||||
echo "${comm_name}"
|
||||
exit 0
|
||||
fi
|
||||
|
||||
# XXX: Is this the correct way??
|
||||
if test -f /etc/svc/volatile/svc_nonpersist.db
|
||||
then
|
||||
echo smf
|
||||
exit 0
|
||||
fi
|
||||
systemd)
|
||||
validate_systemd
|
||||
;;
|
||||
*)
|
||||
# return a empty string as unknown value
|
||||
echo ""
|
||||
# Run validate function by comm name if available.
|
||||
# Fall back to comm name if either it does not exist or
|
||||
# returns non-zero.
|
||||
type "validate_$1" >/dev/null && "validate_$1" || echo $1
|
||||
esac
|
||||
}
|
||||
|
||||
try_all() {
|
||||
# init: it could be anything...
|
||||
# We try some approaches to gather more information about init without
|
||||
# calling it! On some init systemd this triggers a reinitialisation of
|
||||
# the system which we don't want (e.g. embedded systems).
|
||||
|
||||
validate_sysvinit || \
|
||||
validate_openrc || \
|
||||
validate_runit || \
|
||||
validate_smf || \
|
||||
validate_upstart || \
|
||||
validate_hurd_init || \
|
||||
echo init # fallback
|
||||
}
|
||||
|
||||
init=$(find_init)
|
||||
|
||||
if test -x "${init}"
|
||||
then
|
||||
case $init
|
||||
in
|
||||
/hurd/init)
|
||||
# FIXME: Create validate function
|
||||
echo hurd-init
|
||||
;;
|
||||
esac
|
||||
*/init)
|
||||
try_all
|
||||
;;
|
||||
*)
|
||||
validate_by_comm_name "$(basename "${init}")"
|
||||
;;
|
||||
esac
|
||||
else
|
||||
validate_by_comm_name "${init}"
|
||||
fi
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue