[explorer/init] Clean up
This commit is contained in:
Dennis Camera
parent
21c9e3db18
commit
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1 changed files with 246 additions and 153 deletions
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@ -20,90 +20,151 @@
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# along with cdist. If not, see <http://www.gnu.org/licenses/>.
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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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# for example at linux this value is "init" or "systemd" in most cases
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# Returns the name of the init system (PID 1)
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#
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set -e
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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, ???
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# Gentoo:
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# sysvinit, openrc-init
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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, 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, sysvinit
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#
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# GNU:
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# Debian:
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# hurd-init, sysvinit
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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
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#
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# Solaris/Illumos:
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# smf, init
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# [root@fedora-12 ~]# readlink /proc/1/exe
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# /sbin/init (deleted)
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# [root@fedora-12 ~]# ls -l /proc/1/exe
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# lrwxrwxrwx. 1 root root 0 2020-01-30 23:00 /proc/1/exe -> /sbin/init (deleted)
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# inspired by https://stackoverflow.com/a/33266819
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shreadlink() (
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CDPATH=
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target=$1 fname= targetDir=
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set -e
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#set -x # DEBUG
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# Resolve potential symlinks until the ultimate target is found.
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while :
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do
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if ! test -e "$target"
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validate_busybox_init() {
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# It is quite common to use SysVinit 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=$(validate_openrc)
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then
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printf 'ERROR: %s does not exist.\n' "'$target'" >&2
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return 1
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fi
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# Change to target dir; necessary for correct resolution of target path.
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cd "$(dirname -- "$target")"
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fname=$(basename -- "$target") # Extract filename.
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[ "$fname" = '/' ] && fname='' # !! curiously, `basename /` returns '/'
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[ -L "$fname" ] || break
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# Extract [next] target path, which may be defined
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# *relative* to the symlink's own directory.
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# Note: We parse `ls -l` output to find the symlink target
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# which is the only POSIX-compliant, albeit somewhat fragile, way.
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# FIXME: Will break if one of the filenames contain ’ -> ’
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target=$(ls -l "$fname" | sed -e 's/^.* -> //')
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done
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# Get canonical dir. path
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targetDir=$(pwd -P)
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# Output the ultimate target's canonical path.
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# Note that we manually resolve paths ending in /. and /.. to make sure we have a normalized path.
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if test "$fname" = '.'
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then
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printf '%s\n' "${targetDir%/}"
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elif test "$fname" = '..'
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then
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# Caveat: something like /var/.. will resolve to /private (assuming /var@ -> /private/var), i.e. the '..' is applied
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# AFTER canonicalization.
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printf '%s\n' "$(dirname -- "${targetDir}")"
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echo "busybox-init+${stacked}"
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else
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printf '%s/%s\n' "${targetDir%/}" "$fname"
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echo busybox-init
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fi
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)
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}
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validate_hurd_init() {
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# FIXME: Test me!
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test -x /hurd/init || return 1
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grep -q 'GNU Hurd' /hurd/init || return 1
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echo hurd-init
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}
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case $(uname -s) in
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Linux|GNU)
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# if test -f /proc/1/comm
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validate_openrc() {
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test -f /run/openrc/softlevel || return 1
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echo openrc
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}
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validate_procd() {
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grep -q 'procd' /sbin/procd || return 1
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echo procd
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}
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validate_runit() {
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test -d /run/runit || return 1
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echo runit
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}
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validate_smf() {
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# XXX: Is this the correct way??
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test -f /etc/svc/volatile/svc_nonpersist.db || return 1
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echo smf
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}
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validate_systemd() {
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# NOTE: sd_booted(3)
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test -d /run/systemd/system/ || return 1
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# systemctl --version | sed -e '/^systemd/!d;s/^systemd //'
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echo systemd
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}
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validate_sysvinit() {
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test -x /sbin/init \
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&& grep -q 'INIT_VERSION=sysvinit-[0-9.]*' /sbin/init \
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|| return 1
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# It is quite common to use SysVinit 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=$(validate_openrc)
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then
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echo "sysvinit+${stacked}"
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else
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echo sysvinit
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fi
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unset stacked
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}
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validate_upstart() {
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test -x "$(command -v initctl)" || return 1
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case $(initctl version)
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in
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*'(upstart '*')')
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# if type -d /etc/init
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# then
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# comm_name=$(cat /proc/1/comm)
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# else
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# BusyBox's versions of ps and pgrep do not support some options
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# depending on which compile-time options have been used.
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# Both pgrep and ps are tried to get the command name
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# comm_name=$(
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# pgrep -P0 -l 2>/dev/null | awk '/^1[ \t]/ { print $2 }'
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# || ps -o comm= -p 1 2>/dev/null)
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# # modern (DBus-based?) upstart >= 0.5
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# :
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# elif type -d /etc/events.d
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# then
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# # ancient upstart
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# :
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# fi
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echo upstart
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;;
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*)
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return 1
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;;
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esac
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}
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init_exe=$(shreadlink /proc/1/exe)
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find_init_procfs() (
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# First, check if the required file in procfs exists...
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test -h /proc/1/exe || return 1
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# Find init executable
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init_exe=$(ls -l /proc/1/exe 2>/dev/null)
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init_exe=${init_exe#* -> }
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if ! test -x "$init_exe"
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then
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@ -122,83 +183,115 @@ case $(uname -s) in
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esac
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fi
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if test "$init_exe" = '/hurd/init'
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then
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# XXX: Could maybe be removed
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echo hurd-init
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exit 0
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fi
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echo "${init_exe}"
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)
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comm_name=$(basename "$init_exe")
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case $comm_name
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# BusyBox's versions of ps and pgrep do not support some options
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# depending on which compile-time options have been used.
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find_init_pgrep() {
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pgrep -P0 -fl 2>/dev/null | awk -F '[[:blank:]]' '$1 == 1 { print $2 }'
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}
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find_init_ps() {
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case $(uname -s)
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in
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init)
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: # handled below
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Darwin|NetBSD)
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ps -o ucomm= -p 1 2>/dev/null
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;;
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systemd)
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# NOTE: sd_booted(3)
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if test -d /run/systemd/system/
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then
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echo systemd
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exit 0
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fi
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# otherwise: treat like "init"
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FreeBSD)
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ps -o command= -p 1 2>/dev/null | cut -d ' ' -f 1
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;;
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OpenBSD)
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ps -o command -p 1 2>/dev/null | tail -n +2 | cut -d ' ' -f 1
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;;
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*)
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echo "$comm_name"
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exit 0
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ps -o comm= -p 1 2>/dev/null
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;;
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esac
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}
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# init: it could be anything...
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case $("$init_exe" --version 2>/dev/null | head -n 1)
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find_init() {
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case $(uname -s)
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in
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SysV*)
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# This is a little bit more specific than init
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echo sysvinit
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exit 0
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Linux|GNU|NetBSD)
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find_init_procfs || find_init_pgrep || find_init_ps
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;;
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*'GNU Hurd'*)
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echo hurd-init
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FreeBSD)
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find_init_procfs || find_init_ps
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;;
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*upstart*)
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echo upstart
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exit 0
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;;
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esac
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case $("$init_exe" --help 2>/dev/null | head -n 1)
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in
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BusyBox*)
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echo busybox
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exit 0
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OpenBSD)
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find_init_pgrep || find_init_ps
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;;
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Darwin|FreeBSD|SunOS)
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find_init_ps
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;;
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*)
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echo "Don't know how to determine init." >&2
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echo 'Please send a patch.' >&2
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exit 1
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esac
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}
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validate_by_comm_name() {
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case $1
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in
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busybox)
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validate_busybox_init
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;;
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init)
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# FIXME: Do some more magic here!
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echo init
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;;
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FreeBSD|OpenBSD)
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ps -o comm= -p 1 2>/dev/null || true
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openrc-init)
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validate_openrc >/dev/null && echo openrc-init
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;;
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Darwin)
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basename "$(ps -o comm= -p 1 2>/dev/null)"
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runit)
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validate_runit
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;;
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SunOS)
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comm_name=$(ps -o comm= -p 1 2>/dev/null)
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if test "$(basename "$comm_name")" != 'init'
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then
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echo "${comm_name}"
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exit 0
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fi
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# XXX: Is this the correct way??
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if test -f /etc/svc/volatile/svc_nonpersist.db
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then
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echo smf
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exit 0
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fi
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systemd)
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validate_systemd
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;;
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*)
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# return a empty string as unknown value
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echo ""
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# Run validate function by comm name if available.
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# Fall back to comm name if either it does not exist or
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# returns non-zero.
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type "validate_$1" >/dev/null && "validate_$1" || echo $1
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esac
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}
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try_all() {
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# init: it could be anything...
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# We try some approaches to gather more information about init without
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# calling it! On some init systemd this triggers a reinitialisation of
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# the system which we don't want (e.g. embedded systems).
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validate_sysvinit || \
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validate_openrc || \
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validate_runit || \
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validate_smf || \
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validate_upstart || \
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validate_hurd_init || \
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echo init # fallback
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}
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init=$(find_init)
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if test -x "${init}"
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then
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case $init
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in
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/hurd/init)
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# FIXME: Create validate function
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echo hurd-init
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;;
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*/init)
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try_all
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;;
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*)
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validate_by_comm_name "$(basename "${init}")"
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;;
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esac
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else
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validate_by_comm_name "${init}"
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fi
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