[explorer/init] Support more init systems
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Dennis Camera
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1 changed files with 174 additions and 51 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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# 2016 Daniel Heule (hda at sfs.biz)
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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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# This file is part of cdist.
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#
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@ -23,59 +24,181 @@
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# for example at linux this value is "init" or "systemd" in most cases
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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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# Gentoo:
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# sysvinit, openrc-init
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# GNU:
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# Debian:
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# hurd-init, sysvinit
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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=$1 fname= targetDir=
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# Resolve potential symlinks until the ultimate target is found.
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while :
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do
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if ! test -e "$target"
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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 -- "${targetDir}")"
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else
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printf '%s/%s\n' "${targetDir%/}" "$fname"
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fi
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)
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case $(uname -s) in
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Linux)
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if test -d /proc/1/
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then
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comm_name=$(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 $2 }'
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|| ps -o comm= -p 1 2>/dev/null)
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fi
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Linux|GNU)
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# if test -f /proc/1/comm
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# then
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# comm_name=$(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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# fi
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case $comm_name
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in
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systemd)
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echo systemd
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;;
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init)
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# It could be anything...
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init_exe=$(shreadlink /proc/1/exe)
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if test -h /proc/1/exe
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then
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init_exe=/proc/1/exe
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else
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init_exe=$(command -v "$comm_name")
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fi
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if ! test -x "$init_exe"
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then
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# On some rare occasions it can happen that the
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# running init's binary has been replaced. In this
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# case Linux adjusts the symlink to "X (deleted)"
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case $init_exe
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in
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*' (deleted)')
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init_exe=${init_exe% (deleted)}
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test -x "$init_exe" || exit 1
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;;
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*)
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exit 1
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;;
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esac
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fi
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test -x "$comm_exe" || exit 1
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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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case $("$comm_exe" --version | head -n 1)
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in
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*SysV*)
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echo init
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;;
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*upstart*)
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echo upstart
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;;
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*)
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echo ""
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;;
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esac
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esac
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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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;;
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Darwin)
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basename "$(ps -o comm= -p 1 2>/dev/null)"
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;;
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*)
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# return a empty string as unknown value
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echo ""
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;;
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comm_name=$(basename "$init_exe")
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case $comm_name
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in
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init)
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: # handled below
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;;
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systemd)
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# NOTE: sd_booted(3)
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if test -d /run/systemd/system/
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then
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echo systemd
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exit 0
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fi
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# otherwise: treat like "init"
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;;
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*)
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echo "$comm_name"
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exit 0
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;;
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esac
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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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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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;;
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*'GNU Hurd'*)
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echo hurd-init
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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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;;
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esac
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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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;;
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Darwin)
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basename "$(ps -o comm= -p 1 2>/dev/null)"
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;;
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SunOS)
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comm_name=$(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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;;
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*)
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# return a empty string as unknown value
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echo ""
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;;
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esac
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