Attachment 89759 Details for Bug 71996 – /sbin/init wrapper that will demonstrate the issue

/sbin/init wrapper that will demonstrate the issue

bug71996-init-logger (text/plain), 2.93 KB, created by Scott Moser on 2013-11-25 15:57:25 UTC

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Creator: Scott Moser

Created: 2013-11-25 15:57:25 UTC

Size: 2.93 KB

patch

obsolete

>#!/bin/bash
>#
># This script provides a wrapper around /sbin/init that demonstrates
># bug plymouth bug 71996 https://bugs.freedesktop.org/show_bug.cgi?id=71996
># (aka http://pad.lv/1235231 and http://pad.lv/682831)
>#
># Call the script with 'install <target>' to wrap /sbin/init inside <target>
># with this program.  Then, on boot this program will start writing output
># to its standard out (/dev/console) every NAPLEN seconds. and will
># also record information into LOGNAME.
>#
># You should generally be able to just install this script as /sbin/init
># and then reboot, and check logs of /dev/console to verify data is missing.
>#
># To reproduce on ubuntu 13.10 within lxc:
>#   sudo apt-get --quiet --assume-yes install lxc
>#   sudo lxc-create -t ubuntu-cloud -n source-precise-amd64 -- \
>#      --arch=amd64 --release=precise
>#   
>#   sudo lxc-clone -o source-precise-amd64 -n test1
>#   sudo bash ./bug71996-init-logger install /var/lib/lxc/test1/rootfs
>#   sudo lxc-start -n test1
>#
>#   This should result in 'XX: i=N' messages for all values of N > 0 and < 150.
>#   In lxc, I will often lose writes 0 - 6.
>#
># You can also reproduce this in a ubuntu cloud image via kvm 
>#  http://tinyurl.com/k5v4ff6
># or on an instance in EC2 or openstack.
># 
>export NAPLEN=".2" MAX="150" LOGNAME="/run/my.log"
>
># call with 'install target' to install into root at target
># ie, install /
>if [ "$1" = "install" ]; then
>   [ "$(id -u)" = "0" ] || { echo "must be root"; exit 1; }
>   target=${2:-""}
>   target=${target%/}
>   [ -e "$target/sbin/init.real" ] ||
>      mv "$target/sbin/init" "$target/sbin/init.real" ||
>      { echo "failed mv $target/sbin/init"; exit 1; }
>   [ "$0" -ef "$target/sbin/init" ] &&
>      { echo "already good"; exit 0; }
>   cp "$0" "$target/sbin/init" ||
>      { echo "failed cp $0 $target/sbin/init"; exit 1; }
>   chmod 755 "$target/sbin/init" ||
>      { echo "failed chmod 755 $target/sbin/init"; exit 1; }
>   echo "installed into $target/sbin/init"
>   exit
>elif [ "$1" = "uninstall" ]; then
>   [ "$(id -u)" = "0" ] || { echo "must be root"; exit 1; }
>   target=${2:-""}
>   mv "$target/sbin/init.real" "$target/sbin/init"
>   echo "uninstalled wraper around $target/sbin/init"
>   exit
>fi
>
>if [ "$0" = "/sbin/init" ]; then
>  sh -c '
>  LOG=""
>
>  say() {
>    local pre="XX:" up="" idle="" ret=""
>    if [ "$1" = "UPTIME:" ]; then
>      read up idle < /proc/uptime
>      shift;
>    fi
>    ret="${up:+${up} }$*"
>    if [ -z "$LOG" ]; then
>       if sh -fc "echo $upmsg > \"$LOGNAME\"" >/dev/null 2>&1; then
>          LOG="$LOGNAME"
>          echo "$UPMSG" >> "$LOG"
>          say "initialized log at $up"
>       fi
>    else
>       echo $pre $ret >> "$LOG"
>    fi
>    echo $pre $ret
>    _RET="$ret"
>  }
>
>  i=0
>  say UPTIME: "first up"
>  UPMSG="$_RET"
>  while [ $i -lt $MAX ]; do
>    say "i=$i"
>    i=$(($i+1))
>    sleep $NAPLEN
>  done
>  read up idle < /proc/uptime
>  say UPTIME: "finished. i=$i"
>  ' bug71996-logger &
>else
>   unset NAPLEN MAX LOGNAME
>fi
>
>exec -a /sbin/init "/sbin/init.real" "$@"

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