linux - Bash script entrypoint (PID=1) kills `tail` sub process ONLY if a fake trap (which does NOTHING) was there -


i facing strange behavior in bash script, have bash script running pid 1 (it entrypoint docker container, if not familier docker, assume can ignore info).

when run following script, sigterm terminates quickly, , seems fine (please keep in mind sshd service not exist! whole system starts script runs tail nothing more, till not problem).

#!/bin/bash  trap "pkill sshd" sigterm  export path=/usr/local/samba/bin/:/usr/local/samba/sbin/:$path  if [ -f /usr/local/samba/etc/smb.conf ];         exec /usr/local/samba/sbin/samba -i else         tail -f /dev/null & wait ${!} fi

the problem comes when delete trap. system hangs, , seems because tail till running , not end reason. (if familier docker, docker waits 10 seconds, , kill container, because didn't respond sigterm, again if not familier docker, ignore info).

#!/bin/bash  export path=/usr/local/samba/bin/:/usr/local/samba/sbin/:$path  if [ -f /usr/local/samba/etc/smb.conf ];         exec /usr/local/samba/sbin/samba -i else         tail -f /dev/null & wait ${!} fi

could 1 explain me problem exactly? why fake trap makes work (although practically nothing, works because there).

i still want mention using empty trap: trap "" sigterm doesn't help, should there in trap work (even if nothing).

hope can me, thanks!


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