| === Guest62484 is now known as rcj | ||
| arksi | does anybody have suggestions on how to detatch and run in background a command through runcmd? | 20:21 |
|---|---|---|
| harmw | nohup or cmd & | 20:21 |
| smoser | arksi, is cloud-init waiting if you use & ? | 20:22 |
| smoser | runcmd: | 20:22 |
| smoser | [ sh, -c, 'mycommand >/var/log/mycommand.log 2>&1 </dev/null &' ] | 20:22 |
| smoser | something to that effect | 20:22 |
| arksi | thanks | 20:23 |
| arksi | I will find out if it waits | 20:23 |
| arksi | I was trying | 20:23 |
| arksi | [ setsid, program, & ] | 20:24 |
| smoser | arksi, well that will probably just fail | 20:27 |
| arksi | It does ;) | 20:27 |
| smoser | as it will try to execute 'setsid' with the arguments: 'program' and '&' | 20:27 |
| arksi | I will try your recommendation and see how it goes | 20:27 |
| arksi | right | 20:27 |
| smoser | if you just quote it, it will pass it to shell | 20:28 |
| arksi | I didn't know we could use hardquotes like that | 20:28 |
| arksi | right | 20:28 |
| arksi | makes sense | 20:28 |
| arksi | good idea | 20:28 |
| smoser | ie, if the entry is a string it passes to shell | 20:28 |
| arksi | I will let you know how it works | 20:28 |
| arksi | right | 20:28 |
| arksi | [ /bin/sh, -c , ... ] | 20:28 |
| arksi | is clever | 20:28 |
| arksi | thanks a lot | 20:28 |
| smoser | just to be cleare, above: | 20:28 |
| smoser | runcmd: | 20:28 |
| arksi | Right | 20:28 |
| smoser | - "setsid program &" | 20:29 |
| smoser | - "another program" | 20:29 |
| arksi | Does runcmd spawn a subshell? | 20:29 |
| smoser | will do what you want. invoking sh -c 'setsid program' | 20:29 |
| arksi | spawn subshell and exec? | 20:29 |
| arksi | right | 20:29 |
| smoser | if its a string, it goes to shell | 20:29 |
| smoser | if its an array, no shell | 20:29 |
| arksi | ah | 20:29 |
| arksi | so it is equivalent to invoking system() if it is an array? | 20:30 |
| smoser | generally speaking i hate passing things to shell | 20:30 |
| smoser | :) | 20:30 |
| arksi | same heh | 20:30 |
| smoser | i would have though tsystem would go to a shell | 20:31 |
| arksi | you are right | 20:32 |
| arksi | system() invokes the shell and executes as a separate process | 20:32 |
| arksi | exec() family replaces the current process with the program being exec'd | 20:33 |
| arksi | system() = fork(), execve() and wait() | 20:33 |
| arksi | I have to run a stupid program that checks for runlevel heh | 20:34 |
| arksi | while cloud-init is running (on CentOS 7, at least), if you invoke runlevel command it reports 'unknown' | 20:35 |
| arksi | (why anybody in this century is still checking runlevels is a mystery to me...) | 20:35 |
| arksi | so I cannot invoke this program directly through cloud-init, hence I am trying to get it to detatch from init process and run in the background after waiting for runlevel 3 | 20:36 |
| arksi | horrible stuff :) | 20:36 |
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