Issue 1698: Use safe_sleep executable in bash scripts

[ruvceskistefan]

Problems were:

• the implementation of sleep in the case when both ping and sleep are missing in safe_sleep function
• usage of standard sleep function instead of safe_sleep in bash script

Related issue: #1698

After this change, safe_sleep is implemented as separate executable bash script, and scripts run-helper.sh and update.sh are using that function instead of standard sleep function.

[fhammerl]

I'm always a bit iffy on relative paths, does is work fine if I start run.sh with an absolute path from a different directory?

[ruvceskistefan]

I changed to absolute paths and changed the location of the safe_sleep script, so it is not in bin folder.

[fhammerl]

👍

[Mart-Bogdan]

How this got merged? This is definitely endless loop.

runner/src/Misc/layoutroot/safe_sleep.sh

Lines 3 to 6 in 0ebdf9e

	SECONDS=0
	while [[ $SECONDS != $1 ]]; do
	:
	done

EDIT. Oh, SECONDS is autoincremented by bash. didn't know that.

[elupus]

Why is this not attempting to yield using a potentially available sleep call on the systems where that is available. Ie close to all systems. Could just do that inside the new loop.

Busy waiting is always really bad.