[JIRA] (OVIRT-899) Create locking on experimental flow

[Barak Korren (oVirt JIRA)]

    [ https://ovirt-jira.atlassian.net/browse/OVIRT-899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=23700#comment-23700 ] 

Barak Korren commented on OVIRT-899:
------------------------------------

As we've talked, the code will probably work better over time if the loop is not infinite, like so:
{code}
MAX_LOCK_ATTEMPTS=120
LOCK_WAIT_INTERVAL=5
LOCK_PATH=$HOME/experimental_repo.lock

wait_for_lock() {
  trap "rm -f '$LOCK_PATH'" EXIT
  for ((i = 0; i < $MAX_LOCK_ATTEMPTS; i++)); do
    (set -o noclobber; > $LOCK_PATH) 2> /dev/null && return
    sleep $LOCK_WAIT_INTERVAL
  done
  echo "Timed out waiting for lock" >&2
  exit 1
}
{code}
 


> Create locking on experimental flow
> -----------------------------------
>
>                 Key: OVIRT-899
>                 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-899
>             Project: oVirt - virtualization made easy
>          Issue Type: Task
>            Reporter: Gil Shinar
>            Assignee: infra
>
> In order to make experimental flow atomic, we need to do as follows:
> in deploy.sh script and in start_testing_latest.sh we need to add a loop in the beginning of each script that does the following:
> *while 1:
> do
>   is_locked=$((echo aaa > my.lock) 2> /dev/null || echo is locked)
>   if [[ -z $is_locked ]]; then
>     break
>   else
>     sleep 5
>   fi
> done*
> Wrap the whole script with a  trap so in the end if each script we will be able to remove my.lock no matter what happened.



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