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tests: facilitate background process debug in ceph-helpers.sh

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When displaying the output of a background process, do it on stderr so
that it is not bufferized. Otherwise the output of the background
process may be displayed after it completed.

Prefix the output of a background process with the PID of the process
known to the parent instead of the PID of the awk process processing the
output. When wait_background loops, it will print the process on which
it is waiting and it is confusing that they do not match with the PID
prefixing the process output.

Refs: http://tracker.ceph.com/issues/17830

Signed-off-by: Loic Dachary <loic@dachary.org>
This commit is contained in:
Loic Dachary 2016-11-24 19:52:14 +01:00
parent 44aaeb7fcc
commit f491ea062d
1 changed files with 1 additions and 1 deletions
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2
qa/workunits/ceph-helpers.sh
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@ -1413,7 +1413,7 @@ function run_in_background() {
shift;
# Execute the command and prepend the output with its pid
# We enforce to return the exit status of the command and not the awk one.
("$@" |& awk '{ a[i++] = $0 }END{for (i = 0; i in a; ++i) { print PROCINFO["pid"] ": " a[i]} }'; return ${PIPESTATUS[0]}) &
("$@" |& awk '{ a[i++] = $0 }END{for (i = 0; i in a; ++i) { print "'$$': " a[i]} }'; return ${PIPESTATUS[0]}) >&2 &
eval "$pid_variable+=\" $!\""
}