[PATCH 09/11] git p4 test: simplify timeout handling

From: "SZEDER Gábor" <szeder.dev@gmail.com>
To: git@vger.kernel.org
Cc: "Johannes Schindelin" <Johannes.Schindelin@gmx.de>,
	"Jeff King" <peff@peff.net>, "Junio C Hamano" <gitster@pobox.com>,
	"Luke Diamand" <luke@diamand.org>,
	"Lars Schneider" <larsxschneider@gmail.com>,
	"SZEDER Gábor" <szeder.dev@gmail.com>
Subject: [PATCH 09/11] git p4 test: simplify timeout handling
Date: Wed, 13 Mar 2019 13:24:17 +0100	[thread overview]
Message-ID: <20190313122419.2210-10-szeder.dev@gmail.com> (raw)
In-Reply-To: <20190313122419.2210-1-szeder.dev@gmail.com>

'lib-git-p4.sh' uses timeouts in a watchdog process to kill a
potentially stuck 'p4d' process and for certain cleanup operation
between tests.  It does so by first computing when the timeout should
expire, and then repeatedly asking for the current time in seconds
until it exceeds the expiration time, and for portability reasons it
uses a one-liner Python script to ask for the current time.

Replace these timeouts with downcounters, which, though not
necessarily shorter, are much simpler, at least in the sense that they
don't execute the Python interpreter every second.

After this change the helper function with that Python one-liner has
no callers left, remove it.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 t/lib-git-p4.sh | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/t/lib-git-p4.sh b/t/lib-git-p4.sh
index b5cb5075c2..c18f85082f 100644
--- a/t/lib-git-p4.sh
+++ b/t/lib-git-p4.sh
@@ -44,15 +44,6 @@ native_path () {
 	echo "$path"
 }
 
-# On Solaris the 'date +%s' function is not supported and therefore we
-# need this replacement.
-# Attention: This function is not safe again against time offset updates
-# at runtime (e.g. via NTP). The 'clock_gettime(CLOCK_MONOTONIC)'
-# function could fix that but it is not in Python until 3.3.
-time_in_seconds () {
-	(cd / && "$PYTHON_PATH" -c 'import time; print(int(time.time()))')
-}
-
 test_set_port P4DPORT
 
 P4PORT=localhost:$P4DPORT
@@ -105,15 +96,16 @@ start_p4d () {
 	# will be caught with the "kill -0" check below.
 	i=${P4D_START_PATIENCE:-300}
 
-	timeout=$(($(time_in_seconds) + $P4D_TIMEOUT))
+	nr_tries_left=$P4D_TIMEOUT
 	while true
 	do
-		if test $(time_in_seconds) -gt $timeout
+		if test $nr_tries_left -eq 0
 		then
 			kill -9 $p4d_pid
 			exit 1
 		fi
 		sleep 1
+		nr_tries_left=$(($nr_tries_left - 1))
 	done &
 	watchdog_pid=$!
 
@@ -167,10 +159,11 @@ p4_add_job () {
 }
 
 retry_until_success () {
-	timeout=$(($(time_in_seconds) + $RETRY_TIMEOUT))
-	until "$@" 2>/dev/null || test $(time_in_seconds) -gt $timeout
+	nr_tries_left=$RETRY_TIMEOUT
+	until "$@" 2>/dev/null || test $nr_tries_left -eq 0
 	do
 		sleep 1
+		nr_tries_left=$(($nr_tries_left - 1))
 	done
 }
 
-- 
2.21.0.499.g4d310c7a8e.dirty

