1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0+
3#
4# Run a series of tests on remote systems under KVM.
5#
6# Usage: kvm-remote.sh "systems" [ <kvm.sh args> ]
7#	 kvm-remote.sh "systems" /path/to/old/run [ <kvm-again.sh args> ]
8#
9# Copyright (C) 2021 Facebook, Inc.
10#
11# Authors: Paul E. McKenney <paulmck@kernel.org>
12
13scriptname=$0
14args="$*"
15
16if ! test -d tools/testing/selftests/rcutorture/bin
17then
18	echo $scriptname must be run from top-level directory of kernel source tree.
19	exit 1
20fi
21
22KVM="`pwd`/tools/testing/selftests/rcutorture"; export KVM
23PATH=${KVM}/bin:$PATH; export PATH
24. functions.sh
25
26starttime="`get_starttime`"
27
28systems="$1"
29if test -z "$systems"
30then
31	echo $scriptname: Empty list of systems will go nowhere good, giving up.
32	exit 1
33fi
34shift
35
36# Pathnames:
37# T:	  /tmp/kvm-remote.sh.$$
38# resdir: /tmp/kvm-remote.sh.$$/res
39# rundir: /tmp/kvm-remote.sh.$$/res/$ds ("-remote" suffix)
40# oldrun: `pwd`/tools/testing/.../res/$otherds
41#
42# Pathname segments:
43# TD:	  kvm-remote.sh.$$
44# ds:	  yyyy.mm.dd-hh.mm.ss-remote
45
46TD=kvm-remote.sh.$$
47T=${TMPDIR-/tmp}/$TD
48trap 'rm -rf $T' 0
49mkdir $T
50
51resdir="$T/res"
52ds=`date +%Y.%m.%d-%H.%M.%S`-remote
53rundir=$resdir/$ds
54echo Results directory: $rundir
55echo $scriptname $args
56if echo $1 | grep -q '^--'
57then
58	# Fresh build.  Create a datestamp unless the caller supplied one.
59	datestamp="`echo "$@" | awk -v ds="$ds" '{
60		for (i = 1; i < NF; i++) {
61			if ($i == "--datestamp") {
62				ds = "";
63				break;
64			}
65		}
66		if (ds != "")
67			print "--datestamp " ds;
68	}'`"
69	kvm.sh --remote "$@" $datestamp --buildonly > $T/kvm.sh.out 2>&1
70	ret=$?
71	if test "$ret" -ne 0
72	then
73		echo $scriptname: kvm.sh failed exit code $?
74		cat $T/kvm.sh.out
75		exit 2
76	fi
77	oldrun="`grep -m 1 "^Results directory: " $T/kvm.sh.out | awk '{ print $3 }'`"
78	touch "$oldrun/remote-log"
79	echo $scriptname $args >> "$oldrun/remote-log"
80	echo | tee -a "$oldrun/remote-log"
81	echo " ----" kvm.sh output: "(`date`)" | tee -a "$oldrun/remote-log"
82	cat $T/kvm.sh.out | tee -a "$oldrun/remote-log"
83	# We are going to run this, so remove the buildonly files.
84	rm -f "$oldrun"/*/buildonly
85	kvm-again.sh $oldrun --dryrun --remote --rundir "$rundir" > $T/kvm-again.sh.out 2>&1
86	ret=$?
87	if test "$ret" -ne 0
88	then
89		echo $scriptname: kvm-again.sh failed exit code $? | tee -a "$oldrun/remote-log"
90		cat $T/kvm-again.sh.out | tee -a "$oldrun/remote-log"
91		exit 2
92	fi
93else
94	# Re-use old run.
95	oldrun="$1"
96	if ! echo $oldrun | grep -q '^/'
97	then
98		oldrun="`pwd`/$oldrun"
99	fi
100	shift
101	touch "$oldrun/remote-log"
102	echo $scriptname $args >> "$oldrun/remote-log"
103	kvm-again.sh "$oldrun" "$@" --dryrun --remote --rundir "$rundir" > $T/kvm-again.sh.out 2>&1
104	ret=$?
105	if test "$ret" -ne 0
106	then
107		echo $scriptname: kvm-again.sh failed exit code $? | tee -a "$oldrun/remote-log"
108		cat $T/kvm-again.sh.out | tee -a "$oldrun/remote-log"
109		exit 2
110	fi
111	cp -a "$rundir" "$KVM/res/"
112	oldrun="$KVM/res/$ds"
113fi
114echo | tee -a "$oldrun/remote-log"
115echo " ----" kvm-again.sh output: "(`date`)" | tee -a "$oldrun/remote-log"
116cat $T/kvm-again.sh.out
117echo | tee -a "$oldrun/remote-log"
118echo Remote run directory: $rundir | tee -a "$oldrun/remote-log"
119echo Local build-side run directory: $oldrun | tee -a "$oldrun/remote-log"
120
121# Create the kvm-remote-N.sh scripts in the bin directory.
122awk < "$rundir"/scenarios -v dest="$T/bin" -v rundir="$rundir" '
123{
124	n = $1;
125	sub(/\./, "", n);
126	fn = dest "/kvm-remote-" n ".sh"
127	print "kvm-remote-noreap.sh " rundir " &" > fn;
128	scenarios = "";
129	for (i = 2; i <= NF; i++)
130		scenarios = scenarios " " $i;
131	print "kvm-test-1-run-batch.sh" scenarios >> fn;
132	print "sync" >> fn;
133	print "rm " rundir "/remote.run" >> fn;
134}'
135chmod +x $T/bin/kvm-remote-*.sh
136( cd "`dirname $T`"; tar -chzf $T/binres.tgz "$TD/bin" "$TD/res" )
137
138# Check first to avoid the need for cleanup for system-name typos
139for i in $systems
140do
141	ncpus="`ssh $i getconf _NPROCESSORS_ONLN 2> /dev/null`"
142	echo $i: $ncpus CPUs " " `date` | tee -a "$oldrun/remote-log"
143	ret=$?
144	if test "$ret" -ne 0
145	then
146		echo System $i unreachable, giving up. | tee -a "$oldrun/remote-log"
147		exit 4 | tee -a "$oldrun/remote-log"
148	fi
149done
150
151# Download and expand the tarball on all systems.
152for i in $systems
153do
154	echo Downloading tarball to $i `date` | tee -a "$oldrun/remote-log"
155	cat $T/binres.tgz | ssh $i "cd /tmp; tar -xzf -"
156	ret=$?
157	if test "$ret" -ne 0
158	then
159		echo Unable to download $T/binres.tgz to system $i, giving up. | tee -a "$oldrun/remote-log"
160		exit 10 | tee -a "$oldrun/remote-log"
161	fi
162done
163
164# Function to check for presence of a file on the specified system.
165# Complain if the system cannot be reached, and retry after a wait.
166# Currently just waits forever if a machine disappears.
167#
168# Usage: checkremotefile system pathname
169checkremotefile () {
170	local ret
171	local sleeptime=60
172
173	while :
174	do
175		ssh $1 "test -f \"$2\""
176		ret=$?
177		if test "$ret" -eq 255
178		then
179			echo " ---" ssh failure to $1 checking for file $2, retry after $sleeptime seconds. `date`
180		elif test "$ret" -eq 0
181		then
182			return 0
183		elif test "$ret" -eq 1
184		then
185			echo " ---" File \"$2\" not found: ssh $1 test -f \"$2\"
186			return 1
187		else
188			echo " ---" Exit code $ret: ssh $1 test -f \"$2\", retry after $sleeptime seconds. `date`
189			return $ret
190		fi
191		sleep $sleeptime
192	done
193}
194
195# Function to start batches on idle remote $systems
196#
197# Usage: startbatches curbatch nbatches
198#
199# Batches are numbered starting at 1.  Returns the next batch to start.
200# Be careful to redirect all debug output to FD 2 (stderr).
201startbatches () {
202	local curbatch="$1"
203	local nbatches="$2"
204	local ret
205
206	# Each pass through the following loop examines one system.
207	for i in $systems
208	do
209		if test "$curbatch" -gt "$nbatches"
210		then
211			echo $((nbatches + 1))
212			return 0
213		fi
214		if checkremotefile "$i" "$resdir/$ds/remote.run" 1>&2
215		then
216			continue # System still running last test, skip.
217		fi
218		ssh "$i" "cd \"$resdir/$ds\"; touch remote.run; PATH=\"$T/bin:$PATH\" nohup kvm-remote-$curbatch.sh > kvm-remote-$curbatch.sh.out 2>&1 &" 1>&2
219		ret=$?
220		if test "$ret" -ne 0
221		then
222			echo ssh $i failed: exitcode $ret 1>&2
223			exit 11
224		fi
225		echo " ----" System $i Batch `head -n $curbatch < "$rundir"/scenarios | tail -1` `date` 1>&2
226		curbatch=$((curbatch + 1))
227	done
228	echo $curbatch
229}
230
231# Launch all the scenarios.
232nbatches="`wc -l "$rundir"/scenarios | awk '{ print $1 }'`"
233curbatch=1
234while test "$curbatch" -le "$nbatches"
235do
236	startbatches $curbatch $nbatches > $T/curbatch 2> $T/startbatches.stderr
237	curbatch="`cat $T/curbatch`"
238	if test -s "$T/startbatches.stderr"
239	then
240		cat "$T/startbatches.stderr" | tee -a "$oldrun/remote-log"
241	fi
242	if test "$curbatch" -le "$nbatches"
243	then
244		sleep 30
245	fi
246done
247echo All batches started. `date`
248
249# Wait for all remaining scenarios to complete and collect results.
250for i in $systems
251do
252	while checkremotefile "$i" "$resdir/$ds/remote.run"
253	do
254		sleep 30
255	done
256	echo " ---" Collecting results from $i `date`
257	( cd "$oldrun"; ssh $i "cd $rundir; tar -czf - kvm-remote-*.sh.out */console.log */kvm-test-1-run*.sh.out */qemu[_-]pid */qemu-retval */qemu-affinity; rm -rf $T > /dev/null 2>&1" | tar -xzf - )
258done
259
260( kvm-end-run-stats.sh "$oldrun" "$starttime"; echo $? > $T/exitcode ) | tee -a "$oldrun/remote-log"
261exit "`cat $T/exitcode`"
262