PR28430: debuginfod: support --passive mode

Add support for a limited mode for debuginfod that uses a pure
read-only sqlite index.  This mode is useful for load spreading based
on naively shared or replicated databases.

Signed-off-by: Frank Ch. Eigler <fche@redhat.com>

3 files changed, 86 insertions, 1 deletions

diff --git a/tests/ChangeLog b/tests/ChangeLog
index db8b13bd..a59cdd51 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,9 @@
+2021-11-05  Frank Ch. Eigler  <fche@redhat.com>
+
+	PR28430
+	* run-debuginfod-extraction-passive.sh: New test.
+	* Makefile.am (TESTS, EXTRA_DIST): Add it.
+
 2021-10-20  John M Mellor-Crummey  <johnmc@rice.edu>
 
 	* nvidia_extended_linemap_libdw.c: New file.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6d3e75af..bfb8b13a 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -235,7 +235,8 @@ TESTS += run-debuginfod-dlopen.sh \
 	 run-debuginfod-federation-metrics.sh \
          run-debuginfod-percent-escape.sh \
          run-debuginfod-x-forwarded-for.sh \
-         run-debuginfod-response-headers.sh
+         run-debuginfod-response-headers.sh \
+         run-debuginfod-extraction-passive.sh
 endif
 endif
 
@@ -531,6 +532,7 @@ EXTRA_DIST = run-arextract.sh run-arsymtest.sh run-ar.sh \
              run-debuginfod-archive-test.sh \
              run-debuginfod-percent-escape.sh \
 	     run-debuginfod-response-headers.sh \
+             run-debuginfod-extraction-passive.sh \
 	     debuginfod-rpms/fedora30/hello2-1.0-2.src.rpm \
 	     debuginfod-rpms/fedora30/hello2-1.0-2.x86_64.rpm \
 	     debuginfod-rpms/fedora30/hello2-debuginfo-1.0-2.x86_64.rpm \
diff --git a/tests/run-debuginfod-extraction-passive.sh b/tests/run-debuginfod-extraction-passive.sh
new file mode 100755
index 00000000..c2724b58
--- /dev/null
+++ b/tests/run-debuginfod-extraction-passive.sh
@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2019-2021 Red Hat, Inc.
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/debuginfod-subr.sh
+
+# for test case debugging, uncomment:
+set -x
+
+mkdir Z
+# This variable is essential and ensures no time-race for claiming ports occurs
+# set base to a unique multiple of 100 not used in any other 'run-debuginfod-*' test
+base=11000
+get_ports
+
+DB=${PWD}/.debuginfod.sqlite
+tempfiles $DB
+export DEBUGINFOD_CACHE_PATH=${PWD}/.client_cache
+
+cp -rvp ${abs_srcdir}/debuginfod-tars Z
+tempfiles Z
+
+env LD_LIBRARY_PATH=$ldpath ${abs_builddir}/../debuginfod/debuginfod $VERBOSE -d $DB -Z .tar.xz -Z .tar.bz2=bzcat -p $PORT1 -t0 -g0 -v Z > vlog$PORT1 2>&1 &
+PID1=$!
+tempfiles vlog$PORT1
+errfiles vlog$PORT1
+
+wait_ready $PORT1 'ready' 1
+
+# Start second passive server with same database
+env LD_LIBRARY_PATH=$ldpath ${abs_builddir}/../debuginfod/debuginfod $VERBOSE --passive -d $DB -Z .tar.xz -Z .tar.bz2=bzcat -p $PORT2 -v > vlog$PORT2 2>&1 &
+PID2=$!
+
+tempfiles vlog$PORT2
+errfiles vlog$PORT2
+
+wait_ready $PORT2 'ready' 1
+
+# Wait for first server to finish indexing
+wait_ready $PORT1 'thread_work_total{role="traverse"}' 1
+wait_ready $PORT1 'thread_work_pending{role="scan"}' 0
+wait_ready $PORT1 'thread_busy{role="scan"}' 0
+
+# No similar metrics for the passive server
+! (curl http://localhost:$PORT2/metrics | egrep 'role="scan"|role="groom"|role="traverse"')
+
+# Confirm no active threads
+! (ps -q $PID2 -e -L -o '%p %c %a' | egrep 'scan|groom|traverse')
+
+# Do a random lookup via passive server
+env LD_LIBRARY_PATH=$ldpath DEBUGINFOD_URLS=http://localhost:$PORT2 ${abs_builddir}/../debuginfod/debuginfod-find debuginfo cee13b2ea505a7f37bd20d271c6bc7e5f8d2dfcb
+
+tempfiles $DB*
+
+kill $PID1
+wait $PID1
+PID1=0
+
+kill $PID2
+wait $PID2
+PID2=0
+
+exit 0