[Libvir] [PATCH] Test libvirtd's config-processing code.

[Jim Meyering]

Until now, there has been no coverage of libvirtd's config-processing code.
In adding this, (and esp. in comparing actual/expected diagnostics),
I noticed and fixed a trivial inconsistency: for a parameter expecting
a string value, an invalid values, you'd get a different diagnostic for
the four config parameters that are parsed via remoteConfigGetAuth than
for all of the other config parameters (which go through checkType).
This fixes that, too:

	Test libvirtd's config-processing code.
	And remove a minor diagnostic inconsistency.
	* tests/daemon-conf: New test.
	* tests/Makefile.am (TESTS_ENVIRONMENT): Prepend qemud/ to PATH,
	so we can invoke libvirtd without an absolute name.
	(test_scripts): Add daemon-conf.
	* qemud/qemud.c (remoteConfigGetAuth): Use checkType,
	rather than open-coding it with a different diagnostic.

Signed-off-by: Jim Meyering <meyering at redhat.com>
---
 qemud/qemud.c     |    4 +--
 tests/Makefile.am |    3 ++
 tests/daemon-conf |   64 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+), 3 deletions(-)
 create mode 100755 tests/daemon-conf

diff --git a/qemud/qemud.c b/qemud/qemud.c
index 9794c03..f15cadd 100644
--- a/qemud/qemud.c
+++ b/qemud/qemud.c
@@ -1783,10 +1783,8 @@ static int remoteConfigGetAuth(virConfPtr conf, const char *key, int *auth, cons
     if (!p)
         return 0;

-    if (p->type != VIR_CONF_STRING) {
-        qemudLog (QEMUD_ERR, "remoteReadConfigFile: %s: %s: should be a string\n", filename, key);
+    if (checkType (p, filename, key, VIR_CONF_STRING) < 0)
         return -1;
-    }

     if (!p->str)
         return 0;
diff --git a/tests/Makefile.am b/tests/Makefile.am
index bec8b05..a918bcc 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -47,7 +47,9 @@ noinst_PROGRAMS = xmlrpctest xml2sexprtest sexpr2xmltest virshtest conftest \
         nodeinfotest

 test_scripts = \
+	daemon-conf \
 	int-overflow
+
 EXTRA_DIST += $(test_scripts)

 TESTS = xml2sexprtest sexpr2xmltest virshtest test_conf.sh xmconfigtest \
@@ -63,6 +65,7 @@ endif
 TESTS_ENVIRONMENT =				\
   abs_top_builddir=`pwd`/'$(top_builddir)'	\
   abs_top_srcdir=`pwd`/'$(top_srcdir)'		\
+  PATH='$(abs_top_builddir)/qemud$(PATH_SEPARATOR)'"$$PATH" \
   $(VG)

 valgrind:
diff --git a/tests/daemon-conf b/tests/daemon-conf
new file mode 100755
index 0000000..db1f0d3
--- /dev/null
+++ b/tests/daemon-conf
@@ -0,0 +1,64 @@
+#!/bin/sh
+# Get coverage of libvirtd's config-parsing code.
+
+# Boilerplate code to set up a test directory, cd into it,
+# and to ensure we remove it upon completion.
+this_test_() { echo "./$0" | sed 's,.*/,,'; }
+t_=$(this_test_)-$$
+init_cwd_=$(pwd)
+trap 'st=$?; d='"$t_"';
+    cd '"$init_cwd_"' && chmod -R u+rwx "$d" && rm -rf "$d" && exit $st' 0
+trap '(exit $?); exit $?' 1 2 13 15
+mkdir "$t_" || fail=1
+cd "$t_" || fail=1
+
+# Start with the sample libvirtd.conf file, uncommenting all real directives.
+sed -n 's/^#\([^ #]\)/\1/p' $abs_top_srcdir/qemud/libvirtd.conf > tmp.conf
+
+# Iterate through that list of directives, corrupting one RHS at a
+# time and running libvirtd with the resulting config.  Each libvirtd
+# invocation must fail.
+n=$(wc -l < tmp.conf)
+i=1
+while :; do
+  param_name=$(sed -n "$i"'s/ = .*//p' tmp.conf)
+  rhs=$(sed -n "$i"'s/.* = \(.*\)/\1/p' tmp.conf)
+  f=in$i.conf
+  # Change an RHS that starts with '"' or '[' to "3".
+  # Change an RHS that starts with 0 or 1 to the string '"foo"'.
+  sed "$i"'s/ = [["].*/ = 3/;'"$i"'s/ = [01].*/ = "foo"/' tmp.conf > $f
+  libvirtd --config=$f 2> err && fail=1
+  case $rhs in
+    # '"'*) msg='should be a string';;
+    '"'*) msg='invalid type: got long; expected string';;
+    [01]*) msg='invalid type: got string; expected long';;
+    '['*) msg='must be a string or list of strings';;
+    *) echo "unexpected RHS: $rhs" 1>&2; fail=1;;
+  esac
+
+  test $i = $n && break
+
+  # Filter out this diagnostic.
+  sed '/^Cannot set group when not running as root$/d' err > k && mv k err
+
+  printf '%s\n\n' "remoteReadConfigFile: $f: $param_name: $msg" > expected-err
+  diff -u expected-err err || fail=1
+
+  i=$(expr $i + 1)
+done
+
+# Run with the unmodified config file.
+libvirtd --config=tmp.conf > log 2>&1 & pid=$!
+sleep 2
+kill $pid
+
+# Expect an orderly shut-down and successful exit.
+wait $pid || fail=1
+
+# "cat log" would print this for non-root:
+#   Cannot set group when not running as root
+#   Shutting down on signal 15
+# And normally, we'd require that output, but obviously
+# it'd be different for root.
+
+exit $fail
--
1.5.3.7.1116.gae2a9