This patch fails to compile in my env throwing this error:


  CC       qemuagenttest.o
qemuagenttest.c: In function 'testQemuAgentGetFSInfoCommon.constprop':
qemuagenttest.c:242:5: error: 'ret_def' may be used uninitialized in this function [-Werror=maybe-uninitialized]
  242 |     virDomainDefFree(ret_def);
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [Makefile:5856: qemuagenttest.o] Error 1


I attempted to fix it by doing:

----

diff --git a/tests/qemuagenttest.c b/tests/qemuagenttest.c
index be53f7e61a..00dcf26681 100644
--- a/tests/qemuagenttest.c
+++ b/tests/qemuagenttest.c
@@ -175,7 +175,7 @@ testQemuAgentGetFSInfoCommon(virDomainXMLOptionPtr xmlopt,
     int ret = -1;
     char *domain_filename = NULL;
     qemuMonitorTestPtr ret_test;
-    virDomainDefPtr ret_def;
+    virDomainDefPtr ret_def = NULL;
 
     if (!test || !def)
         return -1;

------

I was able to compile it, but then 'make check' got rekt:

----
[...]
PASS: qemudomainsnapshotxml2xmltest
PASS: qemucommandutiltest
PASS: virsh-cpuset
../build-aux/test-driver: line 107: 19017 Segmentation fault      (core dumped) "$@" > $log_file 2>&1
FAIL: qemuagenttest
PASS: qemumigparamstest
[...]
============================================================================
Testsuite summary for libvirt 5.7.0
============================================================================
# TOTAL: 129
# PASS:  127
# SKIP:  1
# XFAIL: 0
# FAIL:  1
# XPASS: 0
# ERROR: 0
-----


Not sure if there is something wrong with the patch, or with the fix
I made (seems unlikely, but ...) or perhaps something else missing in my
env (is there any external libs needed for this?).


Thanks,


DHB


On 8/21/19 7:15 PM, Jonathon Jongsma wrote:
This function adds the complete filesystem information returned by the
qemu agent to an array of typed parameters with field names intended to
to be returned by virDomainGetGuestInfo()
---
 src/qemu/qemu_agent.c |  89 ++++++++++++++++++
 src/qemu/qemu_agent.h |   5 +
 tests/qemuagenttest.c | 210 +++++++++++++++++++++++++++++++++++++++---
 3 files changed, 291 insertions(+), 13 deletions(-)

diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index d5519cb243..c101805b23 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -1953,6 +1953,95 @@ qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
     return ret;
 }
 
+int
+qemuAgentGetFSInfoParams(qemuAgentPtr mon,
+                         virTypedParameterPtr *params,
+                         int *nparams, int *maxparams,
+                         virDomainDefPtr vmdef)
+{
+    int ret = -1;
+    qemuAgentFSInfoPtr *fsinfo = NULL;
+    size_t i, j;
+    int nfs;
+
+    nfs = qemuAgentGetFSInfoInternal(mon, &fsinfo, vmdef);
+
+    if (virTypedParamsAddUInt(params, nparams, maxparams,
+                              "fs.count", nfs) < 0)
+        goto cleanup;
+
+    for (i = 0; i < nfs; i++) {
+        char param_name[VIR_TYPED_PARAM_FIELD_LENGTH];
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.name", i);
+        if (virTypedParamsAddString(params, nparams, maxparams,
+                                    param_name, fsinfo[i]->name) < 0)
+            goto cleanup;
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.mountpoint", i);
+        if (virTypedParamsAddString(params, nparams, maxparams,
+                                    param_name, fsinfo[i]->mountpoint) < 0)
+            goto cleanup;
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.fstype", i);
+        if (virTypedParamsAddString(params, nparams, maxparams,
+                                    param_name, fsinfo[i]->fstype) < 0)
+            goto cleanup;
+
+        /* disk usage values are not returned by older guest agents, so
+         * only add the params if the value is set */
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.total-bytes", i);
+        if (fsinfo[i]->total_bytes != -1 &&
+            virTypedParamsAddULLong(params, nparams, maxparams,
+                                    param_name, fsinfo[i]->total_bytes) < 0)
+            goto cleanup;
+
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.used-bytes", i);
+        if (fsinfo[i]->used_bytes != -1 &&
+            virTypedParamsAddULLong(params, nparams, maxparams,
+                                    param_name, fsinfo[i]->used_bytes) < 0)
+            goto cleanup;
+
+        snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                 "fs.%zu.disk.count", i);
+        if (virTypedParamsAddUInt(params, nparams, maxparams,
+                                  param_name, fsinfo[i]->ndisks) < 0)
+            goto cleanup;
+        for (j = 0; j < fsinfo[i]->ndisks; j++) {
+            qemuAgentDiskInfoPtr d = fsinfo[i]->disks[j];
+            snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                     "fs.%zu.disk.%zu.alias", i, j);
+            if (d->alias &&
+                virTypedParamsAddString(params, nparams, maxparams,
+                                        param_name, d->alias) < 0)
+                goto cleanup;
+
+            snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                     "fs.%zu.disk.%zu.serial", i, j);
+            if (d->serial &&
+                virTypedParamsAddString(params, nparams, maxparams,
+                                        param_name, d->serial) < 0)
+                goto cleanup;
+
+            snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+                     "fs.%zu.disk.%zu.device", i, j);
+            if (d->devnode &&
+                virTypedParamsAddString(params, nparams, maxparams,
+                                        param_name, d->devnode) < 0)
+                goto cleanup;
+        }
+    }
+    ret = nfs;
+
+ cleanup:
+    for (i = 0; i < nfs; i++)
+        qemuAgentFSInfoFree(fsinfo[i]);
+    VIR_FREE(fsinfo);
+
+    return ret;
+}
 
 static int
 qemuAgentGetFSInfoInternal(qemuAgentPtr mon, qemuAgentFSInfoPtr **info,
diff --git a/src/qemu/qemu_agent.h b/src/qemu/qemu_agent.h
index 69b0176855..f6d74a2603 100644
--- a/src/qemu/qemu_agent.h
+++ b/src/qemu/qemu_agent.h
@@ -74,6 +74,11 @@ int qemuAgentFSThaw(qemuAgentPtr mon);
 int qemuAgentGetFSInfo(qemuAgentPtr mon, virDomainFSInfoPtr **info,
                        virDomainDefPtr vmdef);
 
+int qemuAgentGetFSInfoParams(qemuAgentPtr mon,
+                             virTypedParameterPtr *params,
+                             int *nparams, int *maxparams,
+                             virDomainDefPtr vmdef);
+
 int qemuAgentSuspend(qemuAgentPtr mon,
                      unsigned int target);
 
diff --git a/tests/qemuagenttest.c b/tests/qemuagenttest.c
index aa1e993649..cf80711e95 100644
--- a/tests/qemuagenttest.c
+++ b/tests/qemuagenttest.c
@@ -168,38 +168,45 @@ testQemuAgentFSTrim(const void *data)
 
 
 static int
-testQemuAgentGetFSInfo(const void *data)
+testQemuAgentGetFSInfoCommon(virDomainXMLOptionPtr xmlopt,
+                             qemuMonitorTestPtr *test,
+                             virDomainDefPtr *def)
 {
-    virDomainXMLOptionPtr xmlopt = (virDomainXMLOptionPtr)data;
-    qemuMonitorTestPtr test = qemuMonitorTestNewAgent(xmlopt);
+    int ret = -1;
     char *domain_filename = NULL;
-    virDomainDefPtr def = NULL;
-    virDomainFSInfoPtr *info = NULL;
-    int ret = -1, ninfo = 0, i;
+    qemuMonitorTestPtr ret_test;
+    virDomainDefPtr ret_def;
 
-    if (!test)
+    if (!test || !def)
+        return -1;
+
+    if (!(ret_test = qemuMonitorTestNewAgent(xmlopt)))
         return -1;
 
     if (virAsprintf(&domain_filename, "%s/qemuagentdata/fsinfo.xml",
                     abs_srcdir) < 0)
         goto cleanup;
 
-    if (!(def = virDomainDefParseFile(domain_filename, driver.caps, xmlopt,
-                                      NULL, VIR_DOMAIN_DEF_PARSE_INACTIVE)))
+    if (!(ret_def = virDomainDefParseFile(domain_filename, driver.caps, xmlopt,
+                                          NULL, VIR_DOMAIN_DEF_PARSE_INACTIVE)))
         goto cleanup;
 
-    if (qemuMonitorTestAddAgentSyncResponse(test) < 0)
+    if (qemuMonitorTestAddAgentSyncResponse(ret_test) < 0)
         goto cleanup;
 
-    if (qemuMonitorTestAddItem(test, "guest-get-fsinfo",
+    if (qemuMonitorTestAddItem(ret_test, "guest-get-fsinfo",
                                "{\"return\": ["
                                "  {\"name\": \"sda1\", \"mountpoint\": \"/\","
+                               "   \"total-bytes\":952840192,"
+                               "   \"used-bytes\":229019648,"
                                "   \"disk\": ["
-                               "     {\"bus-type\": \"ide\","
+                               "     {\"serial\": \"ARBITRARYSTRING\","
+                               "      \"bus-type\": \"ide\","
                                "      \"bus\": 1, \"unit\": 0,"
                                "      \"pci-controller\": {"
                                "        \"bus\": 0, \"slot\": 1,"
                                "        \"domain\": 0, \"function\": 1},"
+                               "      \"dev\": \"/dev/sda1\","
                                "      \"target\": 0}],"
                                "   \"type\": \"ext4\"},"
                                "  {\"name\": \"dm-1\","
@@ -221,6 +228,32 @@ testQemuAgentGetFSInfo(const void *data)
                                "  {\"name\": \"sdb1\","
                                "   \"mountpoint\": \"/mnt/disk\","
                                "   \"disk\": [], \"type\": \"xfs\"}]}") < 0)
+                               goto cleanup;
+    *test = ret_test;
+    ret_test = NULL;
+    *def = ret_def;
+    ret_def = NULL;
+    ret = 0;
+
+ cleanup:
+    VIR_FREE(domain_filename);
+    if (ret_test)
+        qemuMonitorTestFree(ret_test);
+    virDomainDefFree(ret_def);
+
+    return ret;
+}
+
+static int
+testQemuAgentGetFSInfo(const void *data)
+{
+    virDomainXMLOptionPtr xmlopt = (virDomainXMLOptionPtr)data;
+    qemuMonitorTestPtr test = NULL;
+    virDomainDefPtr def = NULL;
+    virDomainFSInfoPtr *info = NULL;
+    int ret = -1, ninfo = 0, i;
+
+    if (testQemuAgentGetFSInfoCommon(xmlopt, &test, &def) < 0)
         goto cleanup;
 
     if ((ninfo = qemuAgentGetFSInfo(qemuMonitorTestGetAgent(test),
@@ -295,7 +328,157 @@ testQemuAgentGetFSInfo(const void *data)
     for (i = 0; i < ninfo; i++)
         virDomainFSInfoFree(info[i]);
     VIR_FREE(info);
-    VIR_FREE(domain_filename);
+    virDomainDefFree(def);
+    qemuMonitorTestFree(test);
+    return ret;
+}
+
+static int
+testQemuAgentGetFSInfoParams(const void *data)
+{
+    virDomainXMLOptionPtr xmlopt = (virDomainXMLOptionPtr)data;
+    qemuMonitorTestPtr test = NULL;
+    virDomainDefPtr def = NULL;
+    virTypedParameterPtr params = NULL;
+    int nparams = 0, maxparams = 0;
+    int ret = -1;
+    unsigned int count;
+
+    if (testQemuAgentGetFSInfoCommon(xmlopt, &test, &def) < 0)
+        goto cleanup;
+
+    if (qemuAgentGetFSInfoParams(qemuMonitorTestGetAgent(test),
+                                 &params, &nparams, &maxparams, def) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       "Failed to execute qemuAgentGetFSInfoParams()");
+        goto cleanup;
+    }
+
+    if (virTypedParamsGetUInt(params, nparams, "fs.count", &count) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       "expected filesystem count");
+        goto cleanup;
+    }
+
+    if (count != 3) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       "expected 3 filesystems information, got %d", count);
+        ret = -1;
+        goto cleanup;
+    }
+    const char *name, *mountpoint, *fstype, *alias, *serial;
+    unsigned int diskcount;
+    unsigned long long bytesused, bytestotal;
+    if (virTypedParamsGetString(params, nparams, "fs.2.name", &name) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.2.mountpoint", &mountpoint) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.2.fstype", &fstype) < 0 ||
+        virTypedParamsGetULLong(params, nparams, "fs.2.used-bytes", &bytesused) <= 0 ||
+        virTypedParamsGetULLong(params, nparams, "fs.2.total-bytes", &bytestotal) <= 0 ||
+        virTypedParamsGetUInt(params, nparams, "fs.2.disk.count", &diskcount) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.2.disk.0.alias", &alias) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.2.disk.0.serial", &serial) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "Missing an expected parameter for sda1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+    if (
+        STRNEQ(name, "sda1") ||
+        STRNEQ(mountpoint, "/") ||
+        STRNEQ(fstype, "ext4") ||
+        bytesused != 229019648 ||
+        bytestotal != 952840192 ||
+        diskcount != 1 ||
+        STRNEQ(alias, "hdc") ||
+        STRNEQ(serial, "ARBITRARYSTRING"))
+    {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "unexpected filesystems information returned for sda1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+
+    const char *alias2;
+    if (virTypedParamsGetString(params, nparams, "fs.1.name", &name) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.1.mountpoint", &mountpoint) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.1.fstype", &fstype) < 0 ||
+        virTypedParamsGetULLong(params, nparams, "fs.1.used-bytes", &bytesused) == 1 ||
+        virTypedParamsGetULLong(params, nparams, "fs.1.total-bytes", &bytestotal) == 1 ||
+        virTypedParamsGetUInt(params, nparams, "fs.1.disk.count", &diskcount) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.1.disk.0.alias", &alias) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.1.disk.1.alias", &alias2) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "Incorrect parameters for dm-1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+    if (STRNEQ(name, "dm-1") ||
+        STRNEQ(mountpoint, "/opt") ||
+        STRNEQ(fstype, "vfat") ||
+        diskcount != 2 ||
+        STRNEQ(alias, "vda") ||
+        STRNEQ(alias2, "vdb")) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "unexpected filesystems information returned for dm-1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+
+    alias = NULL;
+    if (virTypedParamsGetString(params, nparams, "fs.0.name", &name) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.0.mountpoint", &mountpoint) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.0.fstype", &fstype) < 0 ||
+        virTypedParamsGetULLong(params, nparams, "fs.0.used-bytes", &bytesused) == 1 ||
+        virTypedParamsGetULLong(params, nparams, "fs.0.total-bytes", &bytestotal) == 1 ||
+        virTypedParamsGetUInt(params, nparams, "fs.0.disk.count", &diskcount) < 0 ||
+        virTypedParamsGetString(params, nparams, "fs.0.disk.0.alias", &alias) == 1) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "Incorrect parameters for sdb1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+    if (STRNEQ(name, "sdb1") ||
+        STRNEQ(mountpoint, "/mnt/disk") ||
+        STRNEQ(fstype, "xfs") ||
+        diskcount != 0 ||
+        alias != NULL) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+            "unexpected filesystems information returned for sdb1 (%s,%s)",
+            name, alias);
+        ret = -1;
+        goto cleanup;
+    }
+
+    if (qemuMonitorTestAddAgentSyncResponse(test) < 0)
+        goto cleanup;
+
+    if (qemuMonitorTestAddItem(test, "guest-get-fsinfo",
+                               "{\"error\":"
+                               "    {\"class\":\"CommandDisabled\","
+                               "     \"desc\":\"The command guest-get-fsinfo "
+                                               "has been disabled for "
+                                               "this instance\","
+                               "     \"data\":{\"name\":\"guest-get-fsinfo\"}"
+                               "    }"
+                               "}") < 0)
+        goto cleanup;
+
+    if (qemuAgentGetFSInfoParams(qemuMonitorTestGetAgent(test), &params,
+                                 &nparams, &maxparams, def) != -1) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       "agent get-fsinfo command should have failed");
+        goto cleanup;
+    }
+
+    ret = 0;
+
+ cleanup:
+    virTypedParamsFree(params, nparams);
     virDomainDefFree(def);
     qemuMonitorTestFree(test);
     return ret;
@@ -1288,6 +1471,7 @@ mymain(void)
     DO_TEST(FSFreeze);
     DO_TEST(FSThaw);
     DO_TEST(FSTrim);
+    DO_TEST(GetFSInfoParams);
     DO_TEST(GetFSInfo);
     DO_TEST(Suspend);
     DO_TEST(Shutdown);