[PATCH v4] qemu: Add callback struct for qemuBuildCommandLine

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Since 0d70656afded, it starts to access the sysfs files to build
the qemu command line (by virSCSIDeviceGetSgName, which is to find
out the scsi generic device name by adpater:bus:target:unit), there
is no way to work around, qemu wants to see the scsi generic device
like "/dev/sg6" anyway.

And there might be other places which need to access sysfs files
when building qemu command line in future.

Instead of increasing the arguments of qemuBuildCommandLine, this
introduces a new callback for qemuBuildCommandLine, and thus tests
can register their own callbacks for sysfs test input files accessing.

* src/qemu/qemu_command.h: (New callback struct
                            qemuBuildCommandLineCallbacks;
                            extern buildCommandLineCallbacks)
* src/qemu/qemu_command.c: (wire up the callback struct)
* src/qemu/qemu_driver.c: (Use the new syntax of qemuBuildCommandLine)
* src/qemu/qemu_hotplug.c: Likewise
* src/qemu/qemu_process.c: Likewise
* tests/qemuxml2argvtest.c: (Helper testSCSIDeviceGetSgName;
                             callback struct testCallbacks;
                             Use the callback struct)
* src/tests/qemuxmlnstest.c: (Like above)
---
 src/qemu/qemu_command.c  | 22 ++++++++++++++--------
 src/qemu/qemu_command.h  | 19 ++++++++++++++++---
 src/qemu/qemu_driver.c   |  3 ++-
 src/qemu/qemu_hotplug.c  |  6 ++++--
 src/qemu/qemu_process.c  |  3 ++-
 tests/qemuxml2argvtest.c | 21 ++++++++++++++++++++-
 tests/qemuxmlnstest.c    | 21 ++++++++++++++++++++-
 7 files changed, 78 insertions(+), 17 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index c268a3a..33a1910 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4757,17 +4757,18 @@ qemuBuildUSBHostdevUsbDevStr(virDomainHostdevDefPtr dev)
 
 char *
 qemuBuildSCSIHostdevDrvStr(virDomainHostdevDefPtr dev,
-                           virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED)
+                           virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED,
+                           qemuBuildCommandLineCallbacksPtr callbacks)
 {
     virBuffer buf = VIR_BUFFER_INITIALIZER;
     char *sg = NULL;
 
-    if (!(sg = virSCSIDeviceGetSgName(dev->source.subsys.u.scsi.adapter,
-                                      dev->source.subsys.u.scsi.bus,
-                                      dev->source.subsys.u.scsi.target,
-                                      dev->source.subsys.u.scsi.unit))) {
+    sg = (callbacks->qemuGetSCSIDeviceSgName)(dev->source.subsys.u.scsi.adapter,
+                                              dev->source.subsys.u.scsi.bus,
+                                              dev->source.subsys.u.scsi.target,
+                                              dev->source.subsys.u.scsi.unit);
+    if (!sg)
         goto error;
-    }
 
     virBufferAsprintf(&buf, "file=/dev/%s,if=none", sg);
     virBufferAsprintf(&buf, ",id=%s-%s",
@@ -6405,6 +6406,10 @@ qemuBuildGraphicsCommandLine(virQEMUDriverConfigPtr cfg,
     return 0;
 }
 
+qemuBuildCommandLineCallbacks buildCommandLineCallbacks = {
+    .qemuGetSCSIDeviceSgName = virSCSIDeviceGetSgName,
+};
+
 /*
  * Constructs a argv suitable for launching qemu with config defined
  * for a given virtual machine.
@@ -6422,7 +6427,8 @@ qemuBuildCommandLine(virConnectPtr conn,
                      const char *migrateFrom,
                      int migrateFd,
                      virDomainSnapshotObjPtr snapshot,
-                     enum virNetDevVPortProfileOp vmop)
+                     enum virNetDevVPortProfileOp vmop,
+                     qemuBuildCommandLineCallbacksPtr callbacks)
 {
     virErrorPtr originalError = NULL;
     int i, j;
@@ -8254,7 +8260,7 @@ qemuBuildCommandLine(virConnectPtr conn,
                 char *drvstr;
 
                 virCommandAddArg(cmd, "-drive");
-                if (!(drvstr = qemuBuildSCSIHostdevDrvStr(hostdev, qemuCaps)))
+                if (!(drvstr = qemuBuildSCSIHostdevDrvStr(hostdev, qemuCaps, callbacks)))
                     goto error;
                 virCommandAddArg(cmd, drvstr);
                 VIR_FREE(drvstr);
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 36dfa6b..133e0b2 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -51,6 +51,16 @@
 # define QEMU_WEBSOCKET_PORT_MIN  5700
 # define QEMU_WEBSOCKET_PORT_MAX  65535
 
+typedef struct _qemuBuildCommandLineCallbacks qemuBuildCommandLineCallbacks;
+typedef qemuBuildCommandLineCallbacks *qemuBuildCommandLineCallbacksPtr;
+struct _qemuBuildCommandLineCallbacks {
+    char * (*qemuGetSCSIDeviceSgName) (const char *adapter,
+                                       unsigned int bus,
+                                       unsigned int target,
+                                       unsigned int unit);
+};
+
+extern qemuBuildCommandLineCallbacks buildCommandLineCallbacks;
 
 virCommandPtr qemuBuildCommandLine(virConnectPtr conn,
                                    virQEMUDriverPtr driver,
@@ -61,8 +71,9 @@ virCommandPtr qemuBuildCommandLine(virConnectPtr conn,
                                    const char *migrateFrom,
                                    int migrateFd,
                                    virDomainSnapshotObjPtr current_snapshot,
-                                   enum virNetDevVPortProfileOp vmop)
-    ATTRIBUTE_NONNULL(1);
+                                   enum virNetDevVPortProfileOp vmop,
+                                   qemuBuildCommandLineCallbacksPtr callbacks)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(11);
 
 /* Generate string for arch-specific '-device' parameter */
 char *
@@ -142,7 +153,9 @@ char * qemuBuildUSBHostdevDevStr(virDomainHostdevDefPtr dev,
                                  virQEMUCapsPtr qemuCaps);
 
 char * qemuBuildSCSIHostdevDrvStr(virDomainHostdevDefPtr dev,
-                                  virQEMUCapsPtr qemuCaps);
+                                  virQEMUCapsPtr qemuCaps,
+                                  qemuBuildCommandLineCallbacksPtr callbacks)
+    ATTRIBUTE_NONNULL(3);
 char * qemuBuildSCSIHostdevDevStr(virDomainDefPtr def,
                                   virDomainHostdevDefPtr dev,
                                   virQEMUCapsPtr qemuCaps);
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 203cc6d..0665131 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5362,7 +5362,8 @@ static char *qemuConnectDomainXMLToNative(virConnectPtr conn,
 
     if (!(cmd = qemuBuildCommandLine(conn, driver, def,
                                      &monConfig, monitor_json, qemuCaps,
-                                     NULL, -1, NULL, VIR_NETDEV_VPORT_PROFILE_OP_NO_OP)))
+                                     NULL, -1, NULL, VIR_NETDEV_VPORT_PROFILE_OP_NO_OP,
+                                     &buildCommandLineCallbacks)))
         goto cleanup;
 
     ret = virCommandToString(cmd);
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index d037c9d..77d9f4f 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -1226,7 +1226,8 @@ qemuDomainAttachHostScsiDevice(virQEMUDriverPtr driver,
     if (qemuAssignDeviceHostdevAlias(vm->def, hostdev, 0) < 0)
         goto cleanup;
 
-    if (!(drvstr = qemuBuildSCSIHostdevDrvStr(hostdev, priv->qemuCaps)))
+    if (!(drvstr = qemuBuildSCSIHostdevDrvStr(hostdev, priv->qemuCaps,
+                                              &buildCommandLineCallbacks)))
         goto cleanup;
 
     if (!(devstr = qemuBuildSCSIHostdevDevStr(vm->def, hostdev, priv->qemuCaps)))
@@ -2543,7 +2544,8 @@ qemuDomainDetachHostScsiDevice(virQEMUDriverPtr driver,
         return -1;
     }
 
-    if (!(drvstr = qemuBuildSCSIHostdevDrvStr(detach, priv->qemuCaps)))
+    if (!(drvstr = qemuBuildSCSIHostdevDrvStr(detach, priv->qemuCaps,
+                                              &buildCommandLineCallbacks)))
         goto cleanup;
     if (!(devstr = qemuBuildSCSIHostdevDevStr(vm->def, detach, priv->qemuCaps)))
         goto cleanup;
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 4a7c612..95e712c 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3605,7 +3605,8 @@ int qemuProcessStart(virConnectPtr conn,
     VIR_DEBUG("Building emulator command line");
     if (!(cmd = qemuBuildCommandLine(conn, driver, vm->def, priv->monConfig,
                                      priv->monJSON, priv->qemuCaps,
-                                     migrateFrom, stdin_fd, snapshot, vmop)))
+                                     migrateFrom, stdin_fd, snapshot, vmop,
+                                     &buildCommandLineCallbacks)))
         goto cleanup;
 
     /* now that we know it is about to start call the hook if present */
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index d853308..e103925 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -82,6 +82,24 @@ typedef enum {
     FLAG_JSON               = 1 << 3,
 } virQemuXML2ArgvTestFlags;
 
+static char *
+testSCSIDeviceGetSgName(const char *adapter ATTRIBUTE_UNUSED,
+                        unsigned int bus ATTRIBUTE_UNUSED,
+                        unsigned int target ATTRIBUTE_UNUSED,
+                        unsigned int unit ATTRIBUTE_UNUSED)
+{
+    char *sg = NULL;
+
+    if (VIR_STRDUP(sg, "sg0") < 0)
+        return NULL;
+
+    return sg;
+}
+
+static qemuBuildCommandLineCallbacks testCallbacks = {
+    .qemuGetSCSIDeviceSgName = testSCSIDeviceGetSgName,
+};
+
 static int testCompareXMLToArgvFiles(const char *xml,
                                      const char *cmdline,
                                      virQEMUCapsPtr extraFlags,
@@ -157,7 +175,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
     if (!(cmd = qemuBuildCommandLine(conn, &driver, vmdef, &monitor_chr,
                                      (flags & FLAG_JSON), extraFlags,
                                      migrateFrom, migrateFd, NULL,
-                                     VIR_NETDEV_VPORT_PROFILE_OP_NO_OP))) {
+                                     VIR_NETDEV_VPORT_PROFILE_OP_NO_OP,
+                                     &testCallbacks))) {
         if (flags & FLAG_EXPECT_FAILURE) {
             ret = 0;
             if (virTestGetDebug() > 1)
diff --git a/tests/qemuxmlnstest.c b/tests/qemuxmlnstest.c
index 952b8e2..961405b 100644
--- a/tests/qemuxmlnstest.c
+++ b/tests/qemuxmlnstest.c
@@ -26,6 +26,24 @@
 static const char *abs_top_srcdir;
 static virQEMUDriver driver;
 
+static char *
+testSCSIDeviceGetSgName(const char *adapter ATTRIBUTE_UNUSED,
+                        unsigned int bus ATTRIBUTE_UNUSED,
+                        unsigned int target ATTRIBUTE_UNUSED,
+                        unsigned int unit ATTRIBUTE_UNUSED)
+{
+    char *sg = NULL;
+
+    if (VIR_STRDUP(sg, "dummy") < 0)
+        return NULL;
+
+    return sg;
+}
+
+static qemuBuildCommandLineCallbacks testCallbacks = {
+    .qemuGetSCSIDeviceSgName = testSCSIDeviceGetSgName,
+};
+
 static int testCompareXMLToArgvFiles(const char *xml,
                                      const char *cmdline,
                                      virQEMUCapsPtr extraFlags,
@@ -113,7 +131,8 @@ static int testCompareXMLToArgvFiles(const char *xml,
     if (!(cmd = qemuBuildCommandLine(conn, &driver,
                                      vmdef, &monitor_chr, json, extraFlags,
                                      migrateFrom, migrateFd, NULL,
-                                     VIR_NETDEV_VPORT_PROFILE_OP_NO_OP)))
+                                     VIR_NETDEV_VPORT_PROFILE_OP_NO_OP,
+                                     &testCallbacks)))
         goto fail;
 
     if (!!virGetLastError() != expectError) {
-- 
1.8.1.4

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