monitor: detect that eject fails because the tray is locked

Modify the eject monitor functions to parse the return code and detect,
whether the error contains "is locked" to report this type of failure to
upper layers.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

src/qemu/qemu_monitor_json.c

@@ -44,6 +44,7 @@
 #include "virprobe.h"
 #include "virstring.h"
 #include "cpu/cpu_x86.h"
+#include "c-strcasestr.h"
 
 #ifdef WITH_DTRACE_PROBES
 # include "libvirt_qemu_probes.h"
@@ -2180,6 +2181,14 @@ int qemuMonitorJSONSetCPU(qemuMonitorPtr mon,
 }
 
 
+/**
+ * Run QMP command to eject a media from ejectable device.
+ *
+ * Returns:
+ *      -2 on error, when the tray is locked
+ *      -1 on all other errors
+ *      0 on success
+ */
 int qemuMonitorJSONEjectMedia(qemuMonitorPtr mon,
                               const char *dev_name,
                               bool force)
@@ -2198,6 +2207,11 @@ int qemuMonitorJSONEjectMedia(qemuMonitorPtr mon,
     if (ret == 0)
         ret = qemuMonitorJSONCheckError(cmd, reply);
 
+    VIR_DEBUG("%s", virJSONValueToString(reply, false));
+
+    if (ret < 0 && c_strcasestr(virJSONValueToString(reply, false), "is locked"))
+        ret = -2;
+
     virJSONValueFree(cmd);
     virJSONValueFree(reply);
     return ret;

src/qemu/qemu_monitor_text.c

@@ -1169,6 +1169,14 @@ int qemuMonitorTextSetCPU(qemuMonitorPtr mon, int cpu, bool online)
 }
 
 
+/**
+ * Run HMP command to eject a media from ejectable device.
+ *
+ * Returns:
+ *      -2 on error, when the tray is locked
+ *      -1 on all other errors
+ *      0 on success
+ */
 int qemuMonitorTextEjectMedia(qemuMonitorPtr mon,
                               const char *dev_name,
                               bool force)
@@ -1187,6 +1195,8 @@ int qemuMonitorTextEjectMedia(qemuMonitorPtr mon,
      * device not found, device is locked ...
      * No message is printed on success it seems */
     if (c_strcasestr(reply, "device ")) {
+        if (c_strcasestr(reply, "is locked"))
+            ret = -2;
         virReportError(VIR_ERR_OPERATION_FAILED,
                        _("could not eject media on %s: %s"), dev_name, reply);
         goto cleanup;