[libvirt] [PATCH v2 2/2] check compression program is available at config

[KAMEZAWA Hiroyuki]

At compression, external programs are used but it is not checked whether
the program is available or not.
Check it at parsing qemu.conf and find problems in early stage.

---
 src/qemu/qemu_conf.c |   46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

Index: libvirt-0.8.4/src/qemu/qemu_conf.c
===================================================================
--- libvirt-0.8.4.orig/src/qemu/qemu_conf.c
+++ libvirt-0.8.4/src/qemu/qemu_conf.c
@@ -316,22 +316,54 @@ int qemudLoadDriverConfig(struct qemud_d
     p = virConfGetValue (conf, "save_image_format");
     CHECK_TYPE ("save_image_format", VIR_CONF_STRING);
     if (p && p->str) {
-        VIR_FREE(driver->saveImageFormat);
-        if (!(driver->saveImageFormat = strdup(p->str))) {
-            virReportOOMError();
-            virConfFree(conf);
-            return -1;
-        }
+	int find = 1;
+	if (strcmp(p->str, "raw")) {
+	    char *c;
+	    c = virFindFileInPath(p->str);
+	    if (!c)
+	        find = 0;
+	    else
+	      VIR_FREE(c);
+	}
+	VIR_FREE(driver->saveImageFormat);
+	if (find) {
+            if (!(driver->saveImageFormat = strdup(p->str))) {
+	        virReportOOMError();
+		virConfFree(conf);
+		return -1;
+	    }
+	} else {
+	    qemuReportError(VIR_ERR_INTERNAL_ERROR,
+                    "save_image_format cannot find program %s", p->str);
+	    virConfFree(conf);
+	    return -1;
+	}
     }
 
     p = virConfGetValue (conf, "dump_image_format");
     CHECK_TYPE ("dump_image_format", VIR_CONF_STRING);
     if (p && p->str) {
+	int find = 1;
+	if (strcmp(p->str, "raw")) {
+            char *c;
+	    c = virFindFileInPath(p->str);
+	    if (!c)
+	        find = 0;
+	    else
+	        VIR_FREE(c);
+	}
 	VIR_FREE(driver->dumpImageFormat);
-	if (!(driver->dumpImageFormat = strdup(p->str))) {
+	if (find) {
+	    if (!(driver->dumpImageFormat = strdup(p->str))) {
 		virReportOOMError();
 		virConfFree(conf);
 		return -1;
+	    }
+	} else {
+	    qemuReportError(VIR_ERR_INTERNAL_ERROR,
+                    "dump_image_format cannot find program %s", p->str);
+	    virConfFree(conf);
+	    return -1;
 	}
     }