qrap: Support JSON syntax for -device

Starting with version 8.1.0, libvirt uses JSON syntax when
generating the arguments to -device, so they will now look like

  {"driver":"virtio-scsi-pci","bus":"pci.3","addr":"0x0"}

instead of

  virtio-scsi-pci,bus=pci.3,addr=0x0

qrap needs to parse these arguments and extract the bus number
in order to figure out what address to use for the virtio-net
device it adds, and the libvirt change described above has
broken this parsing logic.

Tweak the code so that both styles are accepted and handled
correctly.

Note that, when JSON is in use, qrap needs to generate its own
command line options in that format as well or things will not
work as expected.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 41 insertions, 10 deletions

diff --git a/qrap.c b/qrap.c
index a9a0fc1..3c6f5b8 100644
--- a/qrap.c
+++ b/qrap.c
@@ -69,6 +69,8 @@ static const struct drop_arg {
  * @name:		Device ("-device") name to insert
  * @template:		Prefix for device specification (first part of address)
  * @template_post:	Suffix for device specification (last part of address)
+ * @template_json:		Device prefix for when JSON is used
+ * @template_json_post:	Device suffix for when JSON is used
  * @first:		First usable PCI address
  * @last:		Last usable PCI address
  */
@@ -77,15 +79,29 @@ static const struct pci_dev {
 	char *name;
 	char *template;
 	char *template_post;
+	char *template_json;
+	char *template_json_post;
 	int first;
 	int last;
 } pci_devs[] = {
-	{ "pc-q35",	"virtio-net-pci",
-		"bus=pci.", ",addr=0x0",	3, /* 2: hotplug bus */	16 },
-	{ "pc-",	"virtio-net-pci",
-		"bus=pci.0,addr=0x", "",	2, /* 1: ISA bridge */	16 },
-	{ "s390-ccw",	"virtio-net-ccw",
-		"devno=fe.0.", "",		1,			16 },
+	{
+		"pc-q35", "virtio-net-pci",
+		"bus=pci.", ",addr=0x0",
+		"\"bus\":\"pci.", ",\"addr\":\"0x0\"",
+		3, /* 2: hotplug bus */ 16
+	},
+	{
+		"pc-", "virtio-net-pci",
+		"bus=pci.0,addr=0x", "",
+		"\"bus\":\"pci.0\",\"addr=0x", "",
+		2, /* 1: ISA bridge */ 16
+	},
+	{
+		"s390-ccw", "virtio-net-ccw",
+		"devno=fe.0.", "",
+		"\"devno\":\"fe.0.", "",
+		1, 16
+	},
 	{ 0 },
 };
 
@@ -115,7 +131,7 @@ void usage(const char *name)
  */
 int main(int argc, char **argv)
 {
-	int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0, retry_on_reset, rc;
+	int i, s, qemu_argc = 0, addr_map = 0, has_dev = 0, has_json = 0, retry_on_reset, rc;
 	struct timeval tv = { .tv_sec = 0, .tv_usec = (long)(500 * 1000) };
 	char *qemu_argv[ARG_MAX], dev_str[ARG_MAX];
 	struct sockaddr_un addr = {
@@ -227,14 +243,22 @@ int main(int argc, char **argv)
 		}
 
 		if (!strcmp(argv[i], "-device") && i + 1 < argc) {
+			char *template = NULL;
 			char *p;
 
 			has_dev = 1;
 
 			if ((p = strstr(argv[i + 1], dev->template))) {
+				template = dev->template;
+			} else if ((p = strstr(argv[i + 1], dev->template_json))) {
+				template = dev->template_json;
+				has_json = 1;
+			}
+
+			if (template) {
 				long n;
 
-				n = strtol(p + strlen(dev->template), NULL, 16);
+				n = strtol(p + strlen(template), NULL, 16);
 				if (!errno)
 					addr_map |= (1 << n);
 			}
@@ -254,8 +278,15 @@ int main(int argc, char **argv)
 
 	if (has_dev) {
 		qemu_argv[qemu_argc++] = "-device";
-		snprintf(dev_str, ARG_MAX, "%s,%s%x%s,netdev=hostnet0,x-txburst=4096",
-			 dev->name, dev->template, i, dev->template_post);
+		if (!has_json) {
+			snprintf(dev_str, ARG_MAX,
+			         "%s,%s%x%s,netdev=hostnet0,x-txburst=4096",
+			         dev->name, dev->template, i, dev->template_post);
+		} else {
+			snprintf(dev_str, ARG_MAX,
+			         "{\"driver\":\"%s\",%s%x\"%s,\"netdev\":\"hostnet0\",\"x-txburst\":4096}",
+			         dev->name, dev->template_json, i, dev->template_json_post);
+		}
 		qemu_argv[qemu_argc++] = dev_str;
 	}