[PATCH] kvmtool/run: append cfg.kernel_cmdline at the end of real_cmdline

[Oleg Nesterov <oleg@redhat.com>]

This allows the user to always override the paramaters set by lkvm.
Say, currently 'lkvm run -p ro' doesn't work.

To keep the current logic we need to change strstr("root=") to check
cfg.kernel_cmdline, not real_cmdline. And perhaps we can even add a
simple helper add_param(name, val) to make this all more consistent;
it should only append "name=val" to real_cmdline if cfg.kernel_cmdline
doesn't include this paramater.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 builtin-run.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/builtin-run.c b/builtin-run.c
index 3da00da..ab1fc2a 100644
--- a/builtin-run.c
+++ b/builtin-run.c
@@ -566,12 +566,6 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 	memset(real_cmdline, 0, sizeof(real_cmdline));
 	kvm__arch_set_cmdline(real_cmdline, kvm->cfg.vnc || kvm->cfg.sdl || kvm->cfg.gtk);
 
-	if (strlen(real_cmdline) > 0)
-		strcat(real_cmdline, " ");
-
-	if (kvm->cfg.kernel_cmdline)
-		strlcat(real_cmdline, kvm->cfg.kernel_cmdline, sizeof(real_cmdline));
-
 	if (!kvm->cfg.guest_name) {
 		if (kvm->cfg.custom_rootfs) {
 			kvm->cfg.guest_name = kvm->cfg.custom_rootfs_name;
@@ -611,10 +605,15 @@ static struct kvm *kvm_cmd_run_init(int argc, const char **argv)
 			if (kvm_setup_guest_init(kvm->cfg.custom_rootfs_name))
 				die("Failed to setup init for guest.");
 		}
-	} else if (!strstr(real_cmdline, "root=")) {
+	} else if (!strstr(kvm->cfg.kernel_cmdline, "root=")) {
 		strlcat(real_cmdline, " root=/dev/vda rw ", sizeof(real_cmdline));
 	}
 
+	if (kvm->cfg.kernel_cmdline) {
+		strcat(real_cmdline, " ");
+		strlcat(real_cmdline, kvm->cfg.kernel_cmdline, sizeof(real_cmdline));
+	}
+
 	kvm->cfg.real_cmdline = real_cmdline;
 
 	printf("  # %s run -k %s -m %Lu -c %d --name %s\n", KVM_BINARY_NAME,
-- 
2.4.3