--- a/src/command.rs	Sun Nov 22 17:42:50 2020 +0900
+++ b/src/command.rs	Sun Nov 22 17:50:18 2020 +0900
@@ -55,8 +55,7 @@
         }
     };
     virsh::command_require_vm_name(&xml_path, "define");
-    let vm_path = format!("{}{}.qcow2", RENTAL_DIR, &vm_name);
-    virsh::generate_qemu_from_template(&vm_path, &backing_path);
+    virsh::generate_qemu_from_template(RENTAL_DIR, &vm_name, &backing_path);
 }
 
 pub fn start(user_name: &str, vm_name: &str) {

--- a/src/virsh.rs	Sun Nov 22 17:42:50 2020 +0900
+++ b/src/virsh.rs	Sun Nov 22 17:50:18 2020 +0900
@@ -1,6 +1,7 @@
 use std::io::{self, Write};
 use std::process::Command;
 
+use std::env;
 use std::fs;
 use std::path::Path;
 
@@ -68,9 +69,13 @@
     io::stderr().write_all(&output.stderr).unwrap();
 }
 
-pub fn generate_qemu_from_template(vm_path: &str, template_path: &str) {
-    //let vm_path = format!("{}{}{}", rental_dir, &vm_name, TEMPLATE_FILE_EXTENSION);
-    //$qemu-img create -F qcow2 -b ibm-master.qcow2 -f qcow2 ibm-02.qcow2
+pub fn generate_qemu_from_template(vm_path_string: &str, vm_name: &str, template_path: &str) {
+    let vm_path = Path::new(&vm_path_string);
+    let ok = env::set_current_dir(&vm_path);
+    if ok.is_err() {
+        println!("failed cd at {}", &vm_path_string);
+        return;
+    }
     let output = Command::new("qemu-img")
         .arg("create")
         .arg("-F")
@@ -79,9 +84,9 @@
         .arg(template_path)
         .arg("-f")
         .arg(QCOW2)
-        .arg(vm_path)
+        .arg(vm_name)
         .output()
-        .unwrap_or_else(|_| panic!("failed to generate {}", &vm_path));
+        .unwrap_or_else(|_| panic!("failed to generate {}", &vm_name));
     io::stdout().write_all(&output.stdout).unwrap();
     io::stderr().write_all(&output.stderr).unwrap();
 }