Check if qemu-img is present before startup

virtweb_backend/src/utils/exec_utils.rs

@@ -0,0 +1,10 @@
+use std::path::Path;
+
+/// Check the existence of a required program
+pub fn check_program(name: &str, description: &str) {
+    let path = Path::new(name);
+
+    if !path.exists() {
+        panic!("{name} does not exist! {description}");
+    }
+}

virtweb_backend/src/utils/file_disks_utils.rs

@@ -155,7 +155,7 @@ impl FileDisk {
             }
 
             DiskFormat::QCow2 => {
-                let mut cmd = Command::new("/usr/bin/qemu-img");
+                let mut cmd = Command::new(constants::QEMU_IMAGE_PROGRAM);
                 cmd.arg("create")
                     .arg("-f")
                     .arg("qcow2")
@@ -189,12 +189,13 @@ struct QCowInfoOutput {
 /// Get QCow2 virtual size
 fn qcow_virt_size(path: &str) -> anyhow::Result<usize> {
     // Run qemu-img
-    let mut cmd = Command::new("qemu-img");
+    let mut cmd = Command::new(constants::QEMU_IMAGE_PROGRAM);
     cmd.args(["info", path, "--output", "json", "--force-share"]);
     let output = cmd.output()?;
     if !output.status.success() {
         anyhow::bail!(
-            "qemu-img info failed, status: {}, stderr: {}",
+            "{} info failed, status: {}, stderr: {}",
+            constants::QEMU_IMAGE_PROGRAM,
             output.status,
             String::from_utf8_lossy(&output.stderr)
         );

virtweb_backend/src/utils/mod.rs

@@ -1,3 +1,4 @@
+pub mod exec_utils;
 pub mod file_disks_utils;
 pub mod files_utils;
 pub mod net_utils;