Ensure /dev is mounted before losetup is called

Not a race condition, but more of a timing issue. Just needed to make
sure the /dev mount was happening before any of the losetup calls.

Fixes #352

Signed-off-by: Brad P. Crochet <brad@redhat.com>

rh-pre-commit.version: 2.2.0
rh-pre-commit.check-secrets: ENABLED

lib/src/install.rs

@@ -58,6 +58,9 @@ const SELINUXFS: &str = "/sys/fs/selinux";
 #[cfg(feature = "install")]
 const EFIVARFS: &str = "/sys/firmware/efi/efivars";
 pub(crate) const ARCH_USES_EFI: bool = cfg!(any(target_arch = "x86_64", target_arch = "aarch64"));
+/// The mount path for devtmpfs
+#[cfg(feature = "install")]
+const DEVTMPFS: &str = "/dev";
 
 /// Kernel argument used to specify we want the rootfs mounted read-write by default
 const RW_KARG: &str = "rw";
@@ -1076,6 +1079,14 @@ async fn prepare_install(
         super::cli::ensure_self_unshared_mount_namespace().await?;
     }
 
+    // We need to ensure that /dev is mounted before we get to any losetup tasks
+    for (fstype, fspath) in [("devtmpfs", DEVTMPFS)] {
+        let _ = Task::new(format!("Mounting {fstype} {fspath}"), "mount")
+            .args(["-t", fstype, fstype, fspath])
+            .quiet()
+            .run();
+    }
+
     setup_sys_mount("efivarfs", EFIVARFS)?;
 
     // Now, deal with SELinux state.