install/bootloader: make --write-uuid optional

Allow skiping the boot uuid stamp file writing in bootupd. When creating
a golden image, we expect the UUIDS to be randomized at first boot, so
always writing the stamp is odd.
At least for Fedora CoreOS the stamp being already there at first boot
short-circuit the partitions uuid randomization process. So let's make
it optionnal. It will default to `false`, preserving existing behaviour
when not specified.

ref coreos/fedora-coreos-config#3898

Assisted-by: OpenCode (Opus 4.5)
Signed-off-by: jbtrystram <jbtrystram@redhat.com>

Author: jbtrystram

crates/lib/src/bootloader.rs

@@ -105,7 +105,12 @@ pub(crate) fn install_via_bootupd(
     println!("Installing bootloader via bootupd");
 
     // Build the bootupctl arguments
-    let mut bootupd_args: Vec<&str> = vec!["backend", "install", "--write-uuid"];
+    let mut bootupd_args: Vec<&str> = vec!["backend", "install"];
+    if configopts.bootupd_skip_boot_uuid {
+        bootupd_args.push("--with-static-configs")
+    } else {
+        bootupd_args.push("--write-uuid");
+    }
     if let Some(v) = verbose {
         bootupd_args.push(v);
     }

crates/lib/src/install.rs

@@ -368,6 +368,11 @@ pub(crate) struct InstallConfigOpts {
     /// The stateroot name to use. Defaults to `default`.
     #[clap(long)]
     pub(crate) stateroot: Option<String>,
+
+    /// Don't pass --write-uuid to bootupd during bootloader installation.
+    #[clap(long)]
+    #[serde(default)]
+    pub(crate) bootupd_skip_boot_uuid: bool,
 }
 
 #[derive(Debug, Default, Clone, clap::Parser, Serialize, Deserialize, PartialEq, Eq)]