[pbs-devel] [PATCH proxmox 1/2] acme-api: use inner mutability for ACME_ACME_CONFIG

[Shannon Sterz]

in edition 2024 references to mutable static will be disallowed [1]. the
recommended way around this is to use types with inner mutability. so
use a `OnceLock` for `ACME_ACME_CONFIG` as the directoryfor ACME
configuration purposes shouldn't change throughout the run time of an
application.

[1]:
https://doc.rust-lang.org/nightly/edition-guide/rust-2024/static-mut-references.html

Signed-off-by: Shannon Sterz <s.sterz at proxmox.com>
---
 proxmox-acme-api/src/init.rs | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/proxmox-acme-api/src/init.rs b/proxmox-acme-api/src/init.rs
index a5287a8e..5dcf048c 100644
--- a/proxmox-acme-api/src/init.rs
+++ b/proxmox-acme-api/src/init.rs
@@ -1,26 +1,28 @@
 use std::path::{Path, PathBuf};
+use std::sync::OnceLock;
 
 use anyhow::Error;
 
 use proxmox_product_config::create_secret_dir;
 
+#[derive(Debug)]
 struct AcmeApiConfig {
     acme_config_dir: PathBuf,
     acme_account_dir: PathBuf,
 }
 
-static mut ACME_ACME_CONFIG: Option<AcmeApiConfig> = None;
+static ACME_ACME_CONFIG: OnceLock<AcmeApiConfig> = OnceLock::new();
 
 /// Initialize the global product configuration.
 pub fn init<P: AsRef<Path>>(acme_config_dir: P, create_subdirs: bool) -> Result<(), Error> {
     let acme_config_dir = acme_config_dir.as_ref().to_owned();
 
-    unsafe {
-        ACME_ACME_CONFIG = Some(AcmeApiConfig {
+    ACME_ACME_CONFIG
+        .set(AcmeApiConfig {
             acme_account_dir: acme_config_dir.join("accounts"),
             acme_config_dir,
-        });
-    }
+        })
+        .expect("cannot set acme configuration twice");
 
     if create_subdirs {
         create_secret_dir(self::acme_config_dir(), false)?;
@@ -31,11 +33,9 @@ pub fn init<P: AsRef<Path>>(acme_config_dir: P, create_subdirs: bool) -> Result<
 }
 
 fn acme_api_config() -> &'static AcmeApiConfig {
-    unsafe {
-        ACME_ACME_CONFIG
-            .as_ref()
-            .expect("ProxmoxProductConfig is not initialized!")
-    }
+    ACME_ACME_CONFIG
+        .get()
+        .expect("ProxmoxProductConfig is not initialized!")
 }
 
 fn acme_config_dir() -> &'static Path {
-- 
2.39.5