initialize logging when shared library is loaded

This commit sets up logging by hooking into module loading/bootstraping
process to call a new `init` function exported by the `Proxmox::Lib::{PVE,PMG}`
module, which initializes `env_logger` with its default settings.

This allows us to use `log::*` macros from Rust code.

Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>

Proxmox/Lib/template.pm

@@ -66,6 +66,10 @@ sub bootstrap {
     $boot->();
 }
 
-BEGIN { __PACKAGE__->load(); }
+BEGIN {
+    __PACKAGE__->load();
+    __PACKAGE__->bootstrap();
+    init();
+}
 
 1;

common/src/logger.rs

@@ -0,0 +1,6 @@
+/// Initialize logging. Should only be called once
+pub fn init() {
+    if let Err(e) = env_logger::try_init() {
+        eprintln!("could not set up env_logger: {e}");
+    }
+}

common/src/mod.rs

@@ -1,3 +1,4 @@
 pub mod apt;
 mod calendar_event;
+pub mod logger;
 mod subscription;

pmg-rs/Cargo.toml

@@ -20,6 +20,7 @@ crate-type = [ "cdylib" ]
 
 [dependencies]
 anyhow = "1.0"
+env_logger = "0.9"
 hex = "0.4"
 http = "0.2.7"
 libc = "0.2"

pmg-rs/src/lib.rs

@@ -5,3 +5,13 @@ pub mod acme;
 pub mod apt;
 pub mod csr;
 pub mod tfa;
+
+#[perlmod::package(name = "Proxmox::Lib::PMG", lib = "pmg_rs")]
+mod export {
+    use crate::common;
+
+    #[export]
+    pub fn init() {
+        common::logger::init();
+    }
+}

pve-rs/Cargo.toml

@@ -18,6 +18,7 @@ crate-type = [ "cdylib" ]
 anyhow = "1.0"
 base32 = "0.4"
 base64 = "0.13"
+env_logger = "0.9"
 hex = "0.4"
 http = "0.2.7"
 libc = "0.2"

pve-rs/src/lib.rs

@@ -7,3 +7,13 @@ pub mod apt;
 pub mod openid;
 pub mod resource_scheduling;
 pub mod tfa;
+
+#[perlmod::package(name = "Proxmox::Lib::PVE", lib = "pve_rs")]
+mod export {
+    use crate::common;
+
+    #[export]
+    pub fn init() {
+        common::logger::init();
+    }
+}