[pve-devel] [PATCH installer v4 12/30] auto-installer: add simple logging

[Aaron Lauterer <a.lauterer@proxmox.com>]

Log to stdout and the file the binary needs to set up.

This is a first variant. By using the log crate macros we can change
that in the future without too much effort.

Signed-off-by: Aaron Lauterer <a.lauterer@proxmox.com>
---
 proxmox-auto-installer/Cargo.toml |  2 ++
 proxmox-auto-installer/src/lib.rs |  1 +
 proxmox-auto-installer/src/log.rs | 38 +++++++++++++++++++++++++++++++
 3 files changed, 41 insertions(+)
 create mode 100644 proxmox-auto-installer/src/log.rs

diff --git a/proxmox-auto-installer/Cargo.toml b/proxmox-auto-installer/Cargo.toml
index 80de4fa..b1d3e7a 100644
--- a/proxmox-auto-installer/Cargo.toml
+++ b/proxmox-auto-installer/Cargo.toml
@@ -8,8 +8,10 @@ exclude = [ "build", "debian" ]
 homepage = "https://www.proxmox.com"
 
 [dependencies]
+anyhow = "1.0"
 proxmox-installer-common = { path = "../proxmox-installer-common" }
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 toml = "0.7"
 enum-iterator = "0.6.0"
+log = "0.4.20"
diff --git a/proxmox-auto-installer/src/lib.rs b/proxmox-auto-installer/src/lib.rs
index 72884c1..6636cc7 100644
--- a/proxmox-auto-installer/src/lib.rs
+++ b/proxmox-auto-installer/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod answer;
+pub mod log;
 pub mod udevinfo;
 pub mod utils;
diff --git a/proxmox-auto-installer/src/log.rs b/proxmox-auto-installer/src/log.rs
new file mode 100644
index 0000000..d52912a
--- /dev/null
+++ b/proxmox-auto-installer/src/log.rs
@@ -0,0 +1,38 @@
+use anyhow::{bail, Result};
+use log::{Level, Metadata, Record};
+use std::{fs::File, io::Write, sync::Mutex, sync::OnceLock};
+
+pub struct AutoInstLogger;
+static LOGFILE: OnceLock<Mutex<File>> = OnceLock::new();
+
+impl AutoInstLogger {
+    pub fn init(path: &str) -> Result<()> {
+        let f = File::create(path)?;
+        if LOGFILE.set(Mutex::new(f)).is_err() {
+            bail!("Cannot set LOGFILE")
+        }
+        Ok(())
+    }
+}
+
+impl log::Log for AutoInstLogger {
+    fn enabled(&self, metadata: &Metadata) -> bool {
+        metadata.level() <= Level::Info
+    }
+
+    /// Logs to stdout without log level and into log file including log level
+    fn log(&self, record: &Record) {
+        if self.enabled(record.metadata()) {
+            println!("{}", record.args());
+            let mut file = LOGFILE
+                .get()
+                .expect("could not get LOGFILE")
+                .lock()
+                .expect("could not get mutex for LOGFILE");
+            file.write_all(format!("{} - {}\n", record.level(), record.args()).as_bytes())
+                .expect("could not write to LOGFILE");
+        }
+    }
+
+    fn flush(&self) {}
+}
-- 
2.39.2