lohr: add default and additional remotes

Co-authored-by: Antoine Martin <antoine@alarsyo.net>

Cargo.lock

@@ -231,6 +231,12 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "dtoa"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
+
 [[package]]
 name = "filetime"
 version = "0.2.14"
@@ -459,6 +465,12 @@ version = "0.2.91"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8916b1f6ca17130ec6568feccee27c156ad12037880833a3b842a823236502e7"
 
+[[package]]
+name = "linked-hash-map"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
+
 [[package]]
 name = "log"
 version = "0.3.9"
@@ -486,6 +498,7 @@ dependencies = [
  "rocket",
  "rocket_contrib",
  "serde",
+ "serde_yaml",
 ]
 
 [[package]]
@@ -851,6 +864,18 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.8.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15654ed4ab61726bf918a39cb8d98a2e2995b002387807fa6ba58fdf7f59bb23"
+dependencies = [
+ "dtoa",
+ "linked-hash-map",
+ "serde",
+ "yaml-rust",
+]
+
 [[package]]
 name = "sha2"
 version = "0.9.3"
@@ -1104,6 +1129,15 @@ dependencies = [
  "winapi-build",
 ]
 
+[[package]]
+name = "yaml-rust"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map",
+]
+
 [[package]]
 name = "yansi"
 version = "0.5.0"

Cargo.toml

@@ -14,3 +14,4 @@ log = "0.4.14"
 rocket = "0.4.7"
 rocket_contrib = { version = "0.4.7", features = [ "json" ] }
 serde = { version = "1.0.125", features = [ "derive" ] }
+serde_yaml = "0.8.17"

src/job.rs

@@ -8,6 +8,7 @@ use anyhow::bail;
 use log::info;
 
 use crate::gitea::Repository;
+use crate::settings::{GlobalSettings, RepoUrl};
 
 pub(crate) struct Job {
     repo: Repository,
@@ -91,7 +92,9 @@ impl Job {
         Ok(())
     }
 
-    fn get_remotes(&self) -> anyhow::Result<String> {
+    /// Can return Ok(None) if the .lohr file didn't exist, but no significant error occured
+    fn read_remotes_from_lohr_file(&self) -> anyhow::Result<Option<Vec<RepoUrl>>> {
+        // try to read .lohr file from bare repo (hence the git show sorcery)
         let output = Command::new("git")
             .arg("-C")
             .arg(format!("{}", self.local_path.as_ref().unwrap().display()))
@@ -101,24 +104,56 @@ impl Job {
 
         if !output.status.success() {
             let error = str::from_utf8(&output.stderr)?;
-            let code = output
-                .status
-                .code()
-                .unwrap_or_else(|| output.status.signal().unwrap());
 
-            bail!(
-                "couldn't read .lohr file from repo {}: exit code {}, stderr:\n{}",
-                self.repo.full_name,
-                code,
-                error
-            );
+            // this error case is okay, .lohr just doesn't exist
+            if error.contains("does not exist in 'HEAD'") {
+                return Ok(None);
+            } else {
+                let code = output
+                    .status
+                    .code()
+                    .unwrap_or_else(|| output.status.signal().unwrap());
+
+                bail!(
+                    "couldn't read .lohr file from repo {}: exit code {}, stderr:\n{}",
+                    self.repo.full_name,
+                    code,
+                    error
+                );
+            }
         }
 
-        Ok(String::from_utf8(output.stdout)?)
+        let output = String::from_utf8(output.stdout)?;
+
+        Ok(Some(output.lines().map(String::from).collect()))
     }
 
-    fn update_mirrors(&self) -> anyhow::Result<()> {
-        for remote in self.get_remotes()?.lines() {
+    fn get_remotes(&self, config: &GlobalSettings) -> anyhow::Result<Vec<RepoUrl>> {
+        let local_path = self.local_path.as_ref().unwrap();
+
+        let stem_to_repo = |stem: &RepoUrl| -> RepoUrl {
+            let mut res = stem.clone();
+            if !res.ends_with('/') {
+                res.push('/');
+            };
+            res.push_str(local_path.file_name().unwrap().to_str().unwrap());
+            res
+        };
+
+        // use either .lohr file or default remotes from config
+        let mut remotes = match self.read_remotes_from_lohr_file()? {
+            Some(remotes) if !remotes.is_empty() => remotes,
+            _ => config.default_remotes.iter().map(stem_to_repo).collect(),
+        };
+
+        // additional remotes
+        remotes.append(&mut config.additional_remotes.iter().map(stem_to_repo).collect());
+
+        Ok(remotes)
+    }
+
+    fn update_mirrors(&self, config: &GlobalSettings) -> anyhow::Result<()> {
+        for remote in &self.get_remotes(config)? {
             info!("Updating mirror {}:{}...", remote, self.repo.full_name);
 
             let output = Command::new("git")
@@ -148,7 +183,7 @@ impl Job {
         Ok(())
     }
 
-    pub(crate) fn run(&mut self, homedir: &Path) -> anyhow::Result<()> {
+    pub(crate) fn run(&mut self, homedir: &Path, config: &GlobalSettings) -> anyhow::Result<()> {
         let local_path = homedir.join(&self.repo.full_name);
         assert!(local_path.is_absolute());
         self.local_path = Some(local_path);

src/main.rs

@@ -1,6 +1,7 @@
 #![feature(proc_macro_hygiene, decl_macro)]
 
 use std::env;
+use std::fs::File;
 use std::path::PathBuf;
 use std::sync::{
     mpsc::{channel, Receiver, Sender},
@@ -19,6 +20,9 @@ use gitea::GiteaWebHook;
 mod job;
 use job::Job;
 
+mod settings;
+use settings::GlobalSettings;
+
 struct JobSender(Mutex<Sender<Job>>);
 
 #[post("/", data = "<payload>")]
@@ -34,29 +38,44 @@ fn gitea_webhook(payload: Json<GiteaWebHook>, sender: State<JobSender>) -> Statu
     Status::Ok
 }
 
-fn repo_updater(rx: Receiver<Job>, homedir: PathBuf) {
+fn repo_updater(rx: Receiver<Job>, homedir: PathBuf, config: GlobalSettings) {
     loop {
         let mut job = rx.recv().unwrap();
 
-        if let Err(err) = job.run(&homedir) {
+        if let Err(err) = job.run(&homedir, &config) {
             error!("couldn't process job: {}", err);
         }
     }
 }
 
-fn main() {
+fn parse_config(mut path: PathBuf) -> anyhow::Result<GlobalSettings> {
+    path.push("lohr-config");
+    path.set_extension("yaml");
+    let config = if let Ok(file) = File::open(path.as_path()) {
+        serde_yaml::from_reader(file)?
+    } else {
+        Default::default()
+    };
+    Ok(config)
+}
+
+fn main() -> anyhow::Result<()> {
     let (sender, receiver) = channel();
 
     let homedir = env::var("LOHR_HOME").unwrap_or_else(|_| "./".to_string());
     let homedir: PathBuf = homedir.into();
     let homedir = homedir.canonicalize().expect("LOHR_HOME isn't valid!");
 
+    let config = parse_config(homedir.clone())?;
+
     thread::spawn(move || {
-        repo_updater(receiver, homedir);
+        repo_updater(receiver, homedir, config);
     });
 
     rocket::ignite()
         .mount("/", routes![gitea_webhook])
         .manage(JobSender(Mutex::new(sender)))
         .launch();
+
+    Ok(())
 }

src/settings.rs

@@ -0,0 +1,13 @@
+use serde::Deserialize;
+
+pub(crate) type RepoUrl = String; // FIXME: probably needs a better type than this
+
+#[derive(Default, Deserialize)]
+pub(crate) struct GlobalSettings {
+    /// List of remote stems to use when no `.lohr` file is found
+    #[serde(default)]
+    pub default_remotes: Vec<RepoUrl>,
+    /// List of remote stems to use for every repository
+    #[serde(default)]
+    pub additional_remotes: Vec<RepoUrl>,
+}