Use empty tmp folder for searching for templates

Cargo.lock

@@ -521,6 +521,12 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "fuchsia-cprng"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
+
 [[package]]
 name = "futures"
 version = "0.3.28"
@@ -1369,7 +1375,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "5d5285893bb5eb82e6aaf5d59ee909a06a16737a8970984dd7746ba9283498d6"
 dependencies = [
  "phf_shared",
- "rand",
+ "rand 0.8.5",
 ]
 
 [[package]]
@@ -1431,6 +1437,19 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "rand"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "552840b97013b1a26992c11eac34bdd778e464601a4c2054b5f0bff7c6761293"
+dependencies = [
+ "fuchsia-cprng",
+ "libc",
+ "rand_core 0.3.1",
+ "rdrand",
+ "winapi",
+]
+
 [[package]]
 name = "rand"
 version = "0.8.5"
@@ -1439,7 +1458,7 @@ checksum = "34af8d1a0e25924bc5b7c43c079c942339d8f0a8b57c39049bef581b46327404"
 dependencies = [
  "libc",
  "rand_chacha",
- "rand_core",
+ "rand_core 0.6.4",
 ]
 
 [[package]]
@@ -1449,9 +1468,24 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
- "rand_core",
+ "rand_core 0.6.4",
 ]
 
+[[package]]
+name = "rand_core"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a6fdeb83b075e8266dcc8762c22776f6877a63111121f5f8c7411e5be7eed4b"
+dependencies = [
+ "rand_core 0.4.2",
+]
+
+[[package]]
+name = "rand_core"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c33a3c44ca05fa6f1807d8e6743f3824e8509beca625669633be0acbdf509dc"
+
 [[package]]
 name = "rand_core"
 version = "0.6.4"
@@ -1461,6 +1495,15 @@ dependencies = [
  "getrandom",
 ]
 
+[[package]]
+name = "rdrand"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "678054eb77286b51581ba43620cc911abf02758c91f93f479767aed0f90458b2"
+dependencies = [
+ "rand_core 0.3.1",
+]
+
 [[package]]
 name = "redox_syscall"
 version = "0.2.16"
@@ -1542,6 +1585,15 @@ version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "436b050e76ed2903236f032a59761c1eb99e1b0aead2c257922771dab1fc8c78"
 
+[[package]]
+name = "remove_dir_all"
+version = "0.5.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3acd125665422973a33ac9d3dd2df85edad0f4ae9b00dafb1a05e43a9f5ef8e7"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "reqwest"
 version = "0.11.18"
@@ -1619,7 +1671,7 @@ dependencies = [
  "num_cpus",
  "parking_lot",
  "pin-project-lite",
- "rand",
+ "rand 0.8.5",
  "ref-cast",
  "rocket_codegen",
  "rocket_http",
@@ -1931,6 +1983,7 @@ dependencies = [
  "rocket",
  "rocket_dyn_templates",
  "rust-s3",
+ "tempdir",
 ]
 
 [[package]]
@@ -2060,6 +2113,16 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "tempdir"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
+dependencies = [
+ "rand 0.4.6",
+ "remove_dir_all",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.6.0"
@@ -2088,7 +2151,7 @@ dependencies = [
  "percent-encoding",
  "pest",
  "pest_derive",
- "rand",
+ "rand 0.8.5",
  "regex",
  "serde",
  "serde_json",

Cargo.toml

@@ -16,3 +16,4 @@ lazy_static = "1.4"
 rocket = { git = "https://github.com/SergioBenitez/Rocket", rev = "v0.5.0-rc.3" }
 rocket_dyn_templates = { git = "https://github.com/SergioBenitez/Rocket.git", rev = "v0.5.0-rc.3", features = ["tera"] }
 rust-s3 = { version = "0.32", default-features = false, features = ["tokio-rustls-tls"] }
+tempdir = "0.3"

src/main.rs

@@ -60,6 +60,10 @@ lazy_static! {
             .expect("Cannot find or authenticate to S3 bucket")
     };
     static ref FILEVIEW_TEMPLATE: &'static str = std::include_str!("../templates/index.html.tera");
+
+    // Workaround for https://github.com/SergioBenitez/Rocket/issues/1792
+    static ref EMPTY_DIR: tempdir::TempDir = tempdir::TempDir::new("serves3")
+        .expect("Unable to create an empty temporary folder, is the whole FS read-only?");
 }
 
 #[derive(Responder)]
@@ -182,7 +186,10 @@ async fn s3_fileview(path: &PathBuf) -> Result<Vec<String>, Error> {
 #[rocket::launch]
 fn rocket() -> _ {
     eprintln!("Proxying to {} for {}", BUCKET.host(), BUCKET.name());
-    rocket::build()
+
+    let config_figment = rocket::Config::figment().merge(("template_dir", EMPTY_DIR.path())); // We compile the templates in anyway.
+
+    rocket::custom(config_figment)
         .mount("/", rocket::routes![index])
         .attach(Template::custom(|engines| {
             engines