Merge #861: Rename environments variables

a4d2adf feat!: remove deprecated env var (Jose Celano)
ef15e0b refactor: [#851] rename env vars (Jose Celano)

Pull request description:

  ```text
  TORRUST_TRACKER_BACK_           -> TORRUST_TRACKER_

  TORRUST_TRACKER_DATABASE_DRIVER -> TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER
  TORRUST_TRACKER_API_ADMIN_TOKEN -> TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN

  TORRUST_TRACKER_CONFIG          -> TORRUST_TRACKER_CONFIG_TOML
  TORRUST_TRACKER_PATH_CONFIG     -> TORRUST_TRACKER_CONFIG_TOML_PATH
  ```

  DB_DRIVER values: `MySQL`, `Sqlite3`. Removed lowercase values `mysql` and `sqlite3` used in containers. Some enums use lowercase. This is a breaking change for containers but not for configuration. In the future, we could use lowercase also in the configuration.

ACKs for top commit:
  josecelano:
    ACK a4d2adf

Tree-SHA512: 9cbe5a94667c6a3df63949dc9a26e0323d909aef2e450e4de71b93be3d93d9ae9192d60f1a7b36f9fc0a886021a45ee28db005b83ab50d12f8a992d6dda254ff

Containerfile

@@ -95,16 +95,16 @@ FROM gcr.io/distroless/cc-debian12:debug as runtime
 RUN ["/busybox/cp", "-sp", "/busybox/sh","/busybox/cat","/busybox/ls","/busybox/env", "/bin/"]
 COPY --from=gcc --chmod=0555 /usr/local/bin/su-exec /bin/su-exec
 
-ARG TORRUST_TRACKER_PATH_CONFIG="/etc/torrust/tracker/tracker.toml"
-ARG TORRUST_TRACKER_DATABASE_DRIVER="sqlite3"
+ARG TORRUST_TRACKER_CONFIG_TOML_PATH="/etc/torrust/tracker/tracker.toml"
+ARG TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER="Sqlite3"
 ARG USER_ID=1000
 ARG UDP_PORT=6969
 ARG HTTP_PORT=7070
 ARG API_PORT=1212
 ARG HEALTH_CHECK_API_PORT=1313
 
-ENV TORRUST_TRACKER_PATH_CONFIG=${TORRUST_TRACKER_PATH_CONFIG}
-ENV TORRUST_TRACKER_DATABASE_DRIVER=${TORRUST_TRACKER_DATABASE_DRIVER}
+ENV TORRUST_TRACKER_CONFIG_TOML_PATH=${TORRUST_TRACKER_CONFIG_TOML_PATH}
+ENV TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER=${TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER}
 ENV USER_ID=${USER_ID}
 ENV UDP_PORT=${UDP_PORT}
 ENV HTTP_PORT=${HTTP_PORT}

README.md

@@ -84,14 +84,14 @@ cp ./share/default/config/tracker.development.sqlite3.toml ./storage/tracker/etc
 vim ./storage/tracker/etc/tracker.toml
 
 # Run the tracker with the updated configuration:
-TORRUST_TRACKER_PATH_CONFIG="./storage/tracker/etc/tracker.toml" cargo run
+TORRUST_TRACKER_CONFIG_TOML_PATH="./storage/tracker/etc/tracker.toml" cargo run
 ```
 
 _Optionally, you may choose to supply the entire configuration as an environmental variable:_
 
 ```sh
 # Use a configuration supplied on an environmental variable:
-TORRUST_TRACKER_CONFIG=$(cat "./storage/tracker/etc/tracker.toml") cargo run
+TORRUST_TRACKER_CONFIG_TOML=$(cat "./storage/tracker/etc/tracker.toml") cargo run
 ```
 
 _For deployment, you **should** override the `api_admin_token` by using an environmental variable:_
@@ -102,8 +102,8 @@ gpg --armor --gen-random 1 10 | tee ./storage/tracker/lib/tracker_api_admin_toke
 chmod go-rwx ./storage/tracker/lib/tracker_api_admin_token.secret
 
 # Override secret in configuration using an environmental variable:
-TORRUST_TRACKER_CONFIG=$(cat "./storage/tracker/etc/tracker.toml") \
-  TORRUST_TRACKER_API_ADMIN_TOKEN=$(cat "./storage/tracker/lib/tracker_api_admin_token.secret") \
+TORRUST_TRACKER_CONFIG_TOML=$(cat "./storage/tracker/etc/tracker.toml") \
+  TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN=$(cat "./storage/tracker/lib/tracker_api_admin_token.secret") \
   cargo run
 ```
 

compose.yaml

@@ -4,8 +4,8 @@ services:
     image: torrust-tracker:release
     tty: true
     environment:
-      - TORRUST_TRACKER_DATABASE_DRIVER=${TORRUST_TRACKER_DATABASE_DRIVER:-mysql}
-      - TORRUST_TRACKER_API_ADMIN_TOKEN=${TORRUST_TRACKER_API_ADMIN_TOKEN:-MyAccessToken}
+      - TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER=${TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER:-MySQL}
+      - TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN=${TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN:-MyAccessToken}
     networks:
       - server_side
     ports:

docs/benchmarking.md

@@ -39,7 +39,7 @@ Build and run the tracker:
 
 ```console
 cargo build --release
-TORRUST_TRACKER_PATH_CONFIG="./share/default/config/tracker.udp.benchmarking.toml" ./target/release/torrust-tracker
+TORRUST_TRACKER_CONFIG_TOML_PATH="./share/default/config/tracker.udp.benchmarking.toml" ./target/release/torrust-tracker
 ```
 
 Run the load test with:

docs/containers.md

@@ -147,10 +147,10 @@ Environmental variables are loaded through the `--env`, in the format `--env VAR
 
 The following environmental variables can be set:
 
-- `TORRUST_TRACKER_PATH_CONFIG` - The in-container path to the tracker configuration file, (default: `"/etc/torrust/tracker/tracker.toml"`).
-- `TORRUST_TRACKER_API_ADMIN_TOKEN` - Override of the admin token. If set, this value overrides any value set in the config.
-- `TORRUST_TRACKER_DATABASE_DRIVER` - The database type used for the container, (options: `sqlite3`, `mysql`, default `sqlite3`). Please Note: This dose not override the database configuration within the `.toml` config file.
-- `TORRUST_TRACKER_CONFIG` - Load config from this environmental variable instead from a file, (i.e: `TORRUST_TRACKER_CONFIG=$(cat tracker-tracker.toml)`).
+- `TORRUST_TRACKER_CONFIG_TOML_PATH` - The in-container path to the tracker configuration file, (default: `"/etc/torrust/tracker/tracker.toml"`).
+- `TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN` - Override of the admin token. If set, this value overrides any value set in the config.
+- `TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER` - The database type used for the container, (options: `Sqlite3`, `MySQL`, default `Sqlite3`). Please Note: This dose not override the database configuration within the `.toml` config file.
+- `TORRUST_TRACKER_CONFIG_TOML` - Load config from this environmental variable instead from a file, (i.e: `TORRUST_TRACKER_CONFIG_TOML=$(cat tracker-tracker.toml)`).
 - `USER_ID` - The user id for the runtime crated `torrust` user. Please Note: This user id should match the ownership of the host-mapped volumes, (default `1000`).
 - `UDP_PORT` - The port for the UDP tracker. This should match the port used in the configuration, (default `6969`).
 - `HTTP_PORT` - The port for the HTTP tracker. This should match the port used in the configuration, (default `7070`).
@@ -205,7 +205,7 @@ mkdir -p ./storage/tracker/lib/ ./storage/tracker/log/ ./storage/tracker/etc/
 
 ## Run Torrust Tracker Container Image
 docker run -it \
-    --env TORRUST_TRACKER_API_ADMIN_TOKEN="MySecretToken" \
+    --env TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN="MySecretToken" \
     --env USER_ID="$(id -u)" \
     --publish 0.0.0.0:7070:7070/tcp \
     --publish 0.0.0.0:6969:6969/udp \
@@ -227,7 +227,7 @@ mkdir -p ./storage/tracker/lib/ ./storage/tracker/log/ ./storage/tracker/etc/
 
 ## Run Torrust Tracker Container Image
 podman run -it \
-    --env TORRUST_TRACKER_API_ADMIN_TOKEN="MySecretToken" \
+    --env TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN="MySecretToken" \
     --env USER_ID="$(id -u)" \
     --publish 0.0.0.0:7070:7070/tcp \
     --publish 0.0.0.0:6969:6969/udp \
@@ -255,7 +255,7 @@ docker build --target release --tag torrust-tracker:release --file Containerfile
 mkdir -p ./storage/tracker/lib/ ./storage/tracker/log/ ./storage/tracker/etc/
 
 USER_ID=$(id -u) \
-    TORRUST_TRACKER_API_ADMIN_TOKEN="MySecretToken" \
+    TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN="MySecretToken" \
     docker compose up --build
 ```
 

docs/profiling.md

@@ -35,7 +35,7 @@ To generate the graph you will need to:
 ```console
 cargo build --profile=release-debug --bin=profiling
 ./target/release/aquatic_udp_load_test -c "load-test-config.toml"
-sudo TORRUST_TRACKER_PATH_CONFIG="./share/default/config/tracker.udp.benchmarking.toml" /home/USER/.cargo/bin/flamegraph -- ./target/release-debug/profiling 60
+sudo TORRUST_TRACKER_CONFIG_TOML_PATH="./share/default/config/tracker.udp.benchmarking.toml" /home/USER/.cargo/bin/flamegraph -- ./target/release-debug/profiling 60
 ```
 
 __NOTICE__: You need to install the `aquatic_udp_load_test` program.
@@ -92,7 +92,7 @@ Build and the binary for profiling:
 
 ```console
 RUSTFLAGS='-g' cargo build --release --bin profiling \
-   && export TORRUST_TRACKER_PATH_CONFIG="./share/default/config/tracker.udp.benchmarking.toml" \
+   && export TORRUST_TRACKER_CONFIG_TOML_PATH="./share/default/config/tracker.udp.benchmarking.toml" \
    && valgrind \
      --tool=callgrind \
      --callgrind-out-file=callgrind.out \

packages/configuration/src/lib.rs

@@ -24,14 +24,10 @@ pub const TORRENT_PEERS_LIMIT: usize = 74;
 
 /// The whole `tracker.toml` file content. It has priority over the config file.
 /// Even if the file is not on the default path.
-const ENV_VAR_CONFIG: &str = "TORRUST_TRACKER_CONFIG";
+const ENV_VAR_CONFIG_TOML: &str = "TORRUST_TRACKER_CONFIG_TOML";
 
 /// The `tracker.toml` file location.
-pub const ENV_VAR_PATH_CONFIG: &str = "TORRUST_TRACKER_PATH_CONFIG";
-
-/// Env var to overwrite API admin token.
-/// Deprecated: use `TORRUST_TRACKER_CONFIG_OVERRIDE_HTTP_API__ACCESS_TOKENS__ADMIN`.
-const ENV_VAR_API_ADMIN_TOKEN: &str = "TORRUST_TRACKER_API_ADMIN_TOKEN";
+pub const ENV_VAR_CONFIG_TOML_PATH: &str = "TORRUST_TRACKER_CONFIG_TOML_PATH";
 
 pub type Configuration = v1::Configuration;
 pub type UdpTracker = v1::udp_tracker::UdpTracker;
@@ -53,7 +49,6 @@ pub struct TrackerPolicy {
 pub struct Info {
     config_toml: Option<String>,
     config_toml_path: String,
-    api_admin_token: Option<String>,
 }
 
 impl Info {
@@ -65,9 +60,8 @@ impl Info {
     ///
     #[allow(clippy::needless_pass_by_value)]
     pub fn new(default_config_toml_path: String) -> Result<Self, Error> {
-        let env_var_config_toml = ENV_VAR_CONFIG.to_string();
-        let env_var_config_toml_path = ENV_VAR_PATH_CONFIG.to_string();
-        let env_var_api_admin_token = ENV_VAR_API_ADMIN_TOKEN.to_string();
+        let env_var_config_toml = ENV_VAR_CONFIG_TOML.to_string();
+        let env_var_config_toml_path = ENV_VAR_CONFIG_TOML_PATH.to_string();
 
         let config_toml = if let Ok(config_toml) = env::var(env_var_config_toml) {
             println!("Loading configuration from environment variable {config_toml} ...");
@@ -87,7 +81,6 @@ impl Info {
         Ok(Self {
             config_toml,
             config_toml_path,
-            api_admin_token: env::var(env_var_api_admin_token).ok(),
         })
     }
 }
@@ -146,7 +139,7 @@ impl AnnouncePolicy {
 pub enum Error {
     /// Unable to load the configuration from the environment variable.
     /// This error only occurs if there is no configuration file and the
-    /// `TORRUST_TRACKER_CONFIG` environment variable is not set.
+    /// `TORRUST_TRACKER_CONFIG_TOML` environment variable is not set.
     #[error("Unable to load from Environmental Variable: {source}")]
     UnableToLoadFromEnvironmentVariable {
         source: LocatedError<'static, dyn std::error::Error + Send + Sync>,

packages/configuration/src/v1/mod.rs

@@ -9,7 +9,7 @@
 //! with the same content as the file.
 //!
 //! Configuration can not only be loaded from a file, but also from an
-//! environment variable `TORRUST_TRACKER_CONFIG`. This is useful when running
+//! environment variable `TORRUST_TRACKER_CONFIG_TOML`. This is useful when running
 //! the tracker in a Docker container or environments where you do not have a
 //! persistent storage or you cannot inject a configuration file. Refer to
 //! [`Torrust Tracker documentation`](https://docs.rs/torrust-tracker) for more
@@ -288,10 +288,6 @@ impl Default for Configuration {
 }
 
 impl Configuration {
-    fn override_api_admin_token(&mut self, api_admin_token: &str) {
-        self.http_api.override_admin_token(api_admin_token);
-    }
-
     /// Returns the tracker public IP address id defined in the configuration,
     /// and `None` otherwise.
     #[must_use]
@@ -331,11 +327,7 @@ impl Configuration {
                 .merge(Env::prefixed(CONFIG_OVERRIDE_PREFIX).split(CONFIG_OVERRIDE_SEPARATOR))
         };
 
-        let mut config: Configuration = figment.extract()?;
-
-        if let Some(ref token) = info.api_admin_token {
-            config.override_api_admin_token(token);
-        };
+        let config: Configuration = figment.extract()?;
 
         Ok(config)
     }
@@ -469,7 +461,6 @@ mod tests {
             let info = Info {
                 config_toml: Some(empty_configuration),
                 config_toml_path: "tracker.toml".to_string(),
-                api_admin_token: None,
             };
 
             let configuration = Configuration::load(&info).expect("Could not load configuration from file");
@@ -491,7 +482,6 @@ mod tests {
             let info = Info {
                 config_toml: Some(config_toml),
                 config_toml_path: String::new(),
-                api_admin_token: None,
             };
 
             let configuration = Configuration::load(&info).expect("Could not load configuration from file");
@@ -515,7 +505,6 @@ mod tests {
             let info = Info {
                 config_toml: None,
                 config_toml_path: "tracker.toml".to_string(),
-                api_admin_token: None,
             };
 
             let configuration = Configuration::load(&info).expect("Could not load configuration from file");
@@ -534,27 +523,6 @@ mod tests {
             let info = Info {
                 config_toml: Some(default_config_toml()),
                 config_toml_path: String::new(),
-                api_admin_token: None,
-            };
-
-            let configuration = Configuration::load(&info).expect("Could not load configuration from file");
-
-            assert_eq!(
-                configuration.http_api.access_tokens.get("admin"),
-                Some("NewToken".to_owned()).as_ref()
-            );
-
-            Ok(())
-        });
-    }
-
-    #[test]
-    fn configuration_should_allow_to_overwrite_the_default_tracker_api_token_for_admin_with_the_deprecated_env_var_name() {
-        figment::Jail::expect_with(|_jail| {
-            let info = Info {
-                config_toml: Some(default_config_toml()),
-                config_toml_path: String::new(),
-                api_admin_token: Some("NewToken".to_owned()),
             };
 
             let configuration = Configuration::load(&info).expect("Could not load configuration from file");

packages/primitives/src/lib.rs

@@ -52,7 +52,9 @@ pub struct NumberOfBytes(pub i64);
 /// For more information about persistence.
 #[derive(Serialize, Deserialize, PartialEq, Eq, Debug, derive_more::Display, Clone)]
 pub enum DatabaseDriver {
-    // TODO: Move to the database crate once that gets its own crate.
+    // TODO:
+    //   - Move to the database crate once that gets its own crate.
+    //   - Rename serialized values to lowercase: `sqlite3` and `mysql`.
     /// The Sqlite3 database driver.
     Sqlite3,
     /// The `MySQL` database driver.

share/container/entry_script_sh

@@ -26,29 +26,29 @@ chmod -R 2770 /var/lib/torrust /var/log/torrust /etc/torrust
 
 
 # Install the database and config:
-if [ -n "$TORRUST_TRACKER_DATABASE_DRIVER" ]; then
-    if cmp_lc "$TORRUST_TRACKER_DATABASE_DRIVER" "sqlite3"; then
+if [ -n "$TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER" ]; then
+    if cmp_lc "$TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER" "Sqlite3"; then
 
-        # Select sqlite3 empty database
+        # Select Sqlite3 empty database
         default_database="/usr/share/torrust/default/database/tracker.sqlite3.db"
 
-        # Select sqlite3 default configuration
+        # Select Sqlite3 default configuration
         default_config="/usr/share/torrust/default/config/tracker.container.sqlite3.toml"
 
-    elif cmp_lc "$TORRUST_TRACKER_DATABASE_DRIVER" "mysql"; then
+    elif cmp_lc "$TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER" "MySQL"; then
 
-        # (no database file needed for mysql)
+        # (no database file needed for MySQL)
 
-        # Select default mysql configuration
+        # Select default MySQL configuration
         default_config="/usr/share/torrust/default/config/tracker.container.mysql.toml"
 
     else 
-        echo "Error: Unsupported Database Type: \"$TORRUST_TRACKER_DATABASE_DRIVER\"."
-        echo "Please Note: Supported Database Types: \"sqlite3\", \"mysql\"."
+        echo "Error: Unsupported Database Type: \"$TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER\"."
+        echo "Please Note: Supported Database Types: \"Sqlite3\", \"MySQL\"."
         exit 1
     fi
 else
-    echo "Error: \"\$TORRUST_TRACKER_DATABASE_DRIVER\" was not set!"; exit 1;
+    echo "Error: \"\$TORRUST_TRACKER_CONFIG_OVERRIDE_DB_DRIVER\" was not set!"; exit 1;
 fi
 
 install_config="/etc/torrust/tracker/tracker.toml"

src/bootstrap/config.rs

@@ -1,6 +1,6 @@
 //! Initialize configuration from file or env var.
 //!
-//! All environment variables are prefixed with `TORRUST_TRACKER_BACK_`.
+//! All environment variables are prefixed with `TORRUST_TRACKER_`.
 
 use torrust_tracker_configuration::{Configuration, Info};
 
@@ -11,7 +11,7 @@ pub const DEFAULT_PATH_CONFIG: &str = "./share/default/config/tracker.developmen
 /// There are two methods to inject the configuration:
 ///
 /// 1. By using a config file: `tracker.toml`.
-/// 2. Environment variable: `TORRUST_TRACKER_CONFIG`. The variable contains the same contents as the `tracker.toml` file.
+/// 2. Environment variable: `TORRUST_TRACKER_CONFIG_TOML`. The variable contains the same contents as the `tracker.toml` file.
 ///
 /// Environment variable has priority over the config file.
 ///
@@ -20,7 +20,7 @@ pub const DEFAULT_PATH_CONFIG: &str = "./share/default/config/tracker.developmen
 /// # Panics
 ///
 /// Will panic if it can't load the configuration from either
-/// `./tracker.toml` file or the env var `TORRUST_TRACKER_CONFIG`.
+/// `./tracker.toml` file or the env var `TORRUST_TRACKER_CONFIG_TOML`.
 #[must_use]
 pub fn initialize_configuration() -> Configuration {
     let info = Info::new(DEFAULT_PATH_CONFIG.to_string()).expect("info to load configuration is not valid");

src/console/ci/e2e/runner.rs

@@ -46,7 +46,7 @@ pub fn run() {
     // Besides, if we don't use port 0 we should get the port numbers from the tracker configuration.
     // We could not use docker, but the intention was to create E2E tests including containerization.
     let options = RunOptions {
-        env_vars: vec![("TORRUST_TRACKER_CONFIG".to_string(), tracker_config.to_string())],
+        env_vars: vec![("TORRUST_TRACKER_CONFIG_TOML".to_string(), tracker_config.to_string())],
         ports: vec![
             "6969:6969/udp".to_string(),
             "7070:7070/tcp".to_string(),

src/console/profiling.rs

@@ -27,7 +27,7 @@
 //!
 //! ```text
 //! RUSTFLAGS='-g' cargo build --release --bin profiling \
-//!   && export TORRUST_TRACKER_PATH_CONFIG="./share/default/config/tracker.udp.benchmarking.toml" \
+//!   && export TORRUST_TRACKER_CONFIG_TOML_PATH="./share/default/config/tracker.udp.benchmarking.toml" \
 //!   && valgrind \
 //!     --tool=callgrind \
 //!     --callgrind-out-file=callgrind.out \
@@ -40,7 +40,7 @@
 //!
 //! ```text
 //! RUSTFLAGS='-g' cargo build --release --bin profiling \
-//!    && export TORRUST_TRACKER_PATH_CONFIG="./share/default/config/tracker.udp.benchmarking.toml" \
+//!    && export TORRUST_TRACKER_CONFIG_TOML_PATH="./share/default/config/tracker.udp.benchmarking.toml" \
 //!    && valgrind \
 //!      --tool=callgrind \
 //!      --callgrind-out-file=callgrind.out \

src/lib.rs

@@ -213,10 +213,10 @@
 //! documentation for the [torrust-tracker-configuration crate](https://docs.rs/torrust-tracker-configuration).
 //!
 //! Alternatively to the `tracker.toml` file you can use one environment
-//! variable `TORRUST_TRACKER_CONFIG` to pass the configuration to the tracker:
+//! variable `TORRUST_TRACKER_CONFIG_TOML` to pass the configuration to the tracker:
 //!
 //! ```text
-//! TORRUST_TRACKER_CONFIG=$(cat ./share/default/config/tracker.development.sqlite3.toml) ./target/release/torrust-tracker
+//! TORRUST_TRACKER_CONFIG_TOML=$(cat ./share/default/config/tracker.development.sqlite3.toml) ./target/release/torrust-tracker
 //! ```
 //!
 //! In the previous example you are just setting the env var with the contents
@@ -225,7 +225,7 @@
 //! The env var contains the same data as the `tracker.toml`. It's particularly
 //! useful in you are [running the tracker with docker](https://github.com/torrust/torrust-tracker/tree/develop/docker).
 //!
-//! > NOTICE: The `TORRUST_TRACKER_CONFIG` env var has priority over the `tracker.toml` file.
+//! > NOTICE: The `TORRUST_TRACKER_CONFIG_TOML` env var has priority over the `tracker.toml` file.
 //!
 //! By default, if you don’t specify any `tracker.toml` file, the application
 //! will use `./share/default/config/tracker.development.sqlite3.toml`.