fix(run): explicit config path needed when executing as root with rootless configure

Author: EmixamPP

CHANGELOG.md

@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - New TUI interface for improved user experience and understanding.
 - `tweak` command is now accessible via the `configure` command.
 - Better balance between configuration search time and exhaustiveness.
+- Full rootless capabilities.
 
 ### Added
 - More debug commands to help users to report issues: `--config`, `--log`, `--grey-devices`.

CONTRIBUTING.md

@@ -3,7 +3,7 @@ Thank you for considering contributing to our project! We appreciate your intere
 
 ## Packaging Guidelines
 When building a package for distribution, please ensure the following:
-1. You modified the configuration and log file paths in [.cargo/config.toml](.cargo/config.toml) to match the packaging standards of the target distribution.
+1. You can modify the configuration and log file paths in [.cargo/config.toml](.cargo/config.toml) to match the packaging standards of the target distribution. Note that the defaults allow rootless utilization.
 2. The only external *compile time* dependency needed are
    * `gcc`
    * `libclang`

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "linux-enable-ir-emitter"
-version = "7.0.0-beta1"
+version = "7.0.0-beta2"
 edition = "2024"
 authors = ["Maxime Dirksen (EmixamPP)"]
 license = "MIT"

Cargo.toml

@@ -11,14 +11,14 @@ Provides support for infrared cameras that are not directly enabled out-of-the b
 > If you plan to package this software for a Linux distribution, or to contribute code, please read [CONTRIBUTING.md](CONTRIBUTING.md).
 
 ## Installation
-Download the latest [linux-enable-ir-emitter-x.x.x-release-x86-64.tar.gz](https://github.com/EmixamPP/linux-enable-ir-emitter/releases). Then execute:
+Download the latest asset [linux-enable-ir-emitter-x.x.x-release-x86-64.tar.gz](https://github.com/EmixamPP/linux-enable-ir-emitter/releases). Then execute:
 > [!NOTE]
 > Please try the 7.0.0-beta! Furthermore, this README has been updated for this version.
 
 ```
 tar -C $HOME/.local/bin --no-same-owner -m -vxzf linux-enable-ir-emitter*.tar.gz
 ```
-If not already done, add `$HOME/.local/bin` to your PATH, e.g.:
+If not already done, add `$HOME/.local/bin` to your `$PATH`, e.g.:
 ```
 echo 'export PATH=$HOME/.local/bin:$PATH' >> $HOME/.bashrc && source $HOME/.bashrc
 ```
@@ -31,16 +31,20 @@ The installation consists of 3 files:
 ### Integration with Howdy
 In all files returned by `grep -rl howdy /etc/pam.d`, add the following line before the one mentioning "howdy", replacing `<USER>` with your actual username:
 ```
-auth optional pam_exec.so /home/<USER>/.local/bin/linux-enable-ir-emitter run
+auth optional pam_exec.so /home/<USER>/.local/bin/linux-enable-ir-emitter run --config /home/<USER>/.config/linux-enable-ir-emitter.toml
 ```
 
-The path to the binary may vary depending on your installation method. You can determine the correct absolute path by running `which linux-enable-ir-emitter` and use that path instead.
+> [!TIP]
+> The installation paths may vary depending on your installation method. You can determine the correct binary absolute paths by running `which linux-enable-ir-emitter` and use that path instead. For the configuration path, it will be written when you can execute `linux-enable-ir-emitter --config`.
 
 ### Integration with other program
 You will need to execute the `linux-enable-ir-emitter run` command before the program that uses the infrared camera.
 
 Alternatively, if you can and/or want to integrate better with the program that uses the camera, you can pass an opened file descriptor for the camera to the command: `linux-enable-ir-emitter run --device <DEVICE> --fd <FD>`.
 
+> [!Important]
+> You will need to pass the config path as argument to `linux-enable-ir-emitter run --config <CONFIG_PATH>` **when executed as root** if `linux-enable-ir-emitter configure` was executed as a normal user.
+
 ## How do I enable my infrared emitter?
 0. For a better experience, use a large terminal window.
 1. Execute the command: `linux-enable-ir-emitter configure`

README.md

@@ -1,7 +1,7 @@
 use crate::video::uvc::XuControl;
 
 use std::collections::{BTreeMap as Map, BTreeSet as Set};
-use std::path::Path;
+use std::path::{Path, PathBuf};
 
 use anyhow::{Context, Result, anyhow};
 use derive_more::AsRef;
@@ -13,23 +13,23 @@ static _CONFIG: &str = env!("CONFIG");
 #[cfg(test)]
 pub const _CONFIG: &str = "target/tmp/linux-enable-ir-emitter.toml";
 
-fn config_file_path() -> Result<String> {
+fn config_file_path() -> Result<PathBuf> {
     Ok(shellexpand::env(_CONFIG)
         .context("failed to expend shell variable in log file path")?
-        .to_string())
+        .to_string()
+        .into())
 }
 
 pub fn print_config() -> Result<()> {
     let config_file = config_file_path()?;
     let content_str =
         std::fs::read_to_string(&config_file).context("failed to read configuration file")?;
-    print!("# {}\n\n{}", config_file, content_str);
+    print!("# {}\n\n{}", config_file.display(), content_str);
     Ok(())
 }
 
 mod path {
     use super::*;
-    use std::path::PathBuf;
 
     #[derive(Default, Debug, PartialEq, Eq, PartialOrd, Ord, Clone, AsRef)]
     pub struct V4LPath(PathBuf);
@@ -118,18 +118,25 @@ impl Configurations {
         let config_str =
             toml::to_string(&self.devices).context("failed to serialize configuration")?;
         let config_file = config_file_path()?;
-        log::debug!("Saving configuration at {}:\n{}", config_file, config_str);
+        log::debug!(
+            "Saving configuration at {}:\n{}",
+            config_file.display(),
+            config_str
+        );
         std::fs::write(config_file, config_str).context("failed to write configuration file")
     }
 
-    /// Load an existing configurations or create an empty one.
+    /// Load an existing configurations at the default location or create an empty one.
     pub fn load() -> Result<Self> {
-        Ok(match std::fs::read_to_string(config_file_path()?) {
-            Ok(config_str) => Self {
-                devices: toml::from_str(&config_str)
-                    .context("failed to parse configuration file")?,
-            },
-            Err(_) => Self::default(),
+        Ok(Self::load_from(&config_file_path()?).unwrap_or_default())
+    }
+
+    /// Load an existing configurations at a specified path.
+    pub fn load_from(config: &Path) -> Result<Self> {
+        log::info!("Loading configuration from {}.", config.display());
+        let config_str = std::fs::read_to_string(config)?;
+        Ok(Self {
+            devices: toml::from_str(&config_str).context("failed to parse configuration file")?,
         })
     }
 
@@ -140,9 +147,8 @@ impl Configurations {
     /// Initializes an existing configuration if it does not exist.
     fn initialize_config_dir() -> Result<()> {
         let config_file = config_file_path()?;
-        log::debug!("Configuration located at: {}", config_file);
-        let config_dir = Path::new(&config_file).parent();
-        if let Some(config_dir) = config_dir {
+        log::debug!("Configuration located at: {}", config_file.display());
+        if let Some(config_dir) = config_file.parent() {
             std::fs::create_dir_all(config_dir).context("failed to create configuration directory")
         } else {
             Ok(())

src/configuration.rs

@@ -29,9 +29,9 @@ async fn main() -> Result<()> {
             log::debug!("Version {}.", env!("CARGO_PKG_VERSION"));
             configure::configure().await
         }
-        Some(Commands::Run { device, fd }) => {
+        Some(Commands::Run { device, fd, config }) => {
             logger::init_term()?;
-            run::run(device.as_deref(), fd)
+            run::run(device.as_deref(), fd, config.as_deref())
         }
         None => Ok(()),
     }
@@ -76,5 +76,12 @@ enum Commands {
             requires = "device"
         )]
         fd: Option<i32>,
+        #[arg(
+            short,
+            long,
+            help = "Specify the configuration file to use. Default: use the default configuration path.",
+            default_value = None,
+        )]
+        config: Option<std::path::PathBuf>,
     },
 }

src/main.rs

@@ -10,12 +10,17 @@ use std::path::Path;
 ///
 /// Does not return an error if no configuration exists for the device.
 ///
-pub fn run(device: Option<&Path>, fd: Option<i32>) -> Result<()> {
+pub fn run(device: Option<&Path>, fd: Option<i32>, config: Option<&Path>) -> Result<()> {
     if fd.is_some() && device.is_none() {
         bail!("if a file descriptor is provided, a device path must also be provided");
     }
 
-    let config = Configurations::load()?;
+    let config = if let Some(config) = config {
+        Configurations::load_from(config)?
+    } else {
+        Configurations::load()?
+    };
+
     for (path, conf) in config.devices() {
         if let Some(d) = device
             && d != path.as_ref()