use container entrypoint if no command specified

[Panaetius]

PR Type

Enhancement

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Description

• Introduces Docker image metadata inspection

• Adds support for using container entrypoint when no command specified

• Enhances image compatibility checking

• Updates configuration defaults

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Diagram Walkthrough

flowchart LR
  A["handle_edf"] -- "image_meta" --> B["validate_arch"]
  A -- "image_meta" --> C["insert edf_image"]
  D["handle_script"] -- "image_meta" --> E["use entrypoint"]
  D -- "image_meta" --> F["command fallback"]
  G["cscs_job_start"] -- "image_meta" --> A
  G -- "image_meta" --> D

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File Walkthrough

	Relevant files
Enhancement	handlers.rs Docker image metadata integration                                                coman/src/cscs/handlers.rs Added image_meta parameter to handle_edf and handle_script functions Implemented logic to use container entrypoint when no command is specified Updated image validation to use metadata for architecture checking Added image metadata inspection in cscs_job_start +71/-41  types.rs OCI image metadata extraction                                                        coman/src/util/types.rs Replaced oci-distribution with oci-client and oci-spec dependencies Added DockerImageMeta fields for entrypoint and working directory Implemented From conversion for OciPlatform Enhanced inspect() method to extract image metadata including entrypoint +36/-14
Configuration changes	config.toml Extended default job timeout                                                          coman/.config/config.toml Increased default job time limit from 1 hour to 24 hours +1/-1
Dependencies	Cargo.toml Updated OCI dependencies                                                                  coman/Cargo.toml Replaced oci-distribution dependency with oci-client and oci-spec Added docker_credential dependency +2/-1

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[github-actions]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Image Metadata Handling The PR introduces logic to fetch and validate Docker image metadata, including platform compatibility and entrypoint information. Ensure that the error handling for image inspection is robust and that fallback mechanisms are properly tested. if let Some(meta) = image_meta { if let Some(system_info) = config.values.cscs.systems.get(current_system) { let mut compatible = false; for sys_platform in system_info.architecture.iter() { if meta.platforms.contains(&sys_platform.clone().into()) { compatible = true; } } if !compatible { return Err(eyre!( "System {} only supports images with architecture(s) '{}' but the supplied image is for architecture(s) '{}'", current_system, system_info.architecture.join(","), meta.platforms .iter() .map(|p| p.to_string()) .collect::<Vec<String>>() .join(",") )); } } } else { println!("warn: no docker image metadata found, skipping validation"); } Command Fallback Logic The command fallback logic now uses the container's entrypoint when no command is specified. Verify that this behavior aligns with expected usage patterns and that the entrypoint is correctly extracted and formatted from the image metadata. let command = match &options.command { Some(cmd) => cmd.clone(), None => { if !config.values.cscs.command.is_empty() { config.values.cscs.command.clone() } else { // use default entrypoint if let Some(meta) = image_meta { meta.clone().entrypoint.unwrap_or(vec![]) } else { vec![] } } } }; context.insert("command", &command.join(" ")); OCI Platform Conversion New conversion logic from oci_spec::image::Arch to OciPlatform has been added. Confirm that all possible architectures are handled correctly and that the conversion preserves the intended platform representation. impl From<Arch> for OciPlatform { fn from(value: Arch) -> Self { match value { Arch::ARM64 => Self::arm64, Arch::Amd64 => Self::amd64, _ => Self::Other, } } }

[github-actions]

PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Impact
Possible issue	Handle JSON parsing errors properly Using unwrap() can cause runtime panics if deserialization fails. It's better to propagate the error using ? operator to handle potential JSON parsing issues gracefully. coman/src/util/types.rs [98] -let config: ConfigFile = serde_json::from_str(&config).unwrap(); +let config: ConfigFile = serde_json::from_str(&config)?; Suggestion importance[1-10]: 7 __ Why: The suggestion correctly identifies a potential runtime panic from unwrap() during JSON deserialization. Using ? instead propagates the error gracefully, which is a good practice for robust error handling, though it's a moderate improvement in terms of impact.	Medium
	Handle missing entrypoint gracefully The code should handle the case when image_meta is None more explicitly by checking for entrypoint existence before unwrapping. This prevents potential panics if the entrypoint is missing. coman/src/cscs/handlers.rs [732-747] let command = match &options.command { Some(cmd) => cmd.clone(), None => { if !config.values.cscs.command.is_empty() { config.values.cscs.command.clone() } else { // use default entrypoint if let Some(meta) = image_meta { - meta.clone().entrypoint.unwrap_or(vec![]) + meta.clone().entrypoint.unwrap_or_default() } else { vec![] } } } }; Suggestion importance[1-10]: 4 __ Why: The suggestion proposes using unwrap_or_default() instead of unwrap_or(vec![]) to handle potential missing entrypoints. While this improves safety slightly, it doesn't address the core issue of potentially missing entrypoints and is a minor stylistic improvement.	Low
General	Simplify architecture compatibility check The architecture validation logic could be simplified by using any() instead of manually iterating and setting a boolean flag. This makes the code more readable and concise. coman/src/cscs/handlers.rs [649-673] if let Some(meta) = image_meta { if let Some(system_info) = config.values.cscs.systems.get(current_system) { - let mut compatible = false; - for sys_platform in system_info.architecture.iter() { - if meta.platforms.contains(&sys_platform.clone().into()) { - compatible = true; - } - } - - if !compatible { + if !meta.platforms.iter().any(|p| system_info.architecture.contains(&p.to_string())) { return Err(eyre!( "System {} only supports images with architecture(s) '{}' but the supplied image is for architecture(s) '{}'", current_system, system_info.architecture.join(","), meta.platforms .iter() .map(|p| p.to_string()) .collect::<Vec<String>>() .join(",") )); } } } else { println!("warn: no docker image metadata found, skipping validation"); } Suggestion importance[1-10]: 6 __ Why: The suggestion improves code readability by replacing manual iteration with any() to check architecture compatibility. This makes the logic clearer and more concise without changing functionality.	Low