Add AppStream metadata support (roadmap Phase 1) - #7
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Adds an optional `app` object to the manifest (summary, description, homepage, license, categories, icon, screenshots, desktop_file, release_date), validates icon/desktop_file paths and desktop-entry syntax at pack time, and adds `npack appstream` to render a console-application or desktop-application AppStream <component> document from a built .npk. CI installs appstreamcli and validates a generated sample document. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Summary
appobject to the manifest for AppStream-compatible metadata:summary,description,homepage,license,categories,icon,screenshots,desktop_file,release_date.npack packvalidatesicon/desktop_fileare safe package-relative paths that exist in the source tree, and validatesdesktop_fileas a syntactically correct freedesktop.org Desktop Entry file (Type,Name, andExecwhenType=Application).npack appstream <artifact> [--output <metainfo.xml>], rendering aconsole-application(with<provides><binary>) ordesktop-application(with<launchable type="desktop-id">) AppStream<component>document from a built.npk's manifest.appstreamcliand validates a generated sample document withappstreamcli validate --no-net, confirmed locally to pass (only informational hints remain, no errors/warnings).This closes out roadmap Phase 1: "an npack package can describe itself in the language already understood by Linux application stores."
Test plan
cargo fmt --all -- --checkcargo clippy --all-targets --all-features(no warnings)cargo test(45 passing, including new desktop-file/AppStream tests)pack→appstream→appstreamcli validate --no-netagainst a real desktop-application and a console-application sample, both passing🤖 Generated with Claude Code