when building arch linux COSMIC packages, it followes what popos guys do for debian builds, first step cargo vendor and then cargo build --release --frozen --offline
for arch linux this has the effect if the build breaks, and builds everything again fresh. when not vendoring, it continues where it got broken. so i am wondering what is the advantage of vendoring, and what cannot be achieved if vendoring would not exist?
references:
Arch Linux pkgbuilds shouldn't use vendor. They should use fetch. See Rust package guidelines - ArchWiki
If the upstream build system is incompatible with that consider filing an issue with them asking for a way to fetch.
I think the main use case for the cargo vendor command is to create standalone/selfcontained release artifacts (a source code tarball, for examaple), which is suitable to be built even on environment that may be physically isolated from the internet.
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