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rustbuild can optionally build from vendored (in-tree) source of all cargo dependencies, where it does not touch the network, and that's how we expect packagers

by brson 10y ago

rustbuild can optionally build from vendored (in-tree) source of all cargo dependencies, where it does not touch the network, and that's how we expect packagers to build Rust. I believe Debian has their own bootstrap lineage where they bootstrap from Debian's own prior builds, and rustbuild supports this mode; but they also have a fallback for rebootstrapping, with the corresponding policy exceptions. If you are interested, here's a draft Debian Rust packaging policy: https://internals.rust-lang.org/t/debian-rust-packaging-policy-draft/4453 https://internals.rust-lang.org/t/debian-rust-packaging-poli.... It is not about packaging Rust itself though but the challenges of packaging software written in Rust.

tmzt 10y ago
Is any version of rust still buildable from the previous OCaml version? Could it still be bootstrapped from that point?
- steveklabnik 10y ago
  They have to be done in order. Only the first version that was in Rust could be compiled from the OCaml compiler. Then each one in series only builds with the specific parent compiler.
- geofft 10y ago
  I think it's bootstrappable, but I haven't tried: rustboot, the OCaml Rust implementation, was removed in 6997adf7 on 13 May 2011. It looks like it was fairly actively maintained until then. A file named src/snapshots.txt showed up in the repository in cb53065a on 2 May 2011, and remained there until 02538d46 on 13 April 2016. During that time, rustc was buildable from specific snapshots of previous versions of rustc, which were listed by both source commit and hashes of binary compilers. From 13 April 2016 onwards, stable rustc compiles on previous stable Rust, and specific versions are listed in src/stage0.txt in a similar fashion. So, you can probably take the last version of rustboot (it didn't change between 2 and 13 May 2011), compile that with some version of OCaml, then go from 2011 to 2016 by repeatedly building the newest snapshot possible with your current snapshot, then build stable Rust 1.10 onwards, thereby reducing it to the previously solved problem of verifying that Ken Thompson has not compromised your OCaml compiler.

by brson 10y ago

tmzt 10y ago

Is any version of rust still buildable from the previous OCaml version? Could it still be bootstrapped from that point?

steveklabnik 10y ago
They have to be done in order. Only the first version that was in Rust could be compiled from the OCaml compiler. Then each one in series only builds with the specific parent compiler.
geofft 10y ago
I think it's bootstrappable, but I haven't tried: rustboot, the OCaml Rust implementation, was removed in 6997adf7 on 13 May 2011. It looks like it was fairly actively maintained until then. A file named src/snapshots.txt showed up in the repository in cb53065a on 2 May 2011, and remained there until 02538d46 on 13 April 2016. During that time, rustc was buildable from specific snapshots of previous versions of rustc, which were listed by both source commit and hashes of binary compilers. From 13 April 2016 onwards, stable rustc compiles on previous stable Rust, and specific versions are listed in src/stage0.txt in a similar fashion. So, you can probably take the last version of rustboot (it didn't change between 2 and 13 May 2011), compile that with some version of OCaml, then go from 2011 to 2016 by repeatedly building the newest snapshot possible with your current snapshot, then build stable Rust 1.10 onwards, thereby reducing it to the previously solved problem of verifying that Ken Thompson has not compromised your OCaml compiler.