Repro builds: Deterministically iterate through docker/ folder

[kpcyrd]

One of the Arch Linux rebuilders has trouble reproducing the cross binary we distribute in Arch Linux. We assume this is because it runs a different filesystem than the official build server, causing fs::read_dir to yield the directory content in a different order.

This patch explicitly sorts the directory content of docker/ in build.rs before constructing a list that gets embedded in the binary.

Full writeup can be found over here: https://twitter.com/sn0int/status/1418254640324521997

[adamgreig]

bors try

[bors]

try

Build succeeded:

• shellcheck
• rust-embedded.cross

[adamgreig]

Thank you, and nice write-up too!

bors merge

[bors]

Build succeeded:

• rust-embedded.cross
• shellcheck

[kpcyrd]

Thanks! Are there any plans for a new release? I've noticed there hasn't been one since about a year. :)

[adamgreig]

Yea, we'd like a new release (#542) but currently have a couple last blockers (and should ideally get a few more pending PRs merged...). The main issue is we're desperately low on maintainer time, since most of the rust-embedded team nominally responsible don't use cross or know much about it. I've just posted #574 with details of that.