Prefetch downloads same repo multiple times

[kristoff3r]

On the latest master, the following happens when running crate2nix generate for https://github.com/Hirevo/alexandrie:

Prefetching    1/1: https://github.com/rustasync/tide
Prefetching    2/1: https://github.com/rustasync/tide
Prefetching    3/1: https://github.com/rustasync/tide
Prefetching    4/1: https://github.com/rustasync/tide
Prefetching    5/1: https://github.com/rustasync/tide
Prefetching    6/1: https://github.com/rustasync/tide
Prefetching    7/1: https://github.com/rustasync/tide
Prefetching    8/1: https://github.com/rustasync/tide
Wrote hashes to ./crate-hashes.json.
Generated ./Cargo.nix successfully.

And it generates the following crate hashes:

{
  "tide 0.2.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-cookies 0.2.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-core 0.2.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-cors 0.2.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-forms 0.1.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-headers 0.1.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-log 0.1.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98",
  "tide-querystring 0.1.0 (git+https://github.com/rustasync/tide?rev=af0b900#af0b900bc447eb4410874752c9a7a35b9be79561)": "1izyw0132p1yzpd3frlqjmn4fy3z4l39x9k6rak5lgf9rj4gix98"
}

The problem is that multiple git packages with the same source doesn't get the same packageid, even though we only want to prefetch once, and you currently use that id to look up the hash.

[kolloch]

I tested it on Hirevo/alexandrie@d27954b and it works now.

[kolloch]

Thank you for your report :)