error: readme README.md does not appear to exist

[Henry-Hiles]

Describe the bug

Commit 4926f1a causes an error when building continuwuity, not sure why, maybe a bug. Works perfectly the commit before, we have pinned to that for now.

error: Cannot build '/nix/store/4n069prkvkb5v96a0azmpsfw62jg05p1-cargo-git-https-forgejo.ellis.link-continuwuation-ruwuma-bb12ed288a31a23aa11b10ba0fad22b7f985eb88.drv'.
       Reason: builder failed with exit code 1.
       Output paths:
         /nix/store/y2bg8wd519dlychg2a2nwrqs184d4g4f-cargo-git-https-forgejo.ellis.link-continuwuation-ruwuma-bb12ed288a31a23aa11b10ba0fad22b7f985eb88
       Last 8 log lines:
       > Running phase: unpackPhase
       > unpacking source archive /nix/store/5n1ihyy771zdwpkyg7hx7kwrfhbhdgc4-source
       > source root is source
       > Running phase: patchPhase
       > Running phase: updateAutotoolsGnuConfigScriptsPhase
       > Running phase: installPhase
       > error: readme `README.md` does not appear to exist (relative to `/build/source/crates/draupnir-antispam`).
       > Please update the readme setting in the manifest at `/build/source/crates/draupnir-antispam/Cargo.toml`.
       For full logs, run:
         nix log /nix/store/4n069prkvkb5v96a0azmpsfw62jg05p1-cargo-git-https-forgejo.ellis.link-continuwuation-ruwuma-bb12ed288a31a23aa11b10ba0fad22b7f985eb88.drv
error: Cannot build '/nix/store/m1hwab6p91y34d93rwpivfnxrrs9s0sc-linkLockedDeps.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/b8gcqly9zsyycpjm7zid5kw1b8qqj2wg-linkLockedDeps
note: keeping build directory '/nix/var/nix/builds/nix-643916-3163669521/build'
note: keeping build directory '/nix/var/nix/builds/nix-643916-3163669522/build'
error: Cannot build '/nix/store/1zcvksn97l2clf790i9q1g7k2ikv08fq-vendor-cargo-deps.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/0qxw3rdphywfgmq5f5f5z8pb41rv33l6-vendor-cargo-deps
error: Cannot build '/nix/store/xqmqxd9kg02ggls9m3b8d1wf9g6q70rj-conduwuit-0.5.6.drv'.
       Reason: 1 dependency failed.
       Output paths:
         /nix/store/f82zr4nwnn1r689983hmdmhmm3lsk99v-conduwuit-0.5.6

Reproduction

I don't know a minimal one, sorry, but you can clone continuwuity, unpin crane in flake.nix, and run nix build .#default.

[ipetkov]

Hi @Henry-Hiles thanks for the report!

It looks like continuwuity depends on https://forgejo.ellis.link/continuwuation/continuwuity, which includes two crates, draupnir-antispam and meowlnir-antispam, each of which define a path to a README.md file which is subsequently missing (from their crate subdirectory). I would consider this a cargo-configuration bug as trying to cargo publish a crate like this would cause errors.

There are several paths to remedy which I could suggest:

1. Update each of these two crates' Cargo.toml files to entirely omit the readme = "README.md" lines, then update the locked git revision in continuwuity
2. Update each of these two crates to contain a README.md file, then update the locked git revision in continuwuity
3. Add some vendoring patch logic to the continuwuity derivation to apply these fixes locally

Hope this helps!

[Henry-Hiles]

Thank you, I'll relay this back to them!