Unexpected platform mismatch on Linux

[jeroen]

I am getting a platform mismatch error on Linux for a package that has Platform: x86_64-pc-linux-gnu.

Reproduce

Run for example in this container:

docker run --rm -it ghcr.io/r-wasm/webr:main bash

And then run:

options(repos = c(getOption('repos'), 'https://paws-r.r-universe.dev/bin/linux/noble/4.4/'))
pak::pak("paws")

> pak::pak("paws")
v Updated metadata database: 3.92 MB in 9 files.
v Updating metadata database ... done
Error:
! error in pak subprocess
Caused by error:
! Could not solve package dependencies:
* paws: dependency conflict
* paws: Can't install dependency paws.storage (>= 0.8.0)
* paws.storage: Platform mismatch
Type .Last.error to see the more details.

[gaborcsardi]

Seems like a bug in pkgcache. A workaround is to remove the extra newline from the end of https://paws-r.r-universe.dev/bin/linux/noble/4.4/src/contrib/PACKAGES (+ PACKAGES.gz, etc.)

[jeroen]

OK thank you. FFR I have implemented another temporary workaround which adds an unimportant field at the end of each dcf entry, such that the Platform field does not appear at the end.

This indeed fixes the issue, so fortunately the Platform field itself is OK and it is only a bug in the dcf parser.

Should I open an issue in pkgcache or can you transfer the current issue?

[gaborcsardi]

Reprex:

writeLines(c("Package: foo", ""), tmp <- tempfile())
pkgcache::parse_packages(tmp)

# A data frame: 1 × 1
  Package
  <chr>
1 "foo\n"

[gaborcsardi]

Smaller reprex:

❯ .Call(pkgcache:::pkgcache_parse_packages_raw, charToRaw("Package: foo\n\n"))
$Package
[1] "foo\n"

[jeroen]

Thank you