pkgdown workflow failing: pkgcache 2.2.5 res_one_row_df bug

[khusmann]

The Build irid Wasm binary step (r-wasm/actions/build-rwasm@v2) in .github/workflows/pkgdown.yaml has been failing since ~2026-05-08 with:

Error in "res_one_row_df(entries)" : ! `nrow(out)` must equal `1`.
Calls: <Anonymous> ... <Anonymous> -> pkgplan_resolve -> synchronise -> <Anonymous>

Root cause

Upstream bug in pkgcache 2.2.5 (current CRAN). Tracked in:

• Error in res_one_row_df(entries): ! nrow(out) must equal 1 r-lib/pak#804
• ! ! nrow(out) must equal 1 r-lib/pkgdepends#462
• rwasm::add_pkg() fails to resolve Bioconductor packages — nrow(out) must equal 1 r-wasm/rwasm#56

Fix is in dev pkgcache (merged to dev pak in r-lib/pak@ab497a7), not yet on CRAN.

Options

1. Wait for a pkgcache CRAN release that includes the fix — no action needed, will start passing automatically.

2. Workaround: replace the r-wasm/actions/build-rwasm@v2 step with an inline docker run that installs pak from the devel repo before calling rwasm::add_pkg:

   install.packages(
     "pak",
     repos = sprintf(
       "https://r-lib.github.io/p/pak/devel/%s/%s/%s",
       .Platform$pkgType, R.Version()$os, R.Version()$arch
     )
   )
   pak::pak("r-wasm/rwasm")
   rwasm::add_pkg("local::.", repo_dir = "_rwasm")
   rwasm::make_vfs_library(out_dir = ".", repo_dir = "_rwasm")

   Run inside ghcr.io/r-wasm/webr:main with the workspace mounted (the existing action's code.R is the template).

Close this once CRAN pkgcache > 2.2.5 ships and the workflow goes green again.