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R CMD check on macos-latest fails to extract mac.cran.dev's odbc binary #388
The macos-latest (release) job in R CMD check fails while it installs dependencies. pak downloads the odbc 1.7.1 binary from mac.cran.dev, and that file is Zstandard data with a .tgz name, so pak stops with "unknown archive type". CRAN has a valid gzip binary of the same build.
#389 works around this. It installs odbc from CRAN before pak runs, and pak keeps that copy.
Agent-written detail: verification
Posit Package Manager has no odbc binary for macOS arm64 and R 4.6. The file returns 404 and the PACKAGES index has no odbc entry, so pak resolves odbc from cran.rstudio.com, with mac.cran.dev as the second source.
cran.r-project.org and cran.rstudio.com serve a gzip file whose MD5 matches their PACKAGES index.
mac.cran.dev lists the same MD5 in its own PACKAGES index, but the file it serves has a different MD5.
changed the title [-]R CMD check on macos-latest fails on odbc's missing binary[/-][+]R CMD check on macos-latest fails to extract mac.cran.dev's odbc binary[/+]on Sep 23, 2026
The
macos-latest (release)job in R CMD check fails while it installs dependencies. pak downloads the odbc 1.7.1 binary frommac.cran.dev, and that file is Zstandard data with a.tgzname, so pak stops with "unknown archive type". CRAN has a valid gzip binary of the same build.#389 works around this. It installs odbc from CRAN before pak runs, and pak keeps that copy.
Agent-written detail: verification
PACKAGESindex has no odbc entry, so pak resolves odbc fromcran.rstudio.com, withmac.cran.devas the second source.cran.r-project.organdcran.rstudio.comserve a gzip file whose MD5 matches theirPACKAGESindex.mac.cran.devlists the same MD5 in its ownPACKAGESindex, but the file it serves has a different MD5.mainafter ci: bump the R CMD check dependency cache version #385, and on ci: install odbc from CRAN before pak on macOS #389 before its current approach), and a local run on R 4.6.1 arm64 with a fresh library reproduces it. In each pak log, the downloaded file is the 3.24 MBmac.cran.devfile, not the 3.81 MB CRAN file.