Fallback from RSPM download failures

[gaborcsardi]

RSPM Linux binaries are treated as source package currently, that might actually help.

macOS and Windows are trickier, because there you cannot currently fall back from a binary package to a source package.

[krlmlr]

Is there an option to install only binary packages, even if sources are newer? I remember a similar issue but can't find it.

Installing igraph (and many other packages) from source is a frustrating and futile exercise if a slightly older binary is readily available... https://github.com/cynkra/dm/runs/4536359277?check_suite_focus=true

[krlmlr]

(I might be using v1 there still.)

[gaborcsardi]

v2 automatically installs binaries, if they are available, unless source packages are explicitly required by some dependency.

[gaborcsardi]

RSPM is much more stable now, so I am going to close this. FWIW pkgcache/async supports backoff now (https://github.com/gaborcsardi/async/commit/ba9b3821a48c49b178d874ad6bb82e8b9af61067), but it is not yet used when downloading the package files.

Should package downloads be unreliable again, we can revisit this.

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