Re: [PR PATCH] [Updated] xbps-src: fetch from CRAN archive

[CameronNemo <CameronNemo@users.noreply.github.com>]

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There is an updated pull request by CameronNemo against master on the void-packages repository

https://github.com/CameronNemo/void-packages R-cran-archive
https://github.com/void-linux/void-packages/pull/38438

xbps-src: fetch from CRAN archive
CRAN has a lovely practice of moving the latest releases into an archive
after a new release is made. So when pillar 1.8.0 is released, for
example, version 1.7.0 gets moved into the archive.

Add some logic to fetch from the CRAN archive when this happens.

See below for an example:

```
=> R-cran-pillar-1.7.0_1: fetching distfile 'pillar_1.7.0.tar.gz'...
https://cran.r-project.org/src/contrib/pillar_1.7.0.tar.gz: Not Found
=> R-cran-pillar-1.7.0_1: fetching distfile 'pillar_1.7.0.tar.gz' (from CRAN archive)...
pillar_1.7.0.tar.gz: [517KB 0%] 19KB/s ETA: 00m00s
pillar_1.7.0.tar.gz: [517KB 25%] 201KB/s ETA: 00m02s
pillar_1.7.0.tar.gz: 517KB [avg rate: 788KB/s]
```

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A patch file from https://github.com/void-linux/void-packages/pull/38438.patch is attached

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From 268605b784496b3bc53966c507371125b387a878 Mon Sep 17 00:00:00 2001
From: Cameron Nemo <cnemo@tutanota.com>
Date: Tue, 2 Aug 2022 14:57:56 -0700
Subject: [PATCH] xbps-src: fetch from CRAN archive

CRAN has a lovely practice of moving the latest releases into an archive
after a new release is made. So when pillar 1.6.0 is released, for
example, version 1.5.1 gets moved into the archive.

Add the CRAN archive as a mirror to handle this case.

See below for an example:

=> R-cran-pillar-1.5.1_1: running do-fetch hook: 00-distfiles ...
=> R-cran-pillar-1.5.1_1: fetching distfile 'pillar_1.5.1.tar.gz' from 'https://cran.r-project.org/src/contrib/Archive/pillar'...
---
 common/environment/build-style/R-cran.sh | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/common/environment/build-style/R-cran.sh b/common/environment/build-style/R-cran.sh
index ded66793396b..50c59277e7ba 100644
--- a/common/environment/build-style/R-cran.sh
+++ b/common/environment/build-style/R-cran.sh
@@ -5,4 +5,7 @@ wrksrc="${XBPS_BUILDDIR}/${pkgname#R-cran-}"
 # default to cran
 if [ -z "$distfiles" ]; then
 	distfiles="https://cran.r-project.org/src/contrib/${pkgname#R-cran-}_${version//r/-}.tar.gz"
+	# Old releases get put into archive, and removed from above location.
+	# Use the archive as a fallback to handle that case.
+	XBPS_DISTFILES_MIRROR+=" https://cran.r-project.org/src/contrib/Archive/${pkgname#R-cran-}"
 fi