On Fri, Jan 15, 2021 at 09:48:20PM +0100, zimoun wrote:
> On Fri, 15 Jan 2021 at 21:18, Wiktor Żelazny <wz@freeshell.de> wrote:
>
> > A new idea: I just checked “CRAN Time Machine” at MRAN. The tarball with
> > the 0g4mi101srjbl17ydb2hl3854m3xj0llj6861lfr30sp08nkqavl hash is there.
> > I guess I can use `build --with-source=` now, maybe even `environment
> > --with-source=r-foreign=`?
>
> Oh, thanks for the pointer.  Yeah, in this case it is possible to use
> --with-source, maybe combined with another trick to populate your store
> with the expected by d81fb2a tarball.

Hello again,

Unfortunately, it’s not the end of the story:

$ curl -o foreign_0.8-75.tar.gz https://cran.microsoft.com/snapshot/2020-01-27/src/contrib/foreign_0.8-75.tar.gz
$ guix time-machine --commit=d81fb2ae9443994ae5dd1cb5837276fad63f842c --channels=channel-specs.scm -- \
   build --with-source=r-foreign=foreign_0.8-75.tar.gz r-foreign
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
building /gnu/store/xzsw0wiw223s07szh18kqlq2ynmmvlp8-r-foreign-75.drv...
[building]
successfully built /gnu/store/xzsw0wiw223s07szh18kqlq2ynmmvlp8-r-foreign-75.drv
The following graft will be made:
   /gnu/store/ha6y2wpk2a9s237lk8jzhfg9pawfp12v-r-foreign-75.drv
applying 1 graft for /gnu/store/ha6y2wpk2a9s237lk8jzhfg9pawfp12v-r-foreign-75.drv...
grafting '/gnu/store/617x95s9ykd0va7r06g187y3dbwa3ddh-r-foreign-75' -> '/gnu/store/jvh9zyym3xmzy94g37gx5klg8rx72vfj-r-foreign-75'...
successfully built /gnu/store/ha6y2wpk2a9s237lk8jzhfg9pawfp12v-r-foreign-75.drv
/gnu/store/jvh9zyym3xmzy94g37gx5klg8rx72vfj-r-foreign-75

As you can see, there’s “-75” rather than “0.8-75” in the paths. Am I
doing something wrong or, perhaps, is this a Guix bug?

WŻ