[Rd] Checksums of packages change on CRAN without change in version number

[Joris Meys]

Dear all,

I report the same problem again, as one of our sysadmins at the university
ran into the same issue again. Every so often they find an in-place update
of an R package which almost always amounts to a small change in the
DESCRIPTION file. This does cause the checksums to change, and we end up
with two packages with the exact same version number but different
checksums.

To date there hasn't been any satisfactory answer on how to avoid having to
update our own configuration builds a week after the initial update due to
these stealthy checksum changes.

It's also an increasing safety concern for our IT department, as they
seriously frown upon software that makes in-place changes. According to
them, there's no way they can know whether it is a legitimate change to the
package, or the result of some kind of hack. They have to rely on trust,
which is a dangerous thing to do in an IT context and which they like to
avoid.

github report on the issue (this time it's mgcv) :
https://github.com/easybuilders/easybuild-easyconfigs/pull/7122#pullrequestreview-172031060

Cheers
Joris

-- 
Joris Meys
Statistical consultant

Department of Data Analysis and Mathematical Modelling
Ghent University
Coupure Links 653, B-9000 Gent (Belgium)


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[Rd] Problem building rmarkdown vignettes with child

[Witold E Wolski]

Hello,

This is a problem I posted about already some time ago:
https://stat.ethz.ch/pipermail/r-devel/2018-September/076786.html

Finally, I did had some time to create a minimal package to reproduce
the problem that vignettes with child can not be build.
https://github.com/wolski/RmarkdownVignetteProblem

The problem basically is that while all the vignettes can be build by running

devtools::build_vignettes
or
rmarkdown::render

they will all fail to build when running
devtools::build()
or
R CMD build

except of the
ABVignetteWithLocalChild.Rmd
for which I did apply the workaround suggested by  Duncan in this github issue:
https://github.com/yihui/knitr/issues/1540


Best regards
Witek



-- 
Witold Eryk Wolski

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[Rd] error unserializing ascii format (v2 or v3)

[Michael Sannella via R-devel]

I ran into an interesting error unserializing a file created with
ascii=TRUE:

R 3.5.1 (Windows or Linux):
> unserialize(serialize(list(raw=as.raw(c(39,41))), NULL, version=2,
ascii=TRUE))
Error in unserialize(serialize(list(raw = as.raw(c(39, 41))), NULL,
version = 2,  :
  ReadItem: unknown type 29, perhaps written by later version of R

The same error happens when the serialization is done with version=2
or version=3.  It does not happen if the serialization is done with
ascii=FALSE.

Note that 0x29 == 41.  It looks like unserialize is reading the wrong
line.

I tried this in earlier versions of R on Windows, and the same error
happens in every version from R-2.15.3 (the earliest I have) on up.

  ~~ Michael Sannella

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