[Rd] missing binaries in R-devel windows snapshot 78175

[Martin Maechler]

>>>>> Jeroen Ooms 
>>>>>     on Fri, 10 Apr 2020 08:54:39 +0200 writes:

    > On Fri, Apr 10, 2020 at 2:42 AM Bravington, Mark (Data61,
    > Hobart) <Mark.Bravington using data61.csiro.au> wrote:
    >> 
    >> > On Thu, Apr 9, 2020 at 12:44 PM Bravington, Mark
    >> (Data61, Hobart) > <Mark.Bravington using data61.csiro.au>
    >> wrote:
    >> > >
    >> > > The "r-devel snapshot build" 78175 on Windows--- a
    >> dot-exe installer--- seems to be missing a couple of
    >> files in its bin/i386 folder: Rterm.exe and
    >> Rgui.exe. Both are present in its bin/x64 folder (and in
    >> the i386 folder for current R).
    >> 
    >> From: Jeroen Ooms <jeroen using berkeley.edu> Sent: Thursday, 9
    >> April 2020 21:32 To: Bravington, Mark (Data61, Hobart)
    >> Cc: R-Devel-2 Subject: Re: [Rd] missing binaries in
    >> R-devel windows snapshot 78175
    >> 
    >> 
    >> > I just tested this and as far as I can tell there are
    >> no missing > files. Are you sure there isn't a local
    >> problem with your system > permissions or antivirus that
    >> is removing the files?
    >> 
    >> You're quite right--- my apologies. I've been Cylanced
    >> (without it having the politeness to actually tell me,
    >> grrrr). I tried again with the 78172 build that you used,
    >> and the two dot-exe files are there immediately after
    >> installation--- but 10 minutes later they're gone. One
    >> question below about the md5 stuff, though:
    >> 
    >> > Try to verify the md5 of the installer; some enterprise
    >> firewalls are > tampering with downloads:
    >> 
    >> >
    >> openssl::md5(url('https://cran.r-project.org/bin/windows/base/R-devel-win.exe'))
    >> >
    >> readLines('https://cran.r-project.org/bin/windows/base/md5sum.txt.R-devel')
    >> 
    >> Thanks for the tip. I did that, and both give the same
    >> output. But:
    >> 
    >> - If I run 'md5sum' on my local copy of the 78182
    >> installer (ie the file I've just downloaded) I again get
    >> the same signature as per your two lines. (It's not the
    >> firewall, it's Cylance.)
    >> 
    >> - Yet if I run 'openssl::md5( <local copy of installer>)'
    >> I get a different signature!

    > I think you're calculating the md5 of the filename, not
    > the file. You need to use:

    >   openssl::md5(file("R-devel-win.exe"))

or use base R's    tools::md5sum(<local-file-name>)

md5sum() has existed forever, but needs you to do the
download.file() step  which is indirectly happening in
openssl::md5() also.