On 05/31/2017 04:38 AM, Patrick Connolly wrote:
On Tue, 23-May-2017 at 12:20PM +0200, Martin Maechler wrote:
[...]
|>
|> Given the above stack trace.
|> It may be easier to just do
|>
|> debugonce(available.packages)
|> install.packages("withr")
|>
|> and then inside available.packages, (using 'n') step to the
|> point _before_ the tryCatch(...) call happens; there, e.g. use
|>
|> ls.str()
|>
|> which gives an str() of all your local objects, notably 'dest'
|> and 'method'.
|> but you can also try other things once inside
|> available.packages().
I couldn't see any differences between R-3.3.3 (which works) and
R-3.4.0 (which doesn't) until I got to here, a few lines before the
download.file line:
Browse[2]>
debug: dest <- file.path(tempdir(), paste0("repos_", URLencode(repos,
TRUE), ".rds"))
Browse[2]>
When I check out those directories in a terminal, there's a big diffrence:
With R-3.4.0
~ > ll /tmp/RtmpFUhtpY
total 4
drwxr-xr-x 2 hrapgc hrapgc 4096 May 31 10:45 downloaded_packages/
-rw-r--r-- 1 hrapgc hrapgc 0 May 31 10:56
repos_http%3A%2F%2Fcran.stat.auckland.ac.nz%2Fsrc%2Fcontrib.rds
The file repos_http%3A%2F%2Fcran.stat.auckland.ac.nz%2Fsrc%2Fcontrib.rds
was likely created earlier in your R session. Likely the download a few
lines down
download.file(url = paste0(repos, "/PACKAGES.rds"),
destfile = dest, method = method,
cacheOK = FALSE, quiet = TRUE, mode =
"wb")
'succeeded' but created a zero-length file.
You could try to troubleshoot this with something like the following,
downloading to a temporary location
dest = tempfile()
url = "http://cran.stat.auckland.ac.nz/src/contrib/PACKAGES.rds";
download.file(url, dest)
file.size(dest)
If this succeeds (it should download a file of several hundred KB), then
try adding the options method, cacheOK, quiet, mode to the
download.file() call. 'method' can be determined when you are in
available.packages while debugging; if R says that it is missing, then
it will be assigned, in download.file, to either
getOption("download.file.method") or (if the option is NULL or "auto")
"libcurl".
If the download 'succeeds' but the temporary file created is 0 bytes,
then it would be good to share the problematic command with us.
Martin Morgan
With R-3.3.3
~ > ll /tmp/RtmpkPgL3A
total 380
drwxr-xr-x 2 hrapgc hrapgc 4096 May 31 11:01 downloaded_packages/
-rw-r--r-- 1 hrapgc hrapgc 8214 May 31 11:01 libloc_185_3165c7f52d5fdf96.rds
-rw-r--r-- 1 hrapgc hrapgc 372263 May 31 11:01
repos_http%3A%2F%2Fcran.stat.auckland.ac.nz%2Fsrc%2Fcontrib.rds
So, if I could figure out what makes *that* difference I could get
somewhere. I see there's considerably extra code in the newer of the
two versions of available.packages() but being a bear with a small
brain, I can't figure out what differences should be expected. I have
no idea what populates those 'dest' directories.
TIA
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