В Fri, 13 Sep 2024 15:00:06 +0200
Iago Bonnici <iago.bonn...@umontpellier.fr> пишет:
> - Is the 100-bytes paths limitation only supposed to ensure
> compatilbility with pre-POSIX.1-1998 `tar` files?
There are also the Windows systems. While support for paths longer than
260 characters appeared in Windows 10 build 1607 and exists in modern
versions of R [*], it's not enabled by default on many current systems:
d <- tempfile(); dir.create(d); setwd(d); d
"C:\\Users\\[SNIP]\\AppData\\Local\\Temp\\3\\RtmpodtJLb\\file3fec5fce5feb"
(path <- paste(
sample(
c('/', letters, LETTERS),
256, TRUE,
c(.05, rep((1-.05)/52, 52))
),
collapse = ''
))
"nJpmTZvEleQsFrgjFzvaNRVHGzSIIgERElnFRRmVKpoZkBkfGJlUpnnPaWYhpELTCQ/djTwBiKCvuG/gEjjnRjisLG/sjfayxYXQCycnU/Uu/xcPhMUCwtFOlttgP/OfWKDZJSjmXgAvIyCVCQmIeUXjvGmntEiSqlUqzZOGQRASSMjUHUN/mdTFWuOlIxy/flbyKhKQnjFEIZrowuswFBWLmMmJNHOfRZLeLtDbOlpR/IdycTiIblkYQS/MYawp"
(dir.create(path, recursive = TRUE))
# [1] FALSE
# Warning message:
# In dir.create(path, recursive = TRUE) :
# cannot create dir
'nJpmTZvEleQsFrgjFzvaNRVHGzSIIgERElnFRRmVKpoZkBkfGJlUpnnPaWYhpELTCQ\djTwBiKCvuG\gEjjnRjisLG\sjfayxYXQCycnU\Uu\xcPhMUCwtFOlttgP\OfWKDZJSjmXgAvIyCVCQmIeUXjvGmntEiSqlUqzZOGQRASSMjUHUN\mdTFWuOlIxy',
reason 'No such file or directory'
sessionInfo()
# R version 4.3.2 (2023-10-31 ucrt)
# Platform: x86_64-w64-mingw32/x64 (64-bit)
# Running under: Windows Server 2022 x64 (build 20348)
As a test, I have prepared a source package with an exactly 256-byte
maximal path length:
untar('foo_1.0.tar.gz', list = TRUE) |> nchar() |> max()
# [1] 256
I was not able to install it with the internal untar() ("ERROR:
extracted multiple files from ‘foo_1.0.tar.gz’" -- it seems to have
extracted both the long path from the GNU extension and the "dummy"
path stored in the 100-octet 'name' field), but it did work with the
R_INSTALL_TAR='tar' environment variable on Linux. On Windows, it
failed to extract the tarball in a manner similar to the first
experiment when the total path length exceeded 260.
--
Best regards,
Ivan
[*]
https://blog.r-project.org/2023/03/07/path-length-limit-on-windows/index.html
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