v1.3.1 - fails to parse empty gzipped files

[jemunro]

I have noted the following difference in behaviour of readr v1.1.1 and readr v1.3.0 when handling empty gzipped files.

readr v1.1.1

printf '' > empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt')"

# A tibble: 0 x 0

gzip empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt.gz')"

# A tibble: 0 x 0

readr v1.3.1

printf '' > empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt')"

# A tibble: 0 x 0

gzip empty.txt
R --slave --vanilla -e "readr::read_tsv('empty.txt.gz')"

Error in guess_header_(datasource, tokenizer, locale) :
  Cannot read file /tmp/RtmpnGGnIo/file4c96730e72d7: Invalid argument
Calls: <Anonymous> ... col_spec_standardise -> guess_header -> guess_header_
Execution halted

[pralitp]

I am running into a similar issue. I wonder if the underlying issue comes from trying to read from an empty connection. Here is a simplified example:

> test <- readr::read_csv("empty.csv")
> test
# A tibble: 0 x 0
> conn <- file("empty.csv")
> test <- readr::read_csv(conn)
Error in guess_header_(datasource, tokenizer, locale) : 
  Cannot read file /private/var/folders/db/txjmp0ms653f_z_6yj2hk8880000gn/T/Rtmpuiadeb/fileb1c027e27ffe: Invalid argument

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/