Can't download anything via wget

[Kakadu]

GNU/Linux, opam 2.5.1

[ERROR] Could not update repository "default": OpamDownload.Download_fail(_, "Download command failed:
        \"/usr/bin/wget --write-out %{http_code}\\\\n --retry 3 --retry-delay 2 --user-agent opam/2.5.1 -L -o
        /tmp/opam-64870-8cf2f1/index.tar.gz.part -- https://se.math.spbu.ru/opam/index.tar.gz\" exited with
        code 2")
'opam update --verbose' failed.

While stracing I got the following message.

read(6, "/usr/bin/wget: unrecognized option '--write-out'\n/usr/bin/wget: option '--retry' is ambiguous; possibilities: '--retry-connrefused' '--retry-on-host-error' '--retry-on-http-error'\n/usr/bin/wget: unrecognized option '--retry-delay'\nUsage: wget [OPTION]... [URL]...\n\nTry `wget --help' for more options.\n", 65536) = 301

Indeed, I can't find --write-out switch on wget manpage, but I does exist on curl manpage. Could it be a source of issue?

[NathanReb]

Thanks for reporting this.

Indeed it seems like we're passing curl command line options down to wget, I'll investigate!

[kit-ty-kate]

Do you not have curl on your system or did you force opam to use wget?
If this is the latter case, how do you force opam to use wget? (OPAMFETCH=wget works fine in our testsuite)

[Kakadu]

Do you not have curl on your system or did you force opam to use wget? If this is the latter case, how do you force opam to use wget? (OPAMFETCH=wget works fine in our testsuite)

It looks like the line download-command: "wget" in ~/.opam/config triggered the bug.
When I removed it everything started to behave OKay.
No idea how this line appeared there...

[kit-ty-kate]

That's really weird. download-command: "wget" should only be able to be added by opam option 'download-command="wget"' and would result in the same fetch error in past versions (i've tested this with 2.1, 2.2, 2.3 and 2.4).

The command that does work however is opam option download-command=wget (wget as a variable instead of as a string, in opam format).
Maybe something transformed the variable format into string somehow? Did you do something with opam recently that could've caused this?

[kit-ty-kate]

opamrc files can also modify that option, in the unlikely chance you're using that

[Kakadu]

Maybe something transformed the variable format into string somehow? Did you do something with opam recently that could've caused this?

I have no chance to remember this. The bug is sitting on my laptop more than a year, and I was always blaming internet provider.

P.S. I'm OK to close this.

[kit-ty-kate]

I'll leave it open for now. It could be a bug from #5492. I'll try to reproduce the issue, if we can't then it should be ok to close it