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Description of problem:
When running the command below and the file exists curl should report error saying the file already exists and not append to file as it currently does.


Version-Release number of selected component (if applicable):
curl-7.61.1-7.el8.x86_64

How reproducible:
100%

Steps to Reproduce:
1. curl --retry 5 --insecure --fail --location --show-error --remote-name --remote-header-name "https://copr.fedorainfracloud.org/coprs/mvadkert/beakerlib-libraries/repo/fedora-rawhide/mvadkert-beakerlib-libraries-fedora-rawhide.repo"

2. curl --retry 5 --insecure --fail --location --show-error --remote-name --remote-header-name "https://copr.fedorainfracloud.org/coprs/mvadkert/beakerlib-libraries/repo/fedora-rawhide/mvadkert-beakerlib-libraries-fedora-rawhide.repo"

3. cat mvadkert-beakerlib-libraries.repo 
[mvadkert-beakerlib-libraries]
name=Copr repo for beakerlib-libraries owned by mvadkert
baseurl=https://copr-be.cloud.fedoraproject.org/results/mvadkert/beakerlib-libraries/fedora-rawhide-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/mvadkert/beakerlib-libraries/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1[mvadkert-beakerlib-libraries]
name=Copr repo for beakerlib-libraries owned by mvadkert
baseurl=https://copr-be.cloud.fedoraproject.org/results/mvadkert/beakerlib-libraries/fedora-rawhide-$basearch/
type=rpm-md
skip_if_unavailable=True
gpgcheck=1
gpgkey=https://copr-be.cloud.fedoraproject.org/results/mvadkert/beakerlib-libraries/pubkey.gpg
repo_gpgcheck=0
enabled=1
enabled_metadata=1

Actual results:
the content of mvadkert-beakerlib-libraries.repo is duplicated as curl appended the file.

Expected results:
The second time the command is run it should return error informing the file already exists

Additional info:
related to Fedora BZ#1658574

Thanks!  I was about to clone this myself...