$ git clone -n https://src.fedoraproject.org/rpms/rubygem-bcrypt_pbkdf.git /var/lib/mock/f40-build-733936-105578/root/chroot_tmpdir/scmroot/rubygem-bcrypt_pbkdf
Cloning into '/var/lib/mock/f40-build-733936-105578/root/chroot_tmpdir/scmroot/rubygem-bcrypt_pbkdf'...
$ git fetch origin 3c7174e0425a5013ecb8d7960932293d07149bfa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-bcrypt_pbkdf
 * [new ref]         3c7174e0425a5013ecb8d7960932293d07149bfa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c7174e Make testsuite compat with minitest 5.19+