$ git clone -n https://src.fedoraproject.org/rpms/rubygem-asciidoctor-pdf.git /var/lib/mock/f41-build-746267-13353/root/chroot_tmpdir/scmroot/rubygem-asciidoctor-pdf
Cloning into '/var/lib/mock/f41-build-746267-13353/root/chroot_tmpdir/scmroot/rubygem-asciidoctor-pdf'...
$ git fetch origin 1551e63a5be6d0b43acf278931aee4c54f0d0d96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-asciidoctor-pdf
 * [new ref]         1551e63a5be6d0b43acf278931aee4c54f0d0d96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1551e63 fix: missing sources