$ git clone -n https://src.fedoraproject.org/rpms/perl-Compress-Bzip2.git /var/lib/mock/f41-build-815851-149783/root/chroot_tmpdir/scmroot/perl-Compress-Bzip2
Cloning into '/var/lib/mock/f41-build-815851-149783/root/chroot_tmpdir/scmroot/perl-Compress-Bzip2'...
$ git fetch origin cbb87b58686b532430b35a0121bb58803608c059:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Compress-Bzip2
 * [new ref]         cbb87b58686b532430b35a0121bb58803608c059 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cbb87b5 Perl 5.40 rebuild