$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Libxml2.git /var/lib/mock/f37-build-679432-76606/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2
Cloning into '/var/lib/mock/f37-build-679432-76606/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2'...
$ git reset --hard ff901c0e15ebe4034ffe3d5559163886deeaf674
HEAD is now at ff901c0 Rebuild against libxml2-2.10.3