$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-Libxml2.git /var/lib/mock/f40-build-770771-125885/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2
Cloning into '/var/lib/mock/f40-build-770771-125885/root/chroot_tmpdir/scmroot/perl-Alien-Libxml2'...
$ git reset --hard 2b743acddf734714de7f6778c382941f009752e9
HEAD is now at 2b743ac Rebuild against libxml2-2.12.3 (rhbz#2253557)