$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-UnixCrypt_XS.git /var/lib/mock/f45-build-22664-593/root/chroot_tmpdir/scmroot/perl-Crypt-UnixCrypt_XS
Cloning into '/var/lib/mock/f45-build-22664-593/root/chroot_tmpdir/scmroot/perl-Crypt-UnixCrypt_XS'...
$ git fetch origin 77131785738452c58218fe2f6a9557d67f37947f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-UnixCrypt_XS
 * [new ref]         77131785738452c58218fe2f6a9557d67f37947f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7713178 Perl 5.44 rebuild