$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Regexp-Pattern.git /var/lib/mock/f45-build-26787-619/root/chroot_tmpdir/scmroot/perl-Test-Regexp-Pattern
Cloning into '/var/lib/mock/f45-build-26787-619/root/chroot_tmpdir/scmroot/perl-Test-Regexp-Pattern'...
$ git fetch origin a26268b26362e60024ff4913db98d07f9d4fe108:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Regexp-Pattern
 * [new ref]         a26268b26362e60024ff4913db98d07f9d4fe108 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a26268b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild