$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Trim.git /var/lib/mock/f45-build-26409-617/root/chroot_tmpdir/scmroot/perl-String-Trim
Cloning into '/var/lib/mock/f45-build-26409-617/root/chroot_tmpdir/scmroot/perl-String-Trim'...
$ git fetch origin f106e0bc4175e57e76d1fa26fd586f2068540196:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Trim
 * [new ref]         f106e0bc4175e57e76d1fa26fd586f2068540196 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f106e0b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild