$ git clone -n https://src.fedoraproject.org/rpms/perl-Alien-LibGumbo.git /var/lib/mock/f39-build-1440943-32359/root/chroot_tmpdir/scmroot/perl-Alien-LibGumbo
Cloning into '/var/lib/mock/f39-build-1440943-32359/root/chroot_tmpdir/scmroot/perl-Alien-LibGumbo'...
$ git fetch origin c720c89c6170de318d4ca292163cf18d10b3bd9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Alien-LibGumbo
 * [new ref]         c720c89c6170de318d4ca292163cf18d10b3bd9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c720c89 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild