$ git clone -n https://src.fedoraproject.org/rpms/texlive.git /var/lib/mock/f42-build-3427565-45332/root/chroot_tmpdir/scmroot/texlive
Cloning into '/var/lib/mock/f42-build-3427565-45332/root/chroot_tmpdir/scmroot/texlive'...
$ git fetch origin 2ac994c1cad9c8143c011a18d549a5717db40271:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/texlive
 * [new ref]         2ac994c1cad9c8143c011a18d549a5717db40271 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  88% (37/42)
Updating files:  90% (38/42)
Updating files:  92% (39/42)
Updating files:  95% (40/42)
Updating files:  97% (41/42)
Updating files: 100% (42/42)
Updating files: 100% (42/42), done.
HEAD is now at 2ac994c Fixed rhbz#2271057 - Upgrade biblatex to 3.20