$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-chroma-2.git /var/lib/mock/f40-build-2209693-52163/root/chroot_tmpdir/scmroot/golang-github-alecthomas-chroma-2
Cloning into '/var/lib/mock/f40-build-2209693-52163/root/chroot_tmpdir/scmroot/golang-github-alecthomas-chroma-2'...
$ git fetch origin 49f77ecedb6c1c9cb793833e9727499e16d06132:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-chroma-2
 * [new ref]         49f77ecedb6c1c9cb793833e9727499e16d06132 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49f77ec Update to 2.12.0