$ git clone -n https://src.fedoraproject.org/rpms/glycin-loaders.git /var/lib/mock/f39-build-1672119-40869/root/chroot_tmpdir/scmroot/glycin-loaders
Cloning into '/var/lib/mock/f39-build-1672119-40869/root/chroot_tmpdir/scmroot/glycin-loaders'...
$ git fetch origin d038e315f9ace6d01e55f60ca2d2178abe9422b7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glycin-loaders
 * [new ref]         d038e315f9ace6d01e55f60ca2d2178abe9422b7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d038e31 Enable glycin-heif loader