$ git clone -n https://src.fedoraproject.org/rpms/golang-github-gabriel-vasile-mimetype.git /var/lib/mock/f40-build-2000381-44457/root/chroot_tmpdir/scmroot/golang-github-gabriel-vasile-mimetype
Cloning into '/var/lib/mock/f40-build-2000381-44457/root/chroot_tmpdir/scmroot/golang-github-gabriel-vasile-mimetype'...
$ git fetch origin 5bfc5348b0eb71f805ba9f51b0d54b033d6220fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-gabriel-vasile-mimetype
 * [new ref]         5bfc5348b0eb71f805ba9f51b0d54b033d6220fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5bfc534 Update to 1.4.3 - Closes rhbz#2244095