$ git clone -n https://src.fedoraproject.org/rpms/ghc-yesod-core.git /var/lib/mock/f38-build-720641-97817/root/chroot_tmpdir/scmroot/ghc-yesod-core
Cloning into '/var/lib/mock/f38-build-720641-97817/root/chroot_tmpdir/scmroot/ghc-yesod-core'...
$ git fetch origin 3c04dbbefde8465fea1afce98bde48651f14db11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-yesod-core
 * [new ref]         3c04dbbefde8465fea1afce98bde48651f14db11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c04dbb Convert to %autorelease and %autochangelog