$ git clone -n https://src.fedoraproject.org/rpms/rust-gtk3-macros0.15.git /var/lib/mock/f41-build-1197637-22347/root/chroot_tmpdir/scmroot/rust-gtk3-macros0.15
Cloning into '/var/lib/mock/f41-build-1197637-22347/root/chroot_tmpdir/scmroot/rust-gtk3-macros0.15'...
$ git fetch origin 2c12b15f14885a5c2b981849603fe66589f7f78f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gtk3-macros0.15
 * [new ref]         2c12b15f14885a5c2b981849603fe66589f7f78f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c12b15 compat package no longer needed