$ git clone -n https://src.fedoraproject.org/rpms/rust-trybuild2.git /var/lib/mock/f37-build-side-31-rust-devel-124299-6979/root/chroot_tmpdir/scmroot/rust-trybuild2
Cloning into '/var/lib/mock/f37-build-side-31-rust-devel-124299-6979/root/chroot_tmpdir/scmroot/rust-trybuild2'...
$ git reset --hard c055eb2cec3ea9570a392cef88bedf2239f0bb40
HEAD is now at c055eb2 Initial Fedora packaging (rhbz#2148560)