$ git clone -n https://src.fedoraproject.org/rpms/rust-pbkdf2.git /var/lib/mock/f38-build-side-43-rust-devel-1417535-31459/root/chroot_tmpdir/scmroot/rust-pbkdf2
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1417535-31459/root/chroot_tmpdir/scmroot/rust-pbkdf2'...
$ git fetch origin 80a4929de24f4d0f1bcb732f7f21799c9366d4af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pbkdf2
 * [new ref]         80a4929de24f4d0f1bcb732f7f21799c9366d4af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 80a4929 Update to version 0.12.2; Fixes RHBZ#2221388