$ git clone -n https://github.com/xcp-ng-rpms/kernel-alt.git /var/lib/mock/v8.1-testing-2808-2278/root/chroot_tmpdir/scmroot/kernel-alt
Cloning into '/var/lib/mock/v8.1-testing-2808-2278/root/chroot_tmpdir/scmroot/kernel-alt'...
$ git reset --hard f5720f725715cc2711771b63b00fee1c053cf90e
Downloading SOURCES/kernel-4.19.19.tar.gz (161 MB)
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Checking out files: 100% (325/325), done.
HEAD is now at f5720f7 Fix https://github.com/xcp-ng/xcp/issues/468