$ git clone -n https://git.centos.org/rpms/thunderbird /var/lib/mock/dist-c8-updates-build-73717-24204/root/chroot_tmpdir/scmroot/thunderbird
Cloning into '/var/lib/mock/dist-c8-updates-build-73717-24204/root/chroot_tmpdir/scmroot/thunderbird'...
$ git reset --hard 4add1b1600e00e4c2badc9180694f6eea9a747a0
HEAD is now at 4add1b1 enable openpgp support for thunderbird