$ git clone -n https://src.fedoraproject.org/rpms/postgresql15.git /var/lib/mock/f40-build-780137-130690/root/chroot_tmpdir/scmroot/postgresql15
Cloning into '/var/lib/mock/f40-build-780137-130690/root/chroot_tmpdir/scmroot/postgresql15'...
$ git fetch origin 4aaa53d17cbd4ffe63a814368cc61e1b445a3c7b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/postgresql15
 * [new ref]         4aaa53d17cbd4ffe63a814368cc61e1b445a3c7b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4aaa53d Fix FTBFS with libxml2