$ dget -u http://ftp.debian.org/debian//pool/main/d/dgit/dgit_0.22.dsc
dget: retrieving http://ftp.debian.org/debian//pool/main/d/dgit/dgit_0.22.dsc
...
dpkg-source: info: extracting dgit in dgit-0.22
dpkg-source: info: unpacking dgit_0.22.tar.gz
$ cd dgit-0.22/
$ ls
debian/  dgit*  dgit.1  dgit-repos-server*  Makefile  NOTES  tests/
$