Just noticed this when nuking my DB and running prepare-dev.py.

I was seeing:

Using Djblets media from /media/Projects/djblets/djblets/media
Traceback (most recent call last):
  File "./contrib/internal/prepare-dev.py", line 145, in <module>
    main()
  File "./contrib/internal/prepare-dev.py", line 132, in main
    install_media(site)
  File "./contrib/internal/prepare-dev.py", line 76, in install_media
    site.link_pkg_dir("djblets", "media", os.path.join(media_path, "djblets"))
  File "/media/Projects/reviewboard/reviewboard/cmdline/rbsite.py", line 506, in link_pkg_dir
    os.symlink(src_dir, dest_dir)
OSError: [Errno 2] No such file or directory

Apparently, link_pkg_dir was attempting to create the media folder at htdocs/media/djblets instead of reviewboard/htdocs/media/djblets.

Just tested locally.  prepare-dev.py runs correctly and created my development environment successfully.