[Nix-dev] fetching tarballs recursively

[Sergey Mironov]

Hi! I am managing an nixpkgs branch and this branch become more and
more older. There already were issues where I had to change mirror
urls because of missing sources. I'd like to store as much as possible
into local repository in order to protect myself from such situations.
Is there a way to recursively traverse nix expression tree and collect
(and fetch) all the 'src' tarballs automatically?

Thanks in advance,
Sergey

PS

Once I have the sources, I'll probably do something like

for s in $ALL_SOURCES ; do
nix-store --add $s
done

in order to build my tree without accessing mirrors/upstream ftps