nixpkgs/pkgs/applications/science/math/sage/fetch-mirrors.sh

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#! /usr/bin/env nix-shell
#! nix-shell -i bash -p curl go-pup
# Fetches a list of all available source mirrors from the sage homepage.
# Note that the list is sorted by country, but fetchurl doesn't offer an option
# to customize mirror preference.
curl -s http://www.sagemath.org/download-source.html \
| pup 'table#mirror' \
| pup 'a attr{href}' \
| sed -e 's/index\.html/sage-${version}.tar.gz/'