fetching a file with hash HASH of type TYPE, we first try to
download <base-url>/<type>/<hash>, where <base-url> is one of a list
of mirrors. For instance, given
src = fetchurl {
url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/2.0.0.6/source/firefox-2.0.0.6-source.tar.bz2;
sha1 = "eb72f55e4a8bf08e8c6ef227c0ade3d068ba1082";
};
and the mirror list [http://nix.cs.uu.nl/dist/tarballs], we first
try to download
eb72f55e4a
and if that fails, we use the original URL.
The list of mirrors is not yet user-configurable.
* `fetchurl' now also accepts an argument `urls' instead of `url' for
a list of alternative download locations, which fetchurl will try in
sequence.
svn path=/nixpkgs/trunk/; revision=9190
74 lines
1.8 KiB
Bash
74 lines
1.8 KiB
Bash
source $stdenv/setup
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header "downloading file $name with $outputHashAlgo hash $outputHash..."
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# Curl flags to handle redirects, not use EPSV, handle cookies for
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# servers to need them during redirects, and work on SSL without a
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# certificate (this isn't a security problem because we check the
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# cryptographic hash of the output anyway).
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curl="curl \
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--location --max-redirs 20 \
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--disable-epsv \
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--cookie-jar cookies \
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--insecure"
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tryDownload() {
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local url="$1"
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echo
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header "trying $url"
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success=
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if $curl --fail "$url" --output "$out"; then
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success=1
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fi
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stopNest
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}
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finish() {
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# On old versions of Nix, verify the hash of the output. On newer
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# versions, Nix verifies the hash itself.
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if test "$NIX_OUTPUT_CHECKED" != "1"; then
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if test "$outputHashAlgo" != "md5"; then
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echo "hashes other than md5 are unsupported in Nix <= 0.7, upgrade to Nix 0.8"
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exit 1
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fi
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actual=$(md5sum -b "$out" | cut -c1-32)
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if test "$actual" != "$id"; then
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echo "hash is $actual, expected $id"
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exit 1
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fi
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fi
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stopNest
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exit 0
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}
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for mirror in $hashedMirrors; do
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url="$mirror/$outputHashAlgo/$outputHash"
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if $curl --fail --silent --show-error --head "$url" \
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--write-out "%{http_code}" --output /dev/null > code 2> log; then
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tryDownload "$url"
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if test -n "$success"; then finish; fi
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else
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# Be quiet about 404 errors, which we interpret as the file
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# not being present on this particular mirror.
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if test "$(cat code)" != 404; then
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echo "error checking the existence of $url:"
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cat log
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fi
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fi
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done
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success=
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for url in $urls; do
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tryDownload "$url"
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if test -n "$success"; then finish; fi
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done
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echo "error: cannot download $name from any mirror"
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exit 1
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