138 lines
3.3 KiB
Bash
138 lines
3.3 KiB
Bash
source $stdenv/setup
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source $mirrorsFile
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# Curl flags to handle redirects, not use EPSV, handle cookies for
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# servers to need them during redirects, and work on SSL without a
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# certificate (this isn't a security problem because we check the
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# cryptographic hash of the output anyway).
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curl="curl \
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--location --max-redirs 20 \
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--retry 3
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--disable-epsv \
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--cookie-jar cookies \
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--insecure \
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$NIX_CURL_FLAGS"
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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 $id"
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exit 1
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fi
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fi
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stopNest
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exit 0
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}
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tryHashedMirrors() {
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if test -n "$NIX_HASHED_MIRRORS"; then
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hashedMirrors="$NIX_HASHED_MIRRORS"
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fi
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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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}
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# URL list may contain ?. No glob expansion for that, please
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set -o noglob
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urls2=
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for url in $urls; do
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if test "${url:0:9}" != "mirror://"; then
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urls2="$urls2 $url"
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else
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url2="${url:9}"; echo "${url2/\// }" > split; read site fileName < split
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#varName="mirror_$site"
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varName="$site" # !!! danger of name clash, fix this
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if test -z "${!varName}"; then
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echo "warning: unknown mirror:// site \`$site'"
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else
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# Assume that SourceForge/GNU/kernel mirrors have better
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# bandwidth than nixos.org.
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preferHashedMirrors=
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mirrors=${!varName}
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# Allow command-line override by setting NIX_MIRRORS_$site.
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varName="NIX_MIRRORS_$site"
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if test -n "${!varName}"; then mirrors="${!varName}"; fi
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for url3 in $mirrors; do
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urls2="$urls2 $url3$fileName";
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done
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fi
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fi
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done
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urls="$urls2"
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# Restore globbing settings
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set +o noglob
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if test -n "$showURLs"; then
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echo "$urls" > $out
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exit 0
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fi
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if test -n "$preferHashedMirrors"; then
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tryHashedMirrors
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fi
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# URL list may contain ?. No glob expansion for that, please
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set -o noglob
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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 "$success"; then finish; fi
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done
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# Restore globbing settings
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set +o noglob
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if test -z "$preferHashedMirrors"; then
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tryHashedMirrors
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fi
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echo "error: cannot download $name from any mirror"
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exit 1
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