source $stdenv/setup source $mirrorsFile # Curl flags to handle redirects, not use EPSV, handle cookies for # servers to need them during redirects, and work on SSL without a # certificate (this isn't a security problem because we check the # cryptographic hash of the output anyway). curl="curl \ --location --max-redirs 20 \ --retry 3 --disable-epsv \ --cookie-jar cookies \ --insecure \ $NIX_CURL_FLAGS" tryDownload() { local url="$1" echo header "trying $url" success= if $curl --fail "$url" --output "$out"; then success=1 fi stopNest } finish() { # On old versions of Nix, verify the hash of the output. On newer # versions, Nix verifies the hash itself. if test "$NIX_OUTPUT_CHECKED" != "1"; then if test "$outputHashAlgo" != "md5"; then echo "hashes other than md5 are unsupported in Nix <= 0.7, upgrade to Nix 0.8" exit 1 fi actual=$(md5sum -b "$out" | cut -c1-32) if test "$actual" != "$id"; then echo "hash is $actual, expected $id" exit 1 fi fi stopNest exit 0 } tryHashedMirrors() { if test -n "$NIX_HASHED_MIRRORS"; then hashedMirrors="$NIX_HASHED_MIRRORS" fi for mirror in $hashedMirrors; do url="$mirror/$outputHashAlgo/$outputHash" if $curl --fail --silent --show-error --head "$url" \ --write-out "%{http_code}" --output /dev/null > code 2> log; then tryDownload "$url" if test -n "$success"; then finish; fi else # Be quiet about 404 errors, which we interpret as the file # not being present on this particular mirror. if test "$(cat code)" != 404; then echo "error checking the existence of $url:" cat log fi fi done } # URL list may contain ?. No glob expansion for that, please set -o noglob urls2= for url in $urls; do if test "${url:0:9}" != "mirror://"; then urls2="$urls2 $url" else url2="${url:9}"; echo "${url2/\// }" > split; read site fileName < split #varName="mirror_$site" varName="$site" # !!! danger of name clash, fix this if test -z "${!varName}"; then echo "warning: unknown mirror:// site \`$site'" else # Assume that SourceForge/GNU/kernel mirrors have better # bandwidth than nixos.org. preferHashedMirrors= mirrors=${!varName} # Allow command-line override by setting NIX_MIRRORS_$site. varName="NIX_MIRRORS_$site" if test -n "${!varName}"; then mirrors="${!varName}"; fi for url3 in $mirrors; do urls2="$urls2 $url3$fileName"; done fi fi done urls="$urls2" # Restore globbing settings set +o noglob if test -n "$showURLs"; then echo "$urls" > $out exit 0 fi if test -n "$preferHashedMirrors"; then tryHashedMirrors fi # URL list may contain ?. No glob expansion for that, please set -o noglob success= for url in $urls; do tryDownload "$url" if test -n "$success"; then finish; fi done # Restore globbing settings set +o noglob if test -z "$preferHashedMirrors"; then tryHashedMirrors fi echo "error: cannot download $name from any mirror" exit 1