* nix-prefetch-url: rewritten in Perl.
This commit is contained in:
Eelco Dolstra
parent
92d6a5ed73
commit
3964d95abf
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@ -1,165 +1,128 @@
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#! @shell@ -e
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#! @perl@ -w @perlFlags@
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url=$1
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expHash=$2
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use strict;
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use File::Basename;
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use File::Temp qw(tempdir);
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use File::stat;
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use Nix::Store;
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use Nix::Config;
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binDir=@bindir@
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if [ -n "$NIX_BIN_DIR" ]; then binDir="$NIX_BIN_DIR"; fi
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my $url = shift;
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my $expHash = shift;
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my $hashType = $ENV{'NIX_HASH_ALGO'} || "sha256";
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my $cacheDir = $ENV{'NIX_DOWNLOAD_CACHE'};
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# needed to make it work on NixOS
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export PATH=$PATH:@coreutils@
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if (!defined $url || $url eq "") {
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print STDERR <<EOF
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Usage: nix-prefetch-url URL [EXPECTED-HASH]
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EOF
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;
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exit 1;
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}
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hashType=$NIX_HASH_ALGO
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if test -z "$hashType"; then
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hashType=sha256
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fi
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sub writeFile {
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my ($fn, $s) = @_;
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open TMP, ">$fn" or die;
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print TMP "$s" or die;
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close TMP or die;
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}
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hashFormat=
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if test "$hashType" != "md5"; then
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hashFormat=--base32
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fi
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sub readFile {
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local $/ = undef;
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my ($fn) = @_;
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open TMP, "<$fn" or die;
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my $s = <TMP>;
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close TMP or die;
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return $s;
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}
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if test -z "$url"; then
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echo "syntax: nix-prefetch-url URL [EXPECTED-HASH]" >&2
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exit 1
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fi
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my $tmpDir = tempdir("nix-prefetch-url.XXXXXX", CLEANUP => 1, TMPDIR => 1)
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or die "cannot create a temporary directory";
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# Hack to support the mirror:// scheme from Nixpkgs.
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if ($url =~ /^mirror:\/\//) {
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system("$Nix::Config::binDir/nix-build '<nixpkgs>' -A resolveMirrorURLs --argstr url '$url' -o $tmpDir/urls > /dev/null") == 0
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or die "$0: nix-build failed; maybe \$NIX_PATH is not set properly\n";
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my @expanded = split ' ', readFile("$tmpDir/urls");
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die "$0: cannot resolve ‘$url’" unless scalar @expanded > 0;
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print STDERR "$url expands to $expanded[0]\n";
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$url = $expanded[0];
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}
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# Handle escaped characters in the URI. `+', `=' and `?' are the only
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# characters that are valid in Nix store path names but have a special
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# meaning in URIs.
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name=$(basename "$url" | @sed@ -e 's/%2b/+/g' -e 's/%3d/=/g' -e 's/%3f/\?/g')
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if test -z "$name"; then echo "invalid url"; exit 1; fi
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my $name = basename $url;
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die "cannot figure out file name for ‘$url’\n" if $name eq "";
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$name =~ s/%2b/+/g;
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$name =~ s/%3d/=/g;
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$name =~ s/%3f/?/g;
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my $finalPath;
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my $hash;
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# If the hash was given, a file with that hash may already be in the
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# store.
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if test -n "$expHash"; then
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finalPath=$($binDir/nix-store --print-fixed-path "$hashType" "$expHash" "$name")
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if ! $bindir/nix-store --check-validity "$finalPath" 2> /dev/null; then
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finalPath=
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fi
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hash=$expHash
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fi
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mkTempDir() {
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if test -n "$tmpPath"; then return; fi
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local i=0
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while true; do
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if test -z "$TMPDIR"; then TMPDIR=/tmp; fi
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tmpPath=$TMPDIR/nix-prefetch-url-$$-$i
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if mkdir "$tmpPath"; then break; fi
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# !!! to bad we can't check for ENOENT in mkdir, so this check
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# is slightly racy (it bombs out if somebody just removed
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# $tmpPath...).
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if ! test -e "$tmpPath"; then exit 1; fi
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i=$((i + 1))
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done
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trap removeTempDir EXIT SIGINT SIGQUIT
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if (defined $expHash) {
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$finalPath = makeFixedOutputPath(0, $hashType, $expHash, $name);
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if (isValidPath($finalPath)) { $hash = $expHash; } else { $finalPath = undef; }
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}
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removeTempDir() {
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if test -n "$tmpPath"; then
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rm -rf "$tmpPath" || true
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fi
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}
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doDownload() {
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@curl@ $cacheFlags --fail --location --max-redirs 20 --disable-epsv \
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--cookie-jar $tmpPath/cookies "$url" -o $tmpFile
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}
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# Hack to support the mirror:// scheme from Nixpkgs.
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if test "${url:0:9}" = "mirror://"; then
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if test -z "$NIXPKGS_ALL"; then
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echo "Resolving mirror:// URLs requires Nixpkgs. Please point \$NIXPKGS_ALL at a Nixpkgs tree." >&2
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exit 1
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fi
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mkTempDir
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nix-build "$NIXPKGS_ALL" -A resolveMirrorURLs --argstr url "$url" -o $tmpPath/urls > /dev/null
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expanded=($(cat $tmpPath/urls))
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if test "${#expanded[*]}" = 0; then
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echo "$0: cannot resolve $url." >&2
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exit 1
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fi
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echo "$url expands to ${expanded[*]} (using ${expanded[0]})" >&2
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url="${expanded[0]}"
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fi
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# If we don't know the hash or a file with that hash doesn't exist,
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# download the file and add it to the store.
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if test -z "$finalPath"; then
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if (!defined $finalPath) {
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mkTempDir
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tmpFile=$tmpPath/$name
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my $tmpFile = "$tmpDir/$name";
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# Optionally do timestamp-based caching of the download.
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# Actually, the only thing that we cache in $NIX_DOWNLOAD_CACHE is
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# the hash and the timestamp of the file at $url. The caching of
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# the file *contents* is done in Nix store, where it can be
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# garbage-collected independently.
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if test -n "$NIX_DOWNLOAD_CACHE"; then
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echo -n "$url" > $tmpPath/url
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urlHash=$($binDir/nix-hash --type sha256 --base32 --flat $tmpPath/url)
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echo "$url" > "$NIX_DOWNLOAD_CACHE/$urlHash.url"
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cachedHashFN="$NIX_DOWNLOAD_CACHE/$urlHash.$hashType"
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cachedTimestampFN="$NIX_DOWNLOAD_CACHE/$urlHash.stamp"
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cacheFlags="--remote-time"
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if test -e "$cachedTimestampFN" -a -e "$cachedHashFN"; then
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# Only download the file if it is newer than the cached version.
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cacheFlags="$cacheFlags --time-cond $cachedTimestampFN"
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fi
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fi
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my ($cachedTimestampFN, $cachedHashFN, @cacheFlags);
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if (defined $cacheDir) {
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my $urlHash = hashString("sha256", 1, $url);
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writeFile "$cacheDir/$urlHash.url", $url;
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$cachedHashFN = "$cacheDir/$urlHash.$hashType";
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$cachedTimestampFN = "$cacheDir/$urlHash.stamp";
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@cacheFlags = ("--time-cond", $cachedTimestampFN) if -f $cachedHashFN && -f $cachedTimestampFN;
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}
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# Perform the download.
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doDownload
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my @curlFlags = ("curl", $url, "-o", $tmpFile, "--fail", "--location", "--max-redirs", "20", "--disable-epsv", "--cookie-jar", "$tmpDir/cookies", "--remote-time", (split " ", ($ENV{NIX_CURL_FLAGS} || "")));
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(system $Nix::Config::curl @curlFlags, @cacheFlags) == 0 or die "$0: download of ‘$url’ failed\n";
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if test -n "$NIX_DOWNLOAD_CACHE" -a ! -e $tmpFile; then
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if (defined $cacheDir && ! -e $tmpFile) {
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# Curl didn't create $tmpFile, so apparently there's no newer
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# file on the server.
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hash=$(cat $cachedHashFN)
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finalPath=$($binDir/nix-store --print-fixed-path "$hashType" "$hash" "$name")
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if ! $binDir/nix-store --check-validity "$finalPath" 2> /dev/null; then
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echo "cached contents of \`$url' disappeared, redownloading..." >&2
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finalPath=
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cacheFlags="--remote-time"
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doDownload
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fi
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fi
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$hash = readFile $cachedHashFN or die;
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$finalPath = makeFixedOutputPath(0, $hashType, $hash, $name);
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unless (isValidPath $finalPath) {
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print STDERR "cached contents of ‘$url’ disappeared, redownloading...\n";
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$finalPath = undef;
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(system $Nix::Config::curl @curlFlags) == 0 or die "$0: download of ‘$url’ failed\n";
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}
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}
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if test -z "$finalPath"; then
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if (!defined $finalPath) {
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# Compute the hash.
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hash=$($binDir/nix-hash --type "$hashType" $hashFormat --flat $tmpFile)
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if ! test -n "$QUIET"; then echo "hash is $hash" >&2; fi
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$hash = hashFile($hashType, $hashType ne "md5", $tmpFile);
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if test -n "$NIX_DOWNLOAD_CACHE"; then
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echo $hash > $cachedHashFN
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touch -r $tmpFile $cachedTimestampFN
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fi
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if (defined $cacheDir) {
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writeFile $cachedHashFN, $hash;
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my $st = stat($tmpFile) or die;
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open STAMP, ">$cachedTimestampFN" or die; close STAMP;
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utime($st->atime, $st->mtime, $cachedTimestampFN) or die;
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}
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# Add the downloaded file to the Nix store.
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finalPath=$($binDir/nix-store --add-fixed "$hashType" $tmpFile)
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$finalPath = addToStore($tmpFile, 0, $hashType);
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}
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if test -n "$expHash" -a "$expHash" != "$hash"; then
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echo "hash mismatch for URL \`$url'" >&2
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exit 1
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fi
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die "$0: hash mismatch for ‘$url’\n" if defined $expHash && $expHash ne $hash;
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}
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fi
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fi
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if ! test -n "$QUIET"; then echo "path is $finalPath" >&2; fi
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echo $hash
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if test -n "$PRINT_PATH"; then
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echo $finalPath
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fi
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print STDERR "path is ‘$finalPath’\n" unless $ENV{'QUIET'};
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print "$hash\n";
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print "$finalPath\n" if $ENV{'PRINT_PATH'};
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