nix-prefetch-url: Rewrite in C++
This commit is contained in:
Eelco Dolstra
parent
bdc4a0b54d
commit
bec3c31608
6 changed files with 141 additions and 133 deletions
1
Makefile
1
Makefile
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@ -13,6 +13,7 @@ makefiles = \
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src/nix-collect-garbage/local.mk \
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src/download-via-ssh/local.mk \
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src/nix-log2xml/local.mk \
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src/nix-prefetch-url/local.mk \
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src/bsdiff-4.3/local.mk \
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perl/local.mk \
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scripts/local.mk \
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@ -4,7 +4,6 @@ nix_bin_scripts := \
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$(d)/nix-copy-closure \
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$(d)/nix-generate-patches \
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$(d)/nix-install-package \
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$(d)/nix-prefetch-url \
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$(d)/nix-pull \
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$(d)/nix-push
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@ -1,132 +0,0 @@
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#! @perl@ -w @perlFlags@
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use utf8;
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use strict;
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use File::Basename;
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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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use Nix::Utils;
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binmode STDERR, ":encoding(utf8)";
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my $hashType = $ENV{'NIX_HASH_ALGO'} || "sha256"; # obsolete
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my $cacheDir = $ENV{'NIX_DOWNLOAD_CACHE'};
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my @args;
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my $arg;
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while ($arg = shift) {
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if ($arg eq "--help") {
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exec "man nix-prefetch-url" or die;
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} elsif ($arg eq "--type") {
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$hashType = shift;
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die "$0: ‘$arg’ requires an argument\n" unless defined $hashType;
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} elsif (substr($arg, 0, 1) eq "-") {
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die "$0: unknown flag ‘$arg’\n";
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} else {
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push @args, $arg;
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}
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}
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my $url = $args[0];
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my $expHash = $args[1];
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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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my $tmpDir = mkTempDir("nix-prefetch-url");
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# Hack to support the mirror:// scheme from Nixpkgs.
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if ($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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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 (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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# 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 (!defined $finalPath) {
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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 $url. The caching of
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# the file *contents* is done in Nix store, where it can be
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# garbage-collected independently.
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my ($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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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 (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 = 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 (!defined $finalPath) {
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# Compute the hash.
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$hash = hashFile($hashType, $hashType ne "md5", $tmpFile);
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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 = addToStore($tmpFile, 0, $hashType);
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}
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die "$0: hash mismatch for ‘$url’\n" if defined $expHash && $expHash ne $hash;
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}
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print STDERR "path is ‘$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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@ -202,6 +202,7 @@ public:
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AutoDelete(const Path & p, bool recursive = true);
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~AutoDelete();
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void cancel();
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operator Path() const { return path; }
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};
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7
src/nix-prefetch-url/local.mk
Normal file
7
src/nix-prefetch-url/local.mk
Normal file
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@ -0,0 +1,7 @@
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programs += nix-prefetch-url
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nix-prefetch-url_DIR := $(d)
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nix-prefetch-url_SOURCES := $(d)/nix-prefetch-url.cc
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nix-prefetch-url_LIBS = libmain libexpr libstore libutil libformat
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132
src/nix-prefetch-url/nix-prefetch-url.cc
Normal file
132
src/nix-prefetch-url/nix-prefetch-url.cc
Normal file
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@ -0,0 +1,132 @@
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#include "hash.hh"
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#include "shared.hh"
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#include "download.hh"
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#include "store-api.hh"
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#include "eval.hh"
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#include "eval-inline.hh"
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#include "common-opts.hh"
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#include <iostream>
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using namespace nix;
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/* If ‘uri’ starts with ‘mirror://’, then resolve it using the list of
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mirrors defined in Nixpkgs. */
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string resolveMirrorUri(EvalState & state, string uri)
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{
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if (string(uri, 0, 9) != "mirror://") return uri;
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string s(uri, 9);
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auto p = s.find('/');
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if (p == string::npos) throw Error("invalid mirror URI");
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string mirrorName(s, 0, p);
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Value vMirrors;
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state.eval(state.parseExprFromString("import <nixpkgs/pkgs/build-support/fetchurl/mirrors.nix>", "."), vMirrors);
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state.forceAttrs(vMirrors);
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auto mirrorList = vMirrors.attrs->find(state.symbols.create(mirrorName));
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if (mirrorList == vMirrors.attrs->end())
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throw Error(format("unknown mirror name ‘%1%’") % mirrorName);
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state.forceList(*mirrorList->value);
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if (mirrorList->value->listSize() < 1)
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throw Error(format("mirror URI ‘%1%’ did not expand to anything") % uri);
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string mirror = state.forceString(*mirrorList->value->listElems()[0]);
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return mirror + (hasSuffix(mirror, "/") ? "" : "/") + string(s, p + 1);
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}
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int main(int argc, char * * argv)
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{
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return handleExceptions(argv[0], [&]() {
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initNix();
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initGC();
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HashType ht = htSHA256;
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std::vector<string> args;
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Strings searchPath;
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parseCmdLine(argc, argv, [&](Strings::iterator & arg, const Strings::iterator & end) {
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if (*arg == "--help")
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showManPage("nix-prefetch-url");
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else if (*arg == "--version")
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printVersion("nix-prefetch-url");
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else if (*arg == "--type") {
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string s = getArg(*arg, arg, end);
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ht = parseHashType(s);
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if (ht == htUnknown)
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throw UsageError(format("unknown hash type ‘%1%’") % s);
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}
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else if (parseSearchPathArg(arg, end, searchPath))
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;
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else if (*arg != "" && arg->at(0) == '-')
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return false;
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else
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args.push_back(*arg);
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return true;
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});
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if (args.size() < 1 || args.size() > 2)
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throw UsageError("nix-prefetch-url expects one argument");
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store = openStore();
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EvalState state(searchPath);
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/* Figure out a name in the Nix store. */
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auto uri = args[0];
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auto name = baseNameOf(uri);
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if (name.empty())
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throw Error(format("cannot figure out file name for ‘%1%’") % uri);
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/* If an expected hash is given, the file may already exist in
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the store. */
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Hash hash, expectedHash(ht);
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Path storePath;
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if (args.size() == 2) {
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expectedHash = parseHash16or32(ht, args[1]);
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storePath = makeFixedOutputPath(false, ht, expectedHash, name);
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if (store->isValidPath(storePath))
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hash = expectedHash;
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else
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storePath.clear();
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}
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if (storePath.empty()) {
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auto actualUri = resolveMirrorUri(state, uri);
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if (uri != actualUri)
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printMsg(lvlInfo, format("‘%1%’ expands to ‘%2%’") % uri % actualUri);
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/* Download the file. */
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auto result = downloadFile(actualUri);
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/* Copy the file to the Nix store. FIXME: if RemoteStore
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implemented addToStoreFromDump() and downloadFile()
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supported a sink, we could stream the download directly
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into the Nix store. */
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AutoDelete tmpDir(createTempDir(), true);
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Path tmpFile = (Path) tmpDir + "/tmp";
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writeFile(tmpFile, result.data);
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/* FIXME: inefficient; addToStore() will also hash
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this. */
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hash = hashString(ht, result.data);
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if (expectedHash != Hash(ht) && expectedHash != hash)
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throw Error(format("hash mismatch for ‘%1%’") % uri);
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storePath = store->addToStore(name, tmpFile, false, ht);
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}
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printMsg(lvlInfo, format("path is ‘%1%’") % storePath);
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std::cout << printHash16or32(hash) << std::endl;
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if (getEnv("PRINT_PATH") != "")
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std::cout << storePath << std::endl;
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});
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}
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