From 0a2bee307b20411f5b0dda0c662b1f9bb9e0e131 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Mon, 20 Jul 2015 04:30:16 +0200 Subject: Make a builtin builder This ensures that 1) the derivation doesn't change when Nix changes; 2) the derivation closure doesn't contain Nix and its dependencies; 3) we don't have to rely on ugly chroot hacks. --- src/libexpr/download.cc | 236 ------------------------------------------------ src/libexpr/download.hh | 22 ----- src/libexpr/local.mk | 2 +- 3 files changed, 1 insertion(+), 259 deletions(-) delete mode 100644 src/libexpr/download.cc delete mode 100644 src/libexpr/download.hh (limited to 'src/libexpr') diff --git a/src/libexpr/download.cc b/src/libexpr/download.cc deleted file mode 100644 index 9bf3e13aa9da..000000000000 --- a/src/libexpr/download.cc +++ /dev/null @@ -1,236 +0,0 @@ -#include "download.hh" -#include "util.hh" -#include "globals.hh" -#include "hash.hh" -#include "store-api.hh" - -#include - -namespace nix { - -struct Curl -{ - CURL * curl; - string data; - string etag, status, expectedETag; - - struct curl_slist * requestHeaders; - - static size_t writeCallback(void * contents, size_t size, size_t nmemb, void * userp) - { - Curl & c(* (Curl *) userp); - size_t realSize = size * nmemb; - c.data.append((char *) contents, realSize); - return realSize; - } - - static size_t headerCallback(void * contents, size_t size, size_t nmemb, void * userp) - { - Curl & c(* (Curl *) userp); - size_t realSize = size * nmemb; - string line = string((char *) contents, realSize); - printMsg(lvlVomit, format("got header: %1%") % trim(line)); - if (line.compare(0, 5, "HTTP/") == 0) { // new response starts - c.etag = ""; - auto ss = tokenizeString>(line, " "); - c.status = ss.size() >= 2 ? ss[1] : ""; - } else { - auto i = line.find(':'); - if (i != string::npos) { - string name = trim(string(line, 0, i)); - if (name == "ETag") { // FIXME: case - c.etag = trim(string(line, i + 1)); - /* Hack to work around a GitHub bug: it sends - ETags, but ignores If-None-Match. So if we get - the expected ETag on a 200 response, then shut - down the connection because we already have the - data. */ - printMsg(lvlDebug, format("got ETag: %1%") % c.etag); - if (c.etag == c.expectedETag && c.status == "200") { - printMsg(lvlDebug, format("shutting down on 200 HTTP response with expected ETag")); - return 0; - } - } - } - } - return realSize; - } - - static int progressCallback(void * clientp, double dltotal, double dlnow, double ultotal, double ulnow) - { - return _isInterrupted; - } - - Curl() - { - requestHeaders = 0; - - curl = curl_easy_init(); - if (!curl) throw Error("unable to initialize curl"); - - curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); - curl_easy_setopt(curl, CURLOPT_CAINFO, getEnv("SSL_CERT_FILE", "/etc/ssl/certs/ca-certificates.crt").c_str()); - curl_easy_setopt(curl, CURLOPT_USERAGENT, ("Nix/" + nixVersion).c_str()); - curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1); - - curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeCallback); - curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *) &curl); - - curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, headerCallback); - curl_easy_setopt(curl, CURLOPT_HEADERDATA, (void *) &curl); - - curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progressCallback); - curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0); - } - - ~Curl() - { - if (curl) curl_easy_cleanup(curl); - if (requestHeaders) curl_slist_free_all(requestHeaders); - } - - bool fetch(const string & url, const string & expectedETag = "") - { - curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); - - data.clear(); - - if (requestHeaders) { - curl_slist_free_all(requestHeaders); - requestHeaders = 0; - } - - if (!expectedETag.empty()) { - this->expectedETag = expectedETag; - requestHeaders = curl_slist_append(requestHeaders, ("If-None-Match: " + expectedETag).c_str()); - } - - curl_easy_setopt(curl, CURLOPT_HTTPHEADER, requestHeaders); - - CURLcode res = curl_easy_perform(curl); - checkInterrupt(); - if (res == CURLE_WRITE_ERROR && etag == expectedETag) return false; - if (res != CURLE_OK) - throw DownloadError(format("unable to download ‘%1%’: %2% (%3%)") - % url % curl_easy_strerror(res) % res); - - long httpStatus = 0; - curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &httpStatus); - if (httpStatus == 304) return false; - - return true; - } -}; - - -DownloadResult downloadFile(string url, string expectedETag) -{ - DownloadResult res; - Curl curl; - if (curl.fetch(url, expectedETag)) { - res.cached = false; - res.data = curl.data; - } else - res.cached = true; - res.etag = curl.etag; - return res; -} - - -Path downloadFileCached(const string & url, bool unpack) -{ - Path cacheDir = getEnv("XDG_CACHE_HOME", getEnv("HOME", "") + "/.cache") + "/nix/tarballs"; - createDirs(cacheDir); - - string urlHash = printHash32(hashString(htSHA256, url)); - - Path dataFile = cacheDir + "/" + urlHash + ".info"; - Path fileLink = cacheDir + "/" + urlHash + "-file"; - - Path storePath; - - string expectedETag; - - int ttl = settings.get("tarball-ttl", 60 * 60); - bool skip = false; - - if (pathExists(fileLink) && pathExists(dataFile)) { - storePath = readLink(fileLink); - store->addTempRoot(storePath); - if (store->isValidPath(storePath)) { - auto ss = tokenizeString>(readFile(dataFile), "\n"); - if (ss.size() >= 3 && ss[0] == url) { - time_t lastChecked; - if (string2Int(ss[2], lastChecked) && lastChecked + ttl >= time(0)) - skip = true; - else if (!ss[1].empty()) { - printMsg(lvlDebug, format("verifying previous ETag ‘%1%’") % ss[1]); - expectedETag = ss[1]; - } - } - } else - storePath = ""; - } - - string name; - auto p = url.rfind('/'); - if (p != string::npos) name = string(url, p + 1); - - if (!skip) { - - if (storePath.empty()) - printMsg(lvlInfo, format("downloading ‘%1%’...") % url); - else - printMsg(lvlInfo, format("checking ‘%1%’...") % url); - - try { - auto res = downloadFile(url, expectedETag); - - if (!res.cached) - storePath = store->addTextToStore(name, res.data, PathSet(), false); - - assert(!storePath.empty()); - replaceSymlink(storePath, fileLink); - - writeFile(dataFile, url + "\n" + res.etag + "\n" + int2String(time(0)) + "\n"); - } catch (DownloadError & e) { - if (storePath.empty()) throw; - printMsg(lvlError, format("warning: %1%; using cached result") % e.msg()); - } - } - - if (unpack) { - Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked"; - Path unpackedStorePath; - if (pathExists(unpackedLink)) { - unpackedStorePath = readLink(unpackedLink); - store->addTempRoot(unpackedStorePath); - if (!store->isValidPath(unpackedStorePath)) - unpackedStorePath = ""; - } - if (unpackedStorePath.empty()) { - printMsg(lvlInfo, format("unpacking ‘%1%’...") % url); - Path tmpDir = createTempDir(); - AutoDelete autoDelete(tmpDir, true); - // FIXME: this requires GNU tar for decompression. - runProgram("tar", true, {"xf", storePath, "-C", tmpDir, "--strip-components", "1"}, ""); - unpackedStorePath = store->addToStore(name, tmpDir, true, htSHA256, defaultPathFilter, false); - } - replaceSymlink(unpackedStorePath, unpackedLink); - return unpackedStorePath; - } - - return storePath; -} - - -bool isUri(const string & s) -{ - size_t pos = s.find("://"); - if (pos == string::npos) return false; - string scheme(s, 0, pos); - return scheme == "http" || scheme == "https" || scheme == "file"; -} - - -} diff --git a/src/libexpr/download.hh b/src/libexpr/download.hh deleted file mode 100644 index 28c9117e4227..000000000000 --- a/src/libexpr/download.hh +++ /dev/null @@ -1,22 +0,0 @@ -#pragma once - -#include "types.hh" -#include - -namespace nix { - -struct DownloadResult -{ - bool cached; - string data, etag; -}; - -DownloadResult downloadFile(string url, string expectedETag = ""); - -Path downloadFileCached(const string & url, bool unpack); - -MakeError(DownloadError, Error) - -bool isUri(const string & s); - -} diff --git a/src/libexpr/local.mk b/src/libexpr/local.mk index 35e84980a6dd..4c1f4de19187 100644 --- a/src/libexpr/local.mk +++ b/src/libexpr/local.mk @@ -8,7 +8,7 @@ libexpr_SOURCES := $(wildcard $(d)/*.cc) $(d)/lexer-tab.cc $(d)/parser-tab.cc libexpr_LIBS = libutil libstore libformat -libexpr_LDFLAGS = -ldl -lcurl +libexpr_LDFLAGS = -ldl # The dependency on libgc must be propagated (i.e. meaning that # programs/libraries that use libexpr must explicitly pass -lgc), -- cgit 1.4.1