mirror of
https://github.com/NixOS/nix
synced 2025-06-27 04:21:16 +02:00
Make <nix/fetchurl.nix> 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.
This commit is contained in:
Eelco Dolstra
parent
eda2f36c2a
commit
0a2bee307b
9 changed files with 61 additions and 20 deletions
|
|
@ -1,236 +0,0 @@
|
|||
#include "download.hh"
|
||||
#include "util.hh"
|
||||
#include "globals.hh"
|
||||
#include "hash.hh"
|
||||
#include "store-api.hh"
|
||||
|
||||
#include <curl/curl.h>
|
||||
|
||||
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<vector<string>>(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<vector<string>>(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";
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
|
|
@ -1,22 +0,0 @@
|
|||
#pragma once
|
||||
|
||||
#include "types.hh"
|
||||
#include <string>
|
||||
|
||||
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);
|
||||
|
||||
}
|
||||
|
|
@ -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),
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue