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Use cached result if there is a network error

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This commit is contained in:
Eelco Dolstra 2015-04-09 12:49:13 +02:00
parent 1fc905ad4c
commit 4ed2187377
3 changed files with 15 additions and 8 deletions
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2
src/libexpr/download.cc
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@ -100,7 +100,7 @@ struct Curl
CURLcode res = curl_easy_perform(curl); CURLcode res = curl_easy_perform(curl);
if (res == CURLE_WRITE_ERROR && etag == expectedETag) return false; if (res == CURLE_WRITE_ERROR && etag == expectedETag) return false;
if (res != CURLE_OK) if (res != CURLE_OK)
throw Error(format("unable to download ‘%1%’: %2% (%3%)") throw DownloadError(format("unable to download ‘%1%’: %2% (%3%)")
% url % curl_easy_strerror(res) % res); % url % curl_easy_strerror(res) % res);
long httpStatus = 0; long httpStatus = 0;

2
src/libexpr/download.hh
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@ -13,4 +13,6 @@ struct DownloadResult
DownloadResult downloadFile(string url, string expectedETag = ""); DownloadResult downloadFile(string url, string expectedETag = "");
MakeError(DownloadError, Error)
} }

19
src/libexpr/primops.cc
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@ -1551,20 +1551,25 @@ void fetch(EvalState & state, const Pos & pos, Value * * args, Value & v,
if (!skip) { if (!skip) {
if (expectedETag.empty()) if (storePath.empty())
printMsg(lvlInfo, format("downloading ‘%1%’...") % url); printMsg(lvlInfo, format("downloading ‘%1%’...") % url);
else else
printMsg(lvlInfo, format("checking ‘%1%’...") % url); printMsg(lvlInfo, format("checking ‘%1%’...") % url);
auto res = downloadFile(url, expectedETag); try {
auto res = downloadFile(url, expectedETag);
if (!res.cached) if (!res.cached)
storePath = store->addTextToStore(name, res.data, PathSet(), state.repair); storePath = store->addTextToStore(name, res.data, PathSet(), state.repair);
assert(!storePath.empty()); assert(!storePath.empty());
replaceSymlink(storePath, fileLink); replaceSymlink(storePath, fileLink);
writeFile(dataFile, url + "\n" + res.etag + "\n" + int2String(time(0)) + "\n"); 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) { if (unpack) {