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fetchTarball: Prevent concurrent downloads of the same file

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Fixes #849.
This commit is contained in:
Eelco Dolstra 2017-07-11 23:11:35 +02:00
parent 9c00fa4179
commit 8e8caf7f3e
1 changed files with 4 additions and 0 deletions
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4
src/libstore/download.cc
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@ -6,6 +6,7 @@
#include "archive.hh"
#include "s3.hh"
#include "compression.hh"
#include "pathlocks.hh"
#ifdef ENABLE_S3
#include <aws/core/client/ClientConfiguration.h>
@ -586,6 +587,8 @@ Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpa
Path dataFile = cacheDir + "/" + urlHash + ".info";
Path fileLink = cacheDir + "/" + urlHash + "-file";
PathLocks lock({fileLink}, fmt("waiting for lock on ‘%1%’...", fileLink));
Path storePath;
string expectedETag;
@ -647,6 +650,7 @@ Path Downloader::downloadCached(ref<Store> store, const string & url_, bool unpa
if (unpack) {
Path unpackedLink = cacheDir + "/" + baseNameOf(storePath) + "-unpacked";
PathLocks lock2({unpackedLink}, fmt("waiting for lock on ‘%1%’...", unpackedLink));
Path unpackedStorePath;
if (pathExists(unpackedLink)) {
unpackedStorePath = readLink(unpackedLink);