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Store: Add a method for getting build logs

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This allows various Store implementations to provide different ways to
get build logs. For example, BinaryCacheStore can get the build logs
from the binary cache.

Also, remove the log-servers option since we can use substituters for
this.
This commit is contained in:
Eelco Dolstra 2017-03-13 12:07:50 +01:00
parent 96443e94a1
commit 0afeb7f51e
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GPG key ID: 8170B4726D7198DE
9 changed files with 50 additions and 83 deletions
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57
src/nix-store/nix-store.cc
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@ -9,7 +9,6 @@
#include "util.hh"
#include "worker-protocol.hh"
#include "xmlgraph.hh"
#include "compression.hh"
#include <iostream>
#include <algorithm>
@ -482,58 +481,12 @@ static void opReadLog(Strings opFlags, Strings opArgs)
RunPager pager;
// FIXME: move getting logs into Store.
auto store2 = std::dynamic_pointer_cast<LocalFSStore>(store);
if (!store2) throw Error(format("store ‘%s’ does not support reading logs") % store->getUri());
for (auto & i : opArgs) {
Path path = useDeriver(store->followLinksToStorePath(i));
string baseName = baseNameOf(path);
bool found = false;
for (int j = 0; j < 2; j++) {
Path logPath =
j == 0
? (format("%1%/%2%/%3%/%4%") % store2->logDir % drvsLogDir % string(baseName, 0, 2) % string(baseName, 2)).str()
: (format("%1%/%2%/%3%") % store2->logDir % drvsLogDir % baseName).str();
Path logBz2Path = logPath + ".bz2";
if (pathExists(logPath)) {
/* !!! Make this run in O(1) memory. */
string log = readFile(logPath);
writeFull(STDOUT_FILENO, log);
found = true;
break;
}
else if (pathExists(logBz2Path)) {
std::cout << *decompress("bzip2", readFile(logBz2Path));
found = true;
break;
}
}
if (!found) {
for (auto & i : settings.logServers) {
string prefix = i;
if (!prefix.empty() && prefix.back() != '/') prefix += '/';
string url = prefix + baseName;
try {
string log = runProgram(CURL, true, {"--fail", "--location", "--silent", "--", url});
std::cout << "(using build log from " << url << ")" << std::endl;
std::cout << log;
found = true;
break;
} catch (ExecError & e) {
/* Ignore errors from curl. FIXME: actually, might be
nice to print a warning on HTTP status != 404. */
}
}
}
if (!found) throw Error(format("build log of derivation ‘%1%’ is not available") % path);
auto path = store->followLinksToStorePath(i);
auto log = store->getBuildLog(path);
if (!log)
throw Error("build log of derivation ‘%s’ is not available", path);
std::cout << *log;
}
}