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nix-store -l: Fetch build logs from the Internet

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If a build log is not available locally, then ‘nix-store -l’ will now
try to download it from the servers listed in the ‘log-servers’ option
in nix.conf. For instance, if you have:

  log-servers = http://hydra.nixos.org/log

then it will try to get logs from http://hydra.nixos.org/log/<base
name of the store path>. So you can do things like:

  $ nix-store -l $(which xterm)

and get a log even if xterm wasn't built locally.
This commit is contained in:
Eelco Dolstra 2014-05-21 17:19:36 +02:00
parent eac5841970
commit 9f9080e2c0
9 changed files with 144 additions and 93 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/nix-store/local.mk
View file

@ -7,3 +7,5 @@ nix-store_SOURCES := $(wildcard $(d)/*.cc)
nix-store_LIBS = libmain libstore libutil libformat
nix-store_LDFLAGS = -lbz2
nix-store_CXXFLAGS = -DCURL=\"$(curl)\"

29
src/nix-store/nix-store.cc
View file

@ -467,10 +467,11 @@ static void opReadLog(Strings opFlags, Strings opArgs)
foreach (Strings::iterator, i, opArgs) {
Path path = useDeriver(followLinksToStorePath(*i));
for (int j = 0; j <= 2; j++) {
if (j == 2) throw Error(format("build log of derivation `%1%' is not available") % path);
string baseName = baseNameOf(path);
bool found = false;
for (int j = 0; j < 2; j++) {
string baseName = baseNameOf(path);
Path logPath =
j == 0
? (format("%1%/%2%/%3%/%4%") % settings.nixLogDir % drvsLogDir % string(baseName, 0, 2) % string(baseName, 2)).str()
@ -481,6 +482,7 @@ static void opReadLog(Strings opFlags, Strings opArgs)
/* !!! Make this run in O(1) memory. */
string log = readFile(logPath);
writeFull(STDOUT_FILENO, (const unsigned char *) log.data(), log.size());
found = true;
break;
}
@ -500,9 +502,30 @@ static void opReadLog(Strings opFlags, Strings opArgs)
writeFull(STDOUT_FILENO, buf, n);
} while (err != BZ_STREAM_END);
BZ2_bzReadClose(&err, bz);
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);
}
}