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Store build logs in /nix/var/log/nix/drvs/<XX>

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...where <XX> is the first two characters of the derivation.
Otherwise /nix/var/log/nix/drvs may become so large that we run into
all sorts of weird filesystem limits/inefficiences.  For instance,
ext3/ext4 filesystems will barf with "ext4_dx_add_entry:1551:
Directory index full!" once you hit a few million files.
This commit is contained in:
Eelco Dolstra 2013-01-17 15:37:52 +01:00
parent 66fa9e6a4d
commit 536c85ea49
2 changed files with 37 additions and 30 deletions
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8
src/libstore/build.cc
View file

@ -2343,13 +2343,15 @@ Path DerivationGoal::openLogFile()
{
if (!settings.keepLog) return "";
string baseName = baseNameOf(drvPath);
/* Create a log file. */
Path dir = (format("%1%/%2%") % settings.nixLogDir % drvsLogDir).str();
Path dir = (format("%1%/%2%/%3%/") % settings.nixLogDir % drvsLogDir % string(baseName, 0, 2)).str();
createDirs(dir);
if (settings.compressLog) {
Path logFileName = (format("%1%/%2%.bz2") % dir % baseNameOf(drvPath)).str();
Path logFileName = (format("%1%/%2%.bz2") % dir % string(baseName, 2)).str();
AutoCloseFD fd = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
if (fd == -1) throw SysError(format("creating log file `%1%'") % logFileName);
closeOnExec(fd);
@ -2364,7 +2366,7 @@ Path DerivationGoal::openLogFile()
return logFileName;
} else {
Path logFileName = (format("%1%/%2%") % dir % baseNameOf(drvPath)).str();
Path logFileName = (format("%1%/%2%") % dir % string(baseName, 2)).str();
fdLogFile = open(logFileName.c_str(), O_CREAT | O_WRONLY | O_TRUNC, 0666);
if (fdLogFile == -1) throw SysError(format("creating log file `%1%'") % logFileName);
closeOnExec(fdLogFile);

59
src/nix-store/nix-store.cc
View file

@ -460,35 +460,40 @@ static void opReadLog(Strings opFlags, Strings opArgs)
foreach (Strings::iterator, i, opArgs) {
Path path = useDeriver(followLinksToStorePath(*i));
Path logPath = (format("%1%/%2%/%3%") %
settings.nixLogDir % drvsLogDir % baseNameOf(path)).str();
Path logBz2Path = logPath + ".bz2";
for (int j = 0; j < 2; j++) {
if (j == 2) throw Error(format("build log of derivation `%1%' is not available") % path);
if (pathExists(logPath)) {
/* !!! Make this run in O(1) memory. */
string log = readFile(logPath);
writeFull(STDOUT_FILENO, (const unsigned char *) log.data(), log.size());
string baseName = baseNameOf(path);
Path logPath =
j == 0
? (format("%1%/%2%/%3%/%4%") % settings.nixLogDir % drvsLogDir % string(baseName, 0, 2) % string(baseName, 2)).str()
: (format("%1%/%2%/%3%") % settings.nixLogDir % drvsLogDir % baseName).str();
Path logBz2Path = logPath + ".bz2";
if (pathExists(logPath)) {
/* !!! Make this run in O(1) memory. */
string log = readFile(logPath);
writeFull(STDOUT_FILENO, (const unsigned char *) log.data(), log.size());
}
else if (pathExists(logBz2Path)) {
AutoCloseFD fd = open(logBz2Path.c_str(), O_RDONLY);
FILE * f = 0;
if (fd == -1 || (f = fdopen(fd.borrow(), "r")) == 0)
throw SysError(format("opening file `%1%'") % logBz2Path);
int err;
BZFILE * bz = BZ2_bzReadOpen(&err, f, 0, 0, 0, 0);
if (!bz) throw Error(format("cannot open bzip2 file `%1%'") % logBz2Path);
unsigned char buf[128 * 1024];
do {
int n = BZ2_bzRead(&err, bz, buf, sizeof(buf));
if (err != BZ_OK && err != BZ_STREAM_END)
throw Error(format("error reading bzip2 file `%1%'") % logBz2Path);
writeFull(STDOUT_FILENO, buf, n);
} while (err != BZ_STREAM_END);
BZ2_bzReadClose(&err, bz);
}
}
else if (pathExists(logBz2Path)) {
AutoCloseFD fd = open(logBz2Path.c_str(), O_RDONLY);
FILE * f = 0;
if (fd == -1 || (f = fdopen(fd.borrow(), "r")) == 0)
throw SysError(format("opening file `%1%'") % logBz2Path);
int err;
BZFILE * bz = BZ2_bzReadOpen(&err, f, 0, 0, 0, 0);
if (!bz) throw Error(format("cannot open bzip2 file `%1%'") % logBz2Path);
unsigned char buf[128 * 1024];
do {
int n = BZ2_bzRead(&err, bz, buf, sizeof(buf));
if (err != BZ_OK && err != BZ_STREAM_END)
throw Error(format("error reading bzip2 file `%1%'") % logBz2Path);
writeFull(STDOUT_FILENO, buf, n);
} while (err != BZ_STREAM_END);
BZ2_bzReadClose(&err, bz);
}
else throw Error(format("build log of derivation `%1%' is not available") % path);
}
}