* Started integrating the new evaluation model into Nix.

* Cleaned up command-line syntax.
This commit is contained in:
Eelco Dolstra 2003-06-17 21:12:58 +00:00
parent 7a96da3627
commit 34fcf5fa0c
5 changed files with 143 additions and 679 deletions

View file

@ -10,5 +10,11 @@ AC_CANONICAL_HOST
AC_PROG_CC
AC_PROG_CXX
# Unix shell scripting should die a slow and painful death.
AC_DEFINE_UNQUOTED(NIX_VALUES_DIR, "$(eval echo $prefix/values)", Nix values directory.)
AC_DEFINE_UNQUOTED(NIX_STATE_DIR, "$(eval echo $localstatedir/nix)", Nix state directory.)
AC_DEFINE_UNQUOTED(NIX_LOG_DIR, "$(eval echo $localstatedir/log/nix)", Nix log file directory.)
AC_CONFIG_HEADER([config.h])
AC_CONFIG_FILES([Makefile src/Makefile scripts/Makefile])
AC_OUTPUT

View file

@ -1,9 +1,9 @@
bin_PROGRAMS = nix fix
bin_PROGRAMS = nix # fix
noinst_PROGRAMS = test
AM_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall
AM_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall -I..
nix_SOURCES = nix.cc db.cc util.cc hash.cc md5.c
nix_SOURCES = nix.cc util.cc hash.cc md5.c eval.cc values.cc globals.cc db.cc
nix_LDADD = -ldb_cxx-4 -lATerm
fix_SOURCES = fix.cc util.cc hash.cc md5.c
@ -20,4 +20,4 @@ install-data-local:
# $(INSTALL) -d $(localstatedir)/nix/prebuilts/exports
$(INSTALL) -d $(localstatedir)/log/nix
$(INSTALL) -d $(prefix)/values
$(bindir)/nix init
$(bindir)/nix --init

View file

@ -279,7 +279,7 @@ Expr evalValue(Expr e)
string fn = queryValuePath(evalHash(e2));
ATerm e3 = ATreadFromNamedFile(fn.c_str());
if (!e3) throw Error("reading aterm from " + fn);
return e3;
return evalValue(e3);
}
/* Execution primitive. */
@ -298,8 +298,8 @@ Expr evalValue(Expr e)
evalArgs(args, argsNF, env);
Hash sourceHash = hashExpr(
ATmake("Exec(Str(<str>), Hash(<str>), [])",
buildPlatform.c_str(), ((string) prog).c_str()));
ATmake("Exec(Str(<str>), Hash(<str>), <term>)",
buildPlatform.c_str(), ((string) prog).c_str(), argsNF));
/* Do we know a normal form for sourceHash? */
Hash targetHash;

View file

@ -1,715 +1,171 @@
#include <iostream>
#include <list>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <cstdio>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "config.h"
#include "util.hh"
#include "hash.hh"
#include "db.hh"
#include "nix.hh"
#include "globals.hh"
#include "values.hh"
#include "eval.hh"
using namespace std;
typedef void (* Operation) (Strings opFlags, Strings opArgs);
void readPkgDescr(Hash hash,
Params & pkgImports, Params & fileImports, Params & arguments)
/* Parse a supposed value argument. This can be a hash (the simple
case), a symbolic name (in which case we do a lookup to obtain the
hash), or a file name (which we import to obtain the hash). Note
that in order to disambiguate between symbolic names and file
names, a file name should contain at least one `/'. */
Hash parseValueArg(string s)
{
string pkgfile;
pkgfile = getFile(hash);
ATerm term = ATreadFromNamedFile(pkgfile.c_str());
if (!term) throw Error("cannot read aterm " + pkgfile);
ATerm bindings;
if (!ATmatch(term, "Descr(<term>)", &bindings))
throw Error("invalid term in " + pkgfile);
char * cname;
ATerm value;
while (ATmatch(bindings, "[Bind(<str>, <term>), <list>]",
&cname, &value, &bindings))
{
string name(cname);
char * arg;
if (ATmatch(value, "Pkg(<str>)", &arg)) {
parseHash(arg);
pkgImports[name] = arg;
} else if (ATmatch(value, "File(<str>)", &arg)) {
parseHash(arg);
fileImports[name] = arg;
} else if (ATmatch(value, "Str(<str>)", &arg))
arguments[name] = arg;
else if (ATmatch(value, "Bool(True)"))
arguments[name] = "1";
else if (ATmatch(value, "Bool(False)"))
arguments[name] = "";
else {
ATprintf("%t\n", value);
throw Error("invalid binding in " + pkgfile);
}
}
}
string getPkg(Hash hash);
void fetchDeps(Hash hash, Environment & env)
{
/* Read the package description file. */
Params pkgImports, fileImports, arguments;
readPkgDescr(hash, pkgImports, fileImports, arguments);
/* Recursively fetch all the dependencies, filling in the
environment as we go along. */
for (Params::iterator it = pkgImports.begin();
it != pkgImports.end(); it++)
{
cerr << "fetching package dependency "
<< it->first << " <- " << it->second
<< endl;
env[it->first] = getPkg(parseHash(it->second));
}
for (Params::iterator it = fileImports.begin();
it != fileImports.end(); it++)
{
cerr << "fetching file dependency "
<< it->first << " = " << it->second
<< endl;
string file;
file = getFile(parseHash(it->second));
env[it->first] = file;
}
string buildSystem;
for (Params::iterator it = arguments.begin();
it != arguments.end(); it++)
{
env[it->first] = it->second;
if (it->first == "system")
buildSystem = it->second;
}
if (buildSystem != thisSystem)
throw Error("descriptor requires a `" + buildSystem +
"' but I am a `" + thisSystem + "'");
}
string getFromEnv(const Environment & env, const string & key)
{
Environment::const_iterator it = env.find(key);
if (it == env.end())
throw Error("key " + key + " not found in the environment");
return it->second;
}
string queryPkgId(Hash hash)
{
Params pkgImports, fileImports, arguments;
readPkgDescr(hash, pkgImports, fileImports, arguments);
return getFromEnv(arguments, "id");
}
void installPkg(Hash hash)
{
string pkgfile;
string src;
string path;
string cmd;
string builder;
Environment env;
/* Fetch dependencies. */
fetchDeps(hash, env);
builder = getFromEnv(env, "build");
string id = getFromEnv(env, "id");
/* Construct a path for the installed package. */
path = nixHomeDir + "/pkg/" + id + "-" + (string) hash;
/* Create the path. */
if (mkdir(path.c_str(), 0777))
throw Error("unable to create directory " + path);
/* Create a log file. */
string logFileName =
nixLogDir + "/" + id + "-" + (string) hash + ".log";
/* !!! auto-pclose on exit */
FILE * logFile = popen(("tee " + logFileName + " >&2").c_str(), "w"); /* !!! escaping */
if (!logFile)
throw Error("unable to create log file " + logFileName);
try {
return parseHash(s);
} catch (BadRefError e) { };
/* Fork a child to build the package. */
pid_t pid;
switch (pid = fork()) {
case -1:
throw Error("unable to fork");
case 0:
try { /* child */
/* Go to the build directory. */
if (chdir(path.c_str())) {
cerr << "unable to chdir to package directory\n";
_exit(1);
}
/* Try to use a prebuilt. */
string prebuiltHashS, prebuiltFile;
if (queryDB(nixDB, dbPrebuilts, hash, prebuiltHashS)) {
try {
prebuiltFile = getFile(parseHash(prebuiltHashS));
} catch (Error e) {
cerr << "cannot obtain prebuilt (ignoring): " << e.what() << endl;
goto build;
}
cerr << "substituting prebuilt " << prebuiltFile << endl;
int res = system(("tar xfj " + prebuiltFile + " 1>&2").c_str()); // !!! escaping
if (WEXITSTATUS(res) != 0)
/* This is a fatal error, because path may now
have clobbered. */
throw Error("cannot unpack " + prebuiltFile);
_exit(0);
}
build:
/* Fill in the environment. We don't bother freeing
the strings, since we'll exec or die soon
anyway. */
const char * env2[env.size() + 1];
int i = 0;
for (Environment::iterator it = env.begin();
it != env.end(); it++, i++)
env2[i] = (new string(it->first + "=" + it->second))->c_str();
env2[i] = 0;
/* Dup the log handle into stderr. */
if (dup2(fileno(logFile), STDERR_FILENO) == -1)
throw Error("cannot pipe standard error into log file: " + string(strerror(errno)));
/* Dup stderr to stdin. */
if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1)
throw Error("cannot dup stderr into stdout");
/* Execute the builder. This should not return. */
execle(builder.c_str(), builder.c_str(), 0, env2);
throw Error("unable to execute builder: " +
string(strerror(errno)));
} catch (exception & e) {
cerr << "build error: " << e.what() << endl;
_exit(1);
}
}
/* parent */
/* Close the logging pipe. Note that this should not cause
the logger to exit until builder exits (because the latter
has an open file handle to the former). */
pclose(logFile);
/* Wait for the child to finish. */
int status;
if (waitpid(pid, &status, 0) != pid)
throw Error("unable to wait for child");
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
throw Error("unable to build package");
/* Remove write permission from the build directory. */
int res = system(("chmod -R -w " + path).c_str()); // !!! escaping
if (WEXITSTATUS(res) != 0)
throw Error("cannot remove write permission from " + path);
} catch (exception &) {
// system(("rm -rf " + path).c_str());
throw;
}
setDB(nixDB, dbInstPkgs, hash, path);
}
string getPkg(Hash hash)
{
string path;
while (!queryDB(nixDB, dbInstPkgs, hash, path))
installPkg(hash);
return path;
}
void runPkg(Hash hash,
Strings::iterator firstArg,
Strings::iterator lastArg)
{
string src;
string path;
string cmd;
string runner;
Environment env;
/* Fetch dependencies. */
fetchDeps(hash, env);
runner = getFromEnv(env, "run");
/* Fill in the environment. We don't bother freeing the
strings, since we'll exec or die soon anyway. */
for (Environment::iterator it = env.begin();
it != env.end(); it++)
{
string * s = new string(it->first + "=" + it->second);
putenv((char *) s->c_str());
}
/* Create the list of arguments. */
const char * args2[env.size() + 2];
int i = 0;
args2[i++] = runner.c_str();
for (Strings::const_iterator it = firstArg; it != lastArg; it++, i++)
args2[i] = it->c_str();
args2[i] = 0;
/* Execute the runner. This should not return. */
execv(runner.c_str(), (char * *) args2);
cerr << strerror(errno) << endl;
throw Error("unable to execute runner");
}
void ensurePkg(Hash hash)
{
Params pkgImports, fileImports, arguments;
readPkgDescr(hash, pkgImports, fileImports, arguments);
if (fileImports.find("build") != fileImports.end())
getPkg(hash);
else if (fileImports.find("run") != fileImports.end()) {
Environment env;
fetchDeps(hash, env);
} else throw Error("invalid descriptor");
}
void delPkg(Hash hash)
{
string path;
if (queryDB(nixDB, dbInstPkgs, hash, path)) {
int res = system(("chmod -R +w " + path + " && rm -rf " + path).c_str()); // !!! escaping
delDB(nixDB, dbInstPkgs, hash); // not a bug ???
if (WEXITSTATUS(res) != 0)
cerr << "errors deleting " + path + ", ignoring" << endl;
}
}
void exportPkgs(string outDir,
Strings::iterator firstHash,
Strings::iterator lastHash)
{
outDir = absPath(outDir);
for (Strings::iterator it = firstHash; it != lastHash; it++) {
Hash hash = parseHash(*it);
string pkgDir = getPkg(hash);
string tmpFile = outDir + "/export_tmp";
string cmd = "cd " + pkgDir + " && tar cfj " + tmpFile + " .";
int res = system(cmd.c_str()); // !!! escaping
if (!WIFEXITED(res) || WEXITSTATUS(res) != 0)
throw Error("cannot tar " + pkgDir);
string prebuiltHash = hashFile(tmpFile);
string pkgId = queryPkgId(hash);
string prebuiltFile = outDir + "/" +
pkgId + "-" + (string) hash + "-" + prebuiltHash + ".tar.bz2";
rename(tmpFile.c_str(), prebuiltFile.c_str());
}
}
void registerPrebuilt(Hash pkgHash, Hash prebuiltHash)
{
setDB(nixDB, dbPrebuilts, pkgHash, prebuiltHash);
}
Hash registerFile(string filename)
{
filename = absPath(filename);
Hash hash = hashFile(filename);
setDB(nixDB, dbRefs, hash, filename);
return hash;
}
void registerURL(Hash hash, string url)
{
setDB(nixDB, dbNetSources, hash, url);
/* !!! currently we allow only one network source per hash */
}
/* This is primarily used for bootstrapping. */
void registerInstalledPkg(Hash hash, string path)
{
if (path == "")
delDB(nixDB, dbInstPkgs, hash);
else
setDB(nixDB, dbInstPkgs, hash, path);
}
void verifyDB()
{
/* Check that all file references are still valid. */
DBPairs fileRefs;
enumDB(nixDB, dbRefs, fileRefs);
for (DBPairs::iterator it = fileRefs.begin();
it != fileRefs.end(); it++)
{
try {
Hash hash = parseHash(it->first);
if (hashFile(it->second) != hash) {
cerr << "file " << it->second << " has changed\n";
delDB(nixDB, dbRefs, it->first);
}
} catch (Error e) { /* !!! better error check */
cerr << "error: " << e.what() << endl;
delDB(nixDB, dbRefs, it->first);
}
}
/* Check that all installed packages are still there. */
DBPairs instPkgs;
enumDB(nixDB, dbInstPkgs, instPkgs);
for (DBPairs::iterator it = instPkgs.begin();
it != instPkgs.end(); it++)
{
struct stat st;
if (stat(it->second.c_str(), &st) == -1) {
cerr << "package " << it->first << " has disappeared\n";
delDB(nixDB, dbInstPkgs, it->first);
}
}
/* TODO: check that all directories in pkgHome are installed
packages. */
}
void listInstalledPkgs()
{
DBPairs instPkgs;
enumDB(nixDB, dbInstPkgs, instPkgs);
for (DBPairs::iterator it = instPkgs.begin();
it != instPkgs.end(); it++)
cout << it->first << endl;
}
void printInfo(Strings::iterator first, Strings::iterator last)
{
for (Strings::iterator it = first; it != last; it++) {
try {
cout << *it << " " << queryPkgId(parseHash(*it)) << endl;
} catch (Error & e) { // !!! more specific
cout << *it << " (descriptor missing)\n";
}
}
}
void computeClosure(Strings::iterator first, Strings::iterator last,
set<string> & result)
{
list<string> workList(first, last);
set<string> doneSet;
while (!workList.empty()) {
Hash hash = parseHash(workList.front());
workList.pop_front();
if (doneSet.find(hash) == doneSet.end()) {
doneSet.insert(hash);
Params pkgImports, fileImports, arguments;
readPkgDescr(hash, pkgImports, fileImports, arguments);
for (Params::iterator it = pkgImports.begin();
it != pkgImports.end(); it++)
workList.push_back(it->second);
}
}
result = doneSet;
}
void printClosure(Strings::iterator first, Strings::iterator last)
{
set<string> allHashes;
computeClosure(first, last, allHashes);
for (set<string>::iterator it = allHashes.begin();
it != allHashes.end(); it++)
cout << *it << endl;
}
string dotQuote(const string & s)
{
return "\"" + s + "\"";
}
void printGraph(Strings::iterator first, Strings::iterator last)
{
set<string> allHashes;
computeClosure(first, last, allHashes);
cout << "digraph G {\n";
for (set<string>::iterator it = allHashes.begin();
it != allHashes.end(); it++)
{
Params pkgImports, fileImports, arguments;
readPkgDescr(parseHash(*it), pkgImports, fileImports, arguments);
cout << dotQuote(*it) << "[label = \""
<< getFromEnv(arguments, "id")
<< "\"];\n";
for (Params::iterator it2 = pkgImports.begin();
it2 != pkgImports.end(); it2++)
cout << dotQuote(it2->second) << " -> "
<< dotQuote(*it) << ";\n";
}
cout << "}\n";
}
void fetch(string id)
{
string fn;
/* Fetch the object referenced by id. */
if (isHash(id)) {
throw Error("not implemented");
if (s.find('/') != string::npos) {
return addValue(s);
} else {
fn = fetchURL(id);
throw Error("not implemented");
}
/* Register it by hash. */
Hash hash = registerFile(fn);
cout << (string) hash << endl;
}
void fetch(Strings::iterator first, Strings::iterator last)
/* Evaluate values. */
static void opEvaluate(Strings opFlags, Strings opArgs)
{
for (Strings::iterator it = first; it != last; it++)
fetch(*it);
if (!opFlags.empty()) throw UsageError("unknown flag");
for (Strings::iterator it = opArgs.begin();
it != opArgs.end(); it++)
{
Hash hash = parseValueArg(*it);
Expr e = ATmake("Deref(Hash(<str>))", ((string) hash).c_str());
cerr << printExpr(evalValue(e)) << endl;
}
}
void printUsage()
static void opDelete(Strings opFlags, Strings opArgs)
{
cerr <<
"Usage: nix SUBCOMMAND OPTIONS...\n\
\n\
Subcommands:\n\
\n\
init\n\
Initialize the database.\n\
\n\
verify\n\
Remove stale entries from the database.\n\
\n\
regfile FILENAME...\n\
Register each FILENAME keyed by its hash.\n\
\n\
reginst HASH PATH\n\
Register an installed package.\n\
\n\
getpkg HASH...\n\
For each HASH, ensure that the package referenced by HASH is\n\
installed. Print out the path of the installation on stdout.\n\
\n\
delpkg HASH...\n\
Uninstall the package referenced by each HASH, disregarding any\n\
dependencies that other packages may have on HASH.\n\
\n\
listinst\n\
Prints a list of installed packages.\n\
\n\
run HASH ARGS...\n\
Run the descriptor referenced by HASH with the given arguments.\n\
\n\
ensure HASH...\n\
Like getpkg, but if HASH refers to a run descriptor, fetch only\n\
the dependencies.\n\
\n\
export DIR HASH...\n\
Export installed packages to DIR.\n\
\n\
regprebuilt HASH1 HASH2\n\
Inform Nix that an export HASH2 can be used to fast-build HASH1.\n\
\n\
info HASH...\n\
Print information about the specified descriptors.\n\
\n\
closure HASH...\n\
Determine the closure of the set of descriptors under the import\n\
relation, starting at the given roots.\n\
\n\
graph HASH...\n\
Like closure, but print a dot graph specification.\n\
\n\
fetch ID...\n\
Fetch the objects identified by ID and place them in the Nix\n\
sources directory. ID can be a hash or URL. Print out the hash\n\
of the object.\n\
";
cerr << "delete!\n";
}
/* Add values to the Nix values directory and print the hashes of
those values. */
static void opAdd(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
for (Strings::iterator it = opArgs.begin();
it != opArgs.end(); it++)
cout << (string) addValue(*it) << endl;
}
/* Initialise the Nix databases. */
static void opInit(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (!opArgs.empty())
throw UsageError("--init does not have arguments");
initDB();
}
/* Nix syntax:
nix [OPTIONS...] [ARGUMENTS...]
Operations:
--evaluate / -e: evaluate values
--delete / -d: delete values
--query / -q: query stored values
--add: add values
--verify: verify Nix structures
--dump: dump a value
--init: initialise the Nix database
--version: output version information
--help: display help
Operations that work on values accept the hash code of a value, the
symbolic name of a value, or a file name of a external value that
will be added prior to the operation.
Query suboptions:
Selection:
--all / -a: query all stored values, otherwise given values
Information:
--info / -i: general value information
Options:
--verbose / -v: verbose operation
*/
/* Initialize, process arguments, and dispatch to the right
operation. */
void run(Strings::iterator argCur, Strings::iterator argEnd)
{
umask(0022);
Strings opFlags, opArgs;
Operation op = 0;
char * homeDir = getenv(nixHomeDirEnvVar.c_str());
if (homeDir) nixHomeDir = homeDir;
/* Setup Nix paths. */
nixValues = NIX_VALUES_DIR;
nixLogDir = NIX_LOG_DIR;
nixDB = (string) NIX_STATE_DIR + "/nixstate.db";
nixSourcesDir = nixHomeDir + "/var/nix/sources";
nixLogDir = nixHomeDir + "/var/log/nix";
nixDB = nixHomeDir + "/var/nix/pkginfo.db";
/* Scan the arguments; find the operation, set global flags, put
all other flags in a list, and put all other arguments in
another list. */
/* Parse the global flags. */
for ( ; argCur != argEnd; argCur++) {
string arg(*argCur);
if (arg == "-h" || arg == "--help") {
printUsage();
return;
} else if (arg[0] == '-') {
throw UsageError("invalid option `" + arg + "'");
} else break;
while (argCur != argEnd) {
string arg = *argCur++;
Operation oldOp = op;
if (arg == "--evaluate" || arg == "-e")
op = opEvaluate;
else if (arg == "--delete" || arg == "-d")
op = opDelete;
else if (arg == "--add")
op = opAdd;
else if (arg == "--init")
op = opInit;
else if (arg[0] == '-')
opFlags.push_back(arg);
else
opArgs.push_back(arg);
if (oldOp && oldOp != op)
throw UsageError("only one operation may be specified");
}
UsageError argcError("wrong number of arguments");
if (!op) throw UsageError("no operation specified");
/* Parse the command. */
if (argCur == argEnd) throw UsageError("no command specified");
string cmd = *argCur++;
int argc = argEnd - argCur;
if (cmd == "init") {
if (argc != 0) throw argcError;
initDB();
} else if (cmd == "verify") {
if (argc != 0) throw argcError;
verifyDB();
} else if (cmd == "getpkg") {
for (Strings::iterator it = argCur; it != argEnd; it++) {
string path = getPkg(parseHash(*it));
cout << path << endl;
}
} else if (cmd == "delpkg") {
for (Strings::iterator it = argCur; it != argEnd; it++)
delPkg(parseHash(*it));
} else if (cmd == "run") {
if (argc < 1) throw argcError;
runPkg(parseHash(*argCur), argCur + 1, argEnd);
} else if (cmd == "ensure") {
for (Strings::iterator it = argCur; it != argEnd; it++)
ensurePkg(parseHash(*it));
} else if (cmd == "export") {
if (argc < 1) throw argcError;
exportPkgs(*argCur, argCur + 1, argEnd);
} else if (cmd == "regprebuilt") {
if (argc != 2) throw argcError;
registerPrebuilt(parseHash(argCur[0]), parseHash(argCur[1]));
} else if (cmd == "regfile") {
for_each(argCur, argEnd, registerFile);
} else if (cmd == "regurl") {
registerURL(parseHash(argCur[0]), argCur[1]);
} else if (cmd == "reginst") {
if (argc != 2) throw argcError;
registerInstalledPkg(parseHash(argCur[0]), argCur[1]);
} else if (cmd == "listinst") {
if (argc != 0) throw argcError;
listInstalledPkgs();
} else if (cmd == "info") {
printInfo(argCur, argEnd);
} else if (cmd == "closure") {
printClosure(argCur, argEnd);
} else if (cmd == "graph") {
printGraph(argCur, argEnd);
} else if (cmd == "fetch") {
fetch(argCur, argEnd);
} else
throw UsageError("unknown command: " + string(cmd));
op(opFlags, opArgs);
}
int main(int argc, char * * argv)
{
/* ATerm setup. */
ATerm bottomOfStack;
ATinit(argc, argv, &bottomOfStack);
/* Put the arguments in a vector. */
try {
Strings args;
while (argc--) args.push_back(*argv++);
Strings::iterator argCur = args.begin(), argEnd = args.end();
run(args.begin() + 1, args.end());
argCur++;
try {
run(argCur, argEnd);
} catch (UsageError & e) {
cerr << "error: " << e.what() << endl
<< "Try `nix -h' for more information.\n";
<< "Try `nix --help' for more information.\n";
return 1;
} catch (exception & e) {
cerr << "error: " << e.what() << endl;

View file

@ -19,6 +19,8 @@ static string absValuePath(string s)
Hash addValue(string path)
{
path = absPath(path);
Hash hash = hashPath(path);
string name;
@ -79,7 +81,7 @@ string queryValuePath(Hash hash)
return fn;
}
throw Error("a file with hash " + (string) hash + " is requested, "
throw Error("a file with hash " + (string) hash + " is required, "
"but it is not known to exist locally or on the network");
#if 0
if (checkedNet)
@ -87,7 +89,7 @@ string queryValuePath(Hash hash)
" should have hash " + (string) hash + ", but it doesn't");
if (!queryDB(nixDB, dbNetSources, hash, url))
throw Error("a file with hash " + (string) hash + " is requested, "
throw Error("a file with hash " + (string) hash + " is required, "
"but it is not known to exist locally or on the network");
checkedNet = true;