* `Fix' is a high-level descriptor instantiator for Nix. It replaces

nix-instantiate.
This commit is contained in:
Eelco Dolstra 2003-04-08 12:00:51 +00:00
parent 814b256da4
commit 0d2b24cdd1
8 changed files with 405 additions and 217 deletions

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@ -11,5 +11,4 @@ AC_PROG_CC
AC_PROG_CXX
AC_CONFIG_FILES([Makefile src/Makefile])
AC_CONFIG_FILES([src/nix-instantiate], [chmod +x src/nix-instantiate])
AC_OUTPUT

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@ -1,9 +1,13 @@
bin_PROGRAMS = nix
bin_PROGRAMS = nix fix
nix_SOURCES = nix.cc md5.c
nix_CXXFLAGS = -DSYSTEM=\"@host@\"
nix_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall
nix_LDADD = -ldb_cxx-4 -lATerm
fix_SOURCES = fix.cc md5.c
fix_CXXFLAGS = -DSYSTEM=\"@host@\" -Wall
fix_LDADD = -lATerm
install-data-local:
$(INSTALL) -d $(localstatedir)/nix
$(INSTALL) -d $(localstatedir)/nix/descriptors

295
src/fix.cc Normal file
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@ -0,0 +1,295 @@
#include <iostream>
#include <map>
extern "C" {
#include <aterm2.h>
}
#include "util.hh"
static string nixDescriptorDir;
static string nixSourcesDir;
typedef map<string, string> DescriptorMap;
void registerFile(string filename)
{
int res = system(("nix regfile " + filename).c_str());
if (WEXITSTATUS(res) != 0)
throw Error("cannot register " + filename + " with Nix");
}
/* Download object referenced by the given URL into the sources
directory. Return the file name it was downloaded to. */
string fetchURL(string url)
{
unsigned int pos = url.rfind('/');
if (pos == string::npos) throw Error("invalid url");
string filename(url, pos + 1);
string fullname = nixSourcesDir + "/" + filename;
/* !!! quoting */
string shellCmd =
"cd " + nixSourcesDir + " && wget --quiet -N \"" + url + "\"";
int res = system(shellCmd.c_str());
if (WEXITSTATUS(res) != 0)
throw Error("cannot fetch " + url);
return fullname;
}
/* Return the directory part of the given path, i.e., everything
before the final `/'. */
string dirOf(string s)
{
unsigned int pos = s.rfind('/');
if (pos == string::npos) throw Error("invalid file name");
return string(s, 0, pos);
}
/* Term evaluation functions. */
string evaluateStr(ATerm e)
{
char * s;
if (ATmatch(e, "<str>", &s))
return s;
else throw Error("invalid string expression");
}
ATerm evaluateBool(ATerm e)
{
if (ATmatch(e, "True") || ATmatch(e, "False"))
return e;
else throw Error("invalid boolean expression");
}
string evaluateFile(ATerm e, string dir)
{
char * s;
ATerm t;
if (ATmatch(e, "<str>", &s)) {
checkHash(s);
return s;
} else if (ATmatch(e, "Url(<term>)", &t)) {
string url = evaluateStr(t);
string filename = fetchURL(url);
registerFile(filename);
return hashFile(filename);
} else if (ATmatch(e, "Local(<term>)", &t)) {
string filename = absPath(evaluateStr(t), dir); /* !!! */
string cmd = "cp -p " + filename + " " + nixSourcesDir;
int res = system(cmd.c_str());
if (WEXITSTATUS(res) != 0)
throw Error("cannot copy " + filename);
return hashFile(filename);
} else throw Error("invalid hash expression");
}
ATerm evaluatePkg(ATerm e, DescriptorMap & done)
{
char * s;
if (ATmatch(e, "<str>", &s)) {
checkHash(s);
return s;
} else throw Error("invalid hash expression");
}
ATerm evaluate(ATerm e, string dir, DescriptorMap & done)
{
ATerm t;
if (ATmatch(e, "Str(<term>)", &t))
return ATmake("Str(<str>)", evaluateStr(t).c_str());
else if (ATmatch(e, "Bool(<term>)", &t))
return ATmake("Bool(<term>)", evaluateBool(t));
else if (ATmatch(e, "File(<term>)", &t))
return ATmake("File(<str>)", evaluateFile(t, dir).c_str());
else if (ATmatch(e, "Pkg(<term>)", &t))
return ATmake("Pkg(<term>)", evaluatePkg(t, done));
else throw Error("invalid expression type");
}
typedef map<string, ATerm> BindingsMap;
string getStringFromMap(BindingsMap & bindingsMap,
const string & name)
{
ATerm e = bindingsMap[name];
if (!e) throw Error("binding " + name + " is not set");
char * s;
if (ATmatch(e, "Str(<str>)", &s))
return s;
else
throw Error("binding " + name + " is not a string");
}
/* Instantiate a Fix descriptors into a Nix descriptor, recursively
instantiating referenced descriptors as well. */
string instantiateDescriptor(string filename,
DescriptorMap & done)
{
/* Already done? */
DescriptorMap::iterator isInMap = done.find(filename);
if (isInMap != done.end()) return isInMap->second;
/* No. */
string dir = dirOf(filename);
/* Read the Fix descriptor as an ATerm. */
ATerm inTerm = ATreadFromNamedFile(filename.c_str());
if (!inTerm) throw Error("cannot read aterm " + filename);
ATerm bindings;
if (!ATmatch(inTerm, "Descr(<term>)", &bindings))
throw Error("invalid term in " + filename);
/* Iterate over the bindings and evaluate them to normal form. */
BindingsMap bindingsMap; /* the normal forms */
char * cname;
ATerm value;
while (ATmatch(bindings, "[Bind(<str>, <term>), <list>]",
&cname, &value, &bindings))
{
string name(cname);
ATerm e = evaluate(value, dir, done);
bindingsMap[name] = e;
}
/* Construct a descriptor identifier by concatenating the package
and release ids. */
string pkgId = getStringFromMap(bindingsMap, "pkgId");
string releaseId = getStringFromMap(bindingsMap, "releaseId");
string id = pkgId + "-" + releaseId;
bindingsMap["id"] = ATmake("Str(<str>)", id.c_str());
/* Add a system name. */
bindingsMap["system"] = ATmake("Str(<str>)", thisSystem.c_str());
/* Construct the resulting ATerm. Note that iterating over the
map yields the bindings in sorted order, which is exactly the
canonical form for Nix descriptors. */
ATermList bindingsList = ATempty;
for (BindingsMap::iterator it = bindingsMap.begin();
it != bindingsMap.end(); it++)
/* !!! O(n^2) */
bindingsList = ATappend(bindingsList,
ATmake("Bind(<str>, <term>)", it->first.c_str(), it->second));
ATerm outTerm = ATmake("Descr(<term>)", bindingsList);
/* Write out the resulting ATerm. */
string tmpFilename = nixDescriptorDir + "/tmp";
if (!ATwriteToNamedTextFile(outTerm, tmpFilename.c_str()))
throw Error("cannot write aterm to " + tmpFilename);
string outHash = hashFile(tmpFilename);
string outFilename = nixDescriptorDir + "/" + id + "-" + outHash + ".nix";
if (rename(tmpFilename.c_str(), outFilename.c_str()))
throw Error("cannot rename " + tmpFilename + " to " + outFilename);
cout << outFilename << endl;
/* Register it with Nix. */
registerFile(outFilename);
done[filename] = outFilename;
return outFilename;
}
/* Instantiate a set of Fix descriptors into Nix descriptors. */
void instantiateDescriptors(Strings filenames)
{
DescriptorMap done;
for (Strings::iterator it = filenames.begin();
it != filenames.end(); it++)
{
string filename = absPath(*it);
instantiateDescriptor(filename, done);
}
}
/* Print help. */
void printUsage()
{
cerr <<
"Usage: fix ...
";
}
/* Parse the command-line arguments, call the right operation. */
void run(Strings::iterator argCur, Strings::iterator argEnd)
{
Strings extraArgs;
enum { cmdUnknown, cmdInstantiate } command = cmdUnknown;
char * homeDir = getenv(nixHomeDirEnvVar.c_str());
if (homeDir) nixHomeDir = homeDir;
nixDescriptorDir = nixHomeDir + "/var/nix/descriptors";
nixSourcesDir = nixHomeDir + "/var/nix/sources";
for ( ; argCur != argEnd; argCur++) {
string arg(*argCur);
if (arg == "-h" || arg == "--help") {
printUsage();
return;
} if (arg == "--instantiate" || arg == "-i") {
command = cmdInstantiate;
} else if (arg[0] == '-')
throw UsageError("invalid option `" + arg + "'");
else
extraArgs.push_back(arg);
}
switch (command) {
case cmdInstantiate:
instantiateDescriptors(extraArgs);
break;
default:
throw UsageError("no operation specified");
}
}
int main(int argc, char * * argv)
{
ATerm bottomOfStack;
ATinit(argc, argv, &bottomOfStack);
/* Put the arguments in a vector. */
Strings args;
while (argc--) args.push_back(*argv++);
Strings::iterator argCur = args.begin(), argEnd = args.end();
argCur++;
try {
run(argCur, argEnd);
} catch (UsageError & e) {
cerr << "error: " << e.what() << endl
<< "Try `fix -h' for more information.\n";
return 1;
} catch (exception & e) {
cerr << "error: " << e.what() << endl;
return 1;
}
return 0;
}

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@ -1,121 +0,0 @@
#! /usr/bin/perl -w
use strict;
use FileHandle;
use File::Spec;
use Digest::MD5;
my $system = "@host@";
my $outdir = File::Spec->rel2abs($ARGV[0]);
my $netdir = File::Spec->rel2abs($ARGV[1]);
my %donetmpls = ();
sub fetchFile {
my $loc = shift;
if ($loc =~ /^([+\w\d\.\/-]+)$/) {
return $1;
} elsif ($loc =~ /^url\((.*)\)$/) {
my $url = $1;
$url =~ /\/([^\/]+)$/ || die "invalid url $url";
my $fn = "$netdir/$1";
if (! -f $fn) {
print "fetching $url...\n";
system "cd $netdir; wget --quiet -N $url";
if ($? != 0) {
unlink($fn);
die;
}
}
return $fn;
} else {
die "invalid file specified $loc";
}
}
sub hashFile {
my $file = shift;
open FILE, "< $file" or die "cannot open $file";
# !!! error checking
my $hash = Digest::MD5->new->addfile(*FILE)->hexdigest;
close FILE;
return $hash;
}
sub convert {
my $descr = shift;
if (defined $donetmpls{$descr}) {
return $donetmpls{$descr};
}
my ($x, $dir, $fn) = File::Spec->splitpath($descr);
print "$descr\n";
my $IN = new FileHandle;
my $OUT = new FileHandle;
my $tmpfile = "$outdir/$fn-tmp";
open $IN, "< $descr" or die "cannot open $descr";
# Descr([Bind("x", Str("y")), Bind("x", File("1234")), Bind("x", Pkg("1234"))])
# bindings alphabetisch gesorteerd
my %bindings;
while (<$IN>) {
chomp;
s/\s*#.*$//;
next if (/^$/);
if (/^(\w+)\s*=\s*([^\#\s]*)\s*(\#.*)?$/) {
my ($name, $loc) = ($1, $2);
my $file = fetchFile($loc);
$file = File::Spec->rel2abs($file, $dir);
my $hash = hashFile($file);
$bindings{$name} = "File(\"$hash\")";
} elsif (/^(\w+)\s*<-\s*([+\w\d\.\/-]+)\s*(\#.*)?$/) {
my $name = $1;
my $file = $2;
$file = File::Spec->rel2abs($file, $dir);
$file = convert($file);
my $hash = hashFile($file);
$bindings{$name} = "Pkg(\"$hash\")";
} elsif (/^(\w+)\s*:\s*([+\w\d\.\/-]+)\s*(\#.*)?$/) {
my $name = $1;
my $value = $2;
$bindings{$name} = "Str(\"$value\")";
} else {
die "syntax error: $_";
}
}
close $IN;
$bindings{"system"} = "Str(\"$system\")";
open $OUT, "| baffle -wt > $tmpfile" or die "cannot create $tmpfile";
print $OUT "Descr([";
my $first = 1;
foreach my $name (sort (keys %bindings)) {
if (!$first) { print $OUT ","; };
print $OUT "Bind(\"$name\",$bindings{$name})";
$first = 0;
}
print $OUT "])";
close $OUT;
my $hash = hashFile($tmpfile);
my $outfile = "$outdir/$fn-$hash";
rename($tmpfile, $outfile) or die "cannot rename $tmpfile to $outfile";
$donetmpls{$descr} = $outfile;
return $outfile;
}
for (my $i = 2; $i < scalar @ARGV; $i++) {
convert(File::Spec->rel2abs($ARGV[$i]));
}

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@ -1,15 +1,11 @@
#include <iostream>
#include <fstream>
#include <memory>
#include <string>
#include <sstream>
#include <list>
#include <vector>
#include <set>
#include <map>
#include <cstdio>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
@ -20,10 +16,6 @@ extern "C" {
#include <aterm1.h>
}
extern "C" {
#include "md5.h"
}
#include "util.hh"
using namespace std;
@ -35,16 +27,6 @@ static string dbInstPkgs = "pkginst";
static string dbPrebuilts = "prebuilts";
/* The canonical system name, as returned by config.guess. */
static string thisSystem = SYSTEM;
/* The prefix of the Nix installation, and the environment variable
that can be used to override the default. */
static string nixHomeDir = "/nix";
static string nixHomeDirEnvVar = "NIX";
/* Wrapper classes that ensures that the database is closed upon
object destruction. */
class Db2 : public Db
@ -132,47 +114,6 @@ void enumDB(const string & dbname, DBPairs & contents)
}
string printHash(unsigned char * buf)
{
ostringstream str;
for (int i = 0; i < 16; i++) {
str.fill('0');
str.width(2);
str << hex << (int) buf[i];
}
return str.str();
}
/* Verify that a reference is valid (that is, is a MD5 hash code). */
void checkHash(const string & s)
{
string err = "invalid reference: " + s;
if (s.length() != 32)
throw BadRefError(err);
for (int i = 0; i < 32; i++) {
char c = s[i];
if (!((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f')))
throw BadRefError(err);
}
}
/* Compute the MD5 hash of a file. */
string hashFile(string filename)
{
unsigned char hash[16];
FILE * file = fopen(filename.c_str(), "rb");
if (!file)
throw BadRefError("file `" + filename + "' does not exist");
int err = md5_stream(file, hash);
fclose(file);
if (err) throw BadRefError("cannot hash file");
return printHash(hash);
}
typedef map<string, string> Params;
@ -212,7 +153,14 @@ void readPkgDescr(const string & hash,
fileImports[name] = arg;
} else if (ATmatch(value, "Str(<str>)", &arg))
arguments[name] = arg;
else throw Error("invalid binding in " + pkgfile);
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);
}
}
}
@ -473,12 +421,15 @@ void exportPkgs(string outDir,
Strings::iterator firstHash,
Strings::iterator lastHash)
{
outDir = absPath(outDir);
for (Strings::iterator it = firstHash; it != lastHash; it++) {
string hash = *it;
string pkgDir = getPkg(hash);
string tmpFile = outDir + "/export_tmp";
int res = system(("cd " + pkgDir + " && tar cvfj " + tmpFile + " .").c_str()); // !!! escaping
string cmd = "cd " + pkgDir + " && tar cvfj " + tmpFile + " .";
int res = system(cmd.c_str()); // !!! escaping
if (WEXITSTATUS(res) != 0)
throw Error("cannot tar " + pkgDir);
@ -500,19 +451,6 @@ void regPrebuilt(string pkgHash, string prebuiltHash)
}
string absPath(string filename)
{
if (filename[0] != '/') {
char buf[PATH_MAX];
if (!getcwd(buf, sizeof(buf)))
throw Error("cannot get cwd");
filename = string(buf) + "/" + filename;
/* !!! canonicalise */
}
return filename;
}
void registerFile(string filename)
{
filename = absPath(filename);

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@ -1,7 +1,15 @@
#ifndef __UTIL_H
#define __UTIL_H
#include <string>
#include <vector>
#include <sstream>
#include <unistd.h>
extern "C" {
#include "md5.h"
}
using namespace std;
@ -31,4 +39,78 @@ public:
typedef vector<string> Strings;
/* !!! the following shouldn't be here; abuse of the preprocessor */
/* The canonical system name, as returned by config.guess. */
static string thisSystem = SYSTEM;
/* The prefix of the Nix installation, and the environment variable
that can be used to override the default. */
static string nixHomeDir = "/nix";
static string nixHomeDirEnvVar = "NIX";
string absPath(string filename, string dir = "")
{
if (filename[0] != '/') {
if (dir == "") {
char buf[PATH_MAX];
if (!getcwd(buf, sizeof(buf)))
throw Error("cannot get cwd");
dir = buf;
}
filename = dir + "/" + filename;
/* !!! canonicalise */
char resolved[PATH_MAX];
if (!realpath(filename.c_str(), resolved))
throw Error("cannot canonicalise path " + filename);
filename = resolved;
}
return filename;
}
string printHash(unsigned char * buf)
{
ostringstream str;
for (int i = 0; i < 16; i++) {
str.fill('0');
str.width(2);
str << hex << (int) buf[i];
}
return str.str();
}
/* Verify that a reference is valid (that is, is a MD5 hash code). */
void checkHash(const string & s)
{
string err = "invalid reference: " + s;
if (s.length() != 32)
throw BadRefError(err);
for (int i = 0; i < 32; i++) {
char c = s[i];
if (!((c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'f')))
throw BadRefError(err);
}
}
/* Compute the MD5 hash of a file. */
string hashFile(string filename)
{
unsigned char hash[16];
FILE * file = fopen(filename.c_str(), "rb");
if (!file)
throw BadRefError("file `" + filename + "' does not exist");
int err = md5_stream(file, hash);
fclose(file);
if (err) throw BadRefError("cannot hash file");
return printHash(hash);
}
#endif /* !__UTIL_H */

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@ -0,0 +1,10 @@
Descr(
[ Bind("pkgId", Str("aterm-2.0"))
, Bind("releaseId", Str("1"))
, Bind("createGCC", Bool(True))
, Bind("src", File(Url("http://www.cwi.nl/projects/MetaEnv/aterm/aterm-2.0.tar.gz")))
, Bind("build", File(Local("../build/aterm-build.sh")))
]
)

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@ -1,19 +0,0 @@
#! /bin/sh
if test -z "$NIX"; then NIX=/nix; fi
echo target $NIX
if ! nix-instantiate $NIX/var/nix/descriptors $NIX/var/nix/sources tmpl/*.nix; then
exit 1;
fi
rm -f build/*~
cp -p build/* $NIX/var/nix/sources
for i in $NIX/var/nix/sources/*; do nix regfile $i; done
for i in $NIX/var/nix/descriptors/*; do
md5sum $i
nix regfile $i
done