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* Nix can now fetch prebuilts (and other files) from the network, iff

Browse source 
a mapping from the hash to a url has been registered through `nix
  regurl'.

* Bug fix in nix: don't pollute stdout when running tar, it made
  nix-switch barf.

* Bug fix in nix-push-prebuilts: don't create a subdirectory on the
  target when rsync'ing.
This commit is contained in:
Eelco Dolstra 2003-05-26 09:44:18 +00:00
parent 13176d74cc
commit f8d91f20e6
6 changed files with 121 additions and 58 deletions
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2
scripts/Makefile.am
View file

@ -1,4 +1,4 @@
bin_SCRIPTS = nix-generate-regscript nix-switch nix-collect-garbage \
bin_SCRIPTS = nix-switch nix-collect-garbage \
nix-pull-prebuilts nix-push-prebuilts
install-exec-local:

16
scripts/nix-pull-prebuilts
View file

@ -9,13 +9,25 @@ my $conffile = "$etcdir/prebuilts.conf";
sub register {
my $fn = shift;
my $url = shift;
return unless $fn =~ /([^\/]*)-([0-9a-z]{32})-([0-9a-z]{32})\.tar\.bz2/;
my $id = $1;
my $pkghash = $2;
my $prebuilthash = $3;
print "$pkghash => $prebuilthash ($id)\n";
system "nix regprebuilt $pkghash $prebuilthash";
if ($?) { die "`nix regprebuilt' failed"; }
if ($url =~ /^\//) {
system "nix regfile $url";
if ($?) { die "`nix regfile' failed"; }
} else {
system "nix regurl $prebuilthash $url";
if ($?) { die "`nix regurl' failed"; }
}
print KNOWNS "$pkghash\n";
}
@ -35,7 +47,7 @@ while (<CONFFILE>) {
# It's a local path.
foreach my $fn (glob "$url/*") {
register $fn;
register($fn, $fn);
}
} else {
@ -54,7 +66,7 @@ while (<CONFFILE>) {
my $fn = $1;
next if $fn =~ /\.\./;
next if $fn =~ /\//;
register $fn;
register($fn, "$url/$fn");
}
close INDEX;

10
scripts/nix-push-prebuilts
View file

@ -17,7 +17,6 @@ close KNOWNS;
# For each installed package, check whether a prebuilt is known.
open PKGS, "nix listinst|";
open KNOWNS, ">>$knowns";
while (<PKGS>) {
chomp;
@ -28,13 +27,16 @@ while (<PKGS>) {
print "exporting $pkghash...\n";
system "nix export '$exportdir' $pkghash";
if ($?) { die "`nix export' failed"; }
print KNOWNS "$pkghash\n";
}
}
close KNOWNS;
close PKGS;
# Push the prebuilts to the server. !!! FIXME
system "rsync -av -e ssh '$exportdir' losser:/home/eelco/public_html/nix-prebuilts/";
system "rsync -av -e ssh '$exportdir'/ losser:/home/eelco/public_html/nix-prebuilts/";
# Rerun `nix-pull-prebuilts' to rescan the prebuilt source locations.
print "running nix-pull-prebuilts...";
system "nix-pull-prebuilts";

2
scripts/nix-switch
View file

@ -30,7 +30,7 @@ while (-e "$linkdir/$id-$nr") { $nr++; }
my $link = "$linkdir/$id-$nr";
# Create a symlink from $link to $pkgdir.
symlink($pkgdir, $link) or die "cannot create $link";
symlink($pkgdir, $link) or die "cannot create $link: $!";
# Also store the hash of $pkgdir. This is useful for garbage
# collection and the like.

23
src/fix.cc
View file

@ -23,15 +23,24 @@ static bool verbose = false;
typedef map<string, string> DescriptorMap;
/* Forward declarations. */
void registerFile(string filename)
{
int res = system(("nix regfile " + filename).c_str());
int res = system(("nix regfile " + filename).c_str());
/* !!! escape */
if (WEXITSTATUS(res) != 0)
throw Error("cannot register " + filename + " with Nix");
}
void registerURL(string hash, string url)
{
int res = system(("nix regurl " + hash + " " + url).c_str());
/* !!! escape */
if (WEXITSTATUS(res) != 0)
throw Error("cannot register " + hash + " -> " + url + " with Nix");
}
Error badTerm(const string & msg, ATerm e)
{
char * s = ATwriteToString(e);
@ -152,6 +161,7 @@ ATerm evaluate(ATerm e, EvalContext ctx)
else if (ATmatch(e, "Local(<term>)", &e2)) {
string filename = absPath(evaluateStr(e2, ctx), ctx.dir); /* !!! */
string hash = hashFile(filename);
registerFile(filename); /* !!! */
return ATmake("File(<str>)", hash.c_str());
}
@ -161,12 +171,7 @@ ATerm evaluate(ATerm e, EvalContext ctx)
string hash = evaluateStr(e2, ctx);
checkHash(hash);
string url = evaluateStr(e3, ctx);
#if 0
if (verbose)
cerr << "fetching " << url << endl;
string filename = fetchURL(url);
#endif
/* !!! register */
registerURL(hash, url);
return ATmake("File(<str>)", hash.c_str());
}

126
src/nix.cc
View file

@ -26,6 +26,7 @@ using namespace std;
static string dbRefs = "refs";
static string dbInstPkgs = "pkginst";
static string dbPrebuilts = "prebuilts";
static string dbNetSources = "netsources";
static string nixSourcesDir;
@ -116,6 +117,65 @@ void enumDB(const string & dbname, DBPairs & contents)
}
/* Download object referenced by the given URL into the sources
directory. Return the file name it was downloaded to. */
string fetchURL(string url)
{
string filename = baseNameOf(url);
string fullname = nixSourcesDir + "/" + filename;
struct stat st;
if (stat(fullname.c_str(), &st)) {
cerr << "fetching " << url << endl;
/* !!! 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;
}
/* Obtain an object with the given hash. If a file with that hash is
known to exist in the local file system (as indicated by the dbRefs
database), we use that. Otherwise, we attempt to fetch it from the
network (using dbNetSources). We verify that the file has the
right hash. */
string getFile(string hash)
{
bool checkedNet = false;
while (1) {
string fn, url;
if (queryDB(dbRefs, hash, fn)) {
/* Verify that the file hasn't changed. !!! race */
if (hashFile(fn) != hash)
throw Error("file " + fn + " is stale");
return fn;
}
if (checkedNet)
throw Error("consistency problem: file fetched from " + url +
" should have hash " + hash + ", but it doesn't");
if (!queryDB(dbNetSources, hash, url))
throw Error("a file with hash " + hash + " is requested, "
"but it is not known to exist locally or on the network");
checkedNet = true;
fn = fetchURL(url);
setDB(dbRefs, hash, fn);
}
}
typedef map<string, string> Params;
@ -124,14 +184,7 @@ void readPkgDescr(const string & hash,
{
string pkgfile;
if (!queryDB(dbRefs, hash, pkgfile))
throw Error("unknown package " + hash);
// cerr << "reading information about " + hash + " from " + pkgfile + "\n";
/* Verify that the file hasn't changed. !!! race */
if (hashFile(pkgfile) != hash)
throw Error("file " + pkgfile + " is stale");
pkgfile = getFile(hash);
ATerm term = ATreadFromNamedFile(pkgfile.c_str());
if (!term) throw Error("cannot read aterm " + pkgfile);
@ -199,11 +252,7 @@ void fetchDeps(string hash, Environment & env)
string file;
if (!queryDB(dbRefs, it->second, file))
throw Error("unknown file " + it->second);
if (hashFile(file) != it->second)
throw Error("file " + file + " is stale");
file = getFile(it->second);
env[it->first] = file;
}
@ -283,17 +332,18 @@ void installPkg(string hash)
/* Try to use a prebuilt. */
string prebuiltHash, prebuiltFile;
if (queryDB(dbPrebuilts, hash, prebuiltHash) &&
queryDB(dbRefs, prebuiltHash, prebuiltFile))
{
cerr << "substituting prebuilt " << prebuiltFile << endl;
if (queryDB(dbPrebuilts, hash, prebuiltHash)) {
if (hashFile(prebuiltFile) != prebuiltHash) {
cerr << "prebuilt " + prebuiltFile + " is stale\n";
try {
prebuiltFile = getFile(prebuiltHash);
} catch (Error e) {
cerr << "cannot obtain prebuilt (ignoring): " << e.what() << endl;
goto build;
}
cerr << "substituting prebuilt " << prebuiltFile << endl;
int res = system(("tar xvfj " + prebuiltFile).c_str()); // !!! escaping
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. */
@ -302,6 +352,8 @@ void installPkg(string hash)
_exit(0);
}
throw Error("no prebuilt available");
build:
/* Fill in the environment. We don't bother freeing the
@ -453,7 +505,7 @@ void exportPkgs(string outDir,
}
void regPrebuilt(string pkgHash, string prebuiltHash)
void registerPrebuilt(string pkgHash, string prebuiltHash)
{
checkHash(pkgHash);
checkHash(prebuiltHash);
@ -470,6 +522,14 @@ string registerFile(string filename)
}
void registerURL(string hash, string url)
{
checkHash(hash);
setDB(dbNetSources, hash, url);
/* !!! currently we allow only one network source per hash */
}
/* This is primarily used for bootstrapping. */
void registerInstalledPkg(string hash, string path)
{
@ -486,6 +546,7 @@ void initDB()
openDB(dbRefs, false);
openDB(dbInstPkgs, false);
openDB(dbPrebuilts, false);
openDB(dbNetSources, false);
}
@ -623,25 +684,6 @@ void printGraph(Strings::iterator first, Strings::iterator last)
}
/* Download object referenced by the given URL into the sources
directory. Return the file name it was downloaded to. */
string fetchURL(string url)
{
string filename = baseNameOf(url);
string fullname = nixSourcesDir + "/" + filename;
struct stat st;
if (stat(fullname.c_str(), &st)) {
/* !!! 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;
}
void fetch(string id)
{
string fn;
@ -777,9 +819,11 @@ void run(Strings::iterator argCur, Strings::iterator argEnd)
exportPkgs(*argCur, argCur + 1, argEnd);
} else if (cmd == "regprebuilt") {
if (argc != 2) throw argcError;
regPrebuilt(*argCur, argCur[1]);
registerPrebuilt(*argCur, argCur[1]);
} else if (cmd == "regfile") {
for_each(argCur, argEnd, registerFile);
} else if (cmd == "regurl") {
registerURL(argCur[0], argCur[1]);
} else if (cmd == "reginst") {
if (argc != 2) throw argcError;
registerInstalledPkg(*argCur, argCur[1]);