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* Prebuilt package sharing. We allow transparent binary deployment by

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sharing package directories (i.e., the result of building a Nix
  descriptor).

  `nix-pull-prebuilts' obtains a list of all known prebuilts by
  consulting the paths and URLs specified in
  $prefix/etc/nix/prebuilts.conf.  The mappings ($pkghash,
  $prebuilthash) and ($prebuilthash, $location) are registered with
  Nix so that it can use the prebuilt with hash $prebuilthash when
  installing a package with hash $pkghash by downloading and unpacking
  $location.

  `nix-push-prebuilts' creates prebuilts for all packages for which no
  prebuilt is known to exist.  It can then optionally upload these
  to the network through rsync.

  `nix-[pull|push]-prebuilts' just provide a policy.  Nix provides the
  mechanism through the `nix [export|regprebuilt|regurl]' commands.
This commit is contained in:
Eelco Dolstra 2003-05-25 22:42:19 +00:00
parent 0ef4b6d0f8
commit 7dd91d3779
9 changed files with 230 additions and 79 deletions
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69
src/fix.cc
View file

@ -13,7 +13,6 @@ extern "C" {
static string nixDescriptorDir;
static string nixSourcesDir;
static bool verbose = false;
@ -33,46 +32,6 @@ void registerFile(string filename)
throw Error("cannot register " + filename + " with Nix");
}
/* 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);
}
/* Return the base name of the given path, i.e., everything following
the final `/'. */
string baseNameOf(string s)
{
unsigned int pos = s.rfind('/');
if (pos == string::npos) throw Error("invalid file name");
return string(s, pos + 1);
}
/* 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;
}
Error badTerm(const string & msg, ATerm e)
{
char * s = ATwriteToString(e);
@ -120,7 +79,7 @@ bool evaluateBool(ATerm e, EvalContext ctx)
ATerm evaluate(ATerm e, EvalContext ctx)
{
char * s;
ATerm e2;
ATerm e2, e3;
ATerm eCond, eTrue, eFalse;
/* Check for normal forms first. */
@ -166,6 +125,7 @@ ATerm evaluate(ATerm e, EvalContext ctx)
instantiateDescriptor(filename, ctx).c_str());
}
#if 0
/* `Source' copies the specified file to nixSourcesDir, registers
it with Nix, and returns the hash of the file. */
else if (ATmatch(e, "Source(<term>)", &e2)) {
@ -185,15 +145,29 @@ ATerm evaluate(ATerm e, EvalContext ctx)
registerFile(target);
return ATmake("File(<str>)", hashFile(target).c_str());
}
#endif
/* `Url' fetches a file from the network, caching it in
nixSourcesDir and returning the file name. */
else if (ATmatch(e, "Url(<term>)", &e2)) {
string url = evaluateStr(e2, ctx);
/* `Local' registers a file with Nix, and returns the file's
hash. */
else if (ATmatch(e, "Local(<term>)", &e2)) {
string filename = absPath(evaluateStr(e2, ctx), ctx.dir); /* !!! */
string hash = hashFile(filename);
return ATmake("File(<str>)", hash.c_str());
}
/* `Url' registers a mapping from a hash to an url with Nix, and
returns the hash. */
else if (ATmatch(e, "Url(<term>, <term>)", &e2, &e3)) {
string hash = evaluateStr(e2, ctx);
checkHash(hash);
string url = evaluateStr(e3, ctx);
#if 0
if (verbose)
cerr << "fetching " << url << endl;
string filename = fetchURL(url);
return ATmake("Str(<str>)", filename.c_str());
#endif
/* !!! register */
return ATmake("File(<str>)", hash.c_str());
}
/* `If' provides conditional evaluation. */
@ -329,7 +303,6 @@ void run(Strings::iterator argCur, Strings::iterator argEnd)
if (homeDir) nixHomeDir = homeDir;
nixDescriptorDir = nixHomeDir + "/var/nix/descriptors";
nixSourcesDir = nixHomeDir + "/var/nix/sources";
for ( ; argCur != argEnd; argCur++) {
string arg(*argCur);