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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
Download patch file Download diff file Expand all files Collapse all files

62
src/nix.cc
View file

@ -28,6 +28,9 @@ static string dbInstPkgs = "pkginst";
static string dbPrebuilts = "prebuilts";
static string nixSourcesDir;
/* Wrapper classes that ensures that the database is closed upon
object destruction. */
class Db2 : public Db
@ -435,9 +438,9 @@ void exportPkgs(string outDir,
string pkgDir = getPkg(hash);
string tmpFile = outDir + "/export_tmp";
string cmd = "cd " + pkgDir + " && tar cvfj " + tmpFile + " .";
string cmd = "cd " + pkgDir + " && tar cfj " + tmpFile + " .";
int res = system(cmd.c_str()); // !!! escaping
if (WEXITSTATUS(res) != 0)
if (!WIFEXITED(res) || WEXITSTATUS(res) != 0)
throw Error("cannot tar " + pkgDir);
string prebuiltHash = hashFile(tmpFile);
@ -458,10 +461,12 @@ void regPrebuilt(string pkgHash, string prebuiltHash)
}
void registerFile(string filename)
string registerFile(string filename)
{
filename = absPath(filename);
setDB(dbRefs, hashFile(filename), filename);
string hash = hashFile(filename);
setDB(dbRefs, hash, filename);
return hash;
}
@ -618,8 +623,46 @@ void printGraph(Strings::iterator first, Strings::iterator last)
}
void run(Strings args)
/* 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;
/* Fetch the object referenced by id. */
if (isHash(id)) {
throw Error("not implemented");
} else {
fn = fetchURL(id);
}
/* Register it by hash. */
string hash = registerFile(fn);
cout << hash << endl;
}
void fetch(Strings::iterator first, Strings::iterator last)
{
for (Strings::iterator it = first; it != last; it++)
fetch(*it);
}
@ -675,6 +718,11 @@ Subcommands:
graph HASH...
Like closure, but print a dot graph specification.
fetch ID...
Fetch the objects identified by ID and place them in the Nix
sources directory. ID can be a hash or URL. Print out the hash
of the object.
";
}
@ -686,6 +734,8 @@ void run(Strings::iterator argCur, Strings::iterator argEnd)
char * homeDir = getenv(nixHomeDirEnvVar.c_str());
if (homeDir) nixHomeDir = homeDir;
nixSourcesDir = nixHomeDir + "/var/nix/sources";
/* Parse the global flags. */
for ( ; argCur != argEnd; argCur++) {
string arg(*argCur);
@ -742,6 +792,8 @@ void run(Strings::iterator argCur, Strings::iterator argEnd)
printClosure(argCur, argEnd);
} else if (cmd == "graph") {
printGraph(argCur, argEnd);
} else if (cmd == "fetch") {
fetch(argCur, argEnd);
} else
throw UsageError("unknown command: " + string(cmd));
}