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