mirror of
https://github.com/NixOS/nix.git
synced 2024-11-22 23:02:27 +00:00
* Cleanup.
This commit is contained in:
Eelco Dolstra
parent
207ff2caf0
commit
01b34fe584
36
src/eval.cc
36
src/eval.cc
@ -106,7 +106,7 @@ static void runProgram(const string & program, Environment env)
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} catch (exception & e) {
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cerr << format("build error: %1%\n") % e.what();
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}
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}
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_exit(1);
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}
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@ -159,38 +159,6 @@ Hash hashTerm(ATerm t)
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}
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#if 0
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/* Evaluate a list of arguments into normal form. */
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void evalArgs(ATermList args, ATermList & argsNF, Environment & env)
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{
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argsNF = ATempty;
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while (!ATisEmpty(args)) {
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ATerm eName, eVal, arg = ATgetFirst(args);
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if (!ATmatch(arg, "Tup(<term>, <term>)", &eName, &eVal))
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throw badTerm("invalid argument", arg);
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string name = evalString(eName);
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eVal = evalValue(eVal);
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char * s;
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if (ATmatch(eVal, "Str(<str>)", &s)) {
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env[name] = s;
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} else if (ATmatch(eVal, "Hash(<str>)", &s)) {
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env[name] = queryValuePath(parseHash(s));
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} else throw badTerm("invalid argument value", eVal);
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argsNF = ATinsert(argsNF,
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ATmake("Tup(Str(<str>), <term>)", name.c_str(), eVal));
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args = ATgetNext(args);
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}
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argsNF = ATreverse(argsNF);
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}
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#endif
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struct RStatus
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{
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/* !!! the comparator of this hash should match the semantics of
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@ -362,7 +330,7 @@ static FState realise(RStatus & status, FState fs)
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return nf;
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}
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throw badTerm("bad file system state expression", fs);
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throw badTerm("bad fstate expression", fs);
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}
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368
src/fix.cc
368
src/fix.cc
@ -1,368 +0,0 @@
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#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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#include "hash.hh"
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static string nixDescriptorDir;
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static bool verbose = false;
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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, Hash> DescriptorMap;
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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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/* !!! escape */
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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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void registerURL(Hash hash, string url)
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{
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int res = system(("nix regurl " + (string) hash + " " + url).c_str());
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/* !!! escape */
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if (WEXITSTATUS(res) != 0)
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throw Error("cannot register " +
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(string) hash + " -> " + url + " with Nix");
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}
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Error badTerm(const string & msg, ATerm e)
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{
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char * s = ATwriteToString(e);
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return Error(msg + ", in `" + s + "'");
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}
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/* Term evaluation. */
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typedef map<string, ATerm> BindingsMap;
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struct EvalContext
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{
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string dir;
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DescriptorMap * done;
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BindingsMap * vars;
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};
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ATerm evaluate(ATerm e, EvalContext ctx);
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Hash instantiateDescriptor(string filename, EvalContext ctx);
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string evaluateStr(ATerm e, EvalContext ctx)
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{
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e = evaluate(e, ctx);
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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 throw badTerm("string value expected", e);
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}
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bool evaluateBool(ATerm e, EvalContext ctx)
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{
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e = evaluate(e, ctx);
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if (ATmatch(e, "Bool(True)"))
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return true;
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else if (ATmatch(e, "Bool(False)"))
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return false;
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else throw badTerm("boolean value expected", e);
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}
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ATerm evaluate(ATerm e, EvalContext ctx)
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{
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char * s;
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ATerm e2, e3;
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ATerm eCond, eTrue, eFalse;
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/* Check for normal forms first. */
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if (ATmatch(e, "Str(<str>)", &s) ||
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ATmatch(e, "Bool(True)") || ATmatch(e, "Bool(False)"))
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return e;
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else if (
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ATmatch(e, "Pkg(<str>)", &s) ||
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ATmatch(e, "File(<str>)", &s))
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{
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parseHash(s);
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return e;
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}
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/* Short-hands. */
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else if (ATmatch(e, "<str>", &s))
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return ATmake("Str(<str>)", s);
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else if (ATmatch(e, "True", &s))
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return ATmake("Bool(True)", s);
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else if (ATmatch(e, "False", &s))
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return ATmake("Bool(False)", s);
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/* Functions. */
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/* `Var' looks up a variable. */
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else if (ATmatch(e, "Var(<str>)", &s)) {
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string name(s);
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ATerm e2 = (*ctx.vars)[name];
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if (!e2) throw Error("undefined variable " + name);
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return evaluate(e2, ctx); /* !!! update binding */
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}
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/* `Fix' recursively instantiates a Fix descriptor, returning the
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hash of the generated Nix descriptor. */
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else if (ATmatch(e, "Fix(<term>)", &e2)) {
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string filename = absPath(evaluateStr(e2, ctx), ctx.dir); /* !!! */
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return ATmake("Pkg(<str>)",
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((string) instantiateDescriptor(filename, ctx)).c_str());
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}
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#if 0
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/* `Source' copies the specified file to nixSourcesDir, registers
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it with Nix, and returns the hash of the file. */
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else if (ATmatch(e, "Source(<term>)", &e2)) {
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string source = absPath(evaluateStr(e2, ctx), ctx.dir); /* !!! */
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string target = nixSourcesDir + "/" + baseNameOf(source);
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// Don't copy if filename is already in nixSourcesDir.
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if (source != target) {
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if (verbose)
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cerr << "copying source " << source << endl;
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string cmd = "cp -p " + source + " " + target;
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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 " + source + " to " + target);
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}
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registerFile(target);
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return ATmake("File(<str>)", hashFile(target).c_str());
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}
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#endif
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/* `Local' registers a file with Nix, and returns the file's
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hash. */
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else if (ATmatch(e, "Local(<term>)", &e2)) {
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string filename = absPath(evaluateStr(e2, ctx), ctx.dir); /* !!! */
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Hash hash = hashFile(filename);
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registerFile(filename); /* !!! */
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return ATmake("File(<str>)", ((string) hash).c_str());
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}
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/* `Url' registers a mapping from a hash to an url with Nix, and
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returns the hash. */
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else if (ATmatch(e, "Url(<term>, <term>)", &e2, &e3)) {
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Hash hash = parseHash(evaluateStr(e2, ctx));
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string url = evaluateStr(e3, ctx);
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registerURL(hash, url);
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return ATmake("File(<str>)", ((string) hash).c_str());
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}
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/* `If' provides conditional evaluation. */
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else if (ATmatch(e, "If(<term>, <term>, <term>)",
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&eCond, &eTrue, &eFalse))
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return evaluate(evaluateBool(eCond, ctx) ? eTrue : eFalse, ctx);
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else throw badTerm("invalid expression", e);
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}
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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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Hash instantiateDescriptor(string filename, EvalContext ctx)
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{
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/* Already done? */
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DescriptorMap::iterator isInMap = ctx.done->find(filename);
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if (isInMap != ctx.done->end()) return isInMap->second;
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/* No. */
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ctx.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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ctx.vars = &bindingsMap;
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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, ctx);
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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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Hash outHash = hashFile(tmpFilename);
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string outFilename = nixDescriptorDir + "/" +
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id + "-" + (string) 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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/* Register it with Nix. */
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registerFile(outFilename);
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if (verbose)
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cerr << "instantiated " << (string) outHash
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<< " from " << filename << endl;
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(*ctx.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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EvalContext ctx;
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ctx.done = &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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cout << (string) instantiateDescriptor(filename, ctx) << endl;
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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 ...\n\
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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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umask(0022);
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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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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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} else if (arg == "-v" || arg == "--verbose") {
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verbose = true;
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} else 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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@ -21,7 +21,13 @@ extern string dbRefs;
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with hash h2.
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Note that a term $y$ is successor of $x$ iff there exists a
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sequence of rewrite steps that rewrites $x$ into $y$. */
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sequence of rewrite steps that rewrites $x$ into $y$.
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Also note that instead of a successor, $y$ can be any term
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equivalent to $x$, that is, reducing to the same result, as long as
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$x$ is equal to or a successor of $y$. (This is useful, e.g., for
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shared derivate caching over the network).
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*/
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extern string dbSuccessors;
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/* dbNetSources :: Hash -> URL
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