131 lines
2.7 KiB
C++
131 lines
2.7 KiB
C++
#include "util.hh"
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#include "get-drvs.hh"
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namespace nix {
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static void readLegacyManifest(const Path & path, DrvInfos & elems);
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DrvInfos queryInstalled(EvalState & state, const Path & userEnv)
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{
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DrvInfos elems;
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Path path = userEnv + "/manifest";
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if (!pathExists(path))
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return DrvInfos(); /* not an error, assume nothing installed */
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readLegacyManifest(path, elems);
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return elems;
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}
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/* Code for parsing manifests in the old textual ATerm format. */
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static string parseStr(std::istream & str)
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{
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expect(str, "Str(");
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string s = parseString(str);
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expect(str, ",[])");
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return s;
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}
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static string parseWord(std::istream & str)
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{
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string res;
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while (isalpha(str.peek()))
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res += str.get();
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return res;
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}
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static MetaInfo parseMeta(std::istream & str)
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{
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MetaInfo meta;
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expect(str, "Attrs([");
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while (!endOfList(str)) {
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expect(str, "Bind(");
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MetaValue value;
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string name = parseString(str);
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expect(str, ",");
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string type = parseWord(str);
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if (type == "Str") {
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expect(str, "(");
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value.type = MetaValue::tpString;
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value.stringValue = parseString(str);
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expect(str, ",[])");
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}
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else if (type == "List") {
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expect(str, "([");
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value.type = MetaValue::tpStrings;
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while (!endOfList(str))
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value.stringValues.push_back(parseStr(str));
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expect(str, ")");
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}
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else throw Error(format("unexpected token `%1%'") % type);
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expect(str, ",NoPos)");
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meta[name] = value;
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}
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expect(str, ")");
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return meta;
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}
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static void readLegacyManifest(const Path & path, DrvInfos & elems)
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{
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string manifest = readFile(path);
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std::istringstream str(manifest);
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expect(str, "List([");
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unsigned int n = 0;
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while (!endOfList(str)) {
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DrvInfo elem;
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expect(str, "Attrs([");
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while (!endOfList(str)) {
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expect(str, "Bind(");
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string name = parseString(str);
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expect(str, ",");
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if (name == "meta") elem.setMetaInfo(parseMeta(str));
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else {
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string value = parseStr(str);
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if (name == "name") elem.name = value;
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else if (name == "outPath") elem.setOutPath(value);
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else if (name == "drvPath") elem.setDrvPath(value);
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else if (name == "system") elem.system = value;
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}
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expect(str, ",NoPos)");
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}
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expect(str, ")");
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if (elem.name != "") {
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elem.attrPath = int2String(n++);
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elems.push_back(elem);
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}
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}
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expect(str, ")");
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}
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}
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