forked from lix-project/lix
172 lines
3.5 KiB
C++
172 lines
3.5 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 void expect(std::istream & str, const string & s)
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{
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char s2[s.size()];
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str.read(s2, s.size());
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if (string(s2, s.size()) != s)
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throw Error(format("expected string `%1%'") % s);
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}
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static string parseString(std::istream & str)
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{
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string res;
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expect(str, "\"");
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int c;
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while ((c = str.get()) != '"')
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if (c == '\\') {
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c = str.get();
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if (c == 'n') res += '\n';
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else if (c == 'r') res += '\r';
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else if (c == 't') res += '\t';
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else res += c;
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}
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else res += c;
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return res;
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}
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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 bool endOfList(std::istream & str)
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{
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if (str.peek() == ',') {
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str.get();
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return false;
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}
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if (str.peek() == ']') {
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str.get();
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return true;
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}
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return false;
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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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