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#include "util.hh"
#include "get-drvs.hh"
namespace nix {
static void readLegacyManifest(const Path & path, DrvInfos & elems);
DrvInfos queryInstalled(EvalState & state, const Path & userEnv)
{
DrvInfos elems;
Path path = userEnv + "/manifest";
if (!pathExists(path))
return DrvInfos(); /* not an error, assume nothing installed */
readLegacyManifest(path, elems);
return elems;
}
/* Code for parsing manifests in the old textual ATerm format. */
static void expect(std::istream & str, const string & s)
{
char s2[s.size()];
str.read(s2, s.size());
if (string(s2, s.size()) != s)
throw Error(format("expected string `%1%'") % s);
}
static string parseString(std::istream & str)
{
string res;
expect(str, "\"");
int c;
while ((c = str.get()) != '"')
if (c == '\\') {
c = str.get();
if (c == 'n') res += '\n';
else if (c == 'r') res += '\r';
else if (c == 't') res += '\t';
else res += c;
}
else res += c;
return res;
}
static string parseStr(std::istream & str)
{
expect(str, "Str(");
string s = parseString(str);
expect(str, ",[])");
return s;
}
static string parseWord(std::istream & str)
{
string res;
while (isalpha(str.peek()))
res += str.get();
return res;
}
static bool endOfList(std::istream & str)
{
if (str.peek() == ',') {
str.get();
return false;
}
if (str.peek() == ']') {
str.get();
return true;
}
return false;
}
static MetaInfo parseMeta(std::istream & str)
{
MetaInfo meta;
expect(str, "Attrs([");
while (!endOfList(str)) {
expect(str, "Bind(");
MetaValue value;
string name = parseString(str);
expect(str, ",");
string type = parseWord(str);
if (type == "Str") {
expect(str, "(");
value.type = MetaValue::tpString;
value.stringValue = parseString(str);
expect(str, ",[])");
}
else if (type == "List") {
expect(str, "([");
value.type = MetaValue::tpStrings;
while (!endOfList(str))
value.stringValues.push_back(parseStr(str));
expect(str, ")");
}
else throw Error(format("unexpected token `%1%'") % type);
expect(str, ",NoPos)");
meta[name] = value;
}
expect(str, ")");
return meta;
}
static void readLegacyManifest(const Path & path, DrvInfos & elems)
{
string manifest = readFile(path);
std::istringstream str(manifest);
expect(str, "List([");
unsigned int n = 0;
while (!endOfList(str)) {
DrvInfo elem;
expect(str, "Attrs([");
while (!endOfList(str)) {
expect(str, "Bind(");
string name = parseString(str);
expect(str, ",");
if (name == "meta") elem.setMetaInfo(parseMeta(str));
else {
string value = parseStr(str);
if (name == "name") elem.name = value;
else if (name == "outPath") elem.setOutPath(value);
else if (name == "drvPath") elem.setDrvPath(value);
else if (name == "system") elem.system = value;
}
expect(str, ",NoPos)");
}
expect(str, ")");
if (elem.name != "") {
elem.attrPath = int2String(n++);
elems.push_back(elem);
}
}
expect(str, ")");
}
}
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