forked from lix-project/lix
415 lines
11 KiB
C++
415 lines
11 KiB
C++
#include "globals.hh"
|
|
#include "normalise.hh"
|
|
#include "shared.hh"
|
|
#include "parser.hh"
|
|
#include "eval.hh"
|
|
|
|
|
|
typedef void (* Operation) (EvalState & state,
|
|
Strings opFlags, Strings opArgs);
|
|
|
|
|
|
struct DrvInfo
|
|
{
|
|
string name;
|
|
Path drvPath;
|
|
Path outPath;
|
|
Hash drvHash;
|
|
};
|
|
|
|
typedef map<Path, DrvInfo> DrvInfos;
|
|
|
|
|
|
bool parseDerivation(EvalState & state, Expr e, DrvInfo & drv)
|
|
{
|
|
ATMatcher m;
|
|
|
|
e = evalExpr(state, e);
|
|
if (!(atMatch(m, e) >> "Attrs")) return false;
|
|
Expr a = queryAttr(e, "type");
|
|
if (!a || evalString(state, a) != "derivation") return false;
|
|
|
|
a = queryAttr(e, "name");
|
|
if (!a) throw badTerm("derivation name missing", e);
|
|
drv.name = evalString(state, a);
|
|
|
|
a = queryAttr(e, "drvPath");
|
|
if (!a) throw badTerm("derivation path missing", e);
|
|
drv.drvPath = evalPath(state, a);
|
|
|
|
a = queryAttr(e, "drvHash");
|
|
if (!a) throw badTerm("derivation hash missing", e);
|
|
drv.drvHash = parseHash(evalString(state, a));
|
|
|
|
a = queryAttr(e, "outPath");
|
|
if (!a) throw badTerm("output path missing", e);
|
|
drv.outPath = evalPath(state, a);
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
bool parseDerivations(EvalState & state, Expr e, DrvInfos & drvs)
|
|
{
|
|
ATMatcher m;
|
|
ATermList es;
|
|
|
|
e = evalExpr(state, e);
|
|
|
|
if (atMatch(m, e) >> "Attrs") {
|
|
ATermMap drvMap;
|
|
queryAllAttrs(e, drvMap);
|
|
|
|
for (ATermIterator i(drvMap.keys()); i; ++i) {
|
|
DrvInfo drv;
|
|
debug(format("evaluating attribute `%1%'") % *i);
|
|
if (parseDerivation(state, drvMap.get(*i), drv))
|
|
drvs[drv.drvPath] = drv;
|
|
}
|
|
}
|
|
|
|
else if (atMatch(m, e) >> "List" >> es) {
|
|
for (ATermIterator i(es); i; ++i) {
|
|
DrvInfo drv;
|
|
debug(format("evaluating list element"));
|
|
if (parseDerivation(state, *i, drv))
|
|
drvs[drv.drvPath] = drv;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
void loadDerivations(EvalState & state, Path nePath, DrvInfos & drvs)
|
|
{
|
|
Expr e = parseExprFromFile(absPath(nePath));
|
|
if (!parseDerivations(state, e, drvs))
|
|
throw badTerm("expected set of derivations", e);
|
|
}
|
|
|
|
|
|
static Path getLinksDir()
|
|
{
|
|
return canonPath(nixStateDir + "/links");
|
|
}
|
|
|
|
|
|
static Path getCurrentPath()
|
|
{
|
|
return getLinksDir() + "/current";
|
|
}
|
|
|
|
|
|
void queryInstalled(EvalState & state, DrvInfos & drvs)
|
|
{
|
|
Path path = getCurrentPath() + "/manifest";
|
|
|
|
if (!pathExists(path)) return; /* not an error, assume nothing installed */
|
|
|
|
Expr e = ATreadFromNamedFile(path.c_str());
|
|
if (!e) throw Error(format("cannot read Nix expression from `%1%'") % path);
|
|
|
|
if (!parseDerivations(state, e, drvs))
|
|
throw badTerm(format("expected set of derivations in `%1%'") % path, e);
|
|
}
|
|
|
|
|
|
Path createLink(Path outPath, Path drvPath)
|
|
{
|
|
Path linksDir = getLinksDir();
|
|
|
|
unsigned int num = 0;
|
|
|
|
Strings names = readDirectory(linksDir);
|
|
for (Strings::iterator i = names.begin(); i != names.end(); ++i) {
|
|
istringstream s(*i);
|
|
unsigned int n;
|
|
if (s >> n && s.eof() && n >= num) num = n + 1;
|
|
}
|
|
|
|
Path linkPath;
|
|
|
|
while (1) {
|
|
linkPath = (format("%1%/%2%") % linksDir % num).str();
|
|
if (symlink(outPath.c_str(), linkPath.c_str()) == 0) break;
|
|
if (errno != EEXIST)
|
|
throw SysError(format("creating symlink `%1%'") % linkPath);
|
|
/* Somebody beat us to it, retry with a higher number. */
|
|
num++;
|
|
}
|
|
|
|
writeStringToFile(linkPath + "-src.id", drvPath);
|
|
|
|
return linkPath;
|
|
}
|
|
|
|
|
|
void switchLink(Path link, Path target)
|
|
{
|
|
Path tmp = canonPath(dirOf(link) + "/.new_" + baseNameOf(link));
|
|
if (symlink(target.c_str(), tmp.c_str()) != 0)
|
|
throw SysError(format("creating symlink `%1%'") % tmp);
|
|
/* The rename() system call is supposed to be essentially atomic
|
|
on Unix. That is, if we have links `current -> X' and
|
|
`new_current -> Y', and we rename new_current to current, a
|
|
process accessing current will see X or Y, but never a
|
|
file-not-found or other error condition. This is sufficient to
|
|
atomically switch user environments. */
|
|
if (rename(tmp.c_str(), link.c_str()) != 0)
|
|
throw SysError(format("renaming `%1%' to `%2%'") % tmp % link);
|
|
}
|
|
|
|
|
|
void createUserEnv(EvalState & state, const DrvInfos & drvs)
|
|
{
|
|
/* Get the environment builder expression. */
|
|
Expr envBuilder = parseExprFromFile("/home/eelco/nix/corepkgs/buildenv"); /* !!! */
|
|
|
|
/* Construct the whole top level derivation. */
|
|
ATermList inputs = ATempty;
|
|
for (DrvInfos::const_iterator i = drvs.begin();
|
|
i != drvs.end(); ++i)
|
|
{
|
|
ATerm t = ATmake(
|
|
"Attrs(["
|
|
"Bind(\"type\", Str(\"derivation\")), "
|
|
"Bind(\"name\", Str(<str>)), "
|
|
"Bind(\"drvPath\", Path(<str>)), "
|
|
"Bind(\"drvHash\", Str(<str>)), "
|
|
"Bind(\"outPath\", Path(<str>))"
|
|
"])",
|
|
i->second.name.c_str(),
|
|
i->second.drvPath.c_str(),
|
|
((string) i->second.drvHash).c_str(),
|
|
i->second.outPath.c_str());
|
|
inputs = ATinsert(inputs, t);
|
|
}
|
|
|
|
ATerm inputs2 = ATmake("List(<term>)", ATreverse(inputs));
|
|
|
|
/* Also write a copy of the list of inputs to the store; we need
|
|
it for future modifications of the environment. */
|
|
Path inputsFile = writeTerm(inputs2, "-env-inputs");
|
|
|
|
Expr topLevel = ATmake(
|
|
"Call(<term>, Attrs(["
|
|
"Bind(\"system\", Str(<str>)), "
|
|
"Bind(\"derivations\", <term>), " // !!! redundant
|
|
"Bind(\"manifest\", Path(<str>))"
|
|
"]))",
|
|
envBuilder, thisSystem.c_str(), inputs2, inputsFile.c_str());
|
|
|
|
/* Instantiate it. */
|
|
debug(format("evaluating builder expression `%1%'") % topLevel);
|
|
DrvInfo topLevelDrv;
|
|
if (!parseDerivation(state, topLevel, topLevelDrv))
|
|
abort();
|
|
|
|
/* Realise the resulting store expression. */
|
|
debug(format("realising user environment"));
|
|
Path nfPath = normaliseStoreExpr(topLevelDrv.drvPath);
|
|
realiseClosure(nfPath);
|
|
|
|
/* Switch the current user environment to the output path. */
|
|
debug(format("switching to new user environment"));
|
|
Path linkPath = createLink(topLevelDrv.outPath, topLevelDrv.drvPath);
|
|
switchLink(getLinksDir() + "/current", linkPath);
|
|
}
|
|
|
|
|
|
typedef map<string, Path> NameMap;
|
|
|
|
|
|
NameMap mapByNames(DrvInfos & drvs)
|
|
{
|
|
NameMap nameMap;
|
|
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
|
|
nameMap[i->second.name] = i->first;
|
|
return nameMap;
|
|
}
|
|
|
|
|
|
void installDerivations(EvalState & state,
|
|
Path nePath, Strings drvNames)
|
|
{
|
|
debug(format("installing derivations from `%1%'") % nePath);
|
|
|
|
/* Fetch all derivations from the input file. */
|
|
DrvInfos availDrvs;
|
|
loadDerivations(state, nePath, availDrvs);
|
|
|
|
NameMap nameMap = mapByNames(availDrvs);
|
|
|
|
/* Filter out the ones we're not interested in. */
|
|
DrvInfos selectedDrvs;
|
|
for (Strings::iterator i = drvNames.begin();
|
|
i != drvNames.end(); ++i)
|
|
{
|
|
NameMap::iterator j = nameMap.find(*i);
|
|
if (j == nameMap.end())
|
|
throw Error(format("unknown derivation `%1%'") % *i);
|
|
else
|
|
selectedDrvs[j->second] = availDrvs[j->second];
|
|
}
|
|
|
|
/* Add in the already installed derivations. */
|
|
DrvInfos installedDrvs;
|
|
queryInstalled(state, installedDrvs);
|
|
selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
|
|
|
|
createUserEnv(state, selectedDrvs);
|
|
}
|
|
|
|
|
|
static void opInstall(EvalState & state,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
if (opArgs.size() < 1) throw UsageError("Nix file expected");
|
|
|
|
Path nePath = opArgs.front();
|
|
opArgs.pop_front();
|
|
|
|
installDerivations(state, nePath,
|
|
Strings(opArgs.begin(), opArgs.end()));
|
|
}
|
|
|
|
|
|
void uninstallDerivations(EvalState & state, Strings drvNames)
|
|
{
|
|
DrvInfos installedDrvs;
|
|
queryInstalled(state, installedDrvs);
|
|
|
|
NameMap nameMap = mapByNames(installedDrvs);
|
|
|
|
for (Strings::iterator i = drvNames.begin();
|
|
i != drvNames.end(); ++i)
|
|
{
|
|
NameMap::iterator j = nameMap.find(*i);
|
|
if (j == nameMap.end())
|
|
throw Error(format("unknown derivation `%1%'") % *i);
|
|
else
|
|
installedDrvs.erase(j->second);
|
|
}
|
|
|
|
createUserEnv(state, installedDrvs);
|
|
}
|
|
|
|
|
|
static void opUninstall(EvalState & state,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
uninstallDerivations(state, opArgs);
|
|
}
|
|
|
|
|
|
static void opQuery(EvalState & state,
|
|
Strings opFlags, Strings opArgs)
|
|
{
|
|
enum { qName, qDrvPath, qStatus } query = qName;
|
|
enum { sInstalled, sAvailable } source = sInstalled;
|
|
|
|
for (Strings::iterator i = opFlags.begin();
|
|
i != opFlags.end(); ++i)
|
|
if (*i == "--name") query = qName;
|
|
else if (*i == "--expr" || *i == "-e") query = qDrvPath;
|
|
else if (*i == "--status" || *i == "-s") query = qStatus;
|
|
else if (*i == "--installed") source = sInstalled;
|
|
else if (*i == "--available" || *i == "-f") source = sAvailable;
|
|
else throw UsageError(format("unknown flag `%1%'") % *i);
|
|
|
|
/* Obtain derivation information from the specified source. */
|
|
DrvInfos drvs;
|
|
|
|
switch (source) {
|
|
|
|
case sInstalled:
|
|
queryInstalled(state, drvs);
|
|
break;
|
|
|
|
case sAvailable: {
|
|
if (opArgs.size() < 1) throw UsageError("Nix file expected");
|
|
Path nePath = opArgs.front();
|
|
opArgs.pop_front();
|
|
loadDerivations(state, nePath, drvs);
|
|
break;
|
|
}
|
|
|
|
default: abort();
|
|
}
|
|
|
|
if (opArgs.size() != 0) throw UsageError("no arguments expected");
|
|
|
|
/* Perform the specified query on the derivations. */
|
|
switch (query) {
|
|
|
|
case qName: {
|
|
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
|
|
cout << format("%1%\n") % i->second.name;
|
|
break;
|
|
}
|
|
|
|
case qDrvPath: {
|
|
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i)
|
|
cout << format("%1%\n") % i->second.drvPath;
|
|
break;
|
|
}
|
|
|
|
case qStatus: {
|
|
DrvInfos installed;
|
|
queryInstalled(state, installed);
|
|
|
|
for (DrvInfos::iterator i = drvs.begin(); i != drvs.end(); ++i) {
|
|
cout << format("%1%%2% %3%\n")
|
|
% (installed.find(i->first) != installed.end() ? 'I' : '-')
|
|
% (isValidPath(i->second.outPath) ? 'P' : '-')
|
|
% i->second.name;
|
|
}
|
|
break;
|
|
}
|
|
|
|
default: abort();
|
|
}
|
|
}
|
|
|
|
|
|
void run(Strings args)
|
|
{
|
|
EvalState state;
|
|
Strings opFlags, opArgs;
|
|
Operation op = 0;
|
|
|
|
for (Strings::iterator i = args.begin(); i != args.end(); ++i) {
|
|
string arg = *i;
|
|
|
|
Operation oldOp = op;
|
|
|
|
if (arg == "--install" || arg == "-i")
|
|
op = opInstall;
|
|
else if (arg == "--uninstall" || arg == "-u")
|
|
op = opUninstall;
|
|
else if (arg == "--query" || arg == "-q")
|
|
op = opQuery;
|
|
else if (arg == "--verbose" || arg == "-v")
|
|
verbosity = (Verbosity) ((int) verbosity + 1);
|
|
else if (arg[0] == '-')
|
|
opFlags.push_back(arg);
|
|
else
|
|
opArgs.push_back(arg);
|
|
|
|
if (oldOp && oldOp != op)
|
|
throw UsageError("only one operation may be specified");
|
|
}
|
|
|
|
if (!op) throw UsageError("no operation specified");
|
|
|
|
openDB();
|
|
|
|
op(state, opFlags, opArgs);
|
|
|
|
printEvalStats(state);
|
|
}
|
|
|
|
|
|
string programId = "nix-env";
|