TakeV
/
guix
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

* Installation: add the previously installed packages. Switch to the new 

configuration.
* Status queries.
This commit is contained in:
Eelco Dolstra 2003-11-19 21:32:03 +00:00
parent 9898746ef3
commit e0b5a492f5
1 changed files with 111 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

130
src/nix-env/main.cc
View File

@ -16,7 +16,7 @@ struct DrvInfo
Path outPath;
};
typedef map<string, DrvInfo> DrvInfos;
typedef map<Path, DrvInfo> DrvInfos;
bool parseDerivation(EvalState & state, Expr e, DrvInfo & drv)
@ -46,16 +46,30 @@ bool parseDerivation(EvalState & state, Expr e, DrvInfo & drv)
bool parseDerivations(EvalState & state, Expr e, DrvInfos & drvs)
{
ATMatcher m;
ATermList es;
e = evalExpr(state, e);
ATermMap drvMap;
queryAllAttrs(e, drvMap);
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.name] = drv;
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") % *i);
if (parseDerivation(state, *i, drv))
drvs[drv.drvPath] = drv;
}
}
return true;
@ -76,6 +90,26 @@ static Path getLinksDir()
}
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();
@ -86,18 +120,40 @@ Path createLink(Path outPath, Path drvPath)
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;
if (s >> n && s.eof() && n >= num) num = n + 1;
}
Path linkPath = (format("%1%/%2%") % linksDir % num).str();
Path linkPath;
if (symlink(outPath.c_str(), linkPath.c_str()) != 0)
throw SysError(format("creating symlink `%1%'") % 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++;
}
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 installDerivations(EvalState & state,
Path nePath, Strings drvNames)
{
@ -107,18 +163,30 @@ void installDerivations(EvalState & state,
DrvInfos availDrvs;
loadDerivations(state, nePath, availDrvs);
typedef map<string, Path> NameMap;
NameMap nameMap;
for (DrvInfos::iterator i = availDrvs.begin();
i != availDrvs.end(); ++i)
nameMap[i->second.name] = i->first;
/* Filter out the ones we're not interested in. */
DrvInfos selectedDrvs;
for (Strings::iterator i = drvNames.begin();
i != drvNames.end(); ++i)
{
DrvInfos::iterator j = availDrvs.find(*i);
if (j == availDrvs.end())
NameMap::iterator j = nameMap.find(*i);
if (j == nameMap.end())
throw Error(format("unknown derivation `%1%'") % *i);
else
selectedDrvs[j->first] = j->second;
selectedDrvs[j->second] = availDrvs[j->second];
}
/* Add in the already installed derivations. */
DrvInfos installedDrvs;
queryInstalled(state, installedDrvs);
selectedDrvs.insert(installedDrvs.begin(), installedDrvs.end());
/* Get the environment builder expression. */
Expr envBuilder = parseExprFromFile("/home/eelco/nix/corepkgs/buildenv"); /* !!! */
@ -168,14 +236,14 @@ void installDerivations(EvalState & state,
/* Switch the current user environment to the output path. */
debug(format("switching to new user environment"));
Path linkPath = createLink(topLevelDrv.outPath, topLevelDrv.drvPath);
// switchLink(current"), link);
switchLink(getLinksDir() + "/current", linkPath);
}
static void opInstall(EvalState & state,
Strings opFlags, Strings opArgs)
{
if (opArgs.size() < 1) throw UsageError("Nix expression expected");
if (opArgs.size() < 1) throw UsageError("Nix file expected");
Path nePath = opArgs.front();
opArgs.pop_front();
@ -188,12 +256,14 @@ static void opInstall(EvalState & state,
static void opQuery(EvalState & state,
Strings opFlags, Strings opArgs)
{
enum { qName } query = qName;
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);
@ -204,9 +274,11 @@ static void opQuery(EvalState & state,
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);
@ -216,16 +288,36 @@ static void opQuery(EvalState & state,
default: abort();
}
if (opArgs.size() != 0) throw UsageError("no arguments expected");
/* Perform the specified query on the derivations. */
switch (query) {
case qName: {
if (opArgs.size() != 0) throw UsageError("no arguments expected");
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();
}
}