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* nix-env: allow ~/.nix-defexpr to be a directory. If it is, then the

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Nix expressions in that directory are combined into an attribute set
  {file1 = import file1; file2 = import file2; ...}, i.e. each Nix
  expression is an attribute with the file name as the attribute
  name.  Also recurses into directories.

* nix-env: removed the "--import" (-I) option which set the
  ~/.nix-defexpr symlink.

* nix-channel: don't use "nix-env --import", instead symlink
  ~/.nix-defexpr/channels.  So finally nix-channel --update doesn't
  override any default Nix expressions but combines with them.

  This means that you can have (say) a local Nixpkgs SVN tree and use
  it as a default for nix-env:

  $ ln -s .../path-to-nixpkgs-tree ~/.nix-defexpr/nixpkgs_svn

  and be subscribed to channels (including Nixpkgs) at the same time.
  (If there is any ambiguity, the -A flag can be used to
  disambiguate, e.g. "nix-env -i -A nixpkgs_svn.pan".)
This commit is contained in:
Eelco Dolstra 2007-09-17 16:08:24 +00:00
parent 3339f85447
commit 055608227f
6 changed files with 66 additions and 78 deletions
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68
src/nix-env/nix-env.cc
View file

@ -22,6 +22,8 @@
#include <iostream>
#include <sstream>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
@ -72,11 +74,53 @@ void printHelp()
}
static bool isNixExpr(const Path & path)
{
struct stat st;
if (stat(path.c_str(), &st) == -1)
throw SysError(format("getting information about `%1%'") % path);
return !S_ISDIR(st.st_mode) || pathExists(path + "/default.nix");
}
static void getAllExprs(EvalState & state,
const Path & path, ATermMap & attrs)
{
Strings names = readDirectory(path);
for (Strings::iterator i = names.begin(); i != names.end(); ++i) {
Path path2 = path + "/" + *i;
if (isNixExpr(path2))
attrs.set(toATerm(*i), makeAttrRHS(
parseExprFromFile(state, absPath(path2)), makeNoPos()));
else
getAllExprs(state, path2, attrs);
}
}
static Expr loadSourceExpr(EvalState & state, const Path & path)
{
if (isNixExpr(path)) return parseExprFromFile(state, absPath(path));
/* The path is a directory. Put the Nix expressions in the
directory in an attribute set, with the file name of each
expression as the attribute name. Recurse into subdirectories
(but keep the attribute set flat, not nested, to make it easier
for a user to have a ~/.nix-defexpr directory that includes
some system-wide directory). */
ATermMap attrs;
attrs.set(toATerm("_combineChannels"), makeAttrRHS(eTrue, makeNoPos()));
getAllExprs(state, path, attrs);
return makeAttrs(attrs);
}
static void loadDerivations(EvalState & state, Path nixExprPath,
string systemFilter, const ATermMap & autoArgs, DrvInfos & elems)
{
getDerivations(state,
parseExprFromFile(state, absPath(nixExprPath)), "", autoArgs, elems);
getDerivations(state, loadSourceExpr(state, nixExprPath), "", autoArgs, elems);
/* Filter out all derivations not applicable to the current
system. */
@ -365,9 +409,7 @@ static void queryInstSources(EvalState & state,
(import ./foo.nix)' = `(import ./foo.nix).bar'. */
case srcNixExprs: {
Expr e1 = parseExprFromFile(state,
absPath(instSource.nixExprPath));
Expr e1 = loadSourceExpr(state, instSource.nixExprPath);
for (Strings::const_iterator i = args.begin();
i != args.end(); ++i)
@ -429,7 +471,7 @@ static void queryInstSources(EvalState & state,
i != args.end(); ++i)
getDerivations(state,
findAlongAttrPath(state, *i, instSource.autoArgs,
parseExprFromFile(state, instSource.nixExprPath)),
loadSourceExpr(state, instSource.nixExprPath)),
"", instSource.autoArgs, elems);
break;
}
@ -1218,18 +1260,6 @@ static void opDeleteGenerations(Globals & globals,
}
static void opDefaultExpr(Globals & globals,
Strings opFlags, Strings opArgs)
{
if (opFlags.size() > 0)
throw UsageError(format("unknown flag `%1%'") % opFlags.front());
if (opArgs.size() != 1)
throw UsageError(format("exactly one argument expected"));
switchLink(getDefNixExprPath(), absPath(opArgs.front()));
}
static string needArg(Strings::iterator & i,
Strings & args, const string & arg)
{
@ -1286,8 +1316,6 @@ void run(Strings args)
op = opSet;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--import" || arg == "-I") /* !!! bad name */
op = opDefaultExpr;
else if (arg == "--profile" || arg == "-p")
globals.profile = absPath(needArg(i, args, arg));
else if (arg == "--file" || arg == "-f")