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* Added a command ‘nix-store --print-env $drvpath’ that prints out the

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environment of the given derivation in a format that can be sourced
  by the shell, e.g.

  $ eval "$(nix-store --print-env $(nix-instantiate /etc/nixos/nixpkgs -A pkg))"
  $ NIX_BUILD_TOP=/tmp
  $ source $stdenv/setup

  This is especially useful to reproduce the environment used to build
  a package outside of its builder for development purposes.

  TODO: add a nix-build option to do the above and fetch the
  dependencies of the derivation as well.
This commit is contained in:
Eelco Dolstra 2012-01-17 23:07:22 +00:00
parent 2a3f4110c5
commit 4e624849b6
2 changed files with 39 additions and 0 deletions
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35
src/nix-store/nix-store.cc
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@ -382,6 +382,39 @@ static void opQuery(Strings opFlags, Strings opArgs)
}
static string shellEscape(const string & s)
{
string r;
foreach (string::const_iterator, i, s)
if (*i == '\'') r += "'\\''"; else r += *i;
return r;
}
static void opPrintEnv(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
if (opArgs.size() != 1) throw UsageError("`--print-env' requires one derivation store path");
Path drvPath = opArgs.front();
Derivation drv = derivationFromPath(*store, drvPath);
/* Print each environment variable in the derivation in a format
that can be sourced by the shell. */
foreach (StringPairs::iterator, i, drv.env)
cout << format("export %1%; %1%='%2%'\n") % i->first % shellEscape(i->second);
/* Also output the arguments. This doesn't preserve whitespace in
arguments. */
cout << "export _args; _args='";
foreach (Strings::iterator, i, drv.args) {
if (i != drv.args.begin()) cout << ' ';
cout << shellEscape(*i);
}
cout << "'\n";
}
static void opReadLog(Strings opFlags, Strings opArgs)
{
if (!opFlags.empty()) throw UsageError("unknown flag");
@ -754,6 +787,8 @@ void run(Strings args)
op = opDelete;
else if (arg == "--query" || arg == "-q")
op = opQuery;
else if (arg == "--print-env")
op = opPrintEnv;
else if (arg == "--read-log" || arg == "-l")
op = opReadLog;
else if (arg == "--dump-db")