diff options
| -rw-r--r-- | doc/manual/release-notes.xml | 4 | ||||
| -rw-r--r-- | src/nix-store/nix-store.cc | 35 |
2 files changed, 39 insertions, 0 deletions
diff --git a/doc/manual/release-notes.xml b/doc/manual/release-notes.xml index 3712a8b915ac..7ef25401beaa 100644 --- a/doc/manual/release-notes.xml +++ b/doc/manual/release-notes.xml @@ -44,6 +44,10 @@ <para>TODO: <command>nix-store --verify-path</command> command.</para> </listitem> + <listitem> + <para>TODO: <command>nix-store --print-env</command> command.</para> + </listitem> + </itemizedlist> </section> diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc index b9f8d927a3a6..2e1d3f044bf5 100644 --- a/src/nix-store/nix-store.cc +++ b/src/nix-store/nix-store.cc @@ -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") |