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Added utility command ‘nix-instantiate --find-file’ to look up a file in Nix's search path

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This commit is contained in:
Eelco Dolstra 2012-04-17 17:14:14 +02:00
parent 8cf1719e3e
commit 8745fade03
2 changed files with 26 additions and 0 deletions
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14
doc/manual/nix-instantiate.xml
View file

@ -36,6 +36,7 @@
<option>--eval-only</option>
<arg><option>--strict</option></arg>
</arg>
<arg choice='plain'><option>--find-file</option></arg>
</group>
<arg><option>--xml</option></arg>
</arg>
@ -100,6 +101,19 @@ policies.</para>
</varlistentry>
<varlistentry><term><option>--find-file</option></term>
<listitem><para>Look up the given files in Nix’s search path (as
specified by the <envar>NIX_PATH</envar> environment variable).
If found, print the corresponding absolute paths on standard
output. For instance, if <envar>NIX_PATH</envar> is
<literal>nixpkgs=/home/alice/nixpkgs</literal>, then
<literal>nix-instantiate --find-file nixpkgs/default.nix</literal>
will print
<literal>/home/alice/nixpkgs/default.nix</literal>.</para></listitem>
</varlistentry>
<varlistentry><term><option>--xml</option></term>
<listitem><para>When used with <option>--parse-only</option> and

12
src/nix-instantiate/nix-instantiate.cc
View file

@ -79,6 +79,7 @@ void run(Strings args)
EvalState state;
Strings files;
bool readStdin = false;
bool findFile = false;
bool evalOnly = false;
bool parseOnly = false;
bool xmlOutput = false;
@ -100,6 +101,8 @@ void run(Strings args)
readOnlyMode = true;
parseOnly = evalOnly = true;
}
else if (arg == "--find-file")
findFile = true;
else if (arg == "--attr" || arg == "-A") {
if (i == args.end())
throw UsageError("`--attr' requires an argument");
@ -130,6 +133,15 @@ void run(Strings args)
if (attrPaths.empty()) attrPaths.push_back("");
if (findFile) {
foreach (Strings::iterator, i, files) {
Path p = state.findFile(*i);
if (p == "") throw Error(format("unable to find `%1%'") % *i);
std::cout << p << std::endl;
}
return;
}
store = openStore();
if (readStdin) {