edolstra/nix-repl

REPL for Nix

nix-repl's Issues

Segmentation fault when using tarball in NIX_PATH

$ NIX_PATH=nixpkgs=http://nixos.org/channels/nixos-16.03/nixexprs.tar.xz nix-shell -p nix-repl --run nix-repl
/run/user/499/nix-shell.ZX0UGk/rc: line 1: 15369 Segmentation fault      nix-repl

$ nix-build -A nix-repl '<nixpkgs>'
/nix/store/3f0k61j9kr5l99156m0s8ydx101yymwa-nix-repl-1.11.2-8a2f5f0

Build is broken by Nix 1.10 update

http://hydra.cryp.to/build/1140517/log/raw

--help is not implemented

$ nix-repl --help
error: unrecognised option ‘--help’
Try ‘nix-repl --help’ for more information.

This is true for nix-repl 1.8 and 1.9.

Crash on particular prompt

 ~  nix-repl    
Welcome to Nix version 1.7. Type :? for help.

nix-repl> builtins.readFile ""
error: boost::too_many_args: format-string refered to less arguments than were passed
 ~

Add command :i for installing the derivation to the current active profile

Sometimes I have noticed the need for this. What do you think?

Comment support

Now that nix-repl supports multiline expressions, I think it's a good time to add support for comments as well. So that when you copy multiline expressions that have comments, it doesn't message up the interpretation. It should be just like nix in files. With # ... \n|$ identified as a comment.

Binding new variables with dash `-` doesn't work

While let x-y = "blah"; in 1 works. Running x-y = "blah" results in:

error: syntax error, unexpected '=', expecting $end, at (string):1:5

`nix-repl` crashes with recent Nix

When using nix-repl built against nix commit 6519f06f397448c3f1677e87e385012e2507164b:

$ nix-repl '<nixpkgs>'
nix-repl: src/libexpr/eval.cc:266: nix::EvalState::EvalState(const Strings&): Assertion `gcInitialised' failed.
Aborted (core dumped)

bad input to bultins.toPath crashes nix-repl

To reproduce...

nix-repl> builtins.toPath "a"
error: boost::too_many_args: format-string refered to less arguments than were passed

Exits to shell. Seems like a harsh penalty :-)

Doesn't build with non-numeric Nix versions

I have nix 1.8pre3679_f609eec, but https://github.com/edolstra/nix-repl/blob/master/nix-repl.cc#L86 expects NIX_VERSION to be a valid literal.

Crash when faking derivation

simple like that (nix-repl-1.7-1734e8a)

nix-repl> { type = "derivation"; drvPath = "crash me please"; }
error: boost::too_many_args: format-string refered to less arguments than were passed
«derivation 

Missing man page

A man page describing what the program is all about, how it works and how to work with it would be nice to have.

show-trace doesn't work

The show-trace option is accepted, but it doesn't seem to do anything, at least there's no trace displayed.
Simple example:

$ nix-build --eval --expr "let a = z: 7 ++ 7; in a 0" --show-trace
error: while evaluating ‘a’ at (string):1:9, called from (string):1:23:
value is an integer while a list was expected, at (string):1:12

whereas

$ nix-repl --show-trace
nix-repl> let a = z: 7 ++ 7; in a 0
error: value is an integer while a list was expected, at (string):1:12

(the while evaluating ... is missing)

Nix-repl aborts on displaying the result of a __functor

See the trace below.

[maarten@maarten-laptop:~/nixpkgs]$ nix-repl 
Welcome to Nix version 1.11.2. Type :? for help.

nix-repl> builtins.tail (({ __functor = self: arg: [(self.x) arg]; x=1; }) "a")
[ "a" ]

nix-repl> builtins.head (({ __functor = self: arg: [(self.x) arg]; x=1; }) "a")
1

nix-repl> ({ __functor = self: arg: [(self.x) arg]; x=1; }) "a"
[ Aborted

Crash when tab-completing expression involving non-existent variable.

Writing `foo.‹tab›' makes the program exit due to unhandled error.
Solution:

             // Quietly ignore parse errors.
         }catch (EvalError & e) {
             // Quietly ignore evaluation errors.
+        }catch (UndefinedVarError & e) {
+            // Quietly ignore undefined variable errors.
         }
     }
 }

segfault with http:// URLs on the nix path

How to reproduce:

$ nix-env -iA nixpkgs.nix-repl
replacing old ‘nix-repl-1.8-f924081’
installing ‘nix-repl-1.10-8a2f5f0’
$ NIX_PATH="nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-15.09.tar.gz" nix-repl
Segmentation fault

Unfree license blocks me from querying an attribute

Welcome to Nix version 1.11.6. Type :? for help.

nix-repl> :l <nixpkgs>
Added 6646 variables.

nix-repl> mendeley.name
error: Package ‘mendeley-1.16.3-stable_amd64’ in ‘/nix/store/lwmgp564z0bl06svlnw21gg3qy8kw3vb-nixos-16.09.1512.6b28bd0/nixos/pkgs/applications/office/mendeley/default.nix:62’ has an unfree license (‘unfree’), refusing to evaluate.
a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnfree = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build` or any other Nix command you can add
  { allowUnfree = true; }
to ~/.nixpkgs/config.nix.

I feel that turning nixpkgs.config.allowUnfree to true just to see the name of the package is a bit much to ask. But of course, this might not be easy to fix...

I stumbled upon this issue while trying to use nix-repl to tweak my allowUnfreePredicate. Needless to say I did not get very far.

Multiline repl

The current REPL doesn't seem to support expressions over multiple lines. This would make it easier to test how Nix understands an expression that has newlines in between certain areas.

installing on nixos 14.12

Im getting the following error after following the install instructions.

~/c/nix-repl git:master ❯❯❯ nix-repl
nix-repl: src/libexpr/eval.cc:266: nix::EvalState::EvalState(const Strings&): Assertion `gcInitialised' failed.
[1] 23753 abort nix-repl

:l <nixos> doesn't load the same thing in 16.09 as it does in 16.03.

Something has changed which it appears from a conversation in #nixos would imply that we actually want to load <nixpkgs/nixos> instead in 16.09 to get the config set and related fields.

# nix-repl
Welcome to Nix version 1.11.4. Type :? for help.

nix-repl> :l <nixos>
Added 6637 variables.

nix-repl> :l <nixpkgs>
Added 6637 variables.

Feature request for a :c

Something that clears the screen.

Also I noticed that all the builtins are available as __getEnv instead of builtins.getEnv. Which one should I be using?

Fails to build against `nixUnstable`

Curious to the new floating-point support I found out that nix-repl fails to build against nixUnstable with NixOS/nixpkgs@7215118

$ nix-shell -p 'nix-repl.override{nix=nixUnstable;}'  -I nixpkgs=.
these derivations will be built:
  /nix/store/4qgb5zg3yrwa90i2fly58167bgs69qgj-nix-repl-1.12pre4911_b30d1e7-2016-02-28.drv
building path(s) ‘/nix/store/5cvngz9clyqb906pp96w4h7q2plpy7ds-nix-repl-1.12pre4911_b30d1e7-2016-02-28’
unpacking sources
unpacking source archive /nix/store/q8h2ng6wzgxsqrsczyam6szms15icg8k-nix-repl-a1ea85e92b067a0a42354a28355c633eac7be65c-src
source root is nix-repl-a1ea85e92b067a0a42354a28355c633eac7be65c-src
patching sources
configuring
no configure script, doing nothing
installing
nix-repl.cc: In constructor 'NixRepl::NixRepl(const Strings&)':
nix-repl.cc:78:44: error: no matching function for call to 'nix::EvalState::EvalState(const Strings&)'
     , staticEnv(false, &state.staticBaseEnv)
                                            ^
In file included from nix-repl.cc:10:0:
/nix/store/nx8gzz0aqk755ixmijzw8q1i0aql6qfm-nix-1.12pre4911_b30d1e7-dev/include/nix/eval.hh:103:5: note: candidate: nix::EvalState::EvalState(const Strings&, nix::ref<nix::Store>)
     EvalState(const Strings & _searchPath, ref<Store> store);
     ^
/nix/store/nx8gzz0aqk755ixmijzw8q1i0aql6qfm-nix-1.12pre4911_b30d1e7-dev/include/nix/eval.hh:103:5: note:   candidate expects 2 arguments, 1 provided
/nix/store/nx8gzz0aqk755ixmijzw8q1i0aql6qfm-nix-1.12pre4911_b30d1e7-dev/include/nix/eval.hh:63:7: note: candidate: nix::EvalState::EvalState(const nix::EvalState&)
 class EvalState
       ^
/nix/store/nx8gzz0aqk755ixmijzw8q1i0aql6qfm-nix-1.12pre4911_b30d1e7-dev/include/nix/eval.hh:63:7: note:   no known conversion for argument 1 from 'const Strings {aka const std::__cxx11::list<std::__cxx11::basic_string<char> >}' to 'const nix::EvalState&'
nix-repl.cc: In member function 'bool NixRepl::processLine(std::__cxx11::string)':
nix-repl.cc:337:31: error: 'store' was not declared in this scope
         if (drvPath == "" || !store->isValidPath(drvPath))
                               ^
nix-repl.cc: In lambda function:
nix-repl.cc:648:9: error: 'store' was not declared in this scope
         store = openStore();
         ^
builder for ‘/nix/store/4qgb5zg3yrwa90i2fly58167bgs69qgj-nix-repl-1.12pre4911_b30d1e7-2016-02-28.drv’ failed with exit code 1
error: build of ‘/nix/store/4qgb5zg3yrwa90i2fly58167bgs69qgj-nix-repl-1.12pre4911_b30d1e7-2016-02-28.drv’ failed
/run/current-system/sw/bin/nix-shell: failed to build all dependencies