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Author SHA1 Message Date
Eelco Dolstra
bac8055652
nix ls-{store,nar}: Add --json flag 2017-11-14 14:23:53 +01:00
Eelco Dolstra
5ef5d70b5e
Make config options available to legacy commands 2017-11-14 14:04:09 +01:00
Eelco Dolstra
3460e4cf00
More progress indicator improvements 
In particular, don't show superfluous "fetching path" and "building
path(s)" messages, and show the current round (with --repeat).
 2017-10-24 15:32:38 +02:00
Eelco Dolstra
be220702a7
Progress indicator: Show on what machine we're building 
E.g.

  $ nix build nixpkgs.hello --builders 'root@wendy'
  [1/0/1 built] building hello-2.10 on ssh://root@wendy: checking for minix/config.h... no
 2017-10-24 14:24:57 +02:00
Eelco Dolstra
0d59f1ca49
nix: Respect -I, --arg, --argstr 
Also, random cleanup to argument handling.
 2017-10-24 12:58:34 +02:00
Eelco Dolstra
f32cdc4fab
Turn $NIX_REMOTE into a configuration option 2017-10-23 20:50:28 +02:00
Eelco Dolstra
f3e0d46821
nix run: Restore signals 
Otherwise Ctrl-C doesn't work.
 2017-09-28 17:58:59 +02:00
Eelco Dolstra
5421ad243e
nix copy: make recursive by default 2017-09-27 18:28:54 +02:00
Eelco Dolstra
b8875213dc
Tweak message 2017-09-27 13:21:25 +02:00
Eelco Dolstra
bfef3ec855 nix build: Fix realising a store path 2017-09-27 13:14:45 +02:00
Eelco Dolstra
d1c6e0fe8c
nix why-depends: Write to stdout 2017-09-25 16:59:16 +02:00
Eelco Dolstra
e8d6ee7c1b
Add "nix show-derivation" 
This debug command prints a store derivation in JSON format. For
example:

  $ nix show-derivation nixpkgs.hello
  {
    "/nix/store/ayjwpwwiyy04nh9z71rsdgd3q7bra7ch-hello-2.10.drv": {
      "outputs": {
        "out": {
          "path": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10"
        }
      },
      "inputSrcs": [
        "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
      ],
      "inputDrvs": {
        "/nix/store/13839aqdf6x4k3b785rw5f2l7857l6y3-bash-4.4-p12.drv": [
          "out"
        ],
        "/nix/store/vgdx7fdc7d4iirmnwj2py1nrvr5qwzj7-hello-2.10.tar.gz.drv": [
          "out"
        ],
        "/nix/store/x3kkd0vsqfflbvwf1055l9mr39bg0ms0-stdenv.drv": [
          "out"
        ]
      },
      "platform": "x86_64-linux",
      "builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
      "args": [
        "-e",
        "/nix/store/9krlzvny65gdc8s7kpb6lkx8cd02c25b-default-builder.sh"
      ],
      "env": {
        "buildInputs": "",
        "builder": "/nix/store/qp5fw57d38bd1n07ss4zxh88zg67c3vg-bash-4.4-p12/bin/bash",
        "configureFlags": "",
        "doCheck": "1",
        "name": "hello-2.10",
        "nativeBuildInputs": "",
        "out": "/nix/store/w5w4v29ql0qwqhczkdxs94ix2lh7ibgs-hello-2.10",
        "propagatedBuildInputs": "",
        "propagatedNativeBuildInputs": "",
        "src": "/nix/store/3x7dwzq014bblazs7kq20p9hyzz0qh8g-hello-2.10.tar.gz",
        "stdenv": "/nix/store/6zngq1rdh0ans9qyckqimqibgnlvlfrm-stdenv",
        "system": "x86_64-linux"
      }
    }
  }

This removes the need for pp-aterm.
 2017-09-25 13:43:35 +02:00
Eelco Dolstra
970366266b
Add "nix add-to-store" command 2017-09-14 13:29:33 +02:00
Eelco Dolstra
1c58ad2ffa
nix why-depends: Fix showing self-references 2017-09-14 11:17:32 +02:00
Eelco Dolstra
fc0ded3408
nix why-depends: Add option to show all edges causing a dependency 
For example, without --all:

  $ nix why-depends nixpkgs.nixUnstable nixpkgs.libssh2
  /nix/store/s9n5gvj2l49b4n19nz6xl832654nf7n7-nix-1.12pre5511_c94f3d55
  └───lib/libnixstore.so: …/lib:/nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0/lib…
      => /nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0
      └───lib/libcurl.la: …ib -L/nix/store/4mbayl1y5hpjbjzkx8ndyhkv98kqw1wi-libssh2-1.8.0/l…
          => /nix/store/4mbayl1y5hpjbjzkx8ndyhkv98kqw1wi-libssh2-1.8.0

but with --all:

  $ nix why-depends -a nixpkgs.nixUnstable nixpkgs.libssh2
  /nix/store/s9n5gvj2l49b4n19nz6xl832654nf7n7-nix-1.12pre5511_c94f3d55
  ├───lib/libnixstore.so: …/lib:/nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0/lib…
  │   => /nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0
  │   └───lib/libcurl.la: …ib -L/nix/store/4mbayl1y5hpjbjzkx8ndyhkv98kqw1wi-libssh2-1.8.0/l…
  │       lib/libcurl.so.4.4.0: …/lib:/nix/store/4mbayl1y5hpjbjzkx8ndyhkv98kqw1wi-libssh2-1.8.0/l…
  │       => /nix/store/4mbayl1y5hpjbjzkx8ndyhkv98kqw1wi-libssh2-1.8.0
  └───lib/libnixstore.so: …/lib:/nix/store/bx2i9vi76lps6w9rr73fxf6my31s4dg5-aws-sdk-cpp-1.0…
      => /nix/store/bx2i9vi76lps6w9rr73fxf6my31s4dg5-aws-sdk-cpp-1.0.153
      └───lib/libaws-cpp-sdk-core.so: …e.so./nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0/lib…
          lib/libaws-cpp-sdk-s3.so: …/lib:/nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0/lib…
          => /nix/store/w9ykqpl5v0r3vfwsgn408jqhs72cx96x-curl-7.55.0
 2017-09-11 16:21:27 +02:00
Eelco Dolstra
d41c5eb13f Add command "nix why-depends" 
This command shows why a package has another package in its runtime
closure. For example, to see why VLC has libdrm.dev in its closure:

  $ nix why-depends nixpkgs.vlc nixpkgs.libdrm.dev
  /nix/store/g901z9pcj0n5yy5n6ykxk3qm4ina1d6z-vlc-2.2.5.1:
    lib/libvlccore.so.8.0.0: …nfig:/nix/store/405lmx6jl8lp0ad1vrr6j498chrqhz8g-libdrm-2.4.75-d…

  /nix/store/s3nm7kd8hlcg0facn2q1ff2n7wrwdi2l-mesa-noglu-17.0.7-dev:
    nix-support/propagated-native-build-inputs: …-dev /nix/store/405lmx6jl8lp0ad1vrr6j498chrqhz8g-libdrm-2.4.75-d…

Thus, VLC's lib/libvlccore.so.8.0.0 as well as mesa-noglu's
nix-support/propagated-native-build-inputs cause the dependency.
 2017-09-10 22:40:33 +02:00
Eelco Dolstra
8af704eef1 Typo 2017-09-10 22:40:33 +02:00
Eelco Dolstra
ad228d84e5 nix build: Only download the requested derivation outputs 
Also some refactoring.
 2017-09-10 22:40:33 +02:00
Eelco Dolstra
e02edb1483
nix copy: Add --substitute flag 2017-09-08 15:32:07 +02:00
Eelco Dolstra
3cf1705583
nix copy: Don't open the --from store twice 2017-09-08 14:46:55 +02:00
Eelco Dolstra
a2740c9ca2 nix copy: Add examples 2017-09-08 11:33:46 +02:00
Eelco Dolstra
24e23a1a73 nix search: Add examples 2017-09-07 20:42:11 +02:00
Eelco Dolstra
4967f0509a nix eval: Add examples 2017-09-07 20:37:46 +02:00
Eelco Dolstra
2ebeffcfd4 nix log: Add examples 2017-09-07 20:18:29 +02:00
Eelco Dolstra
17afc42895 nix build: Add examples 2017-09-07 20:14:04 +02:00
Eelco Dolstra
2e9b7c4cb2 nix run: Add some examples 2017-09-07 20:09:04 +02:00
Eelco Dolstra
dff440aab3
nix build: Add --out-link and --no-link options 2017-09-06 16:20:34 +02:00
Eelco Dolstra
df4342bc17
nix build: Create result symlinks 2017-09-06 16:03:22 +02:00
Eelco Dolstra
7a108d904e
Fix verbosity level for nix build --dry-run 2017-09-01 12:37:09 +02:00
Eelco Dolstra
fd73c1e20a
Add an activity for binary cache queries 2017-08-31 15:25:58 +02:00
Eelco Dolstra
7d4a7136db
More macOS build fixes 2017-08-31 12:52:07 +02:00
Eelco Dolstra
fabde432dc
Fix build failure on non-Linux 
https://hydra.nixos.org/build/59649086
 2017-08-31 11:05:18 +02:00
Eelco Dolstra
e9c07a3b26
nix edit / log: Operate on a single Installable 2017-08-29 16:18:00 +02:00
Eelco Dolstra
9b82ecbae0
nix search: Warn about cached results 2017-08-29 15:22:05 +02:00
Eelco Dolstra
c8235c5313
nix run: Flush the progress bar before starting the command 2017-08-29 15:13:30 +02:00
Eelco Dolstra
05d68a6e23
nix run: Add some flags for clearing/keeping the environment 
This is useful for testing commands in isolation.

For example,

  $ nix run nixpkgs.geeqie -i -k DISPLAY -k XAUTHORITY -c geeqie

runs geeqie in an empty environment, except for $DISPLAY and
$XAUTHORITY.
 2017-08-29 15:00:08 +02:00
Eelco Dolstra
5cc8609e30
nix run: Allow passing a command to execute 
E.g.

  nix run nixpkgs.hello -c hello --greeting Hallo

Note that unlike "nix-shell --command", no quoting of arguments is
necessary.

"-c" (short for "--command") cannot be combined with "--" because they
both consume all remaining arguments. But since installables shouldn't
start with a dash, this is unlikely to cause problems.
 2017-08-29 14:42:48 +02:00
Eelco Dolstra
93a5ef0516
nix run: Fix chroot execution 
Running "nix run" with a diverted store, e.g.

  $ nix run --store local?root=/tmp/nix nixpkgs.hello

stopped working when Nix became multithreaded, because
unshare(CLONE_NEWUSER) doesn't work in multithreaded processes. The
obvious solution is to terminate all other threads first, but 1) there
is no way to terminate Boehm GC marker threads; and 2) it appears that
the kernel has a race where unshare(CLONE_NEWUSER) will still fail for
some indeterminate amount of time after joining other threads.

So instead, "nix run" will now exec() a single-threaded helper ("nix
__run_in_chroot") that performs the actual unshare()/chroot()/exec().
 2017-08-29 13:21:07 +02:00
Eelco Dolstra
1c58e13bee
Hide commands that don't have a description 
These are assumed to be internal.
 2017-08-29 11:52:55 +02:00
Eelco Dolstra
2cc345b95f
Give activities a verbosity level again 
And print them (separately from the progress bar) given sufficient -v
flags.
 2017-08-28 19:13:24 +02:00
Eelco Dolstra
e681b1f064
Simplify 2017-08-28 14:30:35 +02:00
Eelco Dolstra
94a0548dc4
Simplify 2017-08-25 21:26:37 +02:00
Eelco Dolstra
9b845e6936
Doh 2017-08-25 20:52:34 +02:00
Eelco Dolstra
0ac35b67b8
Allow derivations to update the build phase 
So the progress bar can show

  [1/0/1 built, 0.0 MiB DL] building hello-2.10 (configuring): checking whether pread is declared without a macro... yes
 2017-08-25 18:04:05 +02:00
Eelco Dolstra
c137c0a5eb
Allow activities to be nested 
In particular, this allows more relevant activities ("substituting X")
to supersede inferior ones ("downloading X").
 2017-08-25 17:49:40 +02:00
Eelco Dolstra
f194629f96
Fix Debian build 
https://hydra.nixos.org/build/59390148
 2017-08-25 16:11:18 +02:00
Eelco Dolstra
db1d45037c
Handle SIGWINCH 2017-08-25 15:59:03 +02:00
Eelco Dolstra
ec9e0c03c3
When truncating the progress bar, take ANSI escape sequences into account 2017-08-25 15:59:03 +02:00
Eelco Dolstra
0e9ddcc306
Restore activity metadata 
This allows the progress bar to display "building perl-5.22.3" instead
of "building /nix/store/<hash>-perl-5.22.3.drv".
 2017-08-25 15:58:35 +02:00
Eelco Dolstra
4c6a26539c
Remove debug line 2017-08-21 12:18:46 +02:00
Eelco Dolstra
c2cab20732
nix verify: Restore the progress indicator 2017-08-16 20:56:03 +02:00
Eelco Dolstra
b4ed97e3a3
nix optimise-store: Show how much space has been freed 2017-08-16 20:56:03 +02:00
Eelco Dolstra
23b8b7e096
nix optimise-store: Add 
This replaces "nix-store --optimise". Main difference is that it has a
progress indicator.
 2017-08-16 20:56:03 +02:00
Eelco Dolstra
40bffe0a43
Progress indicator: Cleanup 2017-08-16 20:56:03 +02:00
Eelco Dolstra
dff12b38f9
Progress indicator: More improvements 2017-08-16 20:56:03 +02:00
Eelco Dolstra
bf1f123b09
Progress indicator: Show number of active items 2017-08-16 20:56:03 +02:00
Eelco Dolstra
0e0dcf2c7e
Progress indicator: Unify "copying" and "substituting" 
They're the same thing after all.

Example:

  $ nix build --store local?root=/tmp/nix nixpkgs.firefox-unwrapped
  [0/1 built, 49/98 copied, 16.3/92.8 MiB DL, 55.8/309.2 MiB copied] downloading 'https://cache.nixos.org/nar/0pl9li1jigcj2dany47hpmn0r3r48wc4nz48v5mqhh426lgz3bz6.nar.xz'
 2017-08-16 20:56:03 +02:00
Eelco Dolstra
c36467ad2e
Improve substitution progress indicator 
E.g.

  $ nix build --store local?root=/tmp/nix nixpkgs.firefox-unwrapped
  [0/1 built, 1/97/98 fetched, 65.8/92.8 MiB DL, 203.2/309.2 MiB copied] downloading 'https://cache.nixos.org/nar/1czm9fk0svacy4h6a3fzkpafi4f7a9gml36kk8cq1igaghbspg3k.nar.xz'
 2017-08-16 20:56:02 +02:00
Eelco Dolstra
b29b6feaba
nix copy: Improve progress indicator 
It now shows the amount of data copied:

  [8/1038 copied, 160.4/1590.9 MiB copied] copying path '...'
 2017-08-16 20:56:02 +02:00
Eelco Dolstra
c5e4404580
nix copy: Revive progress bar 2017-08-16 20:56:02 +02:00
Eelco Dolstra
dffc3fe43b
nix copy: Add --no-check-sigs flag 2017-08-16 20:56:02 +02:00
Eelco Dolstra
c6184dec6c
nix repl: Support printing floating-point numbers 2017-08-09 15:17:29 +02:00
Jörg Thalheim
2fd8f8bb99 Replace Unicode quotes in user-facing strings by ASCII 
Relevant RFC: NixOS/rfcs#4

$ ag -l | xargs sed -i -e "/\"/s/’/'/g;/\"/s/‘/'/g"
 2017-07-30 12:32:45 +01:00
Eelco Dolstra
57b9505731
nix search: Add a cache 
The package list is now cached in
~/.cache/nix/package-search.json. This gives a substantial speedup to
"nix search" queries. For example (on an SSD):

First run: (no package search cache, cold page cache)

  $ time nix search blender
  Attribute name: nixpkgs.blender
  Package name: blender
  Version: 2.78c
  Description: 3D Creation/Animation/Publishing System

  real    0m6.516s

Second run: (package search cache populated)

  $ time nix search blender
  Attribute name: nixpkgs.blender
  Package name: blender
  Version: 2.78c
  Description: 3D Creation/Animation/Publishing System

  real    0m0.143s
 2017-07-26 17:29:10 +02:00
Eelco Dolstra
c94f3d5575
nix-shell: Use bashInteractive from <nixpkgs> 
This adds about 0.1s to nix-shell runtime in the case where
bashInteractive already exists.

See discussion at https://github.com/NixOS/nixpkgs/issues/27493.
 2017-07-20 13:50:25 +02:00
Eelco Dolstra
57a30e101b
nix search: Ignore top-level eval errors 
$NIX_PATH may contain elements that don't evaluate to an attrset (like
"nixos-config"), so ignore those.
 2017-07-20 13:33:13 +02:00
Eelco Dolstra
b144c4d617
nix search: Add --json flag 2017-07-20 13:33:13 +02:00
Eelco Dolstra
90825dea51
Add "nix search" command 2017-07-20 13:33:13 +02:00
Eelco Dolstra
766ad5db3b
nix path-info: Show download sizes for binary cache stores 
E.g.

  $ nix path-info --json --store https://cache.nixos.org nixpkgs.thunderbird -S
  ...
      "downloadHash": "sha256:1jlixpzi225wwa0f4xdrwrqgi47ip1qpj9p06fyxxg07sfmyi4q0",
      "downloadSize": 43047620,
      "closureDownloadSize": 84745960
    }
  ]
 2017-07-14 18:29:10 +02:00
Eelco Dolstra
fdc9da034f
Avoid a call to derivationFromPath() 
This doesn't work in read-only mode, ensuring that operations like

  nix path-info --store https://cache.nixos.org -S nixpkgs.hello

(asking for the closure size of nixpkgs.hello in cache.nixos.org) work
when nixpkgs.hello doesn't exist in the local store.
 2017-07-14 18:29:10 +02:00
Eelco Dolstra
3908d3929c
nix path-info: Don't barf on invalid paths 
Now you get

  [
    {
      "path": "/nix/store/fzvliz4j5xzvnd0w5zgw2l0ksqh578yk-bla",
      "valid": false
    }
  ]
 2017-07-14 18:29:10 +02:00
Eelco Dolstra
6438ba22af
StorePathsCommand: Don't build installables 
On second though this was annoying. E.g. "nix log nixpkgs.hello" would
build/download Hello first, even though the log can be fetched
directly from the binary cache.

May need to revisit this.
 2017-07-14 18:29:07 +02:00
Eelco Dolstra
112ff7833d
nix: Show help when no arguments are given 
Fixes #1464.
 2017-07-14 13:44:45 +02:00
Eelco Dolstra
ad8b96f1f2
Fix handling of expression installables with a / in them 2017-07-04 15:38:23 +02:00
Eelco Dolstra
c0015e87af
Support base-64 hashes 
Also simplify the Hash API.

Fixes #1437.
 2017-07-04 15:07:41 +02:00
Eelco Dolstra
186571965d
Don't show flags from config settings in "nix --help" 2017-06-07 18:41:20 +02:00
Eelco Dolstra
aa952d5f0b
nix: Add --help-config flag 2017-06-07 16:49:54 +02:00
Eelco Dolstra
b8283773bd
nix: Make all options available as flags 
Thus, instead of ‘--option <name> <value>’, you can write ‘--<name>
<value>’. So

  --option http-connections 100

becomes

  --http-connections 100

Apart from brevity, the difference is that it's not an error to set a
non-existent option via --option, but unrecognized arguments are
fatal.

Boolean options have special treatment: they're mapped to the
argument-less flags ‘--<name>’ and ‘--no-<name>’. E.g.

  --option auto-optimise-store false

becomes

  --no-auto-optimise-store
 2017-06-07 16:17:17 +02:00
Eelco Dolstra
588dad4084
Fix build failure on Debian/Ubuntu 
http://hydra.nixos.org/build/53537463
 2017-05-29 15:59:18 +02:00
Eelco Dolstra
b01d62285c
Improve progress indicator 2017-05-16 16:09:57 +02:00
Benno Fünfstück
06880d7ed8 nix ls: support '/' for the root directory 2017-05-15 10:25:55 +02:00
Eelco Dolstra
c5f23f10a8
Replace readline by linenoise 
Using linenoise avoids a license compatibility issue (#1356), is a lot
smaller and doesn't pull in ncurses.
 2017-05-10 18:37:42 +02:00
Eelco Dolstra
03ae5e6459
Add "nix edit" command 
This is a little convenience command that opens the Nix expression of
the specified package. For example,

  nix edit nixpkgs.perlPackages.Moose

opens <nixpkgs/pkgs/top-level/perl-packages.nix> in $EDITOR (at the
right line number for some editors).

This requires the package to have a meta.position attribute.
 2017-05-08 18:42:30 +02:00
Eelco Dolstra
2da6a42448
nix dump-path: Add 
This is primarily useful for extracting NARs from other stores (like
binary caches), which "nix-store --dump" cannot do.
 2017-05-04 14:21:22 +02:00
Eelco Dolstra
782c0bff45
nix eval: Add a --raw flag 
Similar to "jq -r", this prints the evaluation result (which must be a
string value) unquoted.
 2017-05-03 14:08:18 +02:00
Eelco Dolstra
cef8c169b1
Fix "nix ... --all" 
When "--all" is used, we should not fill in a default installable.
 2017-05-02 15:46:10 +02:00
Eelco Dolstra
73bba12d8b
Check for libreadline 2017-04-28 16:53:56 +02:00
Eelco Dolstra
6734c18c99
nix repl: Fix Ctrl-C 2017-04-25 19:19:48 +02:00
Eelco Dolstra
23aa1619da
Minor cleanup 2017-04-25 19:10:47 +02:00
Eelco Dolstra
536f061765
"using namespace std" considered harmful 2017-04-25 18:58:02 +02:00
Eelco Dolstra
5bd8795e1f
nix repl: Use $XDG_DATA_HOME for the readline history 2017-04-25 18:56:29 +02:00
Eelco Dolstra
921a2aeb05
Make "nix repl" build 2017-04-25 18:48:40 +02:00
Eelco Dolstra
c31000bc93
Merge nix-repl repository 2017-04-25 18:14:13 +02:00
Eelco Dolstra
40daf0d800
Cleanup in preparation of merging nix-repl repo into nix repo 2017-04-25 18:13:23 +02:00
Eelco Dolstra
c30330df6f
StorePathCommands: Build installables 
So for instance "nix copy --to ... nixpkgs.hello" will build
nixpkgs.hello first. It's debatable whether this is a good idea. It
seems desirable for commands like "nix copy" but maybe not for
commands like "nix path-info".
 2017-04-25 16:19:22 +02:00
Eelco Dolstra
d48c973ece
Set default installable 
Thus

  $ nix build -f foo.nix

will build foo.nix.

And

  $ nix build

will build default.nix. However, this may not be a good idea because
it's kind of inconsistent, given that "nix build foo" will build the
"foo" attribute from the default installation source (i.e. the
synthesis of $NIX_PATH), rather than ./default.nix. So I may revert
this.
 2017-04-25 15:18:05 +02:00
Eelco Dolstra
0b6220fbd6
Interpret any installable containing a slash as a path 
So "nix path-info ./result" now works.
 2017-04-25 14:09:01 +02:00
Eelco Dolstra
7ee81f3887
Make StorePathsCommand a subclass of InstallablesCommand 
This allows commands like 'nix path-info', 'nix copy', 'nix verify'
etc. to work on arbitrary installables. E.g. to copy geeqie to a
binary cache:

  $ nix copy -r --to file:///tmp/binary-cache nixpkgs.geeqie

Or to get the closure size of thunderbird:

  $ nix path-info -S nixpkgs.thunderbird
 2017-04-25 13:20:26 +02:00
Eelco Dolstra
c769841bc4
Move code around 2017-04-25 12:07:31 +02:00
Eelco Dolstra
6267d74889
Add "nix eval" command 
This replaces "nix-instantiate --eval". The result is evaluated
strictly since this seems more useful.
 2017-04-25 11:23:47 +02:00