Rename `nix show-config` to `nix config show`

Part of #7672

My main motivation is to be able to use `nix.checkConfig`[1]. This
doesn't work with Lix currently since the module uses `nix show-config`
if the Nix version is <2.20pre and `nix config show` otherwise. I think
this is the only instance where nixpkgs checks for which Nix commands
exist that affects us now, so I figured we could just perform the rename
here as well[2] and still provide the current version number[3].

I don't have a strong opinion on whether to deprecate `nix show-config`,
the warning is added there automatically.

(cherry picked from commit f300e11b056dea414d7d77bbc6e5a7dc5d9ddd41)

[1] https://nixos.org/manual/nixos/stable/options.html#opt-nix.checkConfig
[2] I should add that I don't use the "official" ways of installing Lix
    because using the flake directly and callPackaging it seemed to fit
    better into my workflow: I already have a little mess to make
    sure Hydra from the flake uses the correct pkgs.nix and I didn't
    want to complicate it further while keeping a single package-set I
    can build in CI. Don't get me wrong, I think such a module for a
    quick-start is very important, just giving context on why I bother
    in the first place :)
[3] When we go public, I think it's worth considering to add support in
    nixpkgs itself for Lix.

Change-Id: I47b4239b05cbeda3c370d2fa56ea768b768768ac

2 files changed, 10 insertions, 10 deletions

diff --git a/tests/functional/config.sh b/tests/functional/config.sh
index 723f575ed..46d606d3f 100644
--- a/tests/functional/config.sh
+++ b/tests/functional/config.sh
@@ -40,19 +40,19 @@ files=$(nix-build --verbose --version | grep "User config" | cut -d ':' -f2- | x
 # Test that it's possible to load the config from a custom location
 here=$(readlink -f "$(dirname "${BASH_SOURCE[0]}")")
 export NIX_USER_CONF_FILES=$here/config/nix-with-substituters.conf
-var=$(nix show-config | grep '^substituters =' | cut -d '=' -f 2 | xargs)
+var=$(nix config show | grep '^substituters =' | cut -d '=' -f 2 | xargs)
 [[ $var == https://example.com ]]
 
 # Test that it's possible to load config from the environment
-prev=$(nix show-config | grep '^cores' | cut -d '=' -f 2 | xargs)
+prev=$(nix config show | grep '^cores' | cut -d '=' -f 2 | xargs)
 export NIX_CONFIG="cores = 4242"$'\n'"experimental-features = nix-command flakes"
-exp_cores=$(nix show-config | grep '^cores' | cut -d '=' -f 2 | xargs)
-exp_features=$(nix show-config | grep '^experimental-features' | cut -d '=' -f 2 | xargs)
+exp_cores=$(nix config show | grep '^cores' | cut -d '=' -f 2 | xargs)
+exp_features=$(nix config show | grep '^experimental-features' | cut -d '=' -f 2 | xargs)
 [[ $prev != $exp_cores ]]
 [[ $exp_cores == "4242" ]]
 [[ $exp_features == "flakes nix-command" ]]
 
 # Test that it's possible to retrieve a single setting's value
-val=$(nix show-config | grep '^warn-dirty' | cut -d '=' -f  2 | xargs)
-val2=$(nix show-config warn-dirty)
+val=$(nix config show | grep '^warn-dirty' | cut -d '=' -f  2 | xargs)
+val2=$(nix config show warn-dirty)
 [[ $val == $val2 ]]
diff --git a/tests/functional/experimental-features.sh b/tests/functional/experimental-features.sh
index 607bf0a8e..9ee4a53d4 100644
--- a/tests/functional/experimental-features.sh
+++ b/tests/functional/experimental-features.sh
@@ -31,7 +31,7 @@ source common.sh
 NIX_CONFIG='
   experimental-features = nix-command
   accept-flake-config = true
-' nix show-config accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
+' nix config show accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
 grepQuiet "false" $TEST_ROOT/stdout
 grepQuiet "Ignoring setting 'accept-flake-config' because experimental feature 'flakes' is not enabled" $TEST_ROOT/stderr
 
@@ -39,7 +39,7 @@ grepQuiet "Ignoring setting 'accept-flake-config' because experimental feature '
 NIX_CONFIG='
   accept-flake-config = true
   experimental-features = nix-command
-' nix show-config accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
+' nix config show accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
 grepQuiet "false" $TEST_ROOT/stdout
 grepQuiet "Ignoring setting 'accept-flake-config' because experimental feature 'flakes' is not enabled" $TEST_ROOT/stderr
 
@@ -47,7 +47,7 @@ grepQuiet "Ignoring setting 'accept-flake-config' because experimental feature '
 NIX_CONFIG='
   experimental-features = nix-command flakes
   accept-flake-config = true
-' nix show-config accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
+' nix config show accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
 grepQuiet "true" $TEST_ROOT/stdout
 grepQuietInverse "Ignoring setting 'accept-flake-config'" $TEST_ROOT/stderr
 
@@ -55,7 +55,7 @@ grepQuietInverse "Ignoring setting 'accept-flake-config'" $TEST_ROOT/stderr
 NIX_CONFIG='
   accept-flake-config = true
   experimental-features = nix-command flakes
-' nix show-config accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
+' nix config show accept-flake-config 1>$TEST_ROOT/stdout 2>$TEST_ROOT/stderr
 grepQuiet "true" $TEST_ROOT/stdout
 grepQuietInverse "Ignoring setting 'accept-flake-config'" $TEST_ROOT/stderr