lix/tests/flakes.sh

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source common.sh
if [[ -z $(type -p git) ]]; then
echo "Git not installed; skipping flake tests"
exit 99
fi
clearStore
rm -rf $TEST_HOME/.cache $TEST_HOME/.config
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registry=$TEST_ROOT/registry.json
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flake1Dir=$TEST_ROOT/flake1
flake2Dir=$TEST_ROOT/flake2
flake3Dir=$TEST_ROOT/flake3
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flake4Dir=$TEST_ROOT/flake4
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flake5Dir=$TEST_ROOT/flake5
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flake7Dir=$TEST_ROOT/flake7
nonFlakeDir=$TEST_ROOT/nonFlake
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for repo in $flake1Dir $flake2Dir $flake3Dir $flake7Dir $nonFlakeDir; do
rm -rf $repo $repo.tmp
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mkdir $repo
git -C $repo init
git -C $repo config user.email "foobar@example.com"
git -C $repo config user.name "Foobar"
done
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cat > $flake1Dir/flake.nix <<EOF
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{
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edition = 201909;
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description = "Bla bla";
outputs = inputs: rec {
packages.$system.foo = import ./simple.nix;
defaultPackage.$system = packages.$system.foo;
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# To test "nix flake init".
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legacyPackages.x86_64-linux.hello = import ./simple.nix;
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};
}
EOF
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cp ./simple.nix ./simple.builder.sh ./config.nix $flake1Dir/
git -C $flake1Dir add flake.nix simple.nix simple.builder.sh config.nix
git -C $flake1Dir commit -m 'Initial'
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cat > $flake2Dir/flake.nix <<EOF
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{
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edition = 201909;
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description = "Fnord";
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outputs = { self, flake1 }: rec {
packages.$system.bar = flake1.packages.$system.foo;
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};
}
EOF
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git -C $flake2Dir add flake.nix
git -C $flake2Dir commit -m 'Initial'
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cat > $flake3Dir/flake.nix <<EOF
{
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edition = 201909;
description = "Fnord";
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outputs = { self, flake2 }: rec {
packages.$system.xyzzy = flake2.packages.$system.bar;
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checks = {
xyzzy = packages.$system.xyzzy;
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};
};
}
EOF
git -C $flake3Dir add flake.nix
git -C $flake3Dir commit -m 'Initial'
cat > $nonFlakeDir/README.md <<EOF
FNORD
EOF
git -C $nonFlakeDir add README.md
git -C $nonFlakeDir commit -m 'Initial'
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cat > $registry <<EOF
{
"flakes": {
"flake:flake1": {
"url": "git+file://$flake1Dir"
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},
"flake:flake2": {
"url": "git+file://$flake2Dir"
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},
"flake:flake3": {
"url": "git+file://$flake3Dir"
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},
"flake:flake4": {
"url": "flake:flake3"
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},
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"flake:flake5": {
"url": "hg+file://$flake5Dir"
},
"flake:nixpkgs": {
"url": "flake:flake1"
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}
},
"version": 1
}
EOF
# Test 'nix flake list'.
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(( $(nix flake list --flake-registry $registry | wc -l) == 6 ))
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# Test 'nix flake info'.
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nix flake info --flake-registry $registry flake1 | grep -q 'URL: .*flake1.*'
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# Test 'nix flake info' on a local flake.
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(cd $flake1Dir && nix flake info --flake-registry $registry) | grep -q 'URL: .*flake1.*'
(cd $flake1Dir && nix flake info --flake-registry $registry .) | grep -q 'URL: .*flake1.*'
nix flake info --flake-registry $registry $flake1Dir | grep -q 'URL: .*flake1.*'
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# Test 'nix flake info --json'.
json=$(nix flake info --flake-registry $registry flake1 --json | jq .)
[[ $(echo "$json" | jq -r .description) = 'Bla bla' ]]
[[ -d $(echo "$json" | jq -r .path) ]]
[[ $(echo "$json" | jq -r .lastModified) = $(git -C $flake1Dir log -n1 --format=%ct) ]]
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# Test 'nix build' on a flake.
nix build -o $TEST_ROOT/result --flake-registry $registry flake1#foo
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[[ -e $TEST_ROOT/result/hello ]]
# Test defaultPackage.
nix build -o $TEST_ROOT/result --flake-registry $registry flake1
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[[ -e $TEST_ROOT/result/hello ]]
nix build -o $TEST_ROOT/result --flake-registry $registry $flake1Dir
nix build -o $TEST_ROOT/result --flake-registry $registry git+file://$flake1Dir
# Check that store symlinks inside a flake are not interpreted as flakes.
nix build -o $flake1Dir/result --flake-registry $registry git+file://$flake1Dir
nix path-info $flake1Dir/result
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# Building a flake with an unlocked dependency should fail in pure mode.
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(! nix build -o $TEST_ROOT/result --flake-registry $registry flake2#bar --no-registries)
(! nix eval --expr "builtins.getFlake \"$flake2Dir\"")
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# But should succeed in impure mode.
nix build -o $TEST_ROOT/result --flake-registry $registry flake2#bar --impure
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# Test automatic lock file generation.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake2Dir#bar
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[[ -e $flake2Dir/flake.lock ]]
git -C $flake2Dir add flake.lock
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git -C $flake2Dir commit flake.lock -m 'Add flake.lock'
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# Rerunning the build should not change the lockfile.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake2Dir#bar
[[ -z $(git -C $flake2Dir diff master) ]]
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# Building with a lockfile should not require a fetch of the registry.
nix build -o $TEST_ROOT/result --flake-registry file:///no-registry.json $flake2Dir#bar --tarball-ttl 0
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nix build -o $TEST_ROOT/result --no-registries $flake2Dir#bar --tarball-ttl 0
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# Updating the flake should not change the lockfile.
nix flake update --flake-registry $registry $flake2Dir
[[ -z $(git -C $flake2Dir diff master) ]]
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# Now we should be able to build the flake in pure mode.
nix build -o $TEST_ROOT/result --flake-registry $registry flake2#bar
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# Or without a registry.
# FIXME: shouldn't need '--flake-registry /no-registry'?
nix build -o $TEST_ROOT/result --flake-registry /no-registry git+file://$flake2Dir#bar --tarball-ttl 0
# Test whether indirect dependencies work.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir#xyzzy
git -C $flake3Dir add flake.lock
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# Add dependency to flake3.
rm $flake3Dir/flake.nix
cat > $flake3Dir/flake.nix <<EOF
{
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edition = 201909;
description = "Fnord";
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outputs = { self, flake1, flake2 }: rec {
packages.$system.xyzzy = flake2.packages.$system.bar;
packages.$system."sth sth" = flake1.packages.$system.foo;
};
}
EOF
git -C $flake3Dir add flake.nix
git -C $flake3Dir commit -m 'Update flake.nix'
# Check whether `nix build` works with an incomplete lockfile
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir#"sth sth"
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir#"sth%20sth"
# Check whether it saved the lockfile
(! [[ -z $(git -C $flake3Dir diff master) ]])
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git -C $flake3Dir add flake.lock
git -C $flake3Dir commit -m 'Add lockfile'
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# Unsupported editions should be an error.
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sed -i $flake3Dir/flake.nix -e s/201909/201912/
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir#sth 2>&1 | grep 'unsupported edition'
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# Test whether registry caching works.
nix flake list --flake-registry file://$registry | grep -q flake3
mv $registry $registry.tmp
nix flake list --flake-registry file://$registry --tarball-ttl 0 | grep -q flake3
mv $registry.tmp $registry
# Test whether flakes are registered as GC roots for offline use.
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# FIXME: use tarballs rather than git.
rm -rf $TEST_HOME/.cache
_NIX_FORCE_HTTP=1 nix build -o $TEST_ROOT/result --flake-registry file://$registry git+file://$flake2Dir#bar
mv $flake1Dir $flake1Dir.tmp
mv $flake2Dir $flake2Dir.tmp
nix-store --gc
_NIX_FORCE_HTTP=1 nix build -o $TEST_ROOT/result --flake-registry file://$registry git+file://$flake2Dir#bar
_NIX_FORCE_HTTP=1 nix build -o $TEST_ROOT/result --flake-registry file://$registry git+file://$flake2Dir#bar --tarball-ttl 0
mv $flake1Dir.tmp $flake1Dir
mv $flake2Dir.tmp $flake2Dir
# Add nonFlakeInputs to flake3.
rm $flake3Dir/flake.nix
cat > $flake3Dir/flake.nix <<EOF
{
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edition = 201909;
inputs = {
flake1 = {};
flake2 = {};
nonFlake = {
url = git+file://$nonFlakeDir;
flake = false;
};
};
description = "Fnord";
outputs = inputs: rec {
packages.$system.xyzzy = inputs.flake2.packages.$system.bar;
packages.$system.sth = inputs.flake1.packages.$system.foo;
packages.$system.fnord =
with import ./config.nix;
mkDerivation {
inherit system;
name = "fnord";
buildCommand = ''
cat \${inputs.nonFlake}/README.md > \$out
'';
};
};
}
EOF
cp ./config.nix $flake3Dir
git -C $flake3Dir add flake.nix config.nix
git -C $flake3Dir commit -m 'Add nonFlakeInputs'
# Check whether `nix build` works with a lockfile which is missing a
# nonFlakeInputs.
nix build -o $TEST_ROOT/result --flake-registry $registry $flake3Dir#sth
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git -C $flake3Dir add flake.lock
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git -C $flake3Dir commit -m 'Update nonFlakeInputs'
nix build -o $TEST_ROOT/result --flake-registry $registry flake3#fnord
[[ $(cat $TEST_ROOT/result) = FNORD ]]
# Check whether flake input fetching is lazy: flake3#sth does not
# depend on flake2, so this shouldn't fail.
rm -rf $TEST_HOME/.cache
clearStore
mv $flake2Dir $flake2Dir.tmp
mv $nonFlakeDir $nonFlakeDir.tmp
nix build -o $TEST_ROOT/result --flake-registry $registry flake3#sth
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake3#xyzzy)
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake3#fnord)
mv $flake2Dir.tmp $flake2Dir
mv $nonFlakeDir.tmp $nonFlakeDir
nix build -o $TEST_ROOT/result --flake-registry $registry flake3#xyzzy flake3#fnord
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# Test doing multiple `lookupFlake`s
nix build -o $TEST_ROOT/result --flake-registry $registry flake4#xyzzy
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# Test 'nix flake update' and --override-flake.
nix flake update --flake-registry $registry $flake3Dir
[[ -z $(git -C $flake3Dir diff master) ]]
nix flake update --flake-registry $registry $flake3Dir --recreate-lock-file --override-flake flake2 nixpkgs
[[ ! -z $(git -C $flake3Dir diff master) ]]
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# Make branch "removeXyzzy" where flake3 doesn't have xyzzy anymore
git -C $flake3Dir checkout -b removeXyzzy
rm $flake3Dir/flake.nix
cat > $flake3Dir/flake.nix <<EOF
{
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edition = 201909;
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inputs = {
nonFlake = {
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url = "$nonFlakeDir";
flake = false;
};
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};
description = "Fnord";
outputs = { self, flake1, flake2, nonFlake }: rec {
packages.$system.sth = flake1.packages.$system.foo;
packages.$system.fnord =
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with import ./config.nix;
mkDerivation {
inherit system;
name = "fnord";
buildCommand = ''
cat \${nonFlake}/README.md > \$out
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'';
};
};
}
EOF
git -C $flake3Dir add flake.nix
git -C $flake3Dir commit -m 'Remove packages.xyzzy'
git -C $flake3Dir checkout master
# Test whether fuzzy-matching works for IsAlias
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake4/removeXyzzy#xyzzy)
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# Test whether fuzzy-matching works for IsGit
(! nix build -o $TEST_ROOT/result --flake-registry $registry flake4/removeXyzzy#xyzzy)
nix build -o $TEST_ROOT/result --flake-registry $registry flake4/removeXyzzy#sth
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# Testing the nix CLI
nix flake add --flake-registry $registry flake1 flake3
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(( $(nix flake list --flake-registry $registry | wc -l) == 7 ))
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nix flake pin --flake-registry $registry flake1
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(( $(nix flake list --flake-registry $registry | wc -l) == 7 ))
nix flake remove --flake-registry $registry flake1
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(( $(nix flake list --flake-registry $registry | wc -l) == 6 ))
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# Test 'nix flake init'.
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(cd $flake7Dir && nix flake init)
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git -C $flake7Dir add flake.nix
nix flake --flake-registry $registry check $flake7Dir
Respect lock files of inputs + fine-grained lock file control When computing a lock file, we now respect the lock files of flake inputs. This is important for usability / reproducibility. For example, the 'nixops' flake depends on the 'nixops-aws' and 'nixops-hetzner' repositories. So when the 'nixops' flake is used in another flake, we want the versions of 'nixops-aws' and 'nixops-hetzner' locked by the the 'nixops' flake because those presumably have been tested. This can lead to a proliferation of versions of flakes like 'nixpkgs' (since every flake's lock file could depend on a different version of 'nixpkgs'). This is not a major issue when using Nixpkgs overlays or NixOS modules, since then the top-level flake composes those overlays/modules into *its* version of Nixpkgs and all other versions are ignored. Lock file computation has been made a bit more lazy so it won't try to fetch all those versions of 'nixpkgs'. However, in case it's necessary to minimize flake versions, there now are two input attributes that allow this. First, you can copy an input from another flake, as follows: inputs.nixpkgs.follows = "dwarffs/nixpkgs"; This states that the calling flake's 'nixpkgs' input shall be the same as the 'nixpkgs' input of the 'dwarffs' input. Second, you can override inputs of inputs: inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; or equivalently, using 'follows': inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.follows = "nixpkgs"; This states that the 'nixpkgs' input of the 'nixops' input shall be the same as the calling flake's 'nixpkgs' input. Finally, at '-v' Nix now prints the changes to the lock file, e.g. $ nix flake update ~/Misc/eelco-configurations/hagbard inputs of flake 'git+file:///home/eelco/Misc/eelco-configurations?subdir=hagbard' changed: updated 'nixpkgs': 'github:edolstra/nixpkgs/7845bf5f4b3013df1cf036e9c9c3a55a30331db9' -> 'github:edolstra/nixpkgs/03f3def66a104a221aac8b751eeb7075374848fd' removed 'nixops' removed 'nixops/nixops-aws' removed 'nixops/nixops-hetzner' removed 'nixops/nixpkgs'
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git -C $flake7Dir commit -m 'Initial'
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Respect lock files of inputs + fine-grained lock file control When computing a lock file, we now respect the lock files of flake inputs. This is important for usability / reproducibility. For example, the 'nixops' flake depends on the 'nixops-aws' and 'nixops-hetzner' repositories. So when the 'nixops' flake is used in another flake, we want the versions of 'nixops-aws' and 'nixops-hetzner' locked by the the 'nixops' flake because those presumably have been tested. This can lead to a proliferation of versions of flakes like 'nixpkgs' (since every flake's lock file could depend on a different version of 'nixpkgs'). This is not a major issue when using Nixpkgs overlays or NixOS modules, since then the top-level flake composes those overlays/modules into *its* version of Nixpkgs and all other versions are ignored. Lock file computation has been made a bit more lazy so it won't try to fetch all those versions of 'nixpkgs'. However, in case it's necessary to minimize flake versions, there now are two input attributes that allow this. First, you can copy an input from another flake, as follows: inputs.nixpkgs.follows = "dwarffs/nixpkgs"; This states that the calling flake's 'nixpkgs' input shall be the same as the 'nixpkgs' input of the 'dwarffs' input. Second, you can override inputs of inputs: inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; or equivalently, using 'follows': inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.follows = "nixpkgs"; This states that the 'nixpkgs' input of the 'nixops' input shall be the same as the calling flake's 'nixpkgs' input. Finally, at '-v' Nix now prints the changes to the lock file, e.g. $ nix flake update ~/Misc/eelco-configurations/hagbard inputs of flake 'git+file:///home/eelco/Misc/eelco-configurations?subdir=hagbard' changed: updated 'nixpkgs': 'github:edolstra/nixpkgs/7845bf5f4b3013df1cf036e9c9c3a55a30331db9' -> 'github:edolstra/nixpkgs/03f3def66a104a221aac8b751eeb7075374848fd' removed 'nixops' removed 'nixops/nixops-aws' removed 'nixops/nixops-hetzner' removed 'nixops/nixpkgs'
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# Test 'nix flake clone'.
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rm -rf $TEST_ROOT/flake1-v2
nix flake clone --flake-registry $registry flake1 --dest $TEST_ROOT/flake1-v2
[ -e $TEST_ROOT/flake1-v2/flake.nix ]
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# More 'nix flake check' tests.
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
overlay = final: prev: {
};
};
}
EOF
nix flake check --flake-registry $registry $flake3Dir
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
overlay = finalll: prev: {
};
};
}
EOF
(! nix flake check --flake-registry $registry $flake3Dir)
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
nixosModules.foo = {
a.b.c = 123;
foo = true;
};
};
}
EOF
nix flake check --flake-registry $registry $flake3Dir
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
nixosModules.foo = {
a.b.c = 123;
foo = assert false; true;
};
};
}
EOF
(! nix flake check --flake-registry $registry $flake3Dir)
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
nixosModule = { config, pkgs, ... }: {
a.b.c = 123;
};
};
}
EOF
nix flake check --flake-registry $registry $flake3Dir
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { flake1, self }: {
nixosModule = { config, pkgs }: {
a.b.c = 123;
};
};
}
EOF
(! nix flake check --flake-registry $registry $flake3Dir)
Respect lock files of inputs + fine-grained lock file control When computing a lock file, we now respect the lock files of flake inputs. This is important for usability / reproducibility. For example, the 'nixops' flake depends on the 'nixops-aws' and 'nixops-hetzner' repositories. So when the 'nixops' flake is used in another flake, we want the versions of 'nixops-aws' and 'nixops-hetzner' locked by the the 'nixops' flake because those presumably have been tested. This can lead to a proliferation of versions of flakes like 'nixpkgs' (since every flake's lock file could depend on a different version of 'nixpkgs'). This is not a major issue when using Nixpkgs overlays or NixOS modules, since then the top-level flake composes those overlays/modules into *its* version of Nixpkgs and all other versions are ignored. Lock file computation has been made a bit more lazy so it won't try to fetch all those versions of 'nixpkgs'. However, in case it's necessary to minimize flake versions, there now are two input attributes that allow this. First, you can copy an input from another flake, as follows: inputs.nixpkgs.follows = "dwarffs/nixpkgs"; This states that the calling flake's 'nixpkgs' input shall be the same as the 'nixpkgs' input of the 'dwarffs' input. Second, you can override inputs of inputs: inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; or equivalently, using 'follows': inputs.nixpkgs.url = github:edolstra/nixpkgs/<hash>; inputs.nixops.inputs.nixpkgs.follows = "nixpkgs"; This states that the 'nixpkgs' input of the 'nixops' input shall be the same as the calling flake's 'nixpkgs' input. Finally, at '-v' Nix now prints the changes to the lock file, e.g. $ nix flake update ~/Misc/eelco-configurations/hagbard inputs of flake 'git+file:///home/eelco/Misc/eelco-configurations?subdir=hagbard' changed: updated 'nixpkgs': 'github:edolstra/nixpkgs/7845bf5f4b3013df1cf036e9c9c3a55a30331db9' -> 'github:edolstra/nixpkgs/03f3def66a104a221aac8b751eeb7075374848fd' removed 'nixops' removed 'nixops/nixops-aws' removed 'nixops/nixops-hetzner' removed 'nixops/nixpkgs'
2020-01-24 21:05:11 +00:00
# Test 'follows' inputs.
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
inputs.foo.url = flake:flake1;
inputs.bar.follows = "foo";
outputs = { self, foo, bar }: {
};
}
EOF
nix flake update --flake-registry $registry $flake3Dir
[[ $(jq .inputs.foo.url $flake3Dir/flake.lock) = $(jq .inputs.bar.url $flake3Dir/flake.lock) ]]
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
inputs.bar.follows = "flake2/flake1";
outputs = { self, flake2, bar }: {
};
}
EOF
nix flake update --flake-registry $registry $flake3Dir
[[ $(jq .inputs.bar.url $flake3Dir/flake.lock) =~ flake1 ]]
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
inputs.bar.follows = "flake2";
outputs = { self, flake2, bar }: {
};
}
EOF
nix flake update --flake-registry $registry $flake3Dir
[[ $(jq .inputs.bar.url $flake3Dir/flake.lock) =~ flake2 ]]
# Test overriding inputs of inputs.
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
inputs.flake2.inputs.flake1.url = git+file://$flake7Dir;
outputs = { self, flake2 }: {
};
}
EOF
nix flake update --flake-registry $registry $flake3Dir
[[ $(jq .inputs.flake2.inputs.flake1.url $flake3Dir/flake.lock) =~ flake7 ]]
cat > $flake3Dir/flake.nix <<EOF
{
edition = 201909;
inputs.flake2.inputs.flake1.follows = "foo";
inputs.foo.url = git+file://$flake7Dir;
outputs = { self, flake2 }: {
};
}
EOF
nix flake update --flake-registry $registry $flake3Dir --recreate-lock-file
[[ $(jq .inputs.flake2.inputs.flake1.url $flake3Dir/flake.lock) =~ flake7 ]]
2020-01-27 12:45:49 +00:00
# Test Mercurial flakes.
if [[ -z $(type -p hg) ]]; then
echo "Git not installed; skipping Mercurial flake tests"
exit 99
fi
rm -rf $flake5Dir
hg init $flake5Dir
cat > $flake5Dir/flake.nix <<EOF
{
edition = 201909;
outputs = { self, flake1 }: {
defaultPackage.$system = flake1.defaultPackage.$system;
expr = assert builtins.pathExists ./flake.lock; 123;
};
}
EOF
hg add $flake5Dir/flake.nix
hg commit --config ui.username=foobar@example.org $flake5Dir -m 'Initial commit'
nix build -o $TEST_ROOT/result --flake-registry $registry hg+file://$flake5Dir
[[ -e $TEST_ROOT/result/hello ]]
nix flake info --flake-registry $registry --json hg+file://$flake5Dir | jq -e -r .revision
# This will fail because flake.lock is not tracked by Mercurial.
(! nix eval --flake-registry $registry hg+file://$flake5Dir#expr)
hg add $flake5Dir/flake.lock
nix eval --flake-registry $registry hg+file://$flake5Dir#expr
(! nix eval --flake-registry $registry hg+file://$flake5Dir#expr --no-allow-dirty)
(! nix flake info --flake-registry $registry --json hg+file://$flake5Dir | jq -e -r .revision)
hg commit --config ui.username=foobar@example.org $flake5Dir -m 'Add lock file'
nix flake info --flake-registry $registry --json hg+file://$flake5Dir --refresh | jq -e -r .revision
nix flake info --flake-registry $registry --json hg+file://$flake5Dir
[[ $(nix flake info --flake-registry $registry --json hg+file://$flake5Dir | jq -e -r .revCount) = 1 ]]
nix build -o $TEST_ROOT/result hg+file://$flake5Dir --no-registries --no-allow-dirty