Hey guys, I appreciate the help and have tried all of the suggestions. Unfortunately nothing is working, and it’s really worrying that such a simple task is so complicated and error prone on nixos 
The config:
nixpkgs.config.packageOverrides = pkgs: {
amuleDaemon =
let
pkgs-with-old-amule = import (builtins.fetchGit {
name = "old-amule";
url = "https://github.com/nixos/nixpkgs/";
ref = "refs/heads/nixos-unstable";
rev = "2c162d49cd5b979eb66ff1653aecaeaa01690fcc";
}) {
config = config.nixpkgs.config;
};
in
pkgs-with-old-amule.amuleDaemon;
};
Fails with:
error: attribute 'currentSystem' missing
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/pkgs/top-level/impure.nix:90:39:
89| else (if args ? localSystem then {}
90| else { system = builtins.currentSystem; }) // localSystem;
| ^
91| })
The config:
nixpkgs.config.packageOverrides = pkgs: {
amuleDaemon = pkgs.amuleDaemon.overrideAttrs (oldAttrs: {
src = pkgs.fetchFromGitHub {
owner = "amule-project";
repo = "amule";
rev = "2.3.2";
sha256 = "010wxm6g9f92x6fympj501zbnjka32rzbx0sk3a2y4zpih5d2nsn";
};
});
};
Ignores the directive and tries to get the default amule 2.3.3 instead of 2.3.2 (which is even worse than erroring out because now you have silent failure):
error: Package ‘amule-2.3.3’ in /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/pkgs/tools/networking/p2p/amule/default.nix:55 is marked as broken, refusing to evaluate.
The config:
nixpkgs.config.packageOverrides = pkgs: {
amuleDaemon =
let
pkgs-with-old-amule = import (builtins.fetchGit {
name = "old-amule";
url = "https://github.com/nixos/nixpkgs/";
ref = "refs/heads/nixos-unstable";
rev = "2c162d49cd5b979eb66ff1653aecaeaa01690fcc";
}) {
config = config.nixpkgs.config;
system = builtins.currentSystem; # Or you can set "x86_64" explicitly
# Maybe this being a container is what makes `builtins.currentSystem` undefined?
};
in
pkgs-with-old-amule.amuleDaemon;
};
Fails with:
error: attribute 'currentSystem' missing
at /nix/store/adppy720xyjlcbgmqzlbl2h75ypyb90a-source/container-mule.nix:40:24:
39| config = config.nixpkgs.config;
40| system = builtins.currentSystem; # Or you can set "x86_64" explicitly
| ^
41| # Maybe this being a container is what makes `builtins.currentSystem` undefined?
(use '--show-trace' to show detailed location information)
Switching builtins.currentSystem to "x86_64":
nixpkgs.config.packageOverrides = pkgs: {
amuleDaemon =
let
pkgs-with-old-amule = import (builtins.fetchGit {
name = "old-amule";
url = "https://github.com/nixos/nixpkgs/";
ref = "refs/heads/nixos-unstable";
rev = "2c162d49cd5b979eb66ff1653aecaeaa01690fcc";
}) {
config = config.nixpkgs.config;
system = "x86_64"; # Or you can set "x86_64" explicitly
# Maybe this being a container is what makes `builtins.currentSystem` undefined?
};
in
pkgs-with-old-amule.amuleDaemon;
};
Fails with:
error: Target specification with 1 components is ambiguous
(use '--show-trace' to show detailed location information)
Adding --show-trace gives a 1400 line trace (cut short because of the 32000 character message limit):
[root@nas:/etc/nixos]# nixos-rebuild switch --show-trace --flake .
warning: Git tree '/etc/nixos' is dirty
building the system configuration...
warning: Git tree '/etc/nixos' is dirty
error: Target specification with 1 components is ambiguous
… while evaluating the attribute '"1"'
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/parse.nix:370:5:
369| mkSkeletonFromList = l: {
370| "1" = if elemAt l 0 == "avr"
| ^
371| then { cpu = elemAt l 0; kernel = "none"; abi = "unknown"; }
… while evaluating 'mkSkeletonFromList'
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/parse.nix:369:24:
368|
369| mkSkeletonFromList = l: {
| ^
370| "1" = if elemAt l 0 == "avr"
… from call site
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/parse.nix:446:49:
445|
446| mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
| ^
447|
… while evaluating 'mkSystemFromString'
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/parse.nix:446:24:
445|
446| mkSystemFromString = s: mkSystemFromSkeleton (mkSkeletonFromList (lib.splitString "-" s));
| ^
447|
… from call site
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/default.nix:23:16:
22| # Prefer to parse `config` as it is strictly more informative.
23| parsed = parse.mkSystemFromString (if args ? config then args.config else args.system);
| ^
24| # Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
… while evaluating the attribute 'parsed.abi.assertions'
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/systems/default.nix:23:7:
22| # Prefer to parse `config` as it is strictly more informative.
23| parsed = parse.mkSystemFromString (if args ? config then args.config else args.system);
| ^
24| # Either of these can be losslessly-extracted from `parsed` iff parsing succeeds.
… while evaluating 'foldl''
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/lists.nix:82:16:
81| let
82| foldl' = n:
| ^
83| if n == -1
… from call site
at /nix/store/176g3d0sly5d602qf8wcljc15584zngz-old-amule/lib/lists.nix:86:8:
85| else op (foldl' (n - 1)) (elemAt list n);
86| in foldl' (length list - 1);
| ^
87|
SNIP
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/attrsets.nix:301:19:
300| g =
301| name: value:
| ^
302| if isAttrs value && cond value
… from call site
… while evaluating 'escapeShellArg'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/strings.nix:318:20:
317| */
318| escapeShellArg = arg: "'${replaceStrings ["'"] ["'\\''"] (toString arg)}'";
| ^
319|
… from call site
… while evaluating 'concatMapStringsSep'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/strings.nix:110:5:
109| # List of input strings
110| list: concatStringsSep sep (map f list);
| ^
111|
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/etc/etc.nix:54:43:
53| mkdir -p "$out/etc"
54| ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
| ^
55| "makeEtcEntry"
… while evaluating anonymous lambda
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/etc/etc.nix:54:33:
53| mkdir -p "$out/etc"
54| ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
| ^
55| "makeEtcEntry"
… from call site
… while evaluating 'concatMapStringsSep'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/strings.nix:110:5:
109| # List of input strings
110| list: concatStringsSep sep (map f list);
| ^
111|
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/etc/etc.nix:54:7:
53| mkdir -p "$out/etc"
54| ${concatMapStringsSep "\n" (etcEntry: escapeShellArgs [
| ^
55| "makeEtcEntry"
… while evaluating the attribute 'buildCommand' of the derivation 'etc'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let
… while evaluating the attribute 'value'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:452:44:
451| defnsByName' = byName "config" (module: value:
452| [{ inherit (module) file; inherit value; }]
| ^
453| ) configs;
… while evaluating 'dischargeProperties'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:669:25:
668| */
669| dischargeProperties = def:
| ^
670| if def._type or "" == "merge" then
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:598:137:
597| defs' = concatMap (m:
598| map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
| ^
599| ) defs;
… while evaluating definitions from `/nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/etc/etc.nix':
… while evaluating anonymous lambda
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:597:28:
596| # Process mkMerge and mkIf properties.
597| defs' = concatMap (m:
| ^
598| map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:597:17:
596| # Process mkMerge and mkIf properties.
597| defs' = concatMap (m:
| ^
598| map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
… while evaluating the attribute 'values'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:710:7:
709| in {
710| values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
| ^
711| inherit highestPrio;
… while evaluating the attribute 'values'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:611:9:
610| in {
611| values = defs''';
| ^
612| inherit (defs'') highestPrio;
… while evaluating the attribute 'mergedValue'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:617:5:
616| # Type-check the remaining definitions, and merge them. Or throw if no definitions.
617| mergedValue =
| ^
618| if isDefined then
… while evaluating the option `system.activationScripts.etc.text':
… while evaluating the attribute 'value'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:585:9:
584| in warnDeprecation opt //
585| { value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
| ^
586| inherit (res.defsFinal') highestPrio;
… while evaluating anonymous lambda
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/modules.nix:171:72:
170| # For definitions that have an associated option
171| declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
| ^
172|
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/attrsets.nix:304:20:
303| then recurse (path ++ [name]) value
304| else f (path ++ [name]) value;
| ^
305| in mapAttrs g set;
… while evaluating 'g'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/attrsets.nix:301:19:
300| g =
301| name: value:
| ^
302| if isAttrs value && cond value
… from call site
… while evaluating the attribute 'text'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/activation/activation-script.nix:9:5:
8| addAttributeName = mapAttrs (a: v: v // {
9| text = ''
| ^
10| #### Activation script snippet ${a}:
… while evaluating 'id'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/trivial.nix:14:5:
13| # The value to return
14| x: x;
| ^
15|
… from call site
… while evaluating 'textClosureMap'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/lib/strings-with-deps.nix:75:35:
74|
75| textClosureMap = f: predefined: names:
| ^
76| concatStringsSep "\n" (map f (textClosureList predefined names));
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/activation/activation-script.nix:49:9:
48|
49| ${textClosureMap id (withDrySnippets) (attrNames withDrySnippets)}
| ^
50|
… while evaluating 'systemActivationScript'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/activation/activation-script.nix:20:33:
19|
20| systemActivationScript = set: onlyDry: let
| ^
21| set' = mapAttrs (_: v: if isString v then (noDepEntry v) // { supportsDryActivation = false; } else v) set;
… from call site
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/activation/activation-script.nix:136:18:
135| apply = set: set // {
136| script = systemActivationScript set false;
| ^
137| };
… while evaluating the attribute 'system.activationScripts.script'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/nixos/modules/system/activation/activation-script.nix:136:9:
135| apply = set: set // {
136| script = systemActivationScript set false;
| ^
137| };
… while evaluating the attribute 'activationScript' of the derivation 'nixos-system-nas-21.11.20211218.2627c4b'
at /nix/store/idcl4krkhgqha859fdr1fgqgd4pda787-source/pkgs/stdenv/generic/make-derivation.nix:205:7:
204| // (lib.optionalAttrs (attrs ? name || (attrs ? pname && attrs ? version)) {
205| name =
| ^
206| let