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I'm using `pass` as my password manager.
In order to use it in Firefox, I use the passff extension.
The passff extension needs the `passff-host` native messaging host to access the passwords.
Here is what the file structure of the `passff-host` package looks like:
```
result
├── etc
│ ├── chromium
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../share/passff-host/passff.json
│ ├── opt
│ │ └── chrome
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../../share/passff-host/passff.json
│ └── vivaldi
│ └── native-messaging-hosts
│ └── passff.json -> ../../../share/passff-host/passff.json
├── lib
│ ├── librewolf
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../share/passff-host/passff.json
│ └── mozilla
│ └── native-messaging-hosts
│ └── passff.json -> ../../../share/passff-host/passff.json
└── share
└── passff-host
├── passff.json
└── passff.py
```
As you can see, `lib/mozilla/native-messaging-hosts/passff.json` is a relative symlink. This is perfectly reasonable.
When adding `programs.firefox.nativeMessagingHosts = [ pkgs.passff-host ]` to the home-manager configuration, the firefox module first joins all the `nativeMessagingHosts` using `symlinkJoin` and stores the result in a variable called `nativeMessagingHostsJoined`.
This creates `ff_native-messaging-hosts` in the Nix store:
```
/nix/store/bv62k5yl7jwzkhyci838ir3vgz59gqsa-ff_native-messaging-hosts
├── bin
│ └── firefox -> /nix/store/0zqxaz44w75gjq32xj53i32jl2j91pzy-firefox-125.0.1/bin/firefox
├── etc
│ ├── chromium
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../share/passff-host/passff.json
│ ├── opt
│ │ └── chrome
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../../share/passff-host/passff.json
│ └── vivaldi
│ └── native-messaging-hosts
│ └── passff.json -> ../../../share/passff-host/passff.json
├── lib
│ ├── [...]
│ ├── librewolf
│ │ └── native-messaging-hosts
│ │ └── passff.json -> ../../../share/passff-host/passff.json
│ └── mozilla
│ ├── native-messaging-hosts
│ │ └── passff.json -> ../../../share/passff-host/passff.json
│ └── pkcs11-modules
└── share
├── [...]
└── passff-host
├── passff.json -> /nix/store/pag1akgbmls1xa63h6rzmb0h6xxwwzmy-passff-host-1.2.4/share/passff-host/passff.json
└── passff.py -> /nix/store/pag1akgbmls1xa63h6rzmb0h6xxwwzmy-passff-host-1.2.4/share/passff-host/passff.py
```
Still perfectly fine.
Then the `firefox` module sets
```nix
home.file.".mozilla/native-messaging-hosts" = {
source = "${nativeMessagingHostsJoined}/lib/mozilla/native-messaging-hosts";
recursive = true;
}
```
The `file` module then calls `lndir -silent "/nix/store/bv62k5yl7jwzkhyci838ir3vgz59gqsa-ff_native-messaging-hosts/lib/mozilla/native-messaging-hosts" ".mozilla/native-messaging-hosts"`
To see the problem, here is the resulting directory tree:
```
.mozilla
├── [...]
└── native-messaging-hosts
└── passff.json -> ../../../share/passff-host/passff.json
```
Obviously this symlink doesn't go anywhere. `lndir` created a broken symlink.
To fix this, add the `-ignorelinks` argument to `lndir`, which causes it to instead just create a symlink to the symlink in `ff_native-messaging-hosts`:
```
.mozilla
├── [...]
└── native-messaging-hosts
└── passff.json -> /nix/store/bv62k5yl7jwzkhyci838ir3vgz59gqsa-ff_native-messaging-hosts/lib/mozilla/native-messaging-hosts/passff.json
```
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| .. | ||
| accounts | ||
| config | ||
| files | ||
| i18n/input-method | ||
| launchd | ||
| lib | ||
| lib-bash | ||
| misc | ||
| po | ||
| programs | ||
| services | ||
| targets | ||
| default.nix | ||
| files.nix | ||
| home-environment.nix | ||
| manual.nix | ||
| modules.nix | ||
| systemd-activate.sh | ||
| systemd.nix | ||
| wayland.nix | ||
| xresources.nix | ||
| xsession.nix | ||