49 lines
1.2 KiB
Markdown
49 lines
1.2 KiB
Markdown
---
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title: Writing bash scripts with Nix
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date: 2024-08-21 18:30:24
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tags: [Bash, Linux, Nix]
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---
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- Variables, such as username, can be injected.
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- `shellcheck` is run automatically with `pkgs.writeShellApplication`.
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- Packages defined in `runtimeInputs` will be automatically injected.
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<https://github.com/opdavies/dotfiles.nix/blob/a1c356a1f576f041301a5c41d6ba7d0f098d0edb/lib/shared/scripts/export-video-list.nix>
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```nix
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{ pkgs, username, ... }:
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{
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name = "export-video-list";
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runtimeInputs = with pkgs; [
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jq
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tree
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udisks
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];
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text = ''
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device_name="/dev/sda2"
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device_label="UNTITLED"
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source_path="/run/media/${username}/$device_label"
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# If the source path doesn't exist, try mounting the device.
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if [[ ! -d "$source_path" ]]; then
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${pkgs.udisks}/bin/udisksctl mount -b "$device_name"
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fi
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# Exit early if the source path still doesn't exist.
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if [[ ! -d "$source_path" ]]; then
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echo "Error: $source_path not found."
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exit 1
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fi
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output_file="$HOME/Documents/videos.json"
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${pkgs.tree}/bin/tree -J "$source_path/Videos" | ${pkgs.jq}/bin/jq . > "$output_file"
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${pkgs.jq}/bin/jq . < "$output_file"
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'';
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}
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```
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