Add support for NetBSD.

[fraggerfox]

This is the follow up to #274 introducing NetBSD support.

This pull request adds NetBSD support to the project by updating build constraints and introducing a new implementation for process listing on NetBSD. The most significant changes are:

NetBSD Support

• Added a new file widgets/proc_netbsd.go that implements the getProcs() function using NetBSD-specific ps command syntax and output parsing to retrieve process information. This includes careful handling of column widths and conversion of process data.
• Support for Temperature is sensors is currently missing in NetBSD (since I need to run it on actual h/w to check if it works). I do plan on adding support to it, once I have time to debug it.

Build Constraints

• Updated the build tag in logging/logging_dup2.go to include netbsd, ensuring the file is included in NetBSD builds.

Screenshot

Running in NetBSD 10.1.

P.S: Some of the code has been written using AI Agent assistance.

[xxxserxxx]

How are you running NetBSD? On bare metal, or in a VM? I'm going to set up a VM to verify compilation, and am curious if you have anything I can crib from for the automation.

[fraggerfox]

How are you running NetBSD? On bare metal, or in a VM? I'm going to set up a VM to verify compilation, and am curious if you have anything I can crib from for the automation.

I am running it in a vm (hence also the lack of temperature sensors implementation).

In the vm, standard go125 build -o cmd/gotop/gotop ./cmd/gotop/ should result in a binary that can execute in NetBSD.

$ file ./cmd/gotop/gotop
./cmd/gotop/gotop: ELF 64-bit LSB executable, x86-64, version 1 (NetBSD), dynamically linked, interpreter /usr/libexec/ld.elf_so, for NetBSD 7.0, BuildID[sha1]=0f437f26884e13be7f29f6569100fbdc1e51c295, with debug_info, not stripped

[fraggerfox]

How are you running NetBSD? On bare metal, or in a VM? I'm going to set up a VM to verify compilation, and am curious if you have anything I can crib from for the automation.

For automation in GHA, if you are using something like vmactions you can do something like this

  build-netbsd-latest-gcc:
      runs-on: ubuntu-22.04
      timeout-minutes: 20
      steps:
        - uses: actions/checkout@v6
          with:
            submodules: recursive
        - name: Compile
          uses: vmactions/netbsd-vm@v1
          with:
            release: '10.1'
            usesh: true
            prepare: |
              PATH="/usr/pkg/sbin:/usr/pkg/bin:$PATH"
              PKG_PATH="https://ftp.netbsd.org/pub/pkgsrc/packages/NetBSD/amd64/10.1/All/"
              export PATH PKG_PATH
              /usr/sbin/pkg_add pkgin
              pkgin -y install go125
              git config --global --add safe.directory /home/runner/work/gotop/gotop
            run: |
              set -e
              go125 build -o cmd/gotop/gotop ./cmd/gotop/

For exact implementation and prerequisites you can check how it is setup for htop / btop.

• https://github.com/htop-dev/htop/blob/main/.github/workflows/ci.yml#L298
• https://github.com/aristocratos/btop/blob/main/.github/workflows/continuous-build-netbsd.yml