lang: funcs: Add sys.smbios.oem_strings()

[jordansissel]

This reads the SMBIOS Type 11 data and returns a []str of the contents.

Example usage:

I booted qemu with the following flags:

• -smbios type=11,path=config.json (This includes the contents of 'config.json' as a type 11 string, neat!)
• -smbios type=11,value=this is the second one (A second type 11 entry to make sure multiple entries works)

MCL:

import "sys"
import "fmt"
for $i, $v in sys.oem_strings() {
  print [fmt.printf("string %d", $i)] { msg => $v, Meta:autogroup => false, }
}

The mgmt output:

20:12:22 engine: print[string 0]: Msg: {
  "V1": {
    "distro": {
      "Debian": {
        "release": "trixie"
      }
    },
    "variant": "Default"
  }
}
20:12:22 engine: print[string 1]: Msg: this is the second one

---

I'd like to write tests for this just to keep it safe.

Implementation details:

There may already be existing golang smbios libraries, but the data structure is pretty simple (and extremely well documented), so I felt it was best to read and decode it directly.

Reference: https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.9.0.pdf

[purpleidea]

Quick draft comment: you named it sys.smbios... you probably meant to have a subpackage, like sys/smbios if there are planning to be a lot of smbios.whatever() functions. If not then you probably want sys.smbios_whatever()

[jordansissel]

I figured it should move into a subpackage, but for the draft I was trying to save energy figuring out how to do the subpackage and get the prototype working instead

I'll move it to a subpackage and then move this to ready-to-review

[purpleidea]

You can look at the other lang/core/ dirs for sub package examples.

However we need a rough design (even if not implemented) about what else should go in there before we make it a subpackage. If we don't have more than say 3-4+ functions, let's just do sys.smbios_whatever()

[purpleidea]

Also as part of this review: keep in mind (1) on some machines that file doesn't exist and (2) we must write safe code that can never panic. Yours is a big unsafe with looking into list indexes without length checking first for example.