Add `drill` / `ldnsutils`

[polarathene]

drill has much less dependencies linked than dig (bind9-dnsutils_bins_) or kdig (no knot-dnsutils slice). In an image approx 50MB in size already (porting attempt to chisel here) with common shared dependencies, adding dig increased image weight by 47MB, while this custom slice for drill only adds 480KB (3 files).

I have not written a custom slice before this, and the below example that I pieced together seems accurate for drill, but from what I understand the slices must be aligned to a package name which would be a bit misleading as I've excluded anything unrelated to drill.

Sharing here in case it helps someone else :)

---

ldnsutils.yaml:

package: ldnsutils

essential:
  - ldnsutils_copyright

slices:
  bins:
    essential:
      - libc6_libs
      - libldns3t64_libs
    contents:
      /usr/bin/drill:

  copyright:
    contents:
      /usr/share/doc/ldnsutils/copyright:

libldns3t64.yaml:

package: libldns3t64

essential:
  - libldns3t64_copyright

slices:
  libs:
    essential:
      - libc6_libs
      - libidn2-0_libs
      - libssl3t64_libs
    contents:
      /usr/lib/*-linux-*/libldns.so.*:

  copyright:
    contents:
      /usr/share/doc/libldns3t64/copyright:

[cjdcordeiro]

Well done on your first slice definitions @polarathene ;)

They actually look quite reasonable, so I'd encourage your to open a PR for them :)

As for the drill <pkg_slice> naming, since that are many other bins in that package, I'd actually recommend creating a slice just for drill

slices:
  drill:
    essential:
      - libc6_libs
      - libldns3t64_libs
    contents:
      /usr/bin/drill:

I'll keep this issue open in case you want to raise a PR for it ;)

[lczyk]

@polarathene just heads up in case you'd like to raise the PR yourself :) otherwise will add it as a task for team backlog ( nice SDFs btw ^_^ )

[polarathene]

Could you add it to the backlog please?

I'm unfortunately quite swamped and not sure when I'd have time to contribute a PR.

[lczyk]

no problem 👍 will message here when in progress and close when done. internal ticket number ROCKS-2380