❯ nom build .#documentation --
fetching git input 'git+file:///home/hexa/git/snm/ldap-updates'
this derivation will be built:
  /nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-documentation.drv
documentation> building '/nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-documentation.drv' on 'ssh://build@ganymede.lossy.network'
copying 0 paths
documentation> Running phase: unpackPhase
documentation> unpacking source archive /nix/store/rfaxhjylfimwd4cg2rkd8wgqlxnyfn8a-source
documentation> source root is source
documentation> Running phase: patchPhase
documentation> Running phase: updateAutotoolsGnuConfigScriptsPhase
documentation> Running phase: configurePhase
documentation> no configure script, doing nothing
documentation> Running phase: buildPhase
documentation> Running Sphinx v9.1.0
documentation> loading translations [en]... done
documentation> making output directory... done
documentation> myst v5.0.0: MdParserConfig(commonmark_only=False, gfm_only=False, enable_extensions={'linkify', 'colon_fence'}, disable_syntax=[], all_links_external=False, links_external_new_tab=False, url_schemes=('http', 'https', 'mailto', 'ftp'), ref_domains=None, fence_as_directive=set(), number_code_blocks=[], title_to_header=False, heading_anchors=0, heading_slug_func=None, html_meta={}, footnote_sort=True, footnote_transition=True, words_per_minute=200, substitutions={}, linkify_fuzzy_links=True, dmath_allow_labels=True, dmath_allow_space=True, dmath_allow_digits=True, dmath_double_inline=False, update_mathjax=True, mathjax_classes='tex2jax_process|mathjax_process|math|output_area', enable_checkboxes=False, suppress_warnings=[], highlight_code_blocks=True)
┏━ 2 Errors: 
┃ error: builder for '/nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-documentation.drv' failed on remote builder
┃ error: build of '/nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-documentation.drv' on 'ssh://build@ganymede.lossy.network' failed: builder for '/nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-d…
┃        last 25 log lines:
┃        >
┃        > Did you want to embed a URI or alias?
┃        > Closing bracket missing. [docutils]
┃        > looking for now-outdated files... none found
┃        > pickling environment... done
┃        > checking consistency... done
┃        > preparing documents... done
┃        > copying assets... 
┃        > copying static files... 
┃        > Writing evaluated template result to /build/source/_build/html/_static/documentation_options.js
┃        > Writing evaluated template result to /build/source/_build/html/_static/language_data.js
┃        > Writing evaluated template result to /build/source/_build/html/_static/basic.css
┃        > Writing evaluated template result to /build/source/_build/html/_static/js/versions.js
┃        > copying static files: done
┃        > copying extra files... 
┃        > copying extra files: done
┃        > copying assets: done
           writing output... [100%] srs9;49;00m0m[39;49;00m
┃        > generating indices... genindex done
┃        > writing additional pages... search done
           copying images... [100%] logo.png
┃        > dumping search index in English (code: en)... done
┃        > dumping object inventory... done
┃        > build finished with problems, 1 warning (with warnings treated as errors).
┃        > make: *** [Makefile:20: html] Error 1
┃        For full logs, run:
┃        	nix log /nix/store/46pk94jg1hkbyxc374rcfimd8a32q6i9-documentation.drv
┣━ Dependency Graph:
┃ ⏵ documentation on ln ⏱ 2s (∅ 3s)                           
┣━━━ Builds          │ Host                                                       
┃        │     │     │                  localhost                                 
┃    ⏵ 1 │     │     │ ln: ganymede.lossy.network (ssh)                           
┗━ ∑ ⏵ 1 │ ✔ 0 │ ⏸ 0 │ ⚠ Exited with 2 errors reported by nix at 03:30:16 after 6s

I can imagine something like

$ nom-build foo
<tmux thing>
  <nix-build foo output>
  <monitor output>

$ nom-build foo --detached
"To connect to the monitor ran <some command>"
<nix-build foo output>

$ nix-build -A pkgsStatic.haskell.packages.ghc912.th-orphans --dry-run
trace: network
trace: iserv-proxy
trace: network
trace: network
trace: network
these 49 derivations will be built:

$ nom-build -A pkgsStatic.haskell.packages.ghc912.th-orphans --dry-run
trace: network
trace: iserv-proxy
┏━ 2 Traces: 
┃ trace: network
┃ trace: iserv-proxy
┣━━━     
┗━ ∑ ⏱ 5s^C

or, if I leave it running

$ nom-build -A pkgsStatic.haskell.packages.ghc912.th-orphans --dry-run
trace: network
trace: iserv-proxy
these 49 derivations will be built: