diffing's Introduction

diffing

find strictDeps problems

point the NIXGITS env var to a directory containing a nixpkgs dir

That repo will be compared to the current dir you're in so make sure both are at the same rev

diffing ".#bash" will build bash in both repositories and then diff their outputs this is to allow you to make changes in my-nixpkgs and then run diffing again

usage

nix run "github:Artturin/diffing" ".#bash"

example of making a attrlist file

cat ./pkgs/top-level/all-packages.nix | rg "shells" | sort -hk1 | cut -f1 -d '=' | sed 's/  //' > attrlist

mass enabling strictDeps in a dependency tree

first i run

nix-diff $(nix eval --raw ".#bash.drvPath") $(nix eval --raw --expr 'with import ./. { config = { strictDepsByDefault = true; }; }; bash.drvPath' --impure)

then i pick derivations which don't already have strictDeps, for example

• The input derivation named `libffi-3.4.2` differs
  - /nix/store/0m0ijn5d1nh5mfxg5y687br7ywvqlw3b-libffi-3.4.2.drv:{dev,out}
  + /nix/store/pdab3mkc93a6llj9x3xakrx5bfv0nkm1-libffi-3.4.2.drv:{dev,out}
  • The environments do not match:
      strictDeps=1

then i put the attr in a attrlist file and run

diffing --file attrlist

and read through the whole diff and if it looks fine i enable strictDeps

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diffing's Issues

diffoscope is missing from propagatedBuildInput

It seems that diffing.py tries to call diffoscope, but it is missing from the flake. As a temporary hack, I use nix-shell -p diffoscope to then run diffing flake.

$ nix run ../diffing ".#haskellPackages.safe-exceptions"
['haskellPackages.safe-exceptions']

-----------------------diffing output doc of haskellPackages.safe-exceptions------------------------
normal: /nix/store/5lgnxcs8p182j7k98k0h1vvvix6rd7zk-safe-exceptions-0.1.7.4-doc
strict: /nix/store/nh4r7wfis09hp2kdpxbzpvlzbznnm5il-safe-exceptions-0.1.7.4-doc

Traceback (most recent call last):
  File "/nix/store/ss27janw9d2p8kpk9pq1k8v963bf6a2p-diffing/bin/diffing", line 195, in <module>
    main()
  File "/nix/store/ss27janw9d2p8kpk9pq1k8v963bf6a2p-diffing/bin/diffing", line 189, in main
    subprocess.run(
  File "/nix/store/6b1fqdwb3g56j5pazv8zkx9qd0mv3wiz-python3-3.11.9/lib/python3.11/subprocess.py", line 548, in run
    with Popen(*popenargs, **kwargs) as process:
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/6b1fqdwb3g56j5pazv8zkx9qd0mv3wiz-python3-3.11.9/lib/python3.11/subprocess.py", line 1026, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/nix/store/6b1fqdwb3g56j5pazv8zkx9qd0mv3wiz-python3-3.11.9/lib/python3.11/subprocess.py", line 1955, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: 'diffoscope'

(thanks for sharing this cool tool!)

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