Hey folks - I'm upgrading my

pants

project and am running into an issue introduced in the 2.18.x series. I have a

_scaffolding

directory that I use to generate new projects in my monorepo. Inside this directory, there are

BUILD

files, but they're templates, so

pants

should ignore them.

_scaffolding
├── _cdk-common
│   └── Makefile
├── ecs_task
│   ├── template.toml
│   └── {{project_name}}
│       ├── BUILD
│       ├── Makefile -> ../../_cdk-common/Makefile
│       ├── README.md
│       └── src
└── generic
    ├── template.toml
    └── {{project_name}}
        ├── BUILD
        ├── Makefile -> ../../_cdk-common/Makefile
        ├── README.md
        └── src

Previously,

[GLOBAL].pants_ignore.add=["/_scaffolding/"]

seemed to do the trick to ignore these files. However, starting with Pants 2.18,

tailor

is not ignoring these files as before:

> pants \
  --changed-since=origin/main \
  tailor --check
08:39:40.80 [INFO] Initializing scheduler...
08:39:43.07 [INFO] Scheduler initialized.
08:39:43.61 [ERROR] 1 Exception encountered:

Engine traceback:
  in `tailor` goal

IntrinsicError: Unmatched globs from `--changed-since`: ["_scaffolding/ecs_task/{{project_name}}/*", "_scaffolding/generic/{{project_name}}/*"]

Do the file(s) exist? If so, check if the file(s) are in your `.gitignore` or the global `pants_ignore` option, which may result in Pants not being able to see the file(s) even though they exist on disk. Refer to <https://www.pantsbuild.org/v2.19/docs/troubleshooting#pants-cannot-find-a-file-in-your-project>.

I've tried: •

[GLOBAL].build_ignore = ["_scaffolding/*"]

•

[tailor].ignore_paths = ["_scaffolding/*"]

But I can't get past the error. Any other ideas?

What about https://www.pantsbuild.org/2.18/reference/goals/tailor#ignore_paths?

I tried that and it didn't work unfortunately

Ah, sorry. Misread your opening message.

Good thought, though! I found that when reviewing slack

Does

pants tailor ::

actually do anything or is it only a problem in check mode?

Does

pants tailor ::

actually do anything or is it only a problem in check mode?

pants \
  --changed-since=465e752909de27763465b7cfc9c8c14de4909641 \
  tailor
10:46:03.39 [ERROR] 1 Exception encountered:

Engine traceback:
  in `tailor` goal

IntrinsicError: Unmatched globs from `--changed-since`: ["_scaffolding/ecs_task/{{project_name}}/*", "_scaffolding/generic/{{project_name}}/*"]

Do the file(s) exist? If so, check if the file(s) are in your `.gitignore` or the global `pants_ignore` option, which may result in Pants not being able to see the file(s) even though they exist on disk. Refer to <https://www.pantsbuild.org/v2.19/docs/troubleshooting#pants-cannot-find-a-file-in-your-project>.

Looks like I'm hitting the error even without

--check

I'm digging through the code. I think

--changed-since

is to blame here, finding added files and asking Pants to do something with them but Pants then saying it doesn't know them.

That sounds like what I'm seeing. If I remove the

pants_ignore.add

, it starts to complain about invalid syntax in the

BUILD

file (which makes sense, since it's a template, not a real

BUILD

file)

I'm guessing if you remove the BUILD file it also works with --changed-since?

I removed the BUILD files:

delete mode 100644 _scaffolding/ecs_task/{{project_name}}/BUILD
 delete mode 100644 _scaffolding/generic/{{project_name}}/BUILD

but still get the error

pants \
  --changed-since=465e752909de27763465b7cfc9c8c14de4909641 \
  tailor
12:11:11.06 [INFO] Initializing scheduler...
12:11:13.37 [INFO] Scheduler initialized.
12:11:14.34 [ERROR] 1 Exception encountered:

Engine traceback:
  in `tailor` goal

IntrinsicError: Unmatched globs from `--changed-since`: ["_scaffolding/ecs_task/{{project_name}}/*", "_scaffolding/generic/{{project_name}}/*"]

Do the file(s) exist? If so, check if the file(s) are in your `.gitignore` or the global `pants_ignore` option, which may result in Pants not being able to see the file(s) even though they exist on disk. Refer to <https://www.pantsbuild.org/v2.19/docs/troubleshooting#pants-cannot-find-a-file-in-your-project>.

Could be yeah, I started being able to repro when adding the files.

🤔 hmm

Can you file an issue? I can fill in some details; but what is essentially happening is immensely dumb. Because your --pants-ignore removes all files in the directory, it fails to find any files in there that it could ignore. With

foobar/{foo.py,BUILD}

in my directory, it works as expected if I only ignore

foobar/foo.py

.

Yep, can do. It sounded like you had a reproducible example? (that'd save me a good deal of time)

All I've done is muck around in the Pants repo root, but sure. Fwiw, as a workaround: • Add a

DUMMY

file next to your BUILD file • After your scaffolding ignore regex, explicitly override to include the dummy file • In your build ignore, only mention the BUILD file

Cool - I'll file an issue here in a few minutes. Thanks for your help!

No worries, thanks for the patience!