tidy `triagebot.toml` `trigger_files` fails on `jj git clone` unchecked out submodules

[jieyouxu]

Summary

After jj git clone, tidy's triagebot.toml trigger_files path check can fail on paths pointing to or under unchecked out submodules as jj git clone doesn't currently create empty dirs for unchecked out submodules as jj's submodule support isn't complete yet.

Command used

$ jj git clone git@github.com:rust-lang/rust.git
$ ./x test tidy
Building bootstrap
    Finished `dev` profile [unoptimized] target(s) in 0.05s
Building stage0 tool tidy (x86_64-unknown-linux-gnu)
   Compiling tidy v0.1.0 (/home/wffl/prog/rust-r/src/tools/tidy)
    Finished `release` profile [optimized + debuginfo] target(s) in 1.81s
fmt check
fmt: checked 5937 modified files
hint: if this number seems too high, try running `git fetch origin master`
tidy check
tidy error: triagebot.toml [mentions.*] contains path 'src/tools/cargo' which doesn't exist
tidy error: triagebot.toml [mentions.*] contains path 'src/tools/enzyme' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/book' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/edition-guide' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/embedded-book' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/nomicon' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/reference' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/doc/rust-by-example' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/llvm-project' which doesn't exist
tidy error: triagebot.toml [assign.owners] contains path 'src/tools/cargo' which doesn't exist
tidy error: triagebot.toml [autolabel.F-autodiff] contains trigger_files path 'src/tools/enzyme' which doesn't exist
some tidy checks failed
Command has failed. Rerun with -v to see more details.
Build completed unsuccessfully in 0:00:05

Expected behaviour

Tidy should skip checks on paths within submodules if they are not checked out locally (but do full check in CI).

Actual behaviour

Fails locally on jj git clone.

Bootstrap configuration (bootstrap.toml)

Default

Operating system

Any

HEAD

f3344ef, or any commit after the tidy triagebot.toml trigger_files path check was introduced.

Additional context

These path checks in src/tools/tidy/src/triagebot.rs

rust/src/tools/tidy/src/triagebot.rs

Lines 24 to 30 in 58c2dd9

	if !full_path.exists() {
	tidy_error!(
	bad,
	"triagebot.toml [mentions.*] contains path '{}' which doesn't exist",
	clean_path
	);
	}

[jieyouxu]

Note: after jj git clone, git submodules update --init --recursive can still be used to ask git to create the submodules dirs which should unblock further tidy checks.

[jieyouxu]

Maybe tidy could try to simply create placeholder submodule dirs if they don't already exist, but also jj isn't a configuration that we test...

[bjorn3]

I feel like jj should be fixed to create the placeholder submodule dirs even if it doesn't have any other submodule support. It needs to handle submodule reference objects anyway. Handling them as creating the directory in question shouldn't be much harder than handling them as if the tree entry for the submodule reference doesn't exist at all.