“swiftlint quit unexpectedly.” as Build Tool Plugin w/ custom rules

[capnslipp]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

SwiftLint crashes (EXC_CRASH (SIGABRT)) when used as a Build Tool Plugin, with certain custom rules (see Environment).

macOS Problem Report dialog:

-------------------------------------
Translated Report (Full Report Below)
-------------------------------------

Process:               swiftlint [21508]
Path:                  /Users/USER/Library/Developer/Xcode/DerivedData/MapsGL_Prototype-cvtvxgsihvkahdfubyhlchwstanh/SourcePackages/artifacts/swiftlint/SwiftLintBinary/SwiftLintBinary.artifactbundle/swiftlint-0.53.0-macos/bin/swiftlint
Identifier:            swiftlint
Version:               ???
Code Type:             ARM-64 (Native)
Parent Process:        Xcode [2757]
Responsible:           Xcode [2757]
User ID:               501

Date/Time:             2023-10-17 13:30:23.5834 -0500
OS Version:            macOS 13.6 (22G120)
Report Version:        12
Anonymous UUID:        48F91BEB-D548-5481-807A-49062AD093F7

Sleep/Wake UUID:       70F5F817-9D02-460F-BEDC-3844C0547FF0

Time Awake Since Boot: 80000 seconds
Time Since Wake:       271 seconds

System Integrity Protection: enabled

Crashed Thread:        1

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000

Termination Reason:    Namespace SIGNAL, Code 6 Abort trap: 6
Terminating Process:   swiftlint [21508]

Application Specific Information:
abort() called


Thread 0::  Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	       0x18b8fff34 mach_msg2_trap + 8
1   libsystem_kernel.dylib        	       0x18b912260 mach_msg2_internal + 80
2   libsystem_kernel.dylib        	       0x18b908b98 mach_msg_overwrite + 604
3   libsystem_kernel.dylib        	       0x18b9002b0 mach_msg + 24
4   CoreFoundation                	       0x18ba1e774 __CFRunLoopServiceMachPort + 160
5   CoreFoundation                	       0x18ba1d054 __CFRunLoopRun + 1208
6   CoreFoundation                	       0x18ba1c448 CFRunLoopRunSpecific + 612
7   CoreFoundation                	       0x18baa152c CFRunLoopRun + 64
8   libswift_Concurrency.dylib    	       0x21911685c swift_task_asyncMainDrainQueueImpl() + 40
9   libswift_Concurrency.dylib    	       0x219116834 swift_task_asyncMainDrainQueue + 100
10  swiftlint                     	       0x10080f088 main + 84
11  dyld                          	       0x18b5e7f28 start + 2236

Thread 1 Crashed:
0   libsystem_kernel.dylib        	       0x18b908744 __pthread_kill + 8
1   libsystem_pthread.dylib       	       0x18b93fc28 pthread_kill + 288
2   libsystem_c.dylib             	       0x18b84dae8 abort + 180
3   swiftlint                     	       0x100b20968 0x100804000 + 3262824
4   swiftlint                     	       0x100b1d690 0x100804000 + 3249808
5   swiftlint                     	       0x1008431d8 0x100804000 + 258520
6   swiftlint                     	       0x10083b760 0x100804000 + 227168
7   swiftlint                     	       0x1008420f8 0x100804000 + 254200
8   swiftlint                     	       0x10081a4ed 0x100804000 + 91373
9   swiftlint                     	       0x10081a8fd 0x100804000 + 92413
10  swiftlint                     	       0x10107050d 0x100804000 + 8832269
11  swiftlint                     	       0x10080f105 0x100804000 + 45317
12  libswift_Concurrency.dylib    	       0x21911727d completeTaskAndRelease(swift::AsyncContext*, swift::SwiftError*) + 1

Thread 2:
0   libsystem_pthread.dylib       	       0x18b93ad8c start_wqthread + 0

Thread 3:
0   libsystem_pthread.dylib       	       0x18b93ad8c start_wqthread + 0


Thread 1 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000000   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0x0000000000000000
    x4: 0x0000000000000016   x5: 0x0000000000000001   x6: 0x0000000000000000   x7: 0x0000000000000403
    x8: 0x44f4eb77995de61d   x9: 0x44f4eb76f635d61d  x10: 0x0000000000000e20  x11: 0x00000000000007fb
   x12: 0x00000000af0c8862  x13: 0x00000000000007fd  x14: 0x00000000af2c9072  x15: 0x00000000af0c8862
   x16: 0x0000000000000148  x17: 0x00000001eb4ef3f8  x18: 0x0000000000000000  x19: 0x0000000000000006
   x20: 0x000000016f683000  x21: 0x0000000000000c0b  x22: 0x000000016f6830e0  x23: 0x000060000220ce20
   x24: 0x0000000000000000  x25: 0x0000000000000000  x26: 0x0000600001d0c0f0  x27: 0x0000000000000000
   x28: 0x0000000000000000   fp: 0x000000016f6825a0   lr: 0x000000018b93fc28
    sp: 0x000000016f682580   pc: 0x000000018b908744 cpsr: 0x40001000
   far: 0x00000001e6f7bff8  esr: 0x56000080  Address size fault

Binary Images:
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       0x18b8ff000 -        0x18b938fe7 libsystem_kernel.dylib (*) <1adb8ddc-762b-3b9f-a290-ca1e5ee7b419> /usr/lib/system/libsystem_kernel.dylib
       0x18b99f000 -        0x18be78fff com.apple.CoreFoundation (6.9) <77747d94-2513-3133-a53b-e032d73058d7> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
       0x2190cf000 -        0x219129ffb libswift_Concurrency.dylib (*) <6b78ae7c-22cc-3dae-b8a6-bf669887afc8> /usr/lib/swift/libswift_Concurrency.dylib
       0x18b5e2000 -        0x18b670587 dyld (*) <49204446-242b-3d1e-9704-32f8ac99723e> /usr/lib/dyld
       0x18b939000 -        0x18b945fff libsystem_pthread.dylib (*) <1f30fb9a-bdf9-32db-a709-8417666a7e45> /usr/lib/system/libsystem_pthread.dylib
       0x18b7d7000 -        0x18b855ff7 libsystem_c.dylib (*) <949943e2-52cb-3c95-ab08-7ed984333d03> /usr/lib/system/libsystem_c.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 8
    thread_create: 0
    thread_set_state: 44

VM Region Summary:
ReadOnly portion of Libraries: Total=925.9M resident=0K(0%) swapped_out_or_unallocated=925.9M(100%)
Writable regions: Total=686.0M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=686.0M(100%)

                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Activity Tracing                   256K        1 
Kernel Alloc Once                   32K        1 
MALLOC                           171.2M       17 
MALLOC guard page                   96K        5 
MALLOC_MEDIUM (reserved)         120.0M        1         reserved VM address space (unallocated)
MALLOC_NANO (reserved)           384.0M        1         reserved VM address space (unallocated)
STACK GUARD                       56.1M        4 
Stack                             9808K        4 
__AUTH                             315K       60 
__AUTH_CONST                      3741K      145 
__DATA                            4002K      141 
__DATA_CONST                      4523K      147 
__DATA_DIRTY                       361K       58 
__LINKEDIT                       804.3M        2 
__OBJC_RO                         66.4M        1 
__OBJC_RW                         2012K        1 
__TEXT                           121.6M      155 
dyld private memory                272K        2 
mapped file                       29.2M        3 
shared memory                       64K        4 
===========                     =======  ======= 
TOTAL                              1.7G      753 
TOTAL, minus reserved VM space     1.2G      753 



-----------
Full Report
-----------

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Model: Mac14,9, BootROM 10151.0.255.0.4, proc 10:6:4 processors, 32 GB, SMC 
Graphics: Apple M2 Pro, Apple M2 Pro, Built-In
Display: MacBook Pro 14", 3024 x 1964 Retina, Main, MirrorOff, Online
Memory Module: LPDDR5, Hynix
AirPort: spairport_wireless_card_type_wifi (0x14E4, 0x4388), wl0: Jun 11 2023 05:20:59 version 23.20.95.0.40.50.92 FWID 01-ec505a98
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Thunderbolt Bus: MacBook Pro, Apple Inc.

Running swiftlint lint on the CLI works displays the following warning:

warning: Cannot parse YAML file: 95:21: error: scanner: while parsing a quoted scalar in line 95, column 12
found unknown escape character:
    regex: "(?-s)(\n\s*){3,}\n(\t|    )"
                    ^ – Falling back to default configuration

but then continues on with:

Linting Swift files in current working directory
Linting 'AerisCustomLayerHost.swift' (1/98)
Linting 'MapsGL_PrototypeApp.swift' (2/98)
…
Done linting! Found 2384 violations, 53 serious in 98 files.

and does not crash.

(This is issue is not about the bad config itself; I'm aware and I'll fix it; this issue about about the plugin EXC_CRASH-ing.)

Environment

• SwiftLint version: 0.53.0 package version (also 0.53.0 for the also-installed CLI standalone version)
• Installation method used: SPM via Xcode project's Package Dependencies, and also via Package.swift (but also installed on the CLI with brew)
• Paste your configuration file:

# By default, SwiftLint uses a set of sensible default rules you can adjust:
disabled_rules: # rule identifiers turned on by default to exclude from running
  - colon
  - comment_spacing
  - empty_enum_arguments
  - identifier_name
  - opening_brace
  - private_over_fileprivate
  - redundant_optional_initialization
  - statement_position
  - trailing_whitespace
opt_in_rules: # some rules are turned off by default, so you need to opt-in
  - indentation_width
  - vertical_whitespace_closing_braces
  - vertical_whitespace_opening_braces
  - yoda_condition
  #- empty_count # find all the available rules by running: `swiftlint rules`

# Alternatively, specify all rules explicitly by uncommenting this option:
# only_rules: # delete `disabled_rules` & `opt_in_rules` if using this
#   - empty_parameters
#   - vertical_whitespace



analyzer_rules: # rules run by `swiftlint analyze`
  - explicit_self

included: # case-sensitive paths to include during linting. `--path` is ignored if present
  #- Sources
excluded: # case-sensitive paths to ignore during linting. Takes precedence over `included`
  - Carthage
  - Pods
  - Sources/ExcludedFolder
  - Sources/ExcludedFile.swift
  - Sources/*/ExcludedFile.swift # exclude files with a wildcard

# If true, SwiftLint will not fail if no lintable files are found.
allow_zero_lintable_files: false

# If true, SwiftLint will treat all warnings as errors.
strict: false


# configurable rules can be customized from this configuration file
# binary rules can set their severity level
cyclomatic_complexity:
  ignores_case_statements: true
force_cast: warning
force_try: warning
identifier_name:
  min_length:
    warning: 2
    error: 1
large_tuple:
  warning: 3
  error: 999
line_length:
  warning: 200
  error: 999
  ignores_urls: true
  ignores_comments: true
  ignores_interpolated_strings: true
switch_case_alignment:
  indented_cases: true
trailing_comma:
  mandatory_comma: true
type_name:
  min_lenth:
    warning: 2
    error: 1
  allowed_symbols: ["_"]
vertical_whitespace:
  max_empty_lines: 3

reporter: "xcode" # reporter type (xcode, json, csv, checkstyle, codeclimate, junit, html, emoji, sonarqube, markdown, github-actions-logging, summary)


custom_rules:
  stub:
    included:
      - ".*\\.swift"
    name: "Stub Violation"
    regex: "STUB"
    match_kinds:
        - comment
    message: "STUB code should be resolved"
    severity: warning
  
  # This custom rule seems to be causing the crashes— comment it out and there's no issues.
  max_double_blank_lines_in_indented_code:
    included:
      - ".*\\.swift"
    name: "Maximum of Double Blank Lines In Indented Code"
    regex: "(?-s)(\n\s*){3,}\n(\t|    )"
    message: "Maximum of Double Blank Lines In Indented Code"
    severity: warning
  
  triple_blank_lines_before_sectional_mark:
    included:
      - ".*\\.swift"
    name: "Triple Blank Lines Before Sectional Mark"
    regex: "(?<!\n\n\n)\n// MARK: -"
    match_kinds:
        - comment
    message: "`MARK -` comments should be preceded by 3 blank lines"
    severity: warning
  
  triple_blank_lines_after_imports:
    included:
      - ".*\\.swift"
    name: "Triple Blank Lines After Imports"
    regex: "(?-s)import .+\n(?!\n\n\n|\n?(@testable )?import|\n?\/\/.+\nimport)"
    message: "The last import should be followed by 3 blank lines. (Up to 1 blank line and comments are allowed between imports.)"
    severity: warning

• Are you using nested configurations? Nope
  If so, paste their relative paths and respective contents.
• Which Xcode version are you using (check xcodebuild -version)? Xcode 15.0 Build version 15A240d
• Do you have a sample that shows the issue? Crash dialog pops up as soon as you run Product > Build (⌘B) in Xcode. Shouldn't require any specific source code.

[mildm8nnered]

So this has been bothering me for a while. SwiftLint is a bit over-enthusiastic about calling its equivalent of fatalError in a few cases - maybe even just this one, and that function calls abort().

Your config will do the same on the command line - this is not Build Tool Plugin related.

% swiftlint --config /tmp/t.yml
The operation couldn’t be completed. (SwiftLintCore.Issue error 6.)
Could not read configuration: file Configuration.swift, line 236
zsh: abort      swiftlint --config /tmp/t.yml

SwiftLint/Source/SwiftLintCore/Models/Configuration.swift

Line 245 in 7d09c6b

queuedFatalError("Could not read configuration")

We should probably just exit(2) or something in this particular case.

[capnslipp]

My expectation as a user is that Xcode's build process should abort, with a single error in the Issues Navigator explaining the .swiftlint.yml formatting error (or whatever other reason SwiftLint couldn't continue).

I'm not sure if that's as simple as reporting a single error line through the normal mechanisms (a stdout line with error: …, right?) before exit()ing, or it's more involved than that.