semgrep

If you do not want to use default semgrep recommended rules, you can send them as arguments

Example: REPOSITORY_SEMGREP_ARGUMENTS: ["--config","p/ruleset1","p/ruleset2"]

semgrep documentation

• Visit Official Web Site
• See How to configure semgrep rules
• See How to disable semgrep rules in files
• See Index of problems detected by semgrep

Configuration in MegaLinter

• Enable semgrep by adding REPOSITORY_SEMGREP in ENABLE_LINTERS variable
• Disable semgrep by adding REPOSITORY_SEMGREP in DISABLE_LINTERS variable

Variable	Description	Default value
REPOSITORY_SEMGREP_RULESETS	List of semgrep rulesets identifiers that you want to enforce	auto
REPOSITORY_SEMGREP_RULESETS_TYPE	MegaLinter semgrep ruleset list preset id . Available values: security	``
REPOSITORY_SEMGREP_ARGUMENTS	User custom arguments to add in linter CLI call Ex: -s --foo "bar"
REPOSITORY_SEMGREP_FILE_EXTENSIONS	Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all files Ex: [".py", ""]	Exclude every file
REPOSITORY_SEMGREP_FILE_NAMES_REGEX	File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files Ex: ["Dockerfile(-.+)?", "Jenkinsfile"]	Include every file
REPOSITORY_SEMGREP_PRE_COMMANDS	List of bash commands to run before the linter	None
REPOSITORY_SEMGREP_POST_COMMANDS	List of bash commands to run after the linter	None
REPOSITORY_SEMGREP_DISABLE_ERRORS	Run linter but consider errors as warnings	false
REPOSITORY_SEMGREP_DISABLE_ERRORS_IF_LESS_THAN	Maximum number of errors allowed	0

IDE Integration

Use semgrep in your favorite IDE to catch errors before MegaLinter !

	IDE	Extension Name	Install
	Visual Studio Code	VsCode SemGrep

MegaLinter Flavours

This linter is available in the following flavours

	Flavor	Description	Embedded linters	Info
	all	Default MegaLinter Flavor	101
	documentation	MegaLinter for documentation projects	42
	dotnet	Optimized for C, C++, C# or VB based projects	50
	go	Optimized for GO based projects	44
	java	Optimized for JAVA based projects	44
	javascript	Optimized for JAVASCRIPT or TYPESCRIPT based projects	51
	php	Optimized for PHP based projects	46
	python	Optimized for PYTHON based projects	50
	ruby	Optimized for RUBY based projects	43
	rust	Optimized for RUST based projects	43
	salesforce	Optimized for Salesforce based projects	45
	security	Optimized for security	20
	swift	Optimized for SWIFT based projects	43
	terraform	Optimized for TERRAFORM based projects	48

Behind the scenes

How are identified applicable files

• If this linter is active, all files will always be linted

How the linting is performed

semgrep is called once on the whole project directory

• filtering can not be done using MegaLinter configuration variables,it must be done using semgrep configuration or ignore file (if existing)
• VALIDATE_ALL_CODEBASE: false does not make semgrep analyze only updated files

Example calls

semgrep /tmp/lint

semgrep 

Installation on mega-linter Docker image

• PIP packages (Python):
  • semgrep