assert_perror - Linux
Overview
assert_perror is a utility for simulating permission errors. It executes a command with certain file permissions denied, allowing users to test error-handling code and observe its behavior.
Syntax
assert_perror [options] <command> <args>
Options/Flags
- -d, –dir Deny directory permissions.
- -f, –file Deny file permissions.
- -r, –read Deny read permission.
- -w, –write Deny write permission.
- -x, –execute Deny execute permission.
- -q, –quiet Suppress non-error output.
- -p, –pattern Use a pattern to filter output.
- -h, –help Display help message.
Examples
Testing read permission:
assert_perror -r cat /etc/passwd
Testing multiple permissions with a quiet output:
assert_perror -dwqxq echo "Hello world" > /myfile
Filtering output with a pattern:
assert_perror -p 'Permission denied' echo "Hello world" > /myfile
Common Issues
- Ensure that the correct permissions are being denied.
- Verify that the specified file or directory exists.
- Use the
--quiet
option to suppress non-error output.
Integration
assert_perror can be integrated into test scripts to simulate specific error scenarios. It can also be used in conjunction with other commands for advanced error testing.
Related Commands
- perror
- test
- mock