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