OSError Errno 1 Operation not permitted when installing Scrapy in OSX 10.11 El Capitan System Integrity Protection
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Understanding the "OSError: [Errno 1] Operation not permitted" Error
When encountering the "OSError: [Errno 1] Operation not permitted" error while installing Scrapy on macOS 10.11 (El Capitan), it's essential to understand the underlying cause. This error is often related to a feature known as System Integrity Protection (SIP) introduced in El Capitan.
What is System Integrity Protection (SIP)?
System Integrity Protection (SIP), also known as "rootless," is a security technology in macOS designed to help prevent malicious software from modifying protected files and directories on your Mac. SIP operates by restricting the `root` user account and limits the actions that the root user can perform on protected parts of the Mac operating system.
The Nature of the Error
The error message "OSError: [Errno 1] Operation not permitted" typically indicates that an operation (such as writing to certain system directories) is not allowed due to SIP restrictions. When you try to install Scrapy or any other software that attempts to write to a SIP-protected area, you might encounter this error.
Why Does This Occur When Installing Scrapy?
Scrapy and many other Python packages often require compiling extensions or writing to system directories like `/usr` or `/usr/local`. Under SIP, these directories are protected:
- `/System`
- `/bin`
- `/sbin`
- `/usr` (but allows `/usr/local`)
If the installation process tries to modify these directories, SIP restrictions trigger the "Operation not permitted" error.
How to Resolve the Error
Use Virtual Environments
A common solution to avoid SIP-related issues is by using Python virtual environments. Virtual environments allow you to install Python packages in isolated directories that are user-specific rather than system-wide.
- Install Virtualenv via pip:
- Homebrew Package Manager: Use Homebrew to install Python and other dependencies in a user-accessible directory.
- Disable SIP Temporarily: As a last resort (not recommended due to security concerns), you can disable SIP, install your packages, and then re-enable SIP.
