Ente Cli: 32-bit arm binary

[mueller-lukas]

Add 32-bit ARM Support for Ente CLI

Overview

Add support for 32-bit ARM architecture (armv7l) to enable Ente CLI usage on existing devices like Raspberry Pi, promoting hardware longevity and reducing e-waste.

Current Situation

The Ente CLI doesn't support 32-bit ARM architecture, preventing users from utilizing existing hardware like Raspberry Pi for data backup purposes.

Benefits

• Enable usage of existing 32-bit ARM devices instead of requiring new hardware purchases
• Lower power consumption compared to running backups on full desktop systems
• Support sustainable computing by extending the life of older hardware

Technical Scope

• Build and distribute armv7l compatible binary
• Ensure compatibility with common 32-bit ARM devices (e.g., Raspberry Pi prior to 2022)

[mueller-lukas]

Memory Requirements on 32-bit ARM

I attempted to cross-compile the CLI for 32-bit ARM. While compilation succeeded, execution failed with a critical memory error.

I compiled it with the environment:

export GOOS=linux
export GOARCH=arm
export GOARM=7  # ARM version v7

The Issue

As soon as I use ./ente-linux-arm account add and sign into my ente.io account, after entering the password the follwing happens:
The Argon2 key derivation attempts to allocate 1GB of memory (0x40000000 bytes) for password hashing, which exceeds the available memory on many 32-bit ARM devices like older Raspberry Pis (typically 1GB total RAM).

Error Details

fatal error: runtime: out of memory

runtime stack:
runtime.throw({0x5d4310, 0x16})
[...]
golang.org/x/crypto/argon2.IDKey(...) // Attempting to allocate 1GB

Question

Would it be possible to make the memory usage configurable or reduce it somehow?
I understand that this might lower Argon2's security, but it would make the CLI usable on low-memory devices?

Maybe someone familiar with Argon2 and this codebase can suggest a workaround. Or is this just a limitation of the CLI that's unavoidable on 32-bit devices with ~1024MB of RAM (~512 for the application)?

I totally understand if there's no official support for a 32-bit version (especially with a low memory footprint). Still, I think it could be useful for typical CLI use cases, especially on devices like older Raspberry Pis and I would appreciate any help.