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# ud
A clean, minimalist, robust C utility designed to automate Debian-based Linux system maintenance tasks. It manages `apt` package list updates, performs conditional upgrades, purges orphaned dependencies, clears package caches, and cleans local user thumbnail and screenshot directories while logging execution metrics.
## Features
- **Automated APT Maintenance:** Updates repository indices, checks for upgradeable packages, and runs `apt full-upgrade` only when updates exist.
- **Dependency & Cache Cleanup:** Automatically purges unused dependencies and lingering configuration files (`apt autoremove --purge`) and empties cached installer packages (`apt clean`).
- **User Cache Housekeeping:** Safely cleans desktop thumbnail caches and user screenshot directories using native POSIX directory APIs (`dirent.h`).
- **Persistent Summary Logging:** Automatically writes session timestamps and task completion metrics (item counts purged/deleted) to `~/.local/state/ud/ud.log` following XDG Base Directory standards.
- **CLI Management Flags:** Built-in option parsing (`getopt_long`) to view persistent logs, clear log files, or inspect utility version information. When `$PAGER` is unset, viewing logs streams the last 100 lines non-interactively directly to standard output.
- **High-Performance POSIX C Implementation:** Built using standard C (`-std=c11`, POSIX 2008) with zero external process forks for filesystem operations or stream formatting, alongside explicit bounds checking on formatted buffers.
- **Hardened & Optimized Build:** Compiled with `-O3`, `-flto`, `-march=native`, stack protection (`-fstack-protector-strong`), runtime buffer fortification (`-D_FORTIFY_SOURCE=2`), and strict warning checks (`-Wall -Wextra -Wpedantic -Werror`).
- **Clean Terminal Output:** Natively indents subprocess output streams in C without invoking external piping utilities.
---
## Prerequisites & Dependencies
This utility requires a **Debian-based distribution** (Debian, Ubuntu, Linux Mint, Pop!_OS, etc.) with the following installed:
- `gcc` or `clang`
- `make`
- `apt`
- `sudo` privileges for package management operations
---
## Repository Access & Cloning
Clone the repository directly from the cgit web frontend:
```bash
git clone https://git.davo.co/ud.git
```
---
## Build Instructions
To compile the executable using `make`:
```bash
# Build the utility with maximum optimization and hardening flags
make
# Install the binary to ~/.local/bin
make install
# Clean build artifacts
make clean
# Uninstall the binary from ~/.local/bin
make uninstall
```
---
## Execution Instructions
Run the utility directly from your terminal:
```bash
# Execute standard maintenance routine
ud
# View persistent maintenance log using $PAGER (defaults to less)
ud -v
ud --view-log
# Clear log history (~/.local/state/ud/ud.log)
ud -c
ud --clear-log
# Display utility version
ud -V
ud --version
# Display help message
ud -h
ud --help
```
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