megavers 0.1.0

Analyze and prune file version history in MEGA cloud storage

megavers

Tools for analyzing and selectively pruning file version history in a MEGA cloud storage account.

Motivation

MEGA keeps full version history for every file it syncs. Over time this accumulates silently and can consume significant storage quota. This toolset lets you see exactly how much space versions are consuming and which files are the worst offenders, before deciding what to delete.

Scripts

megavers-analyze — Space analyzer

Scans your MEGA account via MEGAcmd and produces a ranked report of versioning space usage.

usage: megavers-analyze [-h] [--version] [--top N] [--json FILE] [--raw-dump FILE] [path]

positional arguments:
  path           Cloud path to analyze (default: /)

options:
  --version      Show version and exit
  --top N        Number of top files to display (default: 20)
  --json FILE    Save full results as JSON
  --raw-dump FILE  Save raw mega-ls output for debugging

The report has three ranked tables:

1. By version space — which files consume the most quota through old versions
2. By version count — which files have the most historical snapshots
3. By churn rate — which files change most frequently (versions/day), useful for spotting files that should be excluded from sync entirely

Examples:

# Analyze entire account
megavers-analyze

# Analyze a specific subfolder, show top 30, save JSON
megavers-analyze /MEGAsync/MyFolder --top 30 --json results.json

# Debug: inspect raw mega-ls output
megavers-analyze --raw-dump raw.txt

Example output:

============================================================================
MEGA VERSIONING SPACE REPORT
============================================================================
  Files with old versions:         1204
  Total old version count:         8731
  Space used by old versions:      12.7 GB
  Overhead vs. current file size:  26.3%

TOP 20 FILES BY VERSION SPACE
----------------------------------------------------------------------------
 VER SPACE   VERS    CUR SIZE  PATH
----------------------------------------------------------------------------
    3.1 GB     46    312.4 MB  /MEGAsync/Backups/project-backup.zip
                   oldest:     2023-04-12 09:15 UTC
...

TOP 20 FILES BY VERSION COUNT
----------------------------------------------------------------------------
 VERS   VER SPACE    CUR SIZE  PATH
----------------------------------------------------------------------------
  101      3.0 MB     39.0 KB  /MEGAsync/code/repo/.git/FETCH_HEAD
...

TOP 20 FILES BY CHURN RATE (versions/day)
----------------------------------------------------------------------------
  V/DAY   VERS         SINCE  PATH
----------------------------------------------------------------------------
  95.71    101  2026-07-27 10:24 UTC  /MEGAsync/code/repo/.git/FETCH_HEAD
   2.20     44  2026-07-08 12:36 UTC  /MEGAsync/code/script.py
...

"Overhead vs. current file size" is the ratio of old-version space to current-file space, computed only over files that have old versions — it does not include files with a single version.

config.toml — Filter definitions

Filters are defined in config.toml. Each filter has a name and at least one of: a list of path substrings (path_contains, case-sensitive, matching MEGA's own path semantics) or a list of extensions. If both are set, both must match (AND). Across filters, any match selects the file (OR). A filter with neither path_contains nor extensions is rejected at startup, since it would otherwise match every file in the account.

The bundled default ships with a few filters active that are broadly applicable regardless of your workflow — git internals, common OS/editor junk files (.DS_Store, Thumbs.db, desktop.ini, Vim swap files, Office lock files), and Python caches (__pycache__, .pytest_cache, .pyc/.pyo, etc.). More workflow-specific examples (like results below) are included commented out. Customize by creating your own ./config.toml or ~/.config/megavers/config.toml, or use --path-contains / --ext on the command line.

[[filter]]
name = "git"
description = "Git repository internals"
path_contains = ["/.git/"]

[[filter]]
name = "os-junk"
description = "OS-generated metadata files (macOS Finder, Windows Explorer)"
path_contains = ["/.DS_Store", "/Thumbs.db", "/desktop.ini"]

# [[filter]]
# name = "results"
# description = "Binary output files under result/sandbox directories"
# path_contains = ["/results/", "/sandbox/", "/outputs/"]
# extensions = [".pkl", ".gz", ".png", ".csv"]   # etc.

Add, remove, or modify filters freely — the tool has no hardcoded logic.

megavers-prune — Version pruner

Deletes old version histories for files matched by filters in config.toml using MEGAcmd. Only previews by default — pass --yes to actually delete. The current (latest) version of every file is always kept.

Warning: deletion is permanent. MEGA does not keep a recycle bin for pruned versions — once deleted with --yes, old versions cannot be recovered. Always run without --yes first (or with --dry-run) to review what would be deleted.

usage: megavers-prune [-h] [--from-json FILE] [--config FILE]
                         [--filter NAME] [--path-contains STR] [--ext EXT]
                         [--min-version-size SIZE] [--keep-n N] [--older-than DAYS]
                         [--yes] [--dry-run] [--list-filters] [--version] [path]

source:
  path                  Cloud path to scan (default: /)
  --from-json FILE      Load from megavers-analyze --json output (skips re-scanning)
  --config FILE         Config file path (default: ./config.toml → ~/.config/megavers/config.toml → bundled)

filters:
  --filter NAME         Activate only this config filter by name (repeatable;
                        default: all filters in config)
  --path-contains STR   Ad-hoc: select files whose path contains STR (repeatable)
  --ext EXT             Ad-hoc: select files with this extension (repeatable)
  --min-version-size SIZE  Only select files where version space >= SIZE (e.g. 10MB)

version selection (applied after filters):
  --keep-n N            Keep the N most recent old versions; delete the rest
  --older-than DAYS     Delete old versions whose age exceeds DAYS days

mode:
  --yes                 Actually delete. Without this flag, only a preview is shown.
  --dry-run             Preview what would be deleted (the default; this flag mainly
                        exists to make an already-explicit preview clearer).
  --list-filters        List filters defined in config and exit.
  --version             Show version and exit

Examples:

# Preview what would be deleted (default — nothing is deleted without --yes)
megavers-prune

# Actually delete, using all filters from config.toml
megavers-prune --yes

# Run only the 'git' filter
megavers-prune --filter git --yes

# Preview keeping only the 3 most recent old versions per matched file
megavers-prune --keep-n 3

# Delete versions older than 90 days (all filters)
megavers-prune --older-than 90 --yes

# Ad-hoc: any file whose path contains 'backup'
megavers-prune --path-contains backup --yes

# Reuse a previously saved scan
megavers-prune --from-json results.json

How MEGA versioning works

Each time a synced file is modified, MEGA stores the previous copy as a version. mega-ls -l reports the total version count in the VERS column. With the --versions flag it emits a Versions of <path>: block for each file that has old versions, starting with the current version. The analyzer treats that block header as the source of truth for the file's fully-qualified path (a directory listing alone isn't enough — scanning a single file directly produces no directory header at all), skips the first (current) entry, and explicitly sorts the rest newest-first before deleting anything, rather than trusting mega-ls's own ordering.

Old-version dates from MEGA are in UTC; megavers displays and compares them as such (--older-than cutoffs are computed in UTC too, regardless of your local timezone).

Requirements

• Python ≥ 3.11 — uses tomllib from the standard library
• MEGAcmd ≥ 2.5 — official MEGA CLI with version support

No third-party Python packages required.

Install

megavers

pip install megavers
# or, in an isolated environment:
pipx install megavers

MEGAcmd (Ubuntu / Debian)

MEGAcmd is separate from the MEGAsync desktop client and must be installed independently:

sudo apt install megacmd

If the package is not found, add the MEGA repository first:

curl -fsSL https://mega.nz/linux/repo/xUbuntu_$(lsb_release -rs)/Release.key \
  | sudo gpg --dearmor -o /usr/share/keyrings/mega-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/mega-keyring.gpg] \
  https://mega.nz/linux/repo/xUbuntu_$(lsb_release -rs)/ ./" \
  | sudo tee /etc/apt/sources.list.d/megacmd.list
sudo apt update && sudo apt install megacmd

Log in

MEGAcmd maintains its own session, independent of MEGAsync:

mega-login [e-mail]
# prompts for password interactively — do not pass the password as an argument,
# as it would be visible in shell history and process listings

Verify with:

mega-whoami