slack-sieve

Sieve your Slack workspace export before Mattermost import — triage channels, cherry-pick messages, preview attachments.

Slack export → hydrate → review UI → manifest.json → prepare-export → mmetl → mmctl

Quick start

git clone git@git.levkin.ca:ilia/slack-sieve.git
cd slack-sieve

# Optional: download files into __uploads/ from export token URLs
export SLACK_EXPORT_DIR="$HOME/Downloads/your-slack-export"
export SLACK_HYDRATED_DIR="$HOME/Downloads/your-slack-export-enriched"
make hydrate

# Optional: pre-skip noise channels (edit presets/levkin-skips.json or add your own)
make preset-skips

# Review at http://127.0.0.1:8765
export SLACK_EXPORT_PATH="$HOME/Downloads/your-slack-export-enriched"
make review

Selections are saved to manifest.json (gitignored).

Make targets

Target	Description
make review	Start the web UI on port 8765
make hydrate	Copy export + download attachments via embedded xoxe URLs
make preset-skips	Mark preset channels as skip in manifest.json
make prepare-export	Write prepared-export/ (filtered Slack shape for mmetl)

Environment

Variable	Default
SLACK_EXPORT_PATH	~/Downloads/Levkin Slack export enriched
SLACK_EXPORT_DIR	Raw export for hydrate
SLACK_HYDRATED_DIR	Output folder for hydrate
SLACK_IMPORT_PORT	8765

UI shortcuts

• J/K — previous/next message
• Space — toggle cherry-pick
• I / S — import/skip message
• Shift+I / Shift+S — import/skip whole channel
• N — next undecided channel

Presets

Edit presets/levkin-skips.json (or copy it) for workspace-specific channels to auto-skip.

Mattermost import (after review)

1. Set optional mattermost_channel renames and user_emails in manifest.json.
2. make prepare-export — writes prepared-export/ (pytest-covered).
3. Zip that folder; mmetl transform slack --team <team> …
4. mmctl import process --bypass-upload on the Mattermost host

Levkin: import completed 2026-07-10 — see docs/HANDOFF.md for channel map and caveats.

Docs: Migrate from Slack

Requirements

• Python 3.10+ (stdlib only for server)
• Official Slack export folder or enriched copy with channels.json, users.json, channel dirs

Handoff

Levkin migration status and channel map: docs/HANDOFF.md

Remote

git@git.levkin.ca:ilia/slack-sieve.git

SSH uses LAN 10.0.10.169 via Host git.levkin.ca in ~/.ssh/config (see homelab ansible docs).