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98 lines
3.5 KiB
Markdown
98 lines
3.5 KiB
Markdown
# USB Exobrain — Linux Walkthrough
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> Platform-specific companion to `USB-BRAIN-GUIDE.md`. Read the top-level guide first for prerequisites, warnings, and invariants.
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On Linux, auto-mounted removable media typically lands at `/media/$USER/<LABEL>` (GNOME, KDE, auto-mounters) or `/run/media/$USER/<LABEL>` (systemd-udisks2). Substitute your actual mount point below.
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## 1. Create the brain directory
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```bash
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BRAIN=/media/$USER/EXOBRAIN/my-brain
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mkdir -p "$BRAIN"/{bin,memory,artifacts,manifests}
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```
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## 2. Download MCP server binaries
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```bash
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BASE=https://github.com/KeiSeiLab/KeiSeiKit-1.0/releases/download/v0.21.0
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cd "$BRAIN/bin"
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for n in darwin-arm64 darwin-x64 linux-x64 linux-arm64 windows-x64.exe; do
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curl -fL -O "$BASE/kei-mcp-server-$n" 2>/dev/null || echo "skipped $n"
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curl -fL -O "$BASE/kei-mcp-server-$n.sha256" 2>/dev/null || true
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done
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for f in kei-mcp-server-*.sha256; do sha256sum -c "$f"; done
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chmod +x kei-mcp-server-linux-* kei-mcp-server-darwin-* 2>/dev/null || true
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```
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No Gatekeeper / `xattr` step on Linux. The `chmod +x` is still required — the executable bit is not restored by `curl`.
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## 3. Write `manifest.toml` (schema v2)
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```bash
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cat > "$BRAIN/manifest.toml" <<'EOF'
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[brain]
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schema_version = 2
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name = "my-brain"
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created = "2026-04-22T00:00:00Z"
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[paths]
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memory = "memory/"
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artifacts = "artifacts/"
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manifests = "manifests/"
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[paths.mcp_server]
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darwin-arm64 = "bin/kei-mcp-server-darwin-arm64"
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darwin-x64 = "bin/kei-mcp-server-darwin-x64"
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linux-x64 = "bin/kei-mcp-server-linux-x64"
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linux-arm64 = "bin/kei-mcp-server-linux-arm64"
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windows-x64 = "bin/kei-mcp-server-windows-x64.exe"
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EOF
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```
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## 4. Verify + attach
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```bash
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keisei list-adapters
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keisei status # "no brain attached"
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keisei attach "$BRAIN" --scope=user
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```
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Marker lands at `~/.keisei/attached.toml`; Claude Code settings at `~/.claude/settings.json`.
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## 5. Verify in Claude Code
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```bash
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jq '.mcpServers["my-brain"]' ~/.claude/settings.json
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```
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## 6. Multi-client mount
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```bash
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keisei mount "$BRAIN"
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```
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Linux adapter paths: `~/.claude/settings.json`, `~/.cursor/mcp.json`, `~/.continue/config.json`, `~/.config/zed/settings.json`.
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## 7. Project-scope
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```bash
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cd ~/path/to/your-repo
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keisei attach "$BRAIN" --scope=project # claude-code + cursor only
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```
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## 8. Detach + unmount
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```bash
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keisei detach
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umount /media/$USER/EXOBRAIN # or: sync && udisksctl unmount -b /dev/sdX1
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```
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If `umount` returns "target is busy", close any shell with its CWD under the mount, then retry. `lsof +f -- /media/$USER/EXOBRAIN` lists open handles.
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## Linux-specific troubleshooting
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- **Filesystem detection** — `keisei` calls `statfs(2)` at load time. exFAT (`EXFAT_SUPER_MAGIC = 0x2011bab0`) and FAT32 (`MSDOS_SUPER_MAGIC = 0x4d44`) trigger the SQLite-WAL-unsafe advisory. Format the USB as ext4 for reliable multi-client use.
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- **Auto-mounted `noexec` partitions** — some distros mount removable media `noexec` by default. If the mcp server refuses to run, remount read-write-executable: `sudo mount -o remount,exec /media/$USER/EXOBRAIN`. Alternatively add a line to `/etc/fstab` keyed by UUID (`blkid /dev/sdX1`).
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- **Permissions drift** — if you copy a brain from macOS via tar / rsync, the executable bit may not survive. Re-apply `chmod +x bin/kei-mcp-server-*`.
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- **Optional — systemd auto-attach** — a `systemd-udev` rule can run `keisei attach <mount>/my-brain --scope=user` whenever a labelled stick shows up, and a matching `udev` remove rule can call `keisei detach`. Out of scope for this guide; see `ArchWiki: Udisks#Auto-mount`.
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