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101 lines
4.7 KiB
Markdown
101 lines
4.7 KiB
Markdown
---
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type: reference
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description: "Calibre is the e-book library manager that backs Calibre-Web."
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tags:
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- dankserver
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- calibre
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timestamp: 2026-09-21
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---
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# Calibre
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Calibre is the e-book library manager that backs Calibre-Web. It manages metadata, formats, and conversions for the library that Calibre-Web serves.
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**Host:** Dankserver (library directory on host) — **Docs:** https://calibre-ebook.com
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## Role in this Stack
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Calibre itself is a desktop/GUI application, not a container service. This stack runs **Calibre-Web** in a container and points it at an existing Calibre library directory on the Dankserver host.
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Calibre is used to:
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- Import books into the library (drag-and-drop or CLI `calibredb`)
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- Edit metadata (author, title, series, tags, cover art)
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- Convert between formats (EPUB → MOBI, MOBI → EPUB, etc.)
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- Manage collections and reading lists
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The actual library files (`.epub`, `.mobi`, `.pdf`) and the Calibre database (`.db` file) live on the host filesystem. Calibre-Web reads and writes them through the mounted volume.
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## Current Version
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Calibre 9.15.0 is the version on the live host (the upstream latest as of 2026-09-22). Major features include:
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- Bookshelf view
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- Opt-in AI features
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- Content-server path-traversal fix: a bug since v6.16.0 allowed any user with server access to read non-Calibre files on the host. (The CVE-2025-7404 advisory is tracked against Calibre-Web, see [[Calibre-Web]].) Upgrade to 9.15.0+ if serving content to untrusted users.
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## Library Directory
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The live Calibre-Web container bind-mounts the library at `/books`:
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| Purpose | Host path (live) |
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|---------|------------------|
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| Calibre library | `/home/dank/Containers/calibre-web/books` → `/books` in the Calibre-Web container |
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(The older `/opt/calibre-web/books` path was the compose-era location and is
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gone; the quadlet unit mounts the Containers data root.)
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## What the Container Needs
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- Read/write access to the library directory. Calibre-Web edits metadata through the database file.
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- Ownership matching `PUID=1000` / `PGID=1000` (the `dank` user on Dankserver).
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## Calibre Content Server (running)
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Calibre includes a built-in HTTP content server (`calibre-server`) that serves
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the library via OPDS feeds and a web interface:
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- OPDS feeds for mobile reading apps (FBReader, Moon+ Reader, KyBook)
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- Web UI for browsing, metadata editing, and uploads
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- Direct device push (from the GUI, not the content server)
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**Live shape (deployed 2026-09-21):** a rootless Quadlet unit
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(`dankserver/calibre-server/quadlet/calibre-server.container`), boot-persistent
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and self-healing, on `lscr.io/linuxserver/calibre:9.15.0`.
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The image is the current **desktop** build (Selkies web-streamed GUI), not the
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headless image the old compose snippet assumed — the dedicated headless images
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(ta264/docker-calibre, agentgreen/calibre-server) are dormant (calibre 6.10 /
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2017, both below the 9.9.0 content-server fix). The unit therefore runs
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`calibre-server` as the image's s6-overlay main service via `Exec=`.
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| Surface | Host port | Auth |
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|---------|-----------|------|
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| Content server (OPDS + web UI) | **8084** (internal 8090) | HTTP Basic, single admin `calibre` in the SQLite userdb |
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| Desktop GUI (internal only) | none (8080/8181/8082 inside the container) | HTTP Basic ready (`CUSTOM_USER`/`CUSTOM_PASSWORD` in the env file) |
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Port notes: `Network=pasta` on this host is port-FORWARD mode — the container
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keeps its own netns and only `PublishPort`'d ports reach the host (verified
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2026-09-21). The desktop GUI runs but is unreachable: exposing the browser
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GUI is one `PublishPort` line away. 8080 *inside* the container is the
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image's own nginx (the desktop), so the content server runs on internal 8090.
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**Auth model (calibre 9.x):** users live in a SQLite userdb whose `pw` column
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is **plaintext** — the file is mode 600. The single admin account is
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bootstrapped once by the deploy handler
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(`deploy_calibre_server` in `scripts/deploy-remote.sh`) via
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`calibre-server --manage-users -- add`, the password piped on stdin with
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`printf` (a trailing newline from `echo` lands in the stored password and
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breaks every login). The desktop's basic auth (`CUSTOM_USER`/`CUSTOM_PASSWORD`)
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reuses the same pair. Both live in the machine-local env file
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`/home/dank/Containers/calibre-server/env` (mode 600); the repo holds no
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secrets. `--auth-mode=basic` is pinned: on a non-SSL port the server defaults
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to Digest auth, which rejects plain Basic clients with
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`400 Unsupported authentication method`.
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LAN-only (no vhost, no public DNS). The library is mounted read-write — the
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content server writes metadata, the same library Calibre-Web uses.
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## See Also
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- [[Calibre-Web]] — the containerized frontend
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- [[Dankserver Stack]]
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- [[ARR-Stack]] — Readarr for automatic ebook downloads
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