Claude
28252b97d3
host naming, and chain-in from filebrowser/audiobookshelf/emby Reported live: "mount error(79): Can not access a needed shared library" on the local CIFS mount step. That message is misleadingly worded — errno 79 is ENOKEY, not a real missing-library problem, and a plain `guest` mount with no explicit `sec=` hitting it against a real Samba server is a known cifs-utils/kernel-cifs rough edge in the anonymous-session keyring path. Fixed as a side effect of switching away from guest access per direct request (real per-share Samba accounts, not root/guest, matching "user accounts for data directories"): each mount now gets a dedicated Samba account (reusing the SSH username — that Unix account already exists on the home box) with a generated password, remotely provisioned via smbpasswd over the same SSH trust, and mounted locally via a root-only credentials file (same convention tools/mount-network-drive.sh already uses) plus an explicit sec=ntlmssp instead of guest. Host naming: entering a raw IP now offers to name it in /etc/hosts, then uses that name for everything from then on (SSH commands, the CIFS mount address, and re-runs against the same IP). Deliberately /etc/hosts, not ~/.ssh/config — an SSH Host alias only helps the `ssh` command resolve a name, mount.cifs never consults ~/.ssh/config at all, so an alias alone wouldn't get the actual mount using a name. Still offers to also add a matching SSH Host alias on top (pure convenience — skips typing the username for interactive ssh use) when services/ssh-config.sh's helpers are available. Chain-in: filebrowser/audiobookshelf/emby now offer to run vpn-data-mount first if their data is on a home box that isn't mounted yet, and default their own directory prompt to whatever was just mounted (VDM_LAST_MOUNT_POINT, explicitly unset before each chain call so an unrelated earlier vpn-data-mount run in the same setup.sh session can't leak its mount point in as a stale default).
448 lines
20 KiB
Bash
448 lines
20 KiB
Bash
#!/bin/bash
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# services/vpn-data-mount.sh — mount SMB data from a NetBird-connected home
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# box, with SSH-key bootstrap and remote Samba setup automated over SSH.
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# Part of the modular post-install system (sourced by setup.sh).
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#
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# Can also be run standalone on any machine:
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# sudo bash vpn-data-mount.sh
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# (No Docker needed — this only touches SSH, Samba, and /etc/fstab)
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#
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# Unlike most services here, this is repeatable by design: different
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# services can have data on different home boxes, so this asks for a home
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# box IP every time and can be re-run any number of times, once per
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# home-box/share you want mounted. It's the multi-instance pattern from
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# CLAUDE.md generalized from "N instances of one app" to "N independent
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# mounts" — there's no single install directory to gate on, so state lives
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# in /etc/fstab itself (tagged entries), same as tools/mount-network-drive.sh.
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#
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# Assumes the home box is Linux and reachable over a NetBird IP — this repo
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# doesn't set up the home box's side of NetBird (that's a separate machine,
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# possibly not running this repo at all); it only automates the VPS side:
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# SSH trust, then using that SSH access to configure Samba on the home box
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# remotely, then mounting it here.
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#
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# SMB chosen over NFS/SSHFS deliberately: NFS is marginally faster for
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# Linux-to-Linux but SMB isn't a "huge" difference for normal use (media,
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# docs, moderate datasets — the gap shows up mainly on many-small-files
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# workloads). SSHFS was ruled out because the VPN tunnel already encrypts
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# everything — SSHFS's own SSH-layer encryption on top of that is pure
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# redundant overhead for no added security, and it's the slowest and least
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# robust (FUSE reconnect quirks) of the three for an always-on mount.
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#
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# Each share gets a dedicated Samba account (same username as the SSH user,
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# since that Unix account already exists on the home box — no extra remote
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# user to create) with its own generated password, stored locally in a
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# root-only credentials file, same convention tools/mount-network-drive.sh
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# already uses. An earlier version of this made the share guest-accessible
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# instead, reasoning the VPN itself was enough access control — reversed
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# per direct request (real per-share accounts, not root/guest) and because
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# it incidentally fixes a real bug: plain `guest` CIFS mounts with no
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# explicit `sec=` can hit "mount error(79): Can not access a needed shared
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# library" — a misleadingly-worded cifs-utils message for errno 79
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# (ENOKEY), a known rough edge in the kernel cifs.ko keyring/upcall path
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# for anonymous sessions specifically, not an actual missing library.
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# Credentialed mounts with an explicit sec= take the normal NTLMSSP auth
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# path instead and don't hit it.
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# ── Standalone bootstrap ──────────────────────────────────────────────────────
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if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
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[[ "$(id -u)" == "0" ]] || { echo "Run with sudo: sudo bash $0"; exit 1; }
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_SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
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_COMMON="$_SELF_DIR/../lib/common.sh"
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if [[ -f "$_COMMON" ]]; then
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# shellcheck source=../lib/common.sh
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source "$_COMMON"
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else
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log_info() { echo -e "\033[0;34m[INFO]\033[0m $*"; }
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log_success() { echo -e "\033[0;32m[OK]\033[0m $*"; }
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log_warning() { echo -e "\033[1;33m[WARN]\033[0m $*"; }
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log_error() { echo -e "\033[0;31m[ERROR]\033[0m $*" >&2; }
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prompt_text() {
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local _q="$1" _def="$2" _var="$3" _r
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[[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
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read -r -p " $_q " _r
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eval "$_var='${_r:-$_def}'"
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}
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prompt_yn() {
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local _q="$1" _def="$2" _var="$3" _r
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[[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
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read -r -p " $_q " _r
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eval "$_var='${_r:-$_def}'"
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}
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register_service() { :; }
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fi
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ACTUAL_USER="${ACTUAL_USER:-${SUDO_USER:-$USER}}"
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ACTUAL_HOME="$(getent passwd "$ACTUAL_USER" 2>/dev/null | cut -d: -f6 || echo "${HOME:-/root}")"
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DRY_RUN="${DRY_RUN:-false}"
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UNATTENDED="${UNATTENDED:-false}"
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_RUN_STANDALONE=1
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fi
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# ─────────────────────────────────────────────────────────────────────────────
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register_service vpn-data-mount homelab "Mount SMB data from a NetBird-connected home box (SSH-automated remote setup)"
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# ── fstab tagging — the durable record of what this tool has set up ────────
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# Same philosophy as tools/mount-network-drive.sh: /etc/fstab is the single
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# source of truth, no separate state file to drift out of sync with it.
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_VDM_TAG_PREFIX="# vpn-data-mount:"
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_vdm_list_existing() {
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local entries
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entries="$(grep "^${_VDM_TAG_PREFIX}" /etc/fstab 2>/dev/null || true)"
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if [ -n "$entries" ]; then
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echo ""
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log_info "Already-configured VPN data mounts:"
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echo "$entries" | sed "s|^${_VDM_TAG_PREFIX}| •|"
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echo ""
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fi
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}
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# ── Name a raw IP so it can be used everywhere instead of typing it again ──
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# Deliberately /etc/hosts, not ~/.ssh/config: an SSH Host alias only helps
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# the `ssh` command itself resolve a name — mount.cifs (and everything
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# else) never consults ~/.ssh/config at all, so an alias alone wouldn't let
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# the actual CIFS mount address use a name. /etc/hosts is the one mechanism
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# that makes a name resolve for both, which is what "use a name instead of
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# the IP" actually needs end to end.
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# Sets RESOLVED_HOST (not local — same out-param convention as elsewhere).
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_vdm_resolve_host() {
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local input="$1" default_name="$2"
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RESOLVED_HOST="$input"
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# Not a raw IP (already a name, whether from /etc/hosts, real DNS, or
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# just typed that way) — nothing to do.
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[[ "$input" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] || return 0
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# Already named from an earlier vpn-data-mount run against this same IP?
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local existing
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existing="$(awk -v ip="$input" '$1==ip && /# vpn-data-mount/ {print $2; exit}' /etc/hosts 2>/dev/null)"
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if [ -n "$existing" ]; then
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log_info "Already named '$existing' in /etc/hosts from an earlier mount — using that."
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RESOLVED_HOST="$existing"
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return 0
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fi
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# prompt_text always falls back to the given default on blank input
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# (same convention every other prompt in this repo relies on) — so this
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# always ends up naming the host to something, never truly "blank" for
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# "keep using the IP". That's fine: $default_name is already a sensible
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# suggestion (the mount's own label), so Enter alone gives a reasonable
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# name rather than requiring the extra step of confirming one.
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local NAME=""
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prompt_text " Name for this home box (used instead of the IP from now on):" "$default_name" NAME
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NAME="$(echo "$NAME" | tr -cs 'a-zA-Z0-9-' '-' | sed 's/^-*//;s/-*$//')"
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[ -z "$NAME" ] && return 0
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if grep -qE "^\S+[[:space:]]+${NAME}([[:space:]]|\$)" /etc/hosts 2>/dev/null; then
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log_warning "'$NAME' is already used for a different address in /etc/hosts — keeping the IP instead."
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return 0
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fi
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echo "${input} ${NAME} # vpn-data-mount" >> /etc/hosts
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log_success "Added to /etc/hosts: $NAME -> $input (works for SSH, this mount, and anything else on this box)"
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RESOLVED_HOST="$NAME"
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}
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# ── SSH trust: test first, only bootstrap if actually needed ──────────────
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# Covers "the home box and VPS already share a key via GitHub import (or any
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# other means)" for free — if it already works, nothing below runs at all.
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_vdm_ssh_works() {
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local user="$1" host="$2"
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# Runs as $ACTUAL_USER, not root (this whole script runs as root) — the
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# SSH key lives in $ACTUAL_HOME/.ssh, so root's own bare `ssh` would look
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# in the wrong home directory entirely and never find it.
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sudo -u "$ACTUAL_USER" ssh -o BatchMode=yes -o ConnectTimeout=5 -o StrictHostKeyChecking=accept-new \
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"${user}@${host}" true 2>/dev/null
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}
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_vdm_ensure_ssh_trust() {
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local user="$1" host="$2"
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if _vdm_ssh_works "$user" "$host"; then
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log_success "Passwordless SSH to ${user}@${host} already works — nothing to set up."
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return 0
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fi
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log_info "No passwordless SSH to ${user}@${host} yet — setting it up."
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local keyfile="$ACTUAL_HOME/.ssh/id_ed25519"
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if [ ! -f "$keyfile" ]; then
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log_info "No SSH key found at $keyfile — generating one."
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sudo -u "$ACTUAL_USER" mkdir -p "$ACTUAL_HOME/.ssh"
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sudo -u "$ACTUAL_USER" ssh-keygen -t ed25519 -N "" -f "$keyfile" -C "${ACTUAL_USER}@$(hostname)-vpn-data-mount" \
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|| { log_error "Key generation failed."; return 1; }
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chmod 700 "$ACTUAL_HOME/.ssh"
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chmod 600 "$keyfile"
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chmod 644 "${keyfile}.pub"
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fi
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echo ""
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echo " This box's public key (needs to end up in ${user}'s authorized_keys"
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echo " on the home box, one way or another):"
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echo ""
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sed 's/^/ /' "${keyfile}.pub"
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echo ""
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while true; do
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echo " How do you want to get it there?"
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echo " 1) Try now with ssh-copy-id (needs password login enabled on the home box)"
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echo " 2) I'll add it myself — paste it into ~/.ssh/authorized_keys there, or add it"
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echo " to your GitHub account and run 'ssh-import-id gh:<user>' on the home box"
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echo " (same mechanism this repo's own base.sh setup uses)"
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echo " 3) Cancel this mount"
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echo ""
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local CHOICE=""
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prompt_text " Choice [1/2/3]:" "1" CHOICE
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case "$CHOICE" in
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1)
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sudo -u "$ACTUAL_USER" ssh-copy-id -i "${keyfile}.pub" "${user}@${host}" \
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|| log_warning "ssh-copy-id failed — password auth may be disabled on the home box. Try option 2."
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;;
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2)
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echo ""
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read -r -p " Press Enter once the key is in place on the home box: " _
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;;
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3|c|C)
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log_info "Cancelled."
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return 1
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;;
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*)
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log_warning "Invalid choice."
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continue
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;;
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esac
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if _vdm_ssh_works "$user" "$host"; then
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log_success "Passwordless SSH to ${user}@${host} confirmed."
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return 0
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fi
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log_warning "Still can't connect without a password — try again, or cancel."
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done
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}
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# ── Remote Samba setup, driven entirely over the SSH trust above ──────────
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# Sets SMB_PASS (not local — read by the caller to write the local
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# credentials file), same out-param convention as lib/common.sh's
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# ensure_coturn_user/configure_caddy_for_service.
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_vdm_setup_remote_samba() {
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local user="$1" host="$2" remote_path="$3" share_name="$4"
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SMB_PASS=""
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log_info "Checking Samba on the home box..."
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# Every ssh call below runs as $ACTUAL_USER, same reason as _vdm_ssh_works.
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if ! sudo -u "$ACTUAL_USER" ssh "${user}@${host}" 'command -v smbd >/dev/null 2>&1'; then
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log_info "Installing Samba on the home box (may prompt for the sudo password there)..."
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sudo -u "$ACTUAL_USER" ssh -t "${user}@${host}" 'sudo apt-get update -y && sudo apt-get install -y samba' \
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|| { log_error "Remote Samba install failed."; return 1; }
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else
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log_success "Samba already installed on the home box."
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fi
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SMB_PASS="$(openssl rand -base64 16 | tr -dc 'a-zA-Z0-9' | head -c 16)"
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log_info "Configuring the share and Samba account on the home box..."
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# Idempotent: drop any prior block for this exact share name, then
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# append a fresh one. Dedicated account (not guest) — see the file
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# header for why, and for the errno-79 connection.
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#
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# The Samba account reuses $user — that Unix account already exists on
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# the home box (it's who we're SSH'd in as), so no extra remote user
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# needs creating. smbpasswd's password ends up briefly visible in the
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# home box's own `ps` output for this one remote command's duration
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# (embedded in the command string, not piped — piping through a `-t`
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# pty session for a command that may also need an interactive sudo
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# password gets stdin-ordering-fragile fast). Accepted tradeoff, same
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# spirit as this whole feature already trusting the VPN's reachability
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# boundary — see file header.
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local remote_cmd
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remote_cmd=$(cat << REMOTECMD
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set -e
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sudo mkdir -p '${remote_path}'
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sudo cp /etc/samba/smb.conf /etc/samba/smb.conf.backup.\$(date +%Y%m%d-%H%M%S) 2>/dev/null || true
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sudo sed -i "/^\\[${share_name}\\]\$/,/^\$/d" /etc/samba/smb.conf
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{
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echo ""
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echo "[${share_name}]"
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echo " path = ${remote_path}"
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echo " browseable = yes"
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echo " read only = no"
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echo " guest ok = no"
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echo " valid users = ${user}"
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echo " force user = ${user}"
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} | sudo tee -a /etc/samba/smb.conf >/dev/null
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printf '%s\n%s\n' '${SMB_PASS}' '${SMB_PASS}' | sudo smbpasswd -a -s '${user}'
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sudo smbpasswd -e '${user}'
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sudo systemctl restart smbd
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command -v ufw >/dev/null 2>&1 && sudo ufw allow samba >/dev/null 2>&1 || true
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REMOTECMD
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)
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if sudo -u "$ACTUAL_USER" ssh -t "${user}@${host}" "$remote_cmd"; then
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log_success "Remote share [$share_name] -> $remote_path configured, Samba account '$user' set, smbd restarted."
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else
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log_error "Remote Samba configuration failed — check the output above."
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return 1
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fi
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}
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# ── Local mount + fstab ─────────────────────────────────────────────────────
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_vdm_mount_local() {
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local host="$1" share_name="$2" mount_point="$3" label="$4" smb_user="$5" smb_pass="$6"
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command -v mount.cifs >/dev/null 2>&1 || apt-get install -y cifs-utils -qq
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mkdir -p "$mount_point"
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# Credentials file, not a guest/inline password — root-only, matching
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# tools/mount-network-drive.sh's existing convention for SMB creds.
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local creds_file="/etc/samba/credentials.vpn-data-mount-${label}"
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mkdir -p /etc/samba
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cat > "$creds_file" << CREDS
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username=${smb_user}
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password=${smb_pass}
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CREDS
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chmod 600 "$creds_file"
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chown root:root "$creds_file"
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# sec=ntlmssp explicitly — see the file header on errno 79/ENOKEY.
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# Modern default and what a credentialed mount should use anyway.
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local opts="credentials=${creds_file},sec=ntlmssp,uid=$(id -u "$ACTUAL_USER"),gid=$(id -g "$ACTUAL_USER"),iocharset=utf8,nofail,_netdev"
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local share="//${host}/${share_name}"
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log_info "Testing mount..."
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if mount -t cifs -o "$opts" "$share" "$mount_point"; then
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log_success "Mounted at $mount_point"
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else
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log_error "Mount failed — check connectivity to $host and the remote share config."
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rmdir "$mount_point" 2>/dev/null || true
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return 1
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fi
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if grep -qs "$mount_point" /etc/fstab; then
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log_warning "$mount_point already in /etc/fstab — skipping fstab entry."
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return 0
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fi
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local bk="/etc/fstab.backup.$(date +%Y%m%d-%H%M%S)"
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cp /etc/fstab "$bk"
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{
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echo ""
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echo "${_VDM_TAG_PREFIX} ${label} — ${host}:${share_name} -> ${mount_point}"
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printf '%-40s %-25s %-6s %s 0 0\n' "$share" "$mount_point" "cifs" "$opts"
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} >> /etc/fstab
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log_success "Added to /etc/fstab (backup: $(basename "$bk"))"
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}
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# ── One mount, start to finish ──────────────────────────────────────────────
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_vdm_add_mount() {
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echo ""
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local LABEL=""
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while true; do
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prompt_text " Short label for this mount (e.g. 'media', 'nas-docs'):" "" LABEL
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LABEL="$(echo "$LABEL" | tr -cs 'a-zA-Z0-9-' '-' | sed 's/^-*//;s/-*$//')"
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if [ -z "$LABEL" ]; then
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log_warning "Label can't be empty."; continue
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fi
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if grep -q "^${_VDM_TAG_PREFIX} ${LABEL} " /etc/fstab 2>/dev/null; then
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log_warning "Label '$LABEL' is already used — pick another."; continue
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fi
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break
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done
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local HOST_INPUT="" HOST="" SSH_USER=""
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prompt_text " Home box's NetBird IP or an already-named host (check 'netbird status' on that box):" "" HOST_INPUT
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if [ -z "$HOST_INPUT" ]; then
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log_warning "No host entered — cancelling this mount."
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return 1
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fi
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_vdm_resolve_host "$HOST_INPUT" "$LABEL"
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HOST="$RESOLVED_HOST"
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prompt_text " SSH username on the home box:" "$ACTUAL_USER" SSH_USER
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_vdm_ensure_ssh_trust "$SSH_USER" "$HOST" || return 1
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# Pure convenience on top of the /etc/hosts naming above (which is what
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# actually makes the mount itself usable by name) — an SSH Host alias
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# additionally skips typing the username for interactive `ssh` use.
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# Only offered for a genuinely new name, not every time this mount (or
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# another one on the same host) is set up.
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if [[ ! "$HOST" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$ ]] \
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&& declare -F add_ssh_host_alias >/dev/null 2>&1 \
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&& declare -F ssh_host_alias_exists >/dev/null 2>&1 \
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&& ! ssh_host_alias_exists "$HOST"; then
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local ADD_ALIAS=""
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|
prompt_yn " Also add '$HOST' as an SSH alias (ssh $HOST, no username needed)? (y/n):" "y" ADD_ALIAS
|
|
[[ "$ADD_ALIAS" =~ ^[Yy]$ ]] && add_ssh_host_alias "$HOST" "$HOST_INPUT" "$SSH_USER" "22"
|
|
fi
|
|
|
|
local REMOTE_PATH="" MOUNT_POINT=""
|
|
prompt_text " Path on the home box to share (e.g. /home/${SSH_USER}/media):" "" REMOTE_PATH
|
|
if [ -z "$REMOTE_PATH" ]; then
|
|
log_warning "No path entered — cancelling this mount."
|
|
return 1
|
|
fi
|
|
prompt_text " Local mount point:" "/mnt/${LABEL}" MOUNT_POINT
|
|
|
|
_vdm_setup_remote_samba "$SSH_USER" "$HOST" "$REMOTE_PATH" "$LABEL" || return 1
|
|
_vdm_mount_local "$HOST" "$LABEL" "$MOUNT_POINT" "$LABEL" "$SSH_USER" "$SMB_PASS" || return 1
|
|
|
|
# Read by callers like services/filebrowser.sh/audiobookshelf.sh/emby.sh
|
|
# that chain into this service and want to default their own "which
|
|
# directory" prompt to whatever was just mounted, without needing to
|
|
# know or guess the path themselves.
|
|
VDM_LAST_MOUNT_POINT="$MOUNT_POINT"
|
|
|
|
echo ""
|
|
log_success "Done: $HOST:$REMOTE_PATH is now mounted at $MOUNT_POINT"
|
|
echo " Manage this and other network mounts anytime with:"
|
|
echo " sudo bash tools/mount-network-drive.sh"
|
|
}
|
|
|
|
install_vpn-data-mount() {
|
|
echo ""
|
|
echo "╔══════════════════════════════════════════════════════════╗"
|
|
echo "║ VPN Data Mount — SMB share from a NetBird-connected box ║"
|
|
echo "╚══════════════════════════════════════════════════════════╝"
|
|
|
|
if [ "$DRY_RUN" = true ]; then
|
|
echo "[DRY-RUN] Would offer to name a raw IP in /etc/hosts for reuse (SSH + this mount)"
|
|
echo "[DRY-RUN] Would test/set up passwordless SSH to a home box over its NetBird IP"
|
|
echo "[DRY-RUN] Would remotely install Samba + configure a share and a dedicated account there"
|
|
echo "[DRY-RUN] Would mount it locally over CIFS (credentials file, not guest) and add it to /etc/fstab"
|
|
echo "[DRY-RUN] Repeatable — can be run again for additional home boxes/shares"
|
|
return 0
|
|
fi
|
|
|
|
# Every prompt below (home box IP, remote path, ...) has no sane
|
|
# unattended default — unlike most services here, there's no reasonable
|
|
# value to fall back to. Skip outright rather than let prompt_text's
|
|
# always-blank UNATTENDED behavior spin the label-validation loop below
|
|
# forever.
|
|
if [ "$UNATTENDED" = true ]; then
|
|
log_info "Skipping — needs interactive input (home box IP, path, ...). Run 'sudo ./setup.sh vpn-data-mount' without --unattended."
|
|
return 0
|
|
fi
|
|
|
|
_vdm_list_existing
|
|
|
|
while true; do
|
|
local ADD=""
|
|
prompt_yn "Add a VPN data mount now? (y/n):" "y" ADD
|
|
[[ "$ADD" =~ ^[Yy]$ ]] || break
|
|
|
|
_vdm_add_mount
|
|
|
|
local AGAIN=""
|
|
prompt_yn "Add another mount (can be from a different home box)? (y/n):" "n" AGAIN
|
|
[[ "$AGAIN" =~ ^[Yy]$ ]] || break
|
|
done
|
|
}
|
|
|
|
[[ "${_RUN_STANDALONE:-0}" == 1 ]] && install_vpn-data-mount
|