Added documentation and installer support for the github secondary mirror

CHANGELOG.md

@@ -44,10 +44,13 @@ Initial public release.
   `quptime` user, `ProtectSystem=strict`, all capabilities dropped by
   default.
 - **Multi-arch Docker images** (`linux/amd64`, `linux/arm64`)
-  published to `git.cer.sh/axodouble/quptime`.
+  published to `git.cer.sh/axodouble/quptime` (primary) and
+  `ghcr.io/axodouble/quptime` (GitHub push-mirror) on every tag.
 - **Static Linux binaries** (`amd64`, `arm64`) published per tag with
-  a `SHA256SUMS` file; the official installer verifies the checksum
-  before placing the binary on disk.
+  a `SHA256SUMS` file to both Gitea Releases (primary) and GitHub
+  Releases (mirror). The official installer prefers Gitea, falls back
+  to GitHub on failure, and verifies the checksum before placing the
+  binary on disk.
 
 ### Security
 

README.md

@@ -14,12 +14,37 @@ trust — no central CA, no shared secret.
 
 ### From pre-built binary
 
-This can be done in one step, either by downloading the latest release from
-the [Gitea releases page](https://git.cer.sh/axodouble/quptime/releases) or by running the following script:
+The canonical home is Gitea; the repo is push-mirrored to GitHub on
+every tag. Releases and multi-arch container images are published to
+both.
+
+| Source           | Releases                                                     | Container image                  |
+| ---------------- | ------------------------------------------------------------ | -------------------------------- |
+| Gitea (primary)  | <https://git.cer.sh/axodouble/quptime/releases>              | `git.cer.sh/axodouble/quptime`   |
+| GitHub (mirror)  | <https://github.com/Axodouble/QUptime/releases>              | `ghcr.io/axodouble/quptime`      |
+
+One-step install — tries Gitea first, falls back to GitHub automatically:
+
 ```sh
 curl -fsSL https://git.cer.sh/Axodouble/QUptime/raw/branch/master/install.sh | sudo bash
+# or, via the GitHub mirror:
+# curl -fsSL https://raw.githubusercontent.com/Axodouble/QUptime/master/install.sh | sudo bash
 ```
 
+The script verifies the binary against the published `SHA256SUMS`
+before installing and refuses to proceed on a mismatch.
+
+### From Docker
+
+```sh
+docker pull git.cer.sh/axodouble/quptime:latest
+# or, via the GitHub mirror:
+# docker pull ghcr.io/axodouble/quptime:latest
+```
+
+See [docs/deployment/docker.md](docs/deployment/docker.md) for compose
+recipes.
+
 ## Why
 
 Most uptime monitors are either a SaaS or a single box that, by

docker/docker-compose-tailscale.yml

@@ -25,7 +25,7 @@ services:
     restart: unless-stopped
 
   quptime:
-    image: git.cer.sh/axodouble/quptime:master
+    image: git.cer.sh/axodouble/quptime:latest
     container_name: quptime
     environment:
       # host:port other QUptime nodes use to reach this one. Use the

docs/deployment/docker.md

@@ -7,6 +7,13 @@ daemon can bind privileged ports and open ICMP sockets; override with
 
 ## Image references
 
+The same multi-arch (amd64 + arm64) image is published to two
+registries. **The Gitea registry is the canonical source** — it also
+publishes canary `:master` builds on every branch push. GHCR is a
+tag-only push-mirror for users who can't reach `git.cer.sh`.
+
+Primary — Gitea registry:
+
 ```
 git.cer.sh/axodouble/quptime:master          # tip of main, multi-arch
 git.cer.sh/axodouble/quptime:latest          # latest tagged release
@@ -14,6 +21,14 @@ git.cer.sh/axodouble/quptime:v0.0.1          # specific tagged release
 git.cer.sh/axodouble/quptime:latest-amd64    # single-arch (if you must pin)
 ```
 
+Fallback — GitHub Container Registry:
+
+```
+ghcr.io/axodouble/quptime:latest             # latest tagged release
+ghcr.io/axodouble/quptime:v0.0.1             # specific tagged release
+ghcr.io/axodouble/quptime:0.0                # latest patch in the 0.0 minor line
+```
+
 The image embeds `QUPTIME_DIR=/etc/quptime` and declares it a volume —
 treat it as the only piece of state worth persisting.
 

docs/installation.md

@@ -10,22 +10,36 @@ matches how you manage software on the host.
 
 ## Pre-built binary (recommended)
 
-Releases are published to the [Gitea releases
-page](https://git.cer.sh/axodouble/quptime/releases) with a
-`SHA256SUMS` file. Two architectures are built: `linux-amd64` and
-`linux-arm64`.
+Every tag triggers identical builds on both sources, so either one
+serves the same artefact set. Gitea is the canonical home; GitHub is a
+push-mirror.
+
+Primary — Gitea releases:
+<https://git.cer.sh/axodouble/quptime/releases>
+
+Fallback — GitHub releases (mirrored from the same tag):
+<https://github.com/Axodouble/QUptime/releases>
+
+Each release ships `qu-${TAG}-linux-amd64`, `qu-${TAG}-linux-arm64`,
+and a `SHA256SUMS` file.
 
 ```sh
 # Always pin to a tag — `latest` resolves on the server side.
-TAG=v0.1.0
+TAG=v0.0.1
 ARCH=amd64   # or arm64
 
+# Primary: Gitea
 curl -fSL -o qu \
   "https://git.cer.sh/axodouble/quptime/releases/download/${TAG}/qu-${TAG}-linux-${ARCH}"
 curl -fSL -o SHA256SUMS \
   "https://git.cer.sh/axodouble/quptime/releases/download/${TAG}/SHA256SUMS"
 
-# Verify before installing.
+# (or the GitHub mirror — substitute the host below if Gitea is unreachable)
+#   https://github.com/Axodouble/QUptime/releases/download/${TAG}/qu-${TAG}-linux-${ARCH}
+#   https://github.com/Axodouble/QUptime/releases/download/${TAG}/SHA256SUMS
+
+# Verify before installing. Use the SHA256SUMS from the SAME source
+# as the binary — never mix.
 sha256sum --check --ignore-missing SHA256SUMS
 
 install -m 0755 qu /usr/local/bin/qu
@@ -34,31 +48,37 @@ install -m 0755 qu /usr/local/bin/qu
 ## One-line install script
 
 The repo ships an `install.sh` that handles the download, checksum,
-shell-completion installation, and a default systemd unit file. Run it
+shell-completion installation, and a hardened systemd unit. Run it
 under `sudo` so it can write to `/usr/local/bin` and
 `/etc/systemd/system`.
 
 ```sh
 curl -fsSL https://git.cer.sh/Axodouble/QUptime/raw/branch/master/install.sh | sudo bash
+# or, via the GitHub mirror:
+# curl -fsSL https://raw.githubusercontent.com/Axodouble/QUptime/master/install.sh | sudo bash
 ```
 
 What it does:
 
-1. Looks up the latest release via the Gitea API.
-2. Downloads the binary to `/usr/local/bin/qu`.
+1. Looks up the latest release via the Gitea API; falls back to the
+   GitHub API if Gitea is unreachable.
+2. Downloads the per-arch binary and the matching `SHA256SUMS` from
+   the same source, then verifies the checksum. Refuses to install on
+   a mismatch.
 3. Installs bash / zsh / fish completion if a target directory exists.
-4. Writes `/etc/systemd/system/qu-serve.service` and enables it (but
-   does **not** start it — you need to run `qu init` first).
-
-The unit it writes is minimal. For a production unit with hardening,
-see the [systemd deployment guide](deployment/systemd.md).
+4. Creates a dedicated `quptime` system user and writes
+   `/etc/systemd/system/quptime.service` (hardened — matches the unit
+   in [systemd.md](deployment/systemd.md)). Enables but does not start
+   the service, so you can configure identity before first boot.
 
 ## Build from source
 
 Requires Go 1.24.2 or newer.
 
 ```sh
+# Either remote — Gitea is canonical, GitHub is a push-mirror.
 git clone https://git.cer.sh/axodouble/quptime.git
+# git clone https://github.com/Axodouble/QUptime.git
 cd quptime
 go build -ldflags "-X main.version=$(git describe --tags --always)" -o qu ./cmd/qu
 
@@ -74,15 +94,26 @@ CGO_ENABLED=0 go build -trimpath -ldflags "-s -w" -o qu ./cmd/qu
 
 ## Docker image
 
-A multi-arch (`amd64` + `arm64`) image is published to the Gitea
-registry on every tag and every push to `master`:
+The same multi-arch (`amd64` + `arm64`) image is published to two
+registries on every tag. The Gitea registry is the canonical source
+and also gets canary `:master` builds; GHCR is a tag-only mirror.
+
+Primary — Gitea registry:
 
 ```
-git.cer.sh/axodouble/quptime:master   # tip of main
+git.cer.sh/axodouble/quptime:master   # tip of main (canary)
 git.cer.sh/axodouble/quptime:latest   # latest tagged release
 git.cer.sh/axodouble/quptime:v0.0.1   # pinned release
 ```
 
+Fallback — GitHub Container Registry:
+
+```
+ghcr.io/axodouble/quptime:latest      # latest tagged release
+ghcr.io/axodouble/quptime:v0.0.1      # pinned release
+ghcr.io/axodouble/quptime:0.0         # latest 0.0.x
+```
+
 See the [Docker deployment guide](deployment/docker.md) for compose
 files and volume layout.
 

install.sh

@@ -1,12 +1,17 @@
 #!/bin/bash
 # QUptime installer.
 #
-# Downloads the latest released `qu` binary from the Gitea release
-# page, verifies it against the published SHA256SUMS, installs it to
-# /usr/local/bin, and (on systemd hosts) drops in a hardened
-# quptime.service that matches the unit documented in
-# docs/deployment/systemd.md. Idempotent — re-running upgrades the
-# binary and refreshes the unit without touching the data directory.
+# Downloads the latest released `qu` binary, verifies it against the
+# published SHA256SUMS, installs it to /usr/local/bin, and (on systemd
+# hosts) drops in a hardened quptime.service that matches the unit
+# documented in docs/deployment/systemd.md.
+#
+# Release sources, tried in order:
+#   1. Gitea:    git.cer.sh/axodouble/quptime/releases   (primary — canonical home)
+#   2. GitHub:   github.com/Axodouble/QUptime/releases   (push-mirror fallback)
+#
+# Idempotent — re-running upgrades the binary and refreshes the unit
+# without touching the data directory.
 set -euo pipefail
 
 INSTALL_BIN="/usr/local/bin/qu"
@@ -15,8 +20,15 @@ SERVICE_NAME="$(basename "$SERVICE_FILE")"
 SERVICE_USER="quptime"
 SERVICE_GROUP="quptime"
 DATA_DIR="/etc/quptime"
-REPO_API="https://git.cer.sh/api/v1/repos/axodouble/quptime/releases/latest"
-RELEASE_BASE="https://git.cer.sh/axodouble/quptime/releases/download"
+
+# Release sources, in preference order. Each row is:
+#   <name>|<latest-release API endpoint>|<release-asset base URL>
+# The asset URL is concatenated with `/<tag>/<filename>`. Adjust here
+# if the project moves hosts.
+SOURCES=(
+    "gitea|https://git.cer.sh/api/v1/repos/axodouble/quptime/releases/latest|https://git.cer.sh/axodouble/quptime/releases/download"
+    "github|https://api.github.com/repos/Axodouble/QUptime/releases/latest|https://github.com/Axodouble/QUptime/releases/download"
+)
 
 fail() {
     echo "Error: $*" >&2
@@ -38,6 +50,51 @@ write_completion() {
     return 1
 }
 
+# fetch_from_source tries one release source end-to-end: pulls the
+# latest tag from its API, downloads the per-arch binary and the
+# accompanying SHA256SUMS, and verifies the checksum. Returns 0 on
+# success (with RELEASE and BINARY_NAME set as globals) or 1 if any
+# step fails — callers can then try the next source. Stderr is kept
+# quiet so a failed primary doesn't spam the operator before the
+# fallback is attempted.
+fetch_from_source() {
+    local api_url=$1
+    local release_base=$2
+    local tmpdir=$3
+
+    local release
+    release=$(curl -fsSL --proto '=https' --tlsv1.2 "$api_url" 2>/dev/null | jq -r '.tag_name' 2>/dev/null) \
+        || return 1
+    [ -n "$release" ] && [ "$release" != "null" ] || return 1
+
+    local binary_name="qu-${release}-linux-${ARCH}"
+    local binary_url="${release_base}/${release}/${binary_name}"
+    local sums_url="${release_base}/${release}/SHA256SUMS"
+
+    curl -fsSL --proto '=https' --tlsv1.2 -o "$tmpdir/$binary_name" "$binary_url" 2>/dev/null \
+        || return 1
+    curl -fsSL --proto '=https' --tlsv1.2 -o "$tmpdir/SHA256SUMS" "$sums_url" 2>/dev/null \
+        || return 1
+
+    # Verify against the SHA256SUMS that came from the same source as
+    # the binary. Never mix sources here — verifying a GitHub-hosted
+    # binary against a Gitea-hosted SHA256SUMS would defeat the
+    # tamper check.
+    (
+        cd "$tmpdir"
+        if ! grep -E "[[:space:]]\\*?${binary_name}\$" SHA256SUMS > expected.sum; then
+            exit 1
+        fi
+        if ! sha256sum -c expected.sum >/dev/null 2>&1; then
+            exit 1
+        fi
+    ) || return 1
+
+    RELEASE="$release"
+    BINARY_NAME="$binary_name"
+    return 0
+}
+
 require_command curl
 require_command jq
 require_command sha256sum
@@ -55,44 +112,39 @@ if [ ! -w "$(dirname "$INSTALL_BIN")" ]; then
     fail "Cannot write to $(dirname "$INSTALL_BIN"). Run this script with sudo, or set INSTALL_BIN to a writable location."
 fi
 
-# --- latest release tag -------------------------------------------------
-RELEASE=$(curl -fsSL "$REPO_API" | jq -r '.tag_name')
-[ -n "$RELEASE" ] && [ "$RELEASE" != "null" ] \
-    || fail "could not determine the latest release tag from $REPO_API"
-
-BINARY_NAME="qu-${RELEASE}-linux-${ARCH}"
-BINARY_URL="${RELEASE_BASE}/${RELEASE}/${BINARY_NAME}"
-SUMS_URL="${RELEASE_BASE}/${RELEASE}/SHA256SUMS"
-
-# --- download + verify --------------------------------------------------
-# Stage in a temp dir so a failed verification never leaves a partial
-# or unverified binary on disk.
+# --- download + verify (with fallback) ----------------------------------
 TMPDIR=$(mktemp -d)
 trap 'rm -rf "$TMPDIR"' EXIT
 
-echo "> downloading $BINARY_NAME"
-curl -fsSL --proto '=https' --tlsv1.2 -o "$TMPDIR/$BINARY_NAME" "$BINARY_URL"
-echo "> downloading SHA256SUMS"
-curl -fsSL --proto '=https' --tlsv1.2 -o "$TMPDIR/SHA256SUMS" "$SUMS_URL"
+# Globals filled in by fetch_from_source on success.
+RELEASE=""
+BINARY_NAME=""
+INSTALLED_FROM=""
+INSTALLED_TMP=""
 
-echo "> verifying checksum"
-# Pull just our binary's entry so sha256sum -c doesn't fail on the
-# arches we didn't download.
-(
-    cd "$TMPDIR"
-    if ! grep -E "[[:space:]]\\*?${BINARY_NAME}\$" SHA256SUMS > expected.sum; then
-        fail "no entry for $BINARY_NAME in published SHA256SUMS — refusing to install"
+for source_spec in "${SOURCES[@]}"; do
+    IFS='|' read -r src_name src_api src_base <<<"$source_spec"
+    src_tmp="$TMPDIR/$src_name"
+    mkdir -p "$src_tmp"
+    echo "> trying release source: $src_name"
+    # `set -e` would abort the whole script the moment fetch_from_source
+    # returns nonzero; we want the loop to fall through to the next
+    # source instead. Wrap the call so a failure is just data.
+    if fetch_from_source "$src_api" "$src_base" "$src_tmp"; then
+        INSTALLED_FROM="$src_name"
+        INSTALLED_TMP="$src_tmp"
+        echo "> $src_name: ${RELEASE} ✓ checksum OK"
+        break
     fi
-    if ! sha256sum -c expected.sum >/dev/null 2>&1; then
-        echo "expected: $(awk '{print $1}' expected.sum)"
-        echo "actual:   $(sha256sum "$BINARY_NAME" | awk '{print $1}')"
-        fail "checksum mismatch for $BINARY_NAME — refusing to install"
-    fi
-)
-echo "> checksum OK"
+    echo "> $src_name: unavailable"
+done
 
-install -m 0755 "$TMPDIR/$BINARY_NAME" "$INSTALL_BIN"
-echo "> qu ${RELEASE} installed to $INSTALL_BIN"
+if [ -z "$INSTALLED_FROM" ]; then
+    fail "no release source reachable — tried: $(printf '%s ' "${SOURCES[@]%%|*}"). Check network access to git.cer.sh and github.com."
+fi
+
+install -m 0755 "$INSTALLED_TMP/$BINARY_NAME" "$INSTALL_BIN"
+echo "> qu ${RELEASE} installed to $INSTALL_BIN (source: $INSTALLED_FROM)"
 
 # --- shell completions --------------------------------------------------
 if "$INSTALL_BIN" --help 2>/dev/null | grep -q "completion"; then