Initial commit.

.dockerignore

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+###
+
+.git*
+
+.dockerignore
+Dockerfile
+
+.editorconfig

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

Dockerfile

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+FROM golang:1.8-alpine
+
+WORKDIR /data
+
+RUN apk add --no-cache \
+	ca-certificates &&\
+	update-ca-certificates
+
+# Install build dependencies (permanently since we are going to keep the
+# ability to install additional plugins which will require a complete Caddy
+# rebuild)
+RUN apk add --no-cache --virtual build-deps \
+	bash \
+	gcc \
+	git \
+	xz
+
+# Preconfiguration
+RUN \
+	git config --global http.followRedirects true &&\
+	mkdir -vp "${GOPATH}"
+
+# Add the scripts
+COPY files/ /usr/local/
+# Fix permissions and line endings in case we use `docker build` from Windows
+# because remember, Docker client can run on Windows despite the host running
+# on Linux!
+RUN \
+	chmod -v +x /usr/local/bin/* &&\
+	sed -i 's,\r,,g' /usr/local/bin/*
+
+# Install Caddy itself
+ARG CADDY_VERSION=master
+RUN \
+	echo "*** Fetching Caddy..." &&\
+	git clone --recursive "https://github.com/mholt/caddy.git" \
+		"$GOPATH/src/github.com/mholt/caddy" &&\
+	(cd "$GOPATH/src/github.com/mholt/caddy" &&\
+		git checkout "$CADDY_VERSION") &&\
+	docker-caddy-build &&\
+	docker-caddy-pack-source
+
+# I would have run "setcap cap_net_bind_service=+ep /usr/local/bin/caddy" as well but it will not work in Docker
+# thanks to inconsistencies with aufs and kernel settings on Ubuntu.
+#
+# My recommendation is to let Caddy bind to a non-root port instead and use the Docker userland proxy if possible,
+# so for example binding Caddy to port 2200 and telling Docker to forward port 80 to port 2200 in the container
+# should be just fine.
+
+ENTRYPOINT ["caddy"]
+CMD ["-agree","-conf=/data/Caddyfile"]

files/bin/docker-caddy-build

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+#!/bin/bash
+
+set -e
+
+export PATH="$GOPATH/bin:$PATH"
+
+docker-caddy-unpack-source
+
+cd "$GOPATH/src/github.com/mholt/caddy/caddy"
+
+# Make sure all dependencies are available
+go get -d -v .
+
+docker-caddy-remove-git-metadata
+
+./build.bash "/usr/local/bin/caddy"
+
+# Remove some reproducible and for runtime unnecessary build output files
+# to save on the image size later on
+rm -rfv \
+  "/tmp"/* \
+  "/var/tmp"/* \
+  "exec" \
+  "lib" \
+  "pkg"

files/bin/docker-caddy-install-plugin

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+#!/bin/bash
+
+set -e
+
+pluginspath="$GOPATH/src/github.com/mholt/caddy/caddy/caddymain/install_plugins.go"
+
+plugin() {
+  echo "*** Fetching plugin $1..."
+
+  # Generate Go import path from given Git URL
+  importpath="${3:-$(echo "$1" | sed -e 's,^.\+://,,' -e 's,\.git$,,')}"
+  git clone "$1" "$GOPATH/src/$importpath"
+
+  (
+    cd "$GOPATH/src/$importpath"
+
+    # Checkout wanted version if any given
+    if [ ! -z "$2" ]
+    then
+      git checkout "$2"
+    fi
+
+    echo "*** Preparing plugin $1..."
+
+    # Fetch dependencies
+    go get -d -v .
+
+    # Run generate across all files (if any extra tools are necessary you will
+    # need to install them before running this script)
+    go generate -v .
+  )
+
+  docker-caddy-remove-git-metadata
+
+  # Add the newly available plugin to an extra Go source file that will be
+  # compiled into the Caddy binary along with the rest of the source tree.
+  if [ ! -e "$pluginspath" ]
+  then
+    echo "package caddymain" > "$pluginspath"
+  fi
+  echo "*** Adding ${importpath} to $pluginspath..."
+  echo "import _ \"${importpath}\"" >> "$pluginspath"
+}
+
+docker-caddy-unpack-source
+
+# Parse arguments and prepare each given plugin.
+# Supported syntaxes (where reference can be a commit hash or branch name etc.):
+#   - http://server.com/user/repository.git
+#   - https://server.com/user/repository.git
+#   - git://server.com/user/repository.git
+#   - http://server.com/user/repository.git#reference
+#   - https://server.com/user/repository.git#reference
+#   - git://server.com/user/repository.git#reference
+for plugin in "$@"; do
+    (IFS='#'; plugin $plugin);
+done
+
+# Rebuild Caddy with the given plugins now installed
+exec docker-caddy-build

files/bin/docker-caddy-pack-source

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+#!/bin/bash
+
+set -e
+
+if [ -n "${DISABLE_SOURCE_COMPRESSION}" ]; then
+  exit 0
+fi
+
+if [ ! -d "${GOPATH}/src/github.com/mholt/caddy" ]; then
+  echo "Tried to pack source when the source directory has been deleted." >&2
+  exit 1
+fi
+
+(
+  cd "${GOPATH}"
+  mkdir -p "/usr/src"
+  tar cJ -f "/usr/src/go.tar.xz" .
+)
+
+exec rm -r "${GOPATH}"

files/bin/docker-caddy-remove-git-metadata

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+#!/bin/bash
+
+set -e
+
+if [ -n "${DISABLE_GIT_METADATA_REMOVAL}" ]; then
+  exit 0
+fi
+
+# Remove Git metadata
+exec find "${GOPATH}" \
+  -name .git -type d \
+  ! -path '*/src/github.com/mholt/caddy/*' \
+  -exec rm -r {} +

files/bin/docker-caddy-unpack-source

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+#!/bin/bash
+
+set -e
+
+if [ -n "${DISABLE_SOURCE_COMPRESSION}" ]; then
+  exit 0
+fi
+
+if [ ! -d "${GOPATH}/src/github.com/mholt/caddy" ]; then
+  mkdir -p "${GOPATH}"
+  tar xJ -C "${GOPATH}" -f "/usr/src/go.tar.xz"
+  rm "/usr/src/go.tar.xz"
+fi