Add dockerd package

root-packages/dockerd/build.sh

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+TERMUX_PKG_HOMEPAGE=https://docs.docker.com/engine/
+TERMUX_PKG_DESCRIPTION="Server daemon process for building and containerizing applications."
+TERMUX_PKG_LICENSE="Apache-2.0"
+TERMUX_PKG_MAINTAINER="@termux"
+TERMUX_PKG_VERSION=20.10.2
+TERMUX_PKG_SRCURL=https://github.com/moby/moby/archive/v${TERMUX_PKG_VERSION}.tar.gz
+TERMUX_PKG_SHA256=dc4818f0cba2ded2f6f7420a1fda027ddbf6c6c9fe319f84d1311bfe610447ca
+#TERMUX_PKG_DEPENDS="containerd"
+#TERMUX_PKG_BLACKLISTED_ARCHES="arm, i686, x86_64"
+
+termux_step_make() {
+	# setup go build environment
+	termux_setup_golang
+
+	# apply some patches in a batch
+	xargs sed -i "s_\(/etc/docker\)_$PREFIX\1_g" < <(grep -R /etc/docker | cut -d':' -f1 | sort | uniq)
+	xargs sed -i 's/[a-zA-Z0-9]*\.GOOS/"linux"/g' < <(grep -R '[a-zA-Z0-9]*\.GOOS' | cut -d':' -f1 | sort | uniq)
+
+
+	# issue the build command
+	export DOCKER_GITCOMMIT=8891c58a43
+	export DOCKER_BUILDTAGS='exclude_graphdriver_btrfs exclude_graphdriver_devicemapper exclude_graphdriver_quota selinux exclude_graphdriver_aufs'
+	while ! files=$(AUTO_GOPATH=1 PREFIX='' hack/make.sh dynbinary 2>&1 1>/dev/null); do xargs sed -i 's/\("runtime"\)/_ \1/' < <(echo $files | grep runtime | cut -d':' -f1 | cut -c38-); done
+}
+
+termux_step_make_install() {
+	install -Dm 0700 bundles/dynbinary-daemon/dockerd-dev ${TERMUX_PREFIX}/bin/dockerd-dev
+	install -Dm 0700 ${TERMUX_PKG_BUILDER_DIR}/dockerd ${TERMUX_PREFIX}/bin/dockerd
+	install -Dm 0700 ${TERMUX_PKG_BUILDER_DIR}/daemon.json ${TERMUX_PREFIX}/etc/docker/daemon.json
+}

root-packages/dockerd/daemon.json

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+{
+    "data-root": "/data/docker/lib/docker",
+    "exec-root": "/data/docker/run/docker",
+    "pidfile": "/data/docker/run/docker.pid",
+    "hosts": [
+        "unix:///data/docker/run/docker.sock"
+    ],
+    "storage-driver": "overlay2"
+}

root-packages/dockerd/dockerd

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+#!/data/data/com.termux/files/usr/bin/bash
+
+export PATH="${PATH}:/system/xbin:/system/bin"
+opts='rw,nosuid,nodev,noexec,relatime'
+cgroups='blkio cpu cpuacct cpuset devices freezer memory pids schedtune'
+
+# try to mount cgroup root dir and exit in case of failure
+if ! mountpoint -q /sys/fs/cgroup 2>/dev/null; then
+  mkdir -p /sys/fs/cgroup
+  mount -t tmpfs -o "${opts}" cgroup_root /sys/fs/cgroup || exit
+fi
+
+# try to mount cgroup2
+if ! mountpoint -q /sys/fs/cgroup/cg2_bpf 2>/dev/null; then
+  mkdir -p /sys/fs/cgroup/cg2_bpf
+  mount -t cgroup2 -o "${opts}" cgroup2_root /sys/fs/cgroup/cg2_bpf
+fi
+
+# try to mount differents cgroups
+for cg in ${cgroups}; do
+  if ! mountpoint -q "/sys/fs/cgroup/${cg}" 2>/dev/null; then
+    mkdir -p "/sys/fs/cgroup/${cg}"
+    mount -t cgroup -o "${opts},${cg}" "${cg}" "/sys/fs/cgroup/${cg}" \
+    || rmdir "/sys/fs/cgroup/${cg}"
+  fi
+done
+
+# start the docker daemon
+dockerd-dev $@
+