Documentation and build process

Former-commit-id: cbe39498c3

podman-update/00-podman-update.sh

@@ -14,7 +14,7 @@ mv /usr/libexec/podman/conmon /usr/libexec/podman/conmon.old
 ln -s $CONMON_DL /usr/libexec/podman/conmon
 
 if [ ! -f $PODMAN_DL ]; then
-  curl -fsSLo $PODMAN_DL https://raw.githubusercontent.com/boostchicken/udm-utilities/master/podman-update/bin/podman
+  curl -fsSLo $PODMAN_DL https://raw.githubusercontent.com/boostchicken/udm-utilities/master/podman-update/bin/podman-3.2.0-dev
 fi
 chmod +x $PODMAN_DL
 mv /usr/bin/podman /usr/bin/podman.old

podman-update/README.md

@@ -0,0 +1,67 @@
+# Podman Update
+
+## Features
+
+1. Podman 3.2.0
+1. Persists through reboots and firmware updates
+1. Full Docker / Docker Compose compatibility!
+```sh
+$ docker-compose -H 10.0.0.1:2375 up
+Starting minecraft_1 ... done
+Attaching to minecraft_1
+minecraft_1  | [init] Running as uid=1000 gid=1000 with /data as 'drwxrwxr-x 4 1000 1000 240 May 25 11:55 /data'
+minecraft_1  | [init] Resolved version given LATEST into 1.16.5
+minecraft_1  | [init] Resolving type given VANILLA
+minecraft_1  | [init] server.properties already created, skipping
+minecraft_1  | [init] Checking for JSON files.
+minecraft_1  | [init] Setting initial memory to 1G and max to 1G
+minecraft_1  | [init] Starting the Minecraft server...
+```
+## Requirements
+
+1. You have successfully set up the on boot script described [here](https://github.com/boostchicken/udm-utilities/tree/master/on-boot-script)
+
+## Customization
+
+* You can not expose the docker daemon by commenting out the podman service in  [00-podman-update.sh](00-podman-update.sh)
+  
+## Podman Build Process
+* This is a custom-built binary by me.  It was cross compiled on Ubuntu-20.04 in WSL2. 
+* The Makefile needs tweaks. I have supplied the [Makefile.patch](build/Makefile.patch). Apply it to a fresh [podman](https://github.com/containers/podman/) checkout
+* You will need [libseccomp-dev:arm64](build/libseccomp-dev_2.2.3-3ubuntu3_arm64.deb) package installed
+* You will need [go](https://golang.org/doc/install#download) > 1.12.1 installed
+* Setup Cross-Compiler
+```sh
+sudo apt-get install libc6-arm64-cross libc6-dev-arm64-cross binutils-aarch64-linux-gnu libncurses5-dev build-essential bison flex libssl-dev bc gcc-aarch64-linux-gnu
+```
+* Compile
+```sh
+make CC="aarch64-linux-gnu-gcc" local-cross
+```
+## Steps
+
+1. Copy [00-podman-update.sh](00-podman-update.sh) to /mnt/data/on_boot.d
+    1.  Comment out the Podman service if you do not wish to expose the Docker/Podman Daemon
+1. Execute /mnt/data/on_boot.d/[00-podman-update.sh](00-podman-update.sh)
+1. Verify Podman version
+```sh
+$ podman version
+Version:      3.2.0-dev
+API Version:  3.2.0-dev
+Go Version:   go1.16.4
+Git Commit:   78df4f6fb2e2a404ace69219a50652f4335b7ce1-dirty
+Built:        Tue May 25 04:52:19 2021
+OS/Arch:      linux/arm64
+```
+
+## Docker Compose
+There is no docker-compose binary to run on the UDMP yet, so please use docker-compose from a remote system and specify to run on your UDM.
+    
+```docker-compose -H 10.0.0.1:2375 up```
+
+You can also use any regular docker binary and do remote management as well
+```
+$ docker -H 10.0.0.1:2375 ps
+CONTAINER ID   IMAGE                                  COMMAND                  CREATED         STATUS       PORTS     NAMES
+608a24fd121e   localhost/unifi-os:latest              "/sbin/init"             8 weeks ago     Up 8 days              unifi-os
+```

podman-update/build/Makefile.patch

@@ -0,0 +1,39 @@
+diff --git a/Makefile b/Makefile
+index 15d6d9fb6..8b44da6ae 100644
+--- a/Makefile
++++ b/Makefile
+@@ -65,7 +65,7 @@ SOURCES = $(shell find . -path './.*' -prune -o \( -name '*.go' -a ! -name '*_te
+
+ BUILDFLAGS := -mod=vendor $(BUILDFLAGS)
+
+-BUILDTAGS_CROSS ?= containers_image_openpgp exclude_graphdriver_btrfs exclude_graphdriver_devicemapper exclude_graphdriver_overlay
++BUILDTAGS_CROSS ?= containers_image_openpgp exclude_graphdriver_btrfs exclude_graphdriver_devicemapper exclude_graphdriver_overlay seccomp
+ CONTAINER_RUNTIME := $(shell command -v podman 2> /dev/null || echo docker)
+ OCI_RUNTIME ?= ""
+
+@@ -133,16 +133,7 @@ export PATH := $(PATH):$(GOBIN)
+ GOMD2MAN ?= $(shell command -v go-md2man || echo '$(GOBIN)/go-md2man')
+
+ CROSS_BUILD_TARGETS := \
+-	bin/podman.cross.linux.amd64 \
+-	bin/podman.cross.linux.ppc64le \
+-	bin/podman.cross.linux.arm \
+ 	bin/podman.cross.linux.arm64 \
+-	bin/podman.cross.linux.386 \
+-	bin/podman.cross.linux.s390x \
+-	bin/podman.cross.linux.mips \
+-	bin/podman.cross.linux.mipsle \
+-	bin/podman.cross.linux.mips64 \
+-	bin/podman.cross.linux.mips64le
+
+ # Dereference variable $(1), return value if non-empty, otherwise raise an error.
+ err_if_empty = $(if $(strip $($(1))),$(strip $($(1))),$(error Required variable $(1) value is undefined, whitespace, or empty))
+@@ -370,7 +361,7 @@ bin/podman.cross.%: .gopathok
+ 	TARGET="$*"; \
+ 	GOOS="$${TARGET%%.*}"; \
+ 	GOARCH="$${TARGET##*.}"; \
+-	CGO_ENABLED=0 \
++	CGO_ENABLED=1 \
+ 		$(GO) build \
+ 		$(BUILDFLAGS) \
+ 		-gcflags '$(GCFLAGS)' \