From 94ba9b86c726857c9a9ac302232f9c40f2c70155 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?V=C3=A1clav=20Val=C3=AD=C4=8Dek=20=28YCNet=29?=
 <hppro@swamp.ga>
Date: Sat, 10 Feb 2018 00:57:16 +0100
Subject: [PATCH] Launcher image

---
 Makefile                             |  8 +++-
 launcher-image/Dockerfile            | 11 +++++
 launcher-image/src/cron-command      | 39 ++++++++++++++++
 launcher-image/src/entrypoint        | 11 +++++
 launcher-image/src/run-mirror-update | 67 ++++++++++++++++++++++++++++
 5 files changed, 135 insertions(+), 1 deletion(-)
 create mode 100644 launcher-image/Dockerfile
 create mode 100755 launcher-image/src/cron-command
 create mode 100755 launcher-image/src/entrypoint
 create mode 100755 launcher-image/src/run-mirror-update

diff --git a/Makefile b/Makefile
index a406f4a..f890986 100644
--- a/Makefile
+++ b/Makefile
@@ -12,13 +12,19 @@ mirror:
 run-mirror: mirror
 	docker run -v $(VOLUME):/data -it --rm $(TAGBASE)-mirror
 
-# Creator - ./creator dir
+# Creator - ./creator-image dir
 creator:
 	docker build -t $(TAGBASE)-creator ./creator-image
 
 run-creator: creator
 	docker run -v /var/run/docker.sock:/var/run/docker.sock -it --rm $(TAGBASE)-creator
 
+# Launcher - ./launcher-image
+launcher:
+	docker build -t $(TAGBASE)-launcher ./launcher-image
+
+run-launcher: launcher
+	docker run -v /var/run/docker.sock:/var/run/docker.sock -it --rm $(TAGBASE)-launcher
 
 # wizzard
 wizzard: mirror run-creator 
diff --git a/launcher-image/Dockerfile b/launcher-image/Dockerfile
new file mode 100644
index 0000000..20277f6
--- /dev/null
+++ b/launcher-image/Dockerfile
@@ -0,0 +1,11 @@
+# Alpine base image
+FROM alpine:edge
+
+RUN apk add --no-cache bash docker parallel ; \
+	echo "*	*	*	*	*	/bin/cron-command" >> /etc/crontabs/root
+
+ADD src/* /bin/
+
+CMD [ "/bin/entrypoint" ]
+
+
diff --git a/launcher-image/src/cron-command b/launcher-image/src/cron-command
new file mode 100755
index 0000000..c2c466a
--- /dev/null
+++ b/launcher-image/src/cron-command
@@ -0,0 +1,39 @@
+#!/bin/bash
+set -euo pipefail
+IFS=$'\n\t'
+
+# trap
+lock=/var/run/cloner.pid
+
+volume_prefix=cloner
+clone_prefix=cloner-runner
+
+
+function die(){
+	echo $@ 1>&2
+	exit 1
+}
+
+# first, check process
+if [ -f $lock ] 
+then
+	pid=$(cat $lock)
+	# if it still runs, die not so quietly
+	[ -d /proc/$pid ] && die "Another process running!"
+fi
+# else make some mess and setup trap
+echo $BASHPID > $lock
+function finish {
+  rm -rf $lock
+}
+trap finish EXIT
+
+
+# declare functions
+function listVolumes(){
+	docker volume ls --filter=name=$volume_prefix- --quiet
+}
+
+# run for every volume in parallel
+listVolumes | parallel --lb -j 3 -n 1 --progress run-mirror-update
+
diff --git a/launcher-image/src/entrypoint b/launcher-image/src/entrypoint
new file mode 100755
index 0000000..39e8d52
--- /dev/null
+++ b/launcher-image/src/entrypoint
@@ -0,0 +1,11 @@
+#!/bin/bash
+set -euo pipefail
+IFS=$'\n\t'
+
+# make parallel citation shut up
+mkdir $HOME/.parallel
+touch $HOME/.parallel/will-cite
+
+# run cron
+crond -f 
+
diff --git a/launcher-image/src/run-mirror-update b/launcher-image/src/run-mirror-update
new file mode 100755
index 0000000..76a42a2
--- /dev/null
+++ b/launcher-image/src/run-mirror-update
@@ -0,0 +1,67 @@
+#!/bin/bash
+set -euo pipefail
+IFS=$'\n\t'
+
+mirror_image="valicek1/repo-cloner-mirror"
+
+
+function log(){
+	local title=${raw:-$name}
+	[ -z "$title" ] || title=" [$title]"
+	echo "[$(date +"%X")]$title $@"
+}
+
+function die(){
+	log "$@" 1>&2
+	exit 1
+}
+
+
+scratch=$(mktemp -d -t tmp.XXXXXXXXXX)
+function finish {
+  rm -rf "$scratch"
+}
+trap finish EXIT
+
+volume_prefix=cloner
+clone_prefix=cloner-runner
+
+name=${1:-}
+[ -n "$name" ] || die "No volume specified"
+
+# contains prefix
+[[ "$name" == $volume_prefix-* ]] || die "Volume name does not contain prefix!"
+
+raw=$(echo $name | sed "s/^$volume_prefix-//g")
+
+container_name=$clone_prefix-$raw
+
+# does it run?
+docker ps --quiet --no-trunc --filter name=^/$container_name$ > $scratch/running
+lines=$(wc -l $scratch/running | cut -f1 -d' ')
+
+if ! [ $lines -eq 0 ] 
+then
+	log "Another copy of container is running.. Exiting silently"
+	exit 0
+fi
+unset lines
+
+# does it exist?
+docker ps --quiet -a --no-trunc --filter name=^/$container_name$ > $scratch/existing
+lines=$(wc -l $scratch/existing | cut -d' ' -f1)
+
+if ! [ $lines -eq 0 ] 
+then
+	log "Conflicting container exists, removing.."
+	docker rm $(cat $scratch/existing)
+fi
+
+unset lines
+
+# does volume exist?
+docker volume inspect $name > /dev/null 2>&1 || die "Volume '$name' does not exist - exiting!"
+
+log "Running container of update process..."
+docker run -v $name:/data --name $container_name --rm $mirror_image | while read line; do log "$line"; done
+log "Finished."