#!/bin/bash


#!-
. /etc/shlib
#!-


DOCKER_UPDATE_PATH=${DOCKER_UPDATE_PATH:-/srv/docker-builder}
KEEP_ONLY_PO="fr en de"


include common
include pretty
ansi_color no
usage="$exname COMPONENT MASTER_IMAGE_NAME BRANCH UPDATED_IMAGE_NAME"

COMPONENT_NAME="$1"
MASTER_IMAGE_NAME="$2"
BRANCH="$3"
UPDATED_IMAGE_NAME="$4"

## Note: we will need in the DOCKER_UPDATE_HOST:
##  - git-sub

## should we check for aufs ?

mkdir -p "$DOCKER_UPDATE_PATH"
cd "$DOCKER_UPDATE_PATH"
if ! [ -d "$COMPONENT_NAME" ]; then
   echo "ERROR: repository $DOCKER_UPDATE_PATH/$COMPONENT_NAME is not existent."
   echo "You should build it on this host prior to run this hook."
   echo "As a remainder: this host is supposed to keep the reference git that"
   echo "was used to built the master image."
   exit 1
fi

lock=$DOCKER_UPDATE_PATH/$COMPONENT_NAME.lock
if [ -e "$lock" ]; then
   echo "Master is being updated."
   echo "Or '$lock' file was left dangling over."
   exit 1
fi
touch "$lock"

## This path is on the docker HOST !
AUFS_APPLY_PATH=${AUFS_APPLY_PATH:-/opt/apps/aufs_apply/bin/aufs_apply}

md5() {
    find "$@" -type f -exec md5sum {} \; 2>/dev/null | md5sum | cut -f 1 -d " "
}


clean_all() {
   cd /
   mountpoint "$tmpdir_root" 2>/dev/null && umount "$tmpdir_root"
   [ -d "$tmpdir_root" ] && rmdir "$tmpdir_root"
   [ -d "$tmpdir_changes" ] && rm -rf "$tmpdir_changes"
   rm "$lock"
}

tmpdir="$DOCKER_UPDATE_PATH"/tmp
mkdir -p "$tmpdir"
tmpdir_changes=$(mktemp -d $tmpdir/$COMPONENT_NAME.changes.XXXXXX)
tmpdir_root=$(mktemp -d $tmpdir/$COMPONENT_NAME.root.XXXXXX)
trap "clean_all" EXIT
mount -t aufs -o br=$tmpdir_changes:$DOCKER_UPDATE_PATH/$COMPONENT_NAME -o udba=none  none "$tmpdir_root"
cd "$tmpdir_root"
## XXXvlab: We probably would need to:
##   - fetch only the module concerned
##   - fetch only the ref concerned
Wrap -d "Update source code" <<EOF
git fetch origin "$BRANCH"
git checkout "$BRANCH"
git reset --hard origin/$BRANCH
#git reset --hard "origin/$BRANCH"
git sub update
EOF

cd / &&
umount "$tmpdir_root" &&
rmdir "$tmpdir_root"
if [ "$?" != 0 ]; then
    echo "Uh oh... could not umount aufs $tmpdir_root or delete it."
    exit 1
fi
cd "$tmpdir_changes"

Wrap -d "Cleaning the change layer." <<EOF
find  . -name .git -type d -exec  rm -rf {} \; -prune

if [ "$KEEP_ONLY_PO" ]; then
    find_args=""
    for lang in $KEEP_ONLY_PO; do
        find_args="\$find_args -not -name \$lang.po"
    done

    find /opt/apps -name \*.po -type f \$find_args -delete
fi
EOF

## XXXvlab: if we produced it we shouldn't have to pull it
#
#echo "Pulling $MASTER_IMAGE_NAME"
#docker pull "$MASTER_IMAGE_NAME" || exit 1
docker tag "$MASTER_IMAGE_NAME" "$UPDATED_IMAGE_NAME"
Elt "Updating $MASTER_IMAGE_NAME"
print_info $(cat <<EOF | docker-update "$UPDATED_IMAGE_NAME" -v "$tmpdir_changes:/mnt/changes" -v "$AUFS_APPLY_PATH:/usr/bin/aufs_apply"
## Applying changes: $(cd "$tmpdir_changes" ; md5 ".")
/usr/bin/aufs_apply /opt/apps/0k-oe /mnt/changes
EOF
)
Feedback || exit 1

Wrap -d "Push new $YELLOW$UPDATED_IMAGE_NAME$NORMAL to registry" docker push "$UPDATED_IMAGE_NAME"