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Execute commands in a container

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This commit is contained in:
Chris F Ravenscroft 2015-07-22 20:57:59 -07:00
parent 39ebf616c4
commit d4b9247f14
1 changed files with 33 additions and 48 deletions
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bocker
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@ -1,20 +1,13 @@
#!/usr/bin/env bash
set -o errexit -o nounset -o pipefail; shopt -s nullglob
btrfs_path='/var/bocker';
function CHECK() {
[[ "$1" == 'img' ]] && TYPE='image'
[[ "$1" == 'ps' ]] && TYPE='container'
[[ "$1" == '' ]] && TYPE='container or image'
if [[ "$2" == "$1"* ]]; then
if btrfs subvolume list "$btrfs_path" | grep -qw "$2"; then
return 0
fi
fi
echo "No $TYPE named '$2' exists" && exit 1
function bocker_check() {
btrfs subvolume list "$btrfs_path" | grep -qw "$1" && echo 0 || echo 1
}
function INIT() {
function bocker_init() { #HELP Create an image:\nBOCKER init <image_directory>
uuid="img_$(shuf -i 42002-42254 -n 1)"
if [[ -d "$1" ]]; then
uuid="img_$(shuf -i 10000-99999 -n 1)"
[[ "$(bocker_check "$uuid")" == 0 ]] && bocker_run "$@"
btrfs subvolume create "$btrfs_path/$uuid" > /dev/null
cp -rf --reflink=auto "$1"/* "$btrfs_path/$uuid" > /dev/null
echo "Created: $uuid"
@ -22,75 +15,67 @@ else
echo "No directory named '$1' exists"
fi
}
function RM() {
CHECK '' "$1"
function bocker_rm() { #HELP Delete an image or container:\nBOCKER rm <image_id or container_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
btrfs subvolume delete "$btrfs_path/$1" > /dev/null
echo "Removed: $1"
}
function IMAGES() {
function bocker_images() { #HELP List images:\nBOCKER images
echo -e "IMAGE_ID"
for img in "$btrfs_path"/img_*; do
basename "$img"
done
}
function PS() {
function bocker_ps() { #HELP List containers:\nBOCKER ps
echo -e "CONTAINER_ID\t\tCOMMAND"
for ps in "$btrfs_path"/ps_*; do
ps=$(basename "$ps")
echo -e "$ps\t\t$(cat "$btrfs_path/$ps/$ps.cmd")"
done
}
function RUN() {
CHECK 'img' "$1"
uuid="ps_$(shuf -i 10000-99999 -n 1)"
function bocker_run() { #HELP Create a container:\nBOCKER run <image_id> <command
uuid="ps_$(shuf -i 42002-42254 -n 1)"
[[ "$(bocker_check "$1")" == 1 ]] && echo "No image named '$1' exists" && exit 1
[[ "$(bocker_check "$uuid")" == 0 ]] && echo "UUID conflict, retrying..." && bocker_run "$@" && return
cmd=${@:2} && ip="$(echo "${uuid: -3}" | sed 's/0//g')" && mac="${uuid: -3:1}:${uuid: -2}"
ip link add dev veth0_"$uuid" type veth peer name veth1_"$uuid"
ip link set dev veth0_"$uuid" up
ip link set veth0_"$uuid" master bridge0
ip netns add netns_"$uuid"
ip link set veth1_"$uuid" netns netns_"$uuid"
ip netns exec netns_"$uuid" ip link set dev lo up
ip netns exec netns_"$uuid" ip addr add 10.0.0.2/24 dev veth1_"$uuid"
ip netns exec netns_"$uuid" ip link set veth1_"$uuid" address 02:42:ac:11:00"$mac"
ip netns exec netns_"$uuid" ip addr add 10.0.0."$ip"/24 dev veth1_"$uuid"
ip netns exec netns_"$uuid" ip link set dev veth1_"$uuid" up
ip netns exec netns_"$uuid" ip route add default via 10.0.0.1
btrfs subvolume snapshot "$btrfs_path/$1" "$btrfs_path/$uuid" > /dev/null
echo 'nameserver 8.8.8.8' > "$btrfs_path/$uuid"/etc/resolv.conf
echo "$2" > "$btrfs_path/$uuid/$uuid.cmd"
echo "$cmd" > "$btrfs_path/$uuid/$uuid.cmd"
ip netns exec netns_"$uuid" "unshare" -fp --mount-proc "chroot" \
"$btrfs_path/$uuid" /bin/sh -c "/bin/mount -t proc proc /proc && $2" \
"$btrfs_path/$uuid" /bin/sh -c "/bin/mount -t proc proc /proc && $cmd" \
2>&1 | tee "$btrfs_path/$uuid/$uuid.log" || true
ip link del dev veth0_"$uuid"
ip netns del netns_"$uuid"
}
function LOGS() {
CHECK 'ps' "$1"
function bocker_exec() { #HELP Run bash (default) or comnmands in a container:\nBOCKER exec <container_id> <command
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
cmd=${@:2} && CID=$(ps xao ppid,pid,cmd | grep $(ps -u | grep unshare | grep "$1" | awk '{ print $2 }') | grep -v unshare | awk '{ print $2 }') && nsenter --target $CID --mount --uts --ipc --net --pid chroot "$btrfs_path/$1" $cmd
}
function bocker_logs() { #HELP View logs from a container:\nBOCKER logs <container_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
cat "$btrfs_path/$1/$1.log"
}
function COMMIT() {
CHECK 'ps' "$1" && CHECK 'img' "$2" && RM "$2"
btrfs subvolume snapshot "$btrfs_path/$1" "$btrfs_path/$2" > /dev/null
function bocker_commit() { #HELP Commit a container to an image:\nBOCKER commit <container_id> <image_id>
[[ "$(bocker_check "$1")" == 1 ]] && echo "No container named '$1' exists" && exit 1
[[ "$(bocker_check "$2")" == 1 ]] && echo "No image named '$1' exists" && exit 1
bocker_rm "$2" && btrfs subvolume snapshot "$btrfs_path/$1" "$btrfs_path/$2" > /dev/null
echo "Created: $2"
}
function HELP() {
echo -e "Create an image: \n\t./bocker init <image_directory>\n"
echo -e "List images: \n\t./bocker images\n"
echo -e "Create a container: \n\t./bocker run <image_id> <command>\n"
echo -e "List containers: \n\t./bocker ps\n"
echo -e "View logs from a container: \n\t./bocker logs <container_id>\n"
echo -e "Delete an image or container: \n\t./bocker rm <image_or_container_id>"
exit 0
function bocker_help() { #HELP Display this message:\nBOCKER help
sed -n "s/^.*#HELP\\s//p;" < "$1" | sed "s/\\\\n/\n\t/g;s/$/\n/;s!BOCKER!${1/!/\\!}!g"
}
[[ -z "${1-}" ]] && HELP
[[ -z "${1-}" ]] && bocker_help "$0"
case $1 in
init) INIT "$2" ;;
rm) RM "$2" ;;
images) IMAGES ;;
ps) PS ;;
run)
IMAGE="$2"
shift && shift
RUN "$IMAGE" "$*"
;;
logs) LOGS "$2" ;;
commit) COMMIT "$2" "$3" ;;
*) HELP ;;
init|rm|images|ps|run|exec|logs|commit) bocker_"$1" "${@:2}" ;;
*) bocker_help "$0" ;;
esac