Snap Guide.txt

## https://docs.snapcraft.io/build-snaps/get-started-snapcraft
##

# install snapd
sudo apt-get install snapd

# install snapcraft
sudo snap install snapcraft --classic

# check version of snapcraft
snapcraft --version

# install lxd
sudo snap install lxd
sudo lxd init
sudo usermod -g lxd ${USER}

# login again
.....

# test lxd
lxc launch ubuntu:16.04 test

# test a container build
mkdir test-snapcraft
cd test-snapcraft
snapcraft init
snapcraft cleanbuild

###### HELLO WORLD APP
######################

# grade and confinement
grade: stable
confinement: strict

# app
apps:
  hello:
    command: hello

# part
parts:
  gnu-hello:
    plugin: autotools
    source: http://ftp.gnu.org/gnu/hello/hello-2.10.tar.gz

######################
######################

# install snap
# dangerous is used because it is not signed!
sudo snap install hello_2.10_*.snap --dangerous

###################################################################

# run snapcraft from docker
sudo docker pull snapcore/snapcraft
sudo docker run -v $PWD:$PWD -w $PWD snapcore/snapcraft snapcraft

# grade
grade: stable or devel

# confinement
# if strict security policies should be enforced
confinement: strict or devmode or classic
### NOTE:
### to install devmode, append "--devmode" to CLI
### sudo snap install python36_3.6.4_amd64.snap --dangerous --devmode
### NOTE:
### to install classic confinement, append "--classic" to CLI
### sudo snap install python36_3.6.4_amd64.snap --dangerous --classic

# list snap interfaces
snap interfaces

# debug confinement
# app must be in devmode
sudo snap install snappy-debug
sudo /snap/bin/snappy-debug.security scanlog

### Environment variables

SNAP: /snap/hello-world/27
SNAP_COMMON: /var/snap/hello-world/common
SNAP_DATA: /var/snap/hello-world/27
SNAP_USER_COMMON: /home/zyga/snap/hello-world/common
SNAP_USER_DATA: /home/zyga/snap/hello-world/27