It’s worth noting the snapcraft command also has a pack option which achieves the same as snap pack, but with extra checks, and developer feedback. If we wanted to make something which can reach the network, or monitor system usage, we could specify the plugs in the snap.yaml.
We have specified no plugs, so there will be no interfaces connected with this snap. Running is simple, since we expose the binary to the outside of the snap with the apps stanza in the snap.yaml as tinysnap, so we can just run that.
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$ snap install tinysnap_0_all.snap -dangerous tinysnap 0 installed Specify the -dangerous flag to indicate we accept the risk associated with installing local un-checked packages. Installing the resulting tiny snap is just the same as any other locally installed package. Given 4KiB is the likely smallest allocation unit on disk, I’m not going to stress about the padding in the squashfs file taking it up to that size. We have a small snap! Small is beautiful $ ls -l tinysnap_0_all.snap -rw-r-r- 1 alan alan 4096 Jan 21 10:56 tinysnap_0_all.snapĤ096 bytes is the smallest we can get it down to, even though the script itself is mere tens of bytes in length. We just ship the shell script itself and the metadata in snap.yaml.Īssembling the snap is very straightforward and fast. The core18 snap contains the /bin/bash binary, so no need for us to bundle that inside our tiny snap. This is likely to already be installed on a system which has any snaps installed. We specify core18 as the base, which means the Ubuntu 18.04 LTS-based core18 snap will be required. There’s no bundled dependencies, just the shell script itself. ├── bin │ └── tinysnap.sh └── meta └── snap.yaml 2 directories, 2 files Here’s what that directory structure looks like on the disk.
base: core18 apps: tinysnap: command: bin/tinysnap.sh name: tinysnap version: 0 summary: A very small shell script description: | This shell script is about as simple as they get. The “script” (such that it is) is created as bin/tinysnap.sh, but it could equally be a pre-compiled static binary. Let’s take an example of snapping a very simple shell script using this method. It’s possible to bypass snapcraft completely and create a snap using only the snap.yaml, the snap command and the binaries, scripts, libraries and other assets, which need snapping. The snap.yaml has some similarities to the snapcraft.yaml, but is usually generated by snapcraft, not manually crafted by hand. It is required by the system which receives the snap. The generated snap.yaml is bundled into the snap file in the /meta folder. In the final stages of a snapcraft run, all the assembled components are primed (that is, collated in a folder prior to compression), then compressed into a.
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The snap.yaml contains metadata about the contents of the snap, which is consumed by the Snap Store when published, and by snapd on clients at download and installation time. One of the outputs of the snap build process is the is snap.yaml.
Snapcraft behaviour is controlled by the snapcraft.yaml file. Well, there’s a couple of other interesting ways to build a snap we should look at. Maybe it’s a simple shell or python script, which requires no additional dependencies.
Your program might be a single binary written in a modern language like go or rust. We generally recommend using snapcraft because it helps automate things, and make the snapping process more reliable.īut what if your application has minimal, or no dependencies?. Snapcraft has logic to pull in and stage any required dependencies. Typically in documentation we detail building snaps with the command line tool snapcraft. Furthermore the concept of “shared content” or “platform” snaps allows for common bundles of libraries to be installed only once and then reused across multiple snaps.
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This is offset by the snap being compressed on disk, and the Snap Store delivering delta updates rather than force a full download on each update. This is a by-product of the snap needing to run on any Linux distribution where dependencies cannot always be expected to be installed. A snap might end up being quite bulky if the primary application it contains has many additional dependencies. Snaps are designed to be self-contained packages of binaries, libraries and other assets.