Trim the tool dependencies for castled

[bassam]

Oct 13 22:07:02 castle00 rkt[2122]: 2016-10-13 22:07:02.895783 I | Running command: lsblk --all -n -l --output KNAME
Oct 13 22:07:02 castle00 rkt[2122]: 2016-10-13 22:07:02.895985 I | error while discovering hardware: failed to list all devices: Failed to complete lsblk all: exec: "lsblk": executable file not found in $PATH
Oct 13 22:07:02 castle00 rkt[2122]: waiting for ctrl-c interrupt...

[bassam]

I think we need to use cgo to call libblkid to solve this. We already depend on libblkdid via ceph.

[bassam]

As of #83 we now include the following tools in our containers:

RUN apk add --no-cache gptfdisk util-linux kmod coreutils grep gawk e2fsprogs btrfs-progs sudo

I'm repurposing this issue to removing unneeded tools like sudo, grep, gawk, e2fsprogs, btrfs-progs, mod and others. We should really only depend on lsblk and sgdisk for disk operations, and lsblk can be removed if needed.

[bassam]

@travisn after #88 what tools do we still use?

[travisn]

These are the remaining called by the orchestration:

• lsblk
• sgdisk
• df

There are others used by the client tool for mounting, etc.

[travisn]

I believe we could now get this down to two packages:

apk add --no-cache gptfdisk util-linux

[bassam]

Do you want to trim the packages then?

[travisn]

we actually need three packages:

• gptfdisk for sgdisk
• util-linux for lsblk
• coreutils for df

If we need to trim the packages further let's open a separate ticket