[FEAT] Add container filesystem size capability

[rick]

This is currently only close to working (or so I think). It adds a new "filesystem" capability, uses ContainerList with a container id filter to retrieve information about our specific container, and then extracts the SizeRW and SizeRootFs data.

todo

• build basic capability
• track down how to get info on a specific container
• extract FS sizes
• fix a bug(?) -- FS sizes always appear to be 0

---

The only downside is that these two values are always 0 so far. I'm seeing docker ps with the -s flag returning size information:

CONTAINER ID                                                       IMAGE                                                          COMMAND                                                                                              CREATED             STATUS              PORTS                    NAMES                                                            SIZE
9b2e43a432b1884823fbc08e37cabf13ea143de2fd80af57e245ccbb0f0a4662   dockercomposefortesting_jenkins                                "/usr/bin/dumb-init -- mvn hpi:run"                                                                  About an hour ago   Created                                      dockercomposefortesting_jenkins_1                                0 B (virtual 1.56 GB)
9d7cb1822ae0a37a22442bc42111cb4290068bb5904136432192a2bc2d4aa32a   dockercomposefortesting_always-be-scheduling-queue-processor   "/bin/sh -c 'bundle exec queue-processor'"                                                           About an hour ago   Up About an hour                             dockercomposefortesting_always-be-scheduling-queue-processor_1   1.67 MB (virtual 350 MB)
41635ddc76a574026a2888c11ac016539b84caa9da86010f899106abd0746225   dockercomposefortesting_always-be-scheduling                   "/bin/sh -c 'bundle exec rackup config.ru'"                                                          About an hour ago   Up About an hour    0.0.0.0:9292->9292/tcp   dockercomposefortesting_always-be-scheduling_1                   1.67 MB (virtual 350 MB)
6fd42069baa1d364f862900390ac5f147a833cfc142c00519f32ecd550322d69   dockercomposefortesting_redis                                  "/usr/bin/dumb-init -- /usr/bin/redis-server /etc/redis/redis.conf"                                  About an hour ago   Up About an hour    0.0.0.0:6379->6379/tcp   dockercomposefortesting_redis_1                                  1.84 kB (virtual 178 MB)
6c2ef95354ffb977356c109c2d86881af7e38f57fec73806a327502120c9c962   peopleperhour/dynamodb                                         "/usr/bin/java -Djava.library.path=. -jar DynamoDBLocal.jar -dbPath /var/dynamodb_local -sharedDb"   11 days ago         Up 11 days          0.0.0.0:8000->8000/tcp   dynamodb                                                         32.8 kB (virtual 331 MB)

The information begin returned by the capability has the two size entries set to 0:

lumogon scan --debug 2>&1 | grep -i sizerw
[lumogon] 2017/05/30 21:35:22.912838 [Filesystem] ([]types.Container)[{ID:(string)6c2ef95354ffb977356c109c2d86881af7e38f57fec73806a327502120c9c962 Names:([]string)[/dynamodb] Image:(string)peopleperhour/dynamodb ImageID:(string)sha256:e181bb615ecd45b568be3eb057089b0fac538e696d4cba66f253428a1a532825 Command:(string)/usr/bin/java -Djava.library.path=. -jar DynamoDBLocal.jar -dbPath /var/dynamodb_local -sharedDb Created:(int64)1495225277 Ports:([]types.Port)[{IP:(string)0.0.0.0 PrivatePort:(uint16)8000 PublicPort:(uint16)8000 Type:(string)tcp}] SizeRw:(int64)0 SizeRootFs:(int64)0 Labels:(map[string]string)map[] State:(string)running Status:(string)Up 11 days HostConfig:(struct { NetworkMode string "json:\",omitempty\"" }){NetworkMode:(string)default} NetworkSettings:(*types.SummaryNetworkSettings)(0xc4202e42c8){Networks:(map[string]*network.EndpointSettings)map[bridge:<*>(0xc4202f89c0){IPAMConfig:(*network.EndpointIPAMConfig)<nil> Links:([]string)<nil> Aliases:([]string)<nil> NetworkID:(string)e42f575f257f3f4324faa1c04bed0c76070280eb1d310dca179fa8b734e3c915 EndpointID:(string)a0cabb90c3b67d128ba51ae34cef6d0e87066cde51b5158e5023dcf5452c7bc0 Gateway:(string)172.17.0.1 IPAddress:(string)172.17.0.2 IPPrefixLen:(int)16 IPv6Gateway:(string) GlobalIPv6Address:(string) GlobalIPv6PrefixLen:(int)0 MacAddress:(string)02:42:ac:11:00:02}]} Mounts:([]types.MountPoint)[{Type:(mount.Type)volume Name:(string)c05b94b4e988d634f005fe92884eb656d5c757e7ddd11d0b5d17f8bf889bdd56 Source:(string)/var/lib/docker/volumes/c05b94b4e988d634f005fe92884eb656d5c757e7ddd11d0b5d17f8bf889bdd56/_data Destination:(string)/var/dynamodb_wd Driver:(string)local Mode:(string) RW:(bool)true Propagation:(mount.Propagation)} {Type:(mount.Type)volume Name:(string)3ab60ba696f5330609d5f4721fb9f4124615b6441d82af61d42c67c2310f2e60 Source:(string)/var/lib/docker/volumes/3ab60ba696f5330609d5f4721fb9f4124615b6441d82af61d42c67c2310f2e60/_data Destination:(string)/var/dynamodb_local Driver:(string)local Mode:(string) RW:(bool)true Propagation:(mount.Propagation)}]}]
[lumogon] 2017/05/30 21:35:22.912885 [Filesystem]   Output: map[sizerw:0 sizerootfs:0]
[lumogon] 2017/05/30 21:35:22.913180 [Filesystem] ([]types.Container)[{ID:(string)6fd42069baa1d364f862900390ac5f147a833cfc142c00519f32ecd550322d69 Names:([]string)[/dockercomposefortesting_redis_1] Image:(string)dockercomposefortesting_redis ImageID:(string)sha256:55558e8fe39a0990f6e6f10293ab9cc3311781cc249c87990107602ee7013fa8 Command:(string)/usr/bin/dumb-init -- /usr/bin/redis-server /etc/redis/redis.conf Created:(int64)1496176536 Ports:([]types.Port)[{IP:(string)0.0.0.0 PrivatePort:(uint16)6379 PublicPort:(uint16)6379 Type:(string)tcp}] SizeRw:(int64)0 SizeRootFs:(int64)0 Labels:(map[string]string)map[com.docker.compose.config-hash:206705373d5d1aec9cf00ae0825218792863c9fb35851ae50f7f2dbdc2154c1a com.docker.compose.container-number:1 com.docker.compose.oneoff:False com.docker.compose.project:dockercomposefortesting com.docker.compose.service:redis com.docker.compose.version:1.11.2] State:(string)running Status:(string)Up 59 minutes HostConfig:(struct { NetworkMode string "json:\",omitempty\"" }){NetworkMode:(string)dockercomposefortesting_default} NetworkSettings:(*types.SummaryNetworkSettings)(0xc42000ce50){Networks:(map[string]*network.EndpointSettings)map[dockercomposefortesting_default:<*>(0xc4200c8b40){IPAMConfig:(*network.EndpointIPAMConfig)<nil> Links:([]string)<nil> Aliases:([]string)<nil> NetworkID:(string)d703c2a7bbddb8d78b4cdced842602bcb4a1a13c5b65509857e641b04f94701d EndpointID:(string)9dcbfaf82852ec0e1f13f060c7fbaf618b08e8c5953a9b8c3278a87478f10d24 Gateway:(string)172.18.0.1 IPAddress:(string)172.18.0.2 IPPrefixLen:(int)16 IPv6Gateway:(string) GlobalIPv6Address:(string) GlobalIPv6PrefixLen:(int)0 MacAddress:(string)02:42:ac:12:00:02}]} Mounts:([]types.MountPoint)[{Type:(mount.Type)volume Name:(string)2b93bd8e7154a10efea302fa3614f36393e500c2ee163825177dce25cb9bbc1d Source:(string)/var/lib/docker/volumes/2b93bd8e7154a10efea302fa3614f36393e500c2ee163825177dce25cb9bbc1d/_data Destination:(string)/data Driver:(string)local Mode:(string) RW:(bool)true Propagation:(mount.Propagation)}]}]
[lumogon] 2017/05/30 21:35:22.913195 [Filesystem]   Output: map[sizerw:0 sizerootfs:0]
[lumogon] 2017/05/30 21:35:22.914109 [Filesystem] ([]types.Container)[{ID:(string)9d7cb1822ae0a37a22442bc42111cb4290068bb5904136432192a2bc2d4aa32a Names:([]string)[/dockercomposefortesting_always-be-scheduling-queue-processor_1] Image:(string)dockercomposefortesting_always-be-scheduling-queue-processor ImageID:(string)sha256:575e13cee8a33788c41317f4a787fe20d2922ad84f58a361836f0238d3e2e7f1 Command:(string)/bin/sh -c 'bundle exec queue-processor' Created:(int64)1496176537 Ports:([]types.Port)[] SizeRw:(int64)0 SizeRootFs:(int64)0 Labels:(map[string]string)map[name:CentOS Base Image com.docker.compose.config-hash:3e578edd3d82fa8c2471f8f48b51072beb02f76fafccd6b054c5b35f0f2e463d com.docker.compose.service:always-be-scheduling-queue-processor license:GPLv2 com.docker.compose.project:dockercomposefortesting com.docker.compose.version:1.11.2 vendor:CentOS build-date:20160729 com.docker.compose.container-number:1 com.docker.compose.oneoff:False] State:(string)running Status:(string)Up 59 minutes HostConfig:(struct { NetworkMode string "json:\",omitempty\"" }){NetworkMode:(string)dockercomposefortesting_default} NetworkSettings:(*types.SummaryNetworkSettings)(0xc42000cee8){Networks:(map[string]*network.EndpointSettings)map[dockercomposefortesting_default:<*>(0xc4200c8cc0){IPAMConfig:(*network.EndpointIPAMConfig)<nil> Links:([]string)<nil> Aliases:([]string)<nil> NetworkID:(string)d703c2a7bbddb8d78b4cdced842602bcb4a1a13c5b65509857e641b04f94701d EndpointID:(string)11b846f33214fa81e2280f14a86900520b298f6923a28509a29f5b39699aaf2b Gateway:(string)172.18.0.1 IPAddress:(string)172.18.0.4 IPPrefixLen:(int)16 IPv6Gateway:(string) GlobalIPv6Address:(string) GlobalIPv6PrefixLen:(int)0 MacAddress:(string)02:42:ac:12:00:04}]} Mounts:([]types.MountPoint)[]}]
[lumogon] 2017/05/30 21:35:22.914132 [Filesystem]   Output: map[sizerw:0 sizerootfs:0]
[lumogon] 2017/05/30 21:35:22.915309 [Filesystem] ([]types.Container)[{ID:(string)41635ddc76a574026a2888c11ac016539b84caa9da86010f899106abd0746225 Names:([]string)[/dockercomposefortesting_always-be-scheduling_1] Image:(string)dockercomposefortesting_always-be-scheduling ImageID:(string)sha256:3128fb35b1911596bb41ba892976578c5f9761d73f8c6fd58a46d4bff575dfdc Command:(string)/bin/sh -c 'bundle exec rackup config.ru' Created:(int64)1496176537 Ports:([]types.Port)[{IP:(string)0.0.0.0 PrivatePort:(uint16)9292 PublicPort:(uint16)9292 Type:(string)tcp}] SizeRw:(int64)0 SizeRootFs:(int64)0 Labels:(map[string]string)map[license:GPLv2 name:CentOS Base Image com.docker.compose.service:always-be-scheduling com.docker.compose.version:1.11.2 vendor:CentOS build-date:20160729 com.docker.compose.config-hash:6ca05b82d3c33b452a22a786658bb2772f5ed7b22d39bbe454c21d2a5e14f24c com.docker.compose.container-number:1 com.docker.compose.oneoff:False com.docker.compose.project:dockercomposefortesting] State:(string)running Status:(string)Up 59 minutes HostConfig:(struct { NetworkMode string "json:\",omitempty\"" }){NetworkMode:(string)dockercomposefortesting_default} NetworkSettings:(*types.SummaryNetworkSettings)(0xc4202e42e0){Networks:(map[string]*network.EndpointSettings)map[dockercomposefortesting_default:<*>(0xc4202f8a80){IPAMConfig:(*network.EndpointIPAMConfig)<nil> Links:([]string)<nil> Aliases:([]string)<nil> NetworkID:(string)d703c2a7bbddb8d78b4cdced842602bcb4a1a13c5b65509857e641b04f94701d EndpointID:(string)62e08ea0edbc4c46291f9f5c252ac25eeb3d25a49557c822fd376a2ca588fd5c Gateway:(string)172.18.0.1 IPAddress:(string)172.18.0.3 IPPrefixLen:(int)16 IPv6Gateway:(string) GlobalIPv6Address:(string) GlobalIPv6PrefixLen:(int)0 MacAddress:(string)02:42:ac:12:00:03}]} Mounts:([]types.MountPoint)[]}]
[lumogon] 2017/05/30 21:35:22.915370 [Filesystem]   Output: map[sizerw:0 sizerootfs:0]

cc @puppetlabs/lumogon