Generate V2 Manifest from a tarball
$ go build github.com/shaded-enmity/docker-manifest
$ docker save -o busybox.tar busybox:latest
$ docker-manifest busybox.tar
{
"schemaVersion": 1,
"name": "library/busybox",
"tag": "latest",
"architecture": "amd64",
"fsLayers": [
{
"blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
},
{
"blobSum": "sha256:1db09adb5ddd7f1a07b6d585a7db747a51c7bd17418d47e91f901bdf420abd66"
},
{
"blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
}
],
"history": [
{
"v1Compatibility": "{\"id\":\"8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55\",\"parent\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"created\":\"2015-04-17T22:01:13.062208605Z\",\"container\":\"811003e0012ef6e6db039bcef852098d45cf9f84e995efb93a176a11e9aca6b9\",\"container_config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) CMD [\\\"/bin/sh\\\"]\"],\"Image\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\"],\"Image\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
},
{
"v1Compatibility": "{\"id\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"parent\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"created\":\"2015-04-17T22:01:12.62756842Z\",\"container\":\"19bbb9ebab4da181db898c79bbdd8d2a8010dc2e4a7dc8b1a24d4b5eff99c5b4\",\"container_config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) ADD file:8cf517d90fe79547c474641cc1e6425850e04abbd8856718f7e4a184ea878538 in /\"],\"Image\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":null,\"Image\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":2429728}\n"
},
{
"v1Compatibility": "{\"id\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"created\":\"2015-04-17T22:01:05.451579326Z\",\"container\":\"39e791194498a7ee0c10e290ef51dd1ecde1f0fd83db977ddae38910b02b6fb9\",\"container_config\":{\"Hostname\":\"39e791194498\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) MAINTAINER Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\"],\"Image\":\"\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":null},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"39e791194498\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":null,\"Image\":\"\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":null},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
}
]
}
What this means is that the manifest is 99.9% same as the one you'd obtain by pushing the image to the registry.
The problem is that Docker/Distribution somewhat mangles the layer size on push. For comparison, here's manifest as obtained by pushing into the registry.
Notice that the size of the middle layer here is 2433303 while docker-manifest outputs 2429728.
Needless to say that the actual size of the layer.tar is really 2429728.
I'll investigate why this happens later on, if anyone has some information please contact me.
{
"schemaVersion": 1,
"name": "library/busybox",
"tag": "latest",
"architecture": "amd64",
"fsLayers": [
{
"blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
},
{
"blobSum": "sha256:1db09adb5ddd7f1a07b6d585a7db747a51c7bd17418d47e91f901bdf420abd66"
},
{
"blobSum": "sha256:a3ed95caeb02ffe68cdd9fd84406680ae93d633cb16422d00e8a7c22955b46d4"
}
],
"history": [
{
"v1Compatibility": "{\"id\":\"8c2e06607696bd4afb3d03b687e361cc43cf8ec1a4a725bc96e39f05ba97dd55\",\"parent\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"created\":\"2015-04-17T22:01:13.062208605Z\",\"container\":\"811003e0012ef6e6db039bcef852098d45cf9f84e995efb93a176a11e9aca6b9\",\"container_config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) CMD [\\\"/bin/sh\\\"]\"],\"Image\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\"],\"Image\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
},
{
"v1Compatibility": "{\"id\":\"6ce2e90b0bc7224de3db1f0d646fe8e2c4dd37f1793928287f6074bc451a57ea\",\"parent\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"created\":\"2015-04-17T22:01:12.62756842Z\",\"container\":\"19bbb9ebab4da181db898c79bbdd8d2a8010dc2e4a7dc8b1a24d4b5eff99c5b4\",\"container_config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) ADD file:8cf517d90fe79547c474641cc1e6425850e04abbd8856718f7e4a184ea878538 in /\"],\"Image\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"19bbb9ebab4d\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":null,\"Image\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":{}},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":2433303}\n"
},
{
"v1Compatibility": "{\"id\":\"cf2616975b4a3cba083ca99bc3f0bf25f5f528c3c52be1596b30f60b0b1c37ff\",\"created\":\"2015-04-17T22:01:05.451579326Z\",\"container\":\"39e791194498a7ee0c10e290ef51dd1ecde1f0fd83db977ddae38910b02b6fb9\",\"container_config\":{\"Hostname\":\"39e791194498\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":[\"/bin/sh\",\"-c\",\"#(nop) MAINTAINER Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\"],\"Image\":\"\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":null},\"docker_version\":\"1.6.0\",\"author\":\"Jérôme Petazzoni \\u003cjerome@docker.com\\u003e\",\"config\":{\"Hostname\":\"39e791194498\",\"Domainname\":\"\",\"User\":\"\",\"AttachStdin\":false,\"AttachStdout\":false,\"AttachStderr\":false,\"ExposedPorts\":null,\"PublishService\":\"\",\"Tty\":false,\"OpenStdin\":false,\"StdinOnce\":false,\"Env\":null,\"Cmd\":null,\"Image\":\"\",\"Volumes\":null,\"VolumeDriver\":\"\",\"WorkingDir\":\"\",\"Entrypoint\":null,\"NetworkDisabled\":false,\"MacAddress\":\"\",\"OnBuild\":null,\"Labels\":null},\"architecture\":\"amd64\",\"os\":\"linux\",\"Size\":0}\n"
}
]
}