https://github.com/artyom/merge-docker-save

Command to export docker image filesystem from the docker save output.
https://github.com/artyom/merge-docker-save

docker export filesystem

Last synced: about 11 hours ago
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Command to export docker image filesystem from the docker save output.

• Host: GitHub
• URL: https://github.com/artyom/merge-docker-save
• Owner: artyom
• License: mit
• Created: 2017-09-16T11:17:42.000Z (about 7 years ago)
• Default Branch: master
• Last Pushed: 2018-05-17T18:07:35.000Z (over 6 years ago)
• Last Synced: 2024-06-20T00:28:26.410Z (5 months ago)
• Topics: docker, export, filesystem
• Language: Go
• Size: 8.79 KB
• Stars: 2
• Watchers: 1
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

        
Command `merge-docker-save` repacks output of the docker save command called for a single image to a tar stream with merged content of all image layers.

Command `docker save` outputs [docker-specific tar stream](https://github.com/moby/moby/blob/master/image/spec/v1.2.md):

	$ docker save alpine:latest | tar tv |head

	drwxr-xr-x 0/0               0 2017-09-13 14:32 030cf30aac0be224d6b7e02ca2b7cadf1d078bf90ef1e9656ff54a924a5f163a/

	-rw-r--r-- 0/0               3 2017-09-13 14:32 030cf30aac0be224d6b7e02ca2b7cadf1d078bf90ef1e9656ff54a924a5f163a/VERSION

	-rw-r--r-- 0/0            1184 2017-09-13 14:32 030cf30aac0be224d6b7e02ca2b7cadf1d078bf90ef1e9656ff54a924a5f163a/json

	-rw-r--r-- 0/0         4220928 2017-09-13 14:32 030cf30aac0be224d6b7e02ca2b7cadf1d078bf90ef1e9656ff54a924a5f163a/layer.tar

	-rw-r--r-- 0/0            1512 2017-09-13 14:32 76da55c8019d7a47c347c0dceb7a6591144d232a7dd616242a367b8bed18ecbc.json

	-rw-r--r-- 0/0             202 1970-01-01 00:00 manifest.json

	-rw-r--r-- 0/0              89 1970-01-01 00:00 repositories

Command `merge-docker-save` transforms this output to produce tar stream with container filesystem:

	$ docker save alpine:latest | merge-docker-save | tar tv |head

	drwxr-xr-x 0/0               0 2017-06-25 17:52 bin/

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/ash -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/base64 -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/bbconfig -> /bin/busybox

	-rwxr-xr-x 0/0          825504 2017-06-11 06:38 bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/cat -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/catv -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/chgrp -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/chmod -> /bin/busybox

	lrwxrwxrwx 0/0               0 2017-06-25 17:52 bin/chown -> /bin/busybox

## Known limits

Command only supports `docker save` output for a single image, i.e. piping `docker save alpine:latest` works, but `docker save alpine` may not if it outputs multiple images.

This tool uses system default directory to store temporary files, which can be overridden by setting `$TMPDIR` environment.