packaging: replace dockerlib.sh with a Python script I want to do some more advanced things with Docker in upcoming commits. Trying to do that with shell scripts will be a bit too painful for my liking. Implementing things in Python will be vastly simpler in the long run. This commit essentially ports dockerlib.sh to a Python script. dockerdeb and dockerrpm have been ported to use the new hg-docker script. hg-docker requires Python 3. I've only tested on Python 3.5. Unlike the local packaging scripts which may need to run on old distros, the Docker packaging scripts don't have these constraints. So I think it is acceptable to require Python 3.5. As part of the transition, the Docker image tags changed slightly. I don't think that's a big deal: the Docker image names are effectively arbitrary and are a means to an end to achieve running commands in Docker containers. The code for resolving the Dockerfile content allows substituting values passed as arguments. This will be used in a subsequent commit. Differential Revision: https://phab.mercurial-scm.org/D3759

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## What is it?

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This extension adds ability to save certain pushes to a remote blob store

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as bundles and to serve commits from remote blob store.

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The revisions are stored on disk or in everstore.

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The metadata are stored in sql or on disk.

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## Config options

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infinitepush.branchpattern: pattern to detect a scratchbranch, example

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                            're:scratch/.+'

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infinitepush.indextype: disk or sql for the metadata

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infinitepush.reponame: only relevant for sql metadata backend, reponame to put in

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                       sql

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infinitepush.indexpath: only relevant for ondisk metadata backend, the path to

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                        store the index on disk. If not set will be under .hg

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                        in a folder named filebundlestore

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infinitepush.storepath: only relevant for ondisk metadata backend, the path to

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                        store the bundles. If not set, it will be

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                        .hg/filebundlestore