2013-11-24 05:10:45 +00:00
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The assistant should support upgrading itself.
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## non-distro upgrades
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When git-annex was installed from this website, the assistant should poll
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periodically (once a day or so) to see if there is a new version.
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It downloads, over https, a .info file, which contains a serialized data
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type containing upgrade information. The url it's downloaded from is
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configured by setting `UPGRADE_LOCATION` when building git-annex on the
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autobuilders.
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When a new version is found, the webapp prompts the user to start the
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upgrade. (annex.autoupgrade can be set to true to upgrade w/o prompting.)
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The upgrade process is automatic, and rather tricky. The file is downloaded
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using git-annex (as a regular key!), and is then unpacked into a new
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directory, and the programfile updated to point to it. Then git-annex
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restarts itself.
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### manifest files
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To clean up the old installation, a git-annex.MANIFEST file is looked for
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in it, and the files listed, as well as empty directories, are deleted.
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I don't want to accidentially delete something I didn't ship!
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## restart on upgrade
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When git-annex is installed from a proper distribution package, there is no
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need for the above. But, the assistant still needs to notice when git-annex
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get upgraded, and offer to restart (or automatically restart when
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annex.autoupgrade is set).
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This is done using the DirWatcher, watching the directory containing the
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git-annex binary. Or, in the case of a non-distro install, watching the
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directory where eg git-annex.linux/ was unpacked.
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When an change is detected, restart.
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## multi-daemon upgrades
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A single system may have multiple assistant daemons running in different
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repositories.
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In this case, one daemon should do the non-distro upgrade, and the rest
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should notice the upgrade and restart.
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I don't want every daemon trying to download the file at once..
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2013-11-24 19:03:50 +00:00
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Approach: The first new version is installed into a stable directory, based
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on its version. So, start the upgrade by making this directory. If upgrade
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is already in progress, the directory will already exist. (Remove directory
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if upgrade fails.)
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