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+Date: Sun, 24 Jul 2016 12:42:46 +0300
+From: Lars Wirzenius <liw@liw.fi>
+To: Stefano Zacchiroli <zack@upsilon.cc>
+Message-ID: <20160724094246.GG5765@exolobe3>
+References: <20160226085104.GA11872@upsilon.cc>
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+Cc: obnam-dev@obnam.org
+Subject: Re: injecting old backup generations
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+
+HI, sorry for taking several months to respond.
+
+On Fri, Feb 26, 2016 at 09:51:04AM +0100, Stefano Zacchiroli wrote:
+> a) faking paths: I want to be able to extract old backups in some dir,
+>    and tell obnam to backup those dirs as if they were the root dir
+>    (this is to avoid inconsistent path access when exploring pre-obnam
+>    backups and post-obnam ones)
+
+Right. So this has been asked for a few times, and while I'm generally
+not happy about the complexity it will introduce, I could be willing
+to add it, since there's enough reasonable use cases for it, it seems.
+
+The way I'd implement this is to have a hook that a plugin can use to
+change the path that gets put into the repository. In other words,
+Obnam would then work like this:
+
+    scan the filesystem, looking for paths for files to back up
+    for each file, mangle the path via a hook
+    use the mangled path to check if the file is in the repository
+      already, and if not, put it into the repository using the
+      mangled path
+    obviously, use the unmangled path to access the live data file
+
+A plugin would the attach itself to the hook, and mangle the path
+based on configuration from the user. At its core, the plugin would do
+this:
+
+    def mangle_path(pathname):
+        if pathname.startswith(self.strip_dirs):
+            pathname =3D pathname[len(self.strip_dirs):]
+        return pathname
+
+I've skipped one or two or a hundred details above, of course. Such as
+tests (unit and integration ones).
+
+I don't see a need to do the reverse hook for restoring.
+
+I've not done any coding for this. It should be a fairly simple task
+for someone who knows Python, except for the part of learning enough
+Obnam internals and test scaffolding to do a decent job.
+
+(Sometimes I think I should arrange a workshop for those who want to
+get familiar with Obnam internals. Alas, there's no funding.)
+
+> b) faking timestamps: once extracted old backups, I want to inject them
+>    telling obnam "consider this backup as dated $TIMESTAMP"
+
+This would similarly be a hook that mangles the metadata of the file.
+
+    obnam reads metadata from live data
+    obnam calls a hook to mangle the metadata
+    obnam stores mangled metadata
+
+I'd do this as a generic metadata mangling hook rather than
+specifically for timestamps.
+
+In addition to file metadata, there could be another hook for faking
+the generation timestamps, except that kinda already exists. The
+--pretend-time setting is there for testing purposes, but it could be
+used for setting the generation timestamps.
+
+--=20
+Schr=F6dinger's backup hypothesis: the condition of any backup is
+undefined until a restore is attempted. -- andrewsh
+
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