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+Date: Sun, 20 Dec 2015 15:51:40 +0100
+From: Lars Wirzenius <liw@liw.fi>
+To: Kyle Manna <2bluesc@gmail.com>
+Message-ID: <20151220145140.GG2511@exolobe1.liw.fi>
+References: <CAM9fjH50TfjxaY9spb8tFgxGfpXJ2kyw93PpnGrPeNO4AL4wNA@mail.gmail.com>
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+Cc: obnam-dev@obnam.org
+Subject: Re: Paramiko 1.16 breaks obnam
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+
+Hi, sorry about taking so long to answer.
+
+This is an unfortunate change in paramiko. Not that the new feature in
+prefetch is bad, but the change is backwards incompatible. Your patch
+makes Obnam work with paramiko 1.16, but breaks it for 1.15.1.
+
+I don't want to break Obnam for paramiko 1.15.1, so this is going to
+require Obnam checking what version of paramiko it is talking to, and
+calling it differently depending. This is an example of why it's good
+to be careful about dependencies.
+
+I rewrote the patch to work with older paramiko and credited you in
+the commit message and NEWS file. Thank you!
+
+On Fri, Nov 06, 2015 at 09:45:49AM -0800, Kyle Manna wrote:
+> After upgrading python2-paramiko (1.15.3-1 -> 1.16.0-1), the sftp lib cra=
+shes:
+>=20
+> Traceback (most recent call last):
+>   File "/usr/lib/python2.7/site-packages/cliapp/app.py", line 189, in _run
+>     self.process_args(args)
+>   File "/usr/lib/python2.7/site-packages/obnamlib/app.py", line 207,
+> in process_args
+>     cliapp.Application.process_args(self, args)
+>   File "/usr/lib/python2.7/site-packages/cliapp/app.py", line 566, in
+> process_args
+>     method(args[1:])
+>   File "/usr/lib/python2.7/site-packages/obnamlib/plugins/force_lock_plug=
+in.py",
+> line 49, in force_lock
+>     for client_name in repo.get_client_names():
+>   File "/usr/lib/python2.7/site-packages/obnamlib/fmt_6/repo_fmt_6.py",
+> line 154, in get_client_names
+>     return self._client_list.list_clients()
+>   File "/usr/lib/python2.7/site-packages/obnamlib/fmt_6/clientlist.py",
+> line 78, in list_clients
+>     if self.init_forest() and self.forest.trees:
+>   File "/usr/lib/python2.7/site-packages/obnamlib/fmt_6/repo_tree.py",
+> line 63, in init_forest
+>     allow_writes=3Dallow_writes)
+>   File "/usr/lib/python2.7/site-packages/larch/forest.py", line 199,
+> in open_forest
+>     check_size('key_size', key_size, BadKeySize)
+>   File "/usr/lib/python2.7/site-packages/larch/forest.py", line 193,
+> in check_size
+>     if keyname not in ns.get_metadata_keys():
+>   File "/usr/lib/python2.7/site-packages/larch/nodestore_disk.py",
+> line 167, in get_metadata_keys
+>     self._load_metadata()
+>   File "/usr/lib/python2.7/site-packages/larch/nodestore_disk.py",
+> line 148, in _load_metadata
+>     data =3D self.journal.cat(self.metadata_name)
+>   File "/usr/lib/python2.7/site-packages/larch/journal.py", line 162, in =
+cat
+>     return self.fs.cat(filename)
+>   File "/usr/lib/python2.7/site-packages/obnamlib/repo_fs.py", line 56, i=
+n cat
+>     data =3D self.fs.cat(filename)
+>   File "/usr/lib/python2.7/site-packages/obnamlib/plugins/sftp_plugin.py",
+> line 588, in cat
+>     f.prefetch()
+> TypeError: prefetch() takes exactly 2 arguments (1 given)
+>=20
+>=20
+> Documentation confirms the added file size argument:
+> http://docs.paramiko.org/en/1.15/api/sftp.html
+> http://docs.paramiko.org/en/1.16/api/sftp.html
+>=20
+> Change that broke it:
+> https://github.com/paramiko/paramiko/commit/49072f3537a8981e9d448c22481a1=
+d2b92c03643
+>=20
+> My patch to fix this by prefetching the entire file:
+> https://gist.github.com/kylemanna/cc951490b992050f86ac
+>=20
+> --- a/obnamlib/plugins/sftp_plugin.py
+> +++ b/obnamlib/plugins/sftp_plugin.py
+> @@ -555,7 +555,7 @@ class SftpFS(obnamlib.VirtualFileSystem):
+> def cat(self, pathname):
+> self._delay()
+> f =3D self.open(pathname, 'rb')
+> - f.prefetch()
+> + f.prefetch(self.lstat(pathname).st_size)
+> chunks =3D []
+> while True:
+> chunk =3D f.read(self.chunk_size)
+> =E1=90=A7
+>=20
+> _______________________________________________
+> obnam-dev mailing list
+> obnam-dev@obnam.org
+> http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam=
+=2Eorg
+>=20
+
+--=20
+Schr=C3=B6dinger's backup hypothesis: the condition of any backup is
+undefined until a restore is attempted. -- andrewsh
+
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+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
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