Duply backup status

Forked on github to improve code

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Great plugin. We run a lot of different backups to S3 on one server. We were surprised to see a CRITICAL error today "Unexpected output: Another instance is already running with this archive directory"

To fix this I think I only needed to add at line 70:

if output.find("Another instance is already running with this archive directory")==1:
return False

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Hi,

a) s3 backup check works mostly out of the box
"Problem". sudo rights needs "ALL" or full path
/usr/bin/duply to work

b) ssh backup creates STDERR output:

# duply `hostname` status >/dev/null
ssh: Connected (version 2.0, client OpenSSH_5.5p1)
ssh: Authentication (publickey) successful!
ssh: Secsh channel 1 opened.
ssh: [chan 1] Opened sftp connection (server version 3)
which needs to be filtered/ignored.
( I try to post here later a fix for it).

Bests

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