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[solved] tar over an ssh'ed network connection failed
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toralf
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Joined: 01 Feb 2004
Posts: 3709
Location: Hamburg

PostPosted: Sun Jul 24, 2016 8:41 pm    Post subject: [solved] tar over an ssh'ed network connection failed Reply with quote

I know that this worked in the past (hardened amd64 host, x86 kvm) to unpack a new kernel from a local git tree to a kvm machine, but now it fails :
Code:
$ git archive --prefix linux-4.7.x/ v4.7 | (ssh root@n22kvm; cd /usr/src/; sudo tar -tf- 1>/dev/null)
Pseudo-terminal will not be allocated because stdin is not a terminal.
-bash: line 1: pax_global_header00006660000000000000000000000064127452127060014520gustar00rootroot0000000000000052: command not found
-bash: line 2: syntax error near unexpected token `newline'
-bash: line 2: `linux-4.7.x/000077500000000000000000000000001274521270600127775ustar00rootroot00000000000000linux-4.7.x/.get_maintainer.ignore000066400000000000000000000000371274521270600172500ustar00rootroot00000000000000Christoph Hellwig <hch@lst.de>'
tar: This does not look like a tar archive
tar: Skipping to next header
tar: Exiting with failure status due to previous errors
It works fine for the local host:
Code:
$ git archive --prefix linux-4.7.x/ v4.7 | (cd /usr/src/; sudo tar -tf- 1>/dev/null)
Now I do wonder about the issue. It is related to the ssh b/c within the KVM it works fine too :
Code:
# git archive --prefix linux-4.7.x/ v4.7 | (cd /usr/src/; tar -tf- 1>/dev/null)
(nfs mounted the git tree)

Last edited by toralf on Mon Jul 25, 2016 8:01 am; edited 1 time in total
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Hu
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Posts: 14180

PostPosted: Sun Jul 24, 2016 10:30 pm    Post subject: Reply with quote

You are not unpacking a tar archive over ssh. You are sending a tar archive to the shell running as root@n22kvm, then locally running some commands after that ssh exits. Unless root@n22kvm uses tar xf - as its shell, that is highly unlikely to do anything good or useful. You ran (ssh root@n22kvm; cd /usr/src/; sudo tar -tf- 1>/dev/null). You probably should have run ssh root@n22kvm sudo tar -C /usr/src/ -x -f -.
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toralf
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Joined: 01 Feb 2004
Posts: 3709
Location: Hamburg

PostPosted: Mon Jul 25, 2016 8:00 am    Post subject: Reply with quote

*head smack* this works:
Code:
$ git archive --prefix linux-4.7.x/ v4.7 | ssh root@n22kvm "cd /usr/src/; tar -tf- 1>/dev/null"
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