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ssh exit status 255 is a connection problem

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Previously, when the git config was unable to be read from a ssh remote,
it would try to git fetch from it to determine if the remote was
otherwise accessible. That was unnessary work, since exit status 255
indicates a connection problem.

As well as avoiding the extra work of the fetch, this also improves
things when a ssh remote cannot be connected to due to a problem with
the git-annex ssh control socket. In that situation, ssh will also exit 255.
Before, the git fetch was tried in that situation, and would succeed, since
it does not use the git-annex ssh control socket. git-annex would conclude
that git-annex-shell was not installed on the remote, which could be wrong.

I suppose it also used to be possible for the user to need to enter a
ssh password on each connection to the remote. If they entered the wrong
password for the git-annex-shell call, but then the right password for
the git fetch, it would also incorrectly set annex-ignore, and that
situation is also now fixed.
This commit is contained in:
Joey Hess 2025-01-03 14:33:24 -04:00
parent e8e36a90c1
commit a19a3076b5
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5 changed files with 79 additions and 38 deletions
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doc/forum/Control_socket_connect__40__..__47__.git__47__annex__47__ssh__47__server.lo/comment_1_f530349d80ca5f43e9b2304f63e4b960._comment Normal file
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[[!comment format=mdwn
username="joey"
subject="""comment 1"""
date="2025-01-03T17:33:05Z"
content="""
I don't know why ssh is failing to connect via the socket file like that.
Generally when a socket file like this exists, there is a background ssh
process that is servicing connections to it. It may be there was some
problem with that process.
git-annex interprets ssh failing as the ssh server not having git-annex
installed, even though in this case it's some other problem. I have made
some changes that improve this, so in this situation it should not set
annex-ignore again, but will instead complain that it cannot connect to the
server.
"""]]