Confirmed: Kopia's sync-to sftp has its own SFTP client and doesn't read
~/.ssh/config the way the system ssh/scp binaries do — so an alias set
up via wg-easy's sync-ssh-aliases.sh (or any ~/.ssh/config Host entry)
worked fine for the DR-spare connectivity check (which shells out to
real ssh) but silently failed for this mirror: a plain @-split on an
alias like "main" (no @ present) produced --host=main, a name that only
resolves inside ~/.ssh/config, not real DNS. The dry-run check correctly
rejected it and the mirror was never saved — no error surfaced beyond
that, so it looked like nothing happened.
Now resolves the destination through `ssh -G` before building the Kopia
flags — the same mechanism ssh itself uses to expand config aliases —
and falls back to the previous plain @-split only if that comes back
empty. Verified against three cases: a bare alias (resolves via a mock
~/.ssh/config Host block), an explicit user@ip (passes through
unchanged), and an unrecognized name (falls back to a sane literal
hostname rather than erroring).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4k6J1qXXyYxhGEgnJaMvn
Claude
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