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cmd/tailscale/cli: add 'wait' listening subcommand and ip --assert=<ip>

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This provides a mechanism to block, waiting for Tailscale's IP to be
ready for a bind/listen, to gate the starting of other services.

It also adds a new --assert=[IP] option to "tailscale ip", for services
that want extra paranoia about what IP is in use, if they're worried about
having switched to the wrong tailnet prior to reboot or something.

Updates #3340
Updates #11504

... and many more, IIRC

Change-Id: I88ab19ac5fae58fd8c516065bab685e292395565
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2026-01-30 13:59:09 -08:00
committed by Brad Fitzpatrick
parent abdbca47af
commit 8736fbb754
4 changed files with 172 additions and 3 deletions
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cmd/tailscale/depaware.txt
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@@ -251,6 +251,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
tailscale.com/types/structs from tailscale.com/ipn+
tailscale.com/types/tkatype from tailscale.com/types/key+
tailscale.com/types/views from tailscale.com/tailcfg+
tailscale.com/util/backoff from tailscale.com/cmd/tailscale/cli
tailscale.com/util/cibuild from tailscale.com/health+
tailscale.com/util/clientmetric from tailscale.com/net/netcheck+
tailscale.com/util/cloudenv from tailscale.com/net/dnscache+