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util/slicesx: add FirstElementEqual and LastElementEqual

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And update a few callers as examples of motivation. (there are a
couple others, but these are the ones where it's prettier)

Updates #cleanup

Change-Id: Ic8c5cb7af0a59c6e790a599136b591ebe16d38eb
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-09-11 16:32:05 -07:00
committed by Brad Fitzpatrick
parent 910462a8e0
commit cec779e771
5 changed files with 45 additions and 4 deletions
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3
ssh/tailssh/tailssh.go
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@@ -45,6 +45,7 @@ import (
"tailscale.com/util/clientmetric"
"tailscale.com/util/httpm"
"tailscale.com/util/mak"
"tailscale.com/util/slicesx"
)
var (
@@ -330,7 +331,7 @@ func (c *conn) nextAuthMethodCallback(cm gossh.ConnMetadata, prevErrors []error)
switch {
case c.anyPasswordIsOkay:
nextMethod = append(nextMethod, "password")
case len(prevErrors) > 0 && prevErrors[len(prevErrors)-1] == errPubKeyRequired:
case slicesx.LastEqual(prevErrors, errPubKeyRequired):
nextMethod = append(nextMethod, "publickey")
}