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David Anderson a320d70614 net/dns: fall back to copy+delete/truncate if moving to/from /etc/resolv.conf fails.

In some containers, /etc/resolv.conf is a bind-mount from outside the container.
This prevents renaming to or from /etc/resolv.conf, because it's on a different
filesystem from linux's perspective. It also prevents removing /etc/resolv.conf,
because doing so would break the bind-mount.

If we find ourselves within this environment, fall back to using copy+delete when
renaming to /etc/resolv.conf, and copy+truncate when renaming from /etc/resolv.conf.

Fixes #3000

Co-authored-by: Denton Gentry <dgentry@tailscale.com>
Signed-off-by: David Anderson <danderson@tailscale.com>

2021-10-26 09:03:37 -07:00

dns

net/dns: fall back to copy+delete/truncate if moving to/from /etc/resolv.conf fails.

2021-10-26 09:03:37 -07:00

dnscache

net/{dnscache,interfaces}: use netaddr.IP.IsPrivate, delete copied code

2021-07-26 20:30:28 -07:00

dnsfallback

cmd/cloner: mangle "go:generate" in cloner.go

2021-10-16 17:53:43 -07:00

flowtrack

fix: typo spelling grammar