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util/checkchange: stop using deephash everywhere

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Saves 45 KB from the min build, no longer pulling in deephash or
util/hashx, both with unsafe code.

It can actually be more efficient to not use deephash, as you don't
have to walk all bytes of all fields recursively to answer that two
things are not equal. Instead, you can just return false at the first
difference you see. And then with views (as we use ~everywhere
nowadays), the cloning the old value isn't expensive, as it's just a
pointer under the hood.

Updates #12614

Change-Id: I7b08616b8a09b3ade454bb5e0ac5672086fe8aec
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2025-10-04 17:40:09 -07:00
committed by Brad Fitzpatrick
parent 28b1b4c3c1
commit 316afe7d02
17 changed files with 365 additions and 48 deletions
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3
tsnet/depaware.txt
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@@ -247,12 +247,13 @@ tailscale.com/tsnet dependencies: (generated by github.com/tailscale/depaware)
tailscale.com/types/tkatype from tailscale.com/client/local+
tailscale.com/types/views from tailscale.com/appc+
tailscale.com/util/backoff from tailscale.com/control/controlclient+
tailscale.com/util/checkchange from tailscale.com/ipn/ipnlocal+
tailscale.com/util/cibuild from tailscale.com/health
tailscale.com/util/clientmetric from tailscale.com/appc+
tailscale.com/util/cloudenv from tailscale.com/hostinfo+
LW tailscale.com/util/cmpver from tailscale.com/net/dns+
tailscale.com/util/ctxkey from tailscale.com/client/tailscale/apitype+
💣 tailscale.com/util/deephash from tailscale.com/ipn/ipnlocal+
💣 tailscale.com/util/deephash from tailscale.com/util/syspolicy/setting
LA 💣 tailscale.com/util/dirwalk from tailscale.com/metrics
tailscale.com/util/dnsname from tailscale.com/appc+
tailscale.com/util/eventbus from tailscale.com/client/local+