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cmd/cloner: do not allocate slices when the source is nil

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tailcfg.Node zero-value clone equality checks failed when I added a
[]*foo to the structure, as the zero value and it's clone contained a
different slice header.

Updates #9377
Updates #9408
Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker
2023-09-14 10:52:37 -07:00
committed by James Tucker
parent 85155ddaf3
commit 1858ad65c8
5 changed files with 57 additions and 33 deletions
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8
wgengine/wgcfg/wgcfg_clone.go
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@@ -24,9 +24,11 @@ func (src *Config) Clone() *Config {
*dst = *src
dst.Addresses = append(src.Addresses[:0:0], src.Addresses...)
dst.DNS = append(src.DNS[:0:0], src.DNS...)
dst.Peers = make([]Peer, len(src.Peers))
for i := range dst.Peers {
dst.Peers[i] = *src.Peers[i].Clone()
if src.Peers != nil {
dst.Peers = make([]Peer, len(src.Peers))
for i := range dst.Peers {
dst.Peers[i] = *src.Peers[i].Clone()
}
}
return dst
}