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fix: re-detect the cache address per job and prefer IPv4 (#1398)

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The cache address was detected once at startup, and the interface fallback ranked ethernet names above IPv4. A runner that started before DHCPv4 finished could advertise a global IPv6 address to IPv4-only job networks until it restarted, failing every artifact and cache call.

IPv4 now ranks first, and the address is detected again for each job unless `cache.host` sets it. Detecting an IPv6 address logs a warning.

Fixes: https://gitea.com/gitea/runner/issues/1379
Co-authored-by: silverwind <[email protected]>
Co-authored-by: silverwind <[email protected]>
Reviewed-on: https://gitea.com/gitea/runner/pulls/1398
Reviewed-by: silverwind <[email protected]>
Co-authored-by: bircni <[email protected]>
This commit is contained in:
bircnisilverwindsilverwind
 authored and silverwind committed 2026-11-07 06:41:25 +00:00
1 parent cd748053b0
commit 8e999cd039
10 files changed
+156 -51
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act/common/outbound_ip.go
+8 -4
View File
@@ -6,6 +6,7 @@ package common
import (
"net"
"slices"
"sort"
"strings"
)
@@ -55,19 +56,22 @@ func GetOutboundIP() net.IP {
}
func preferredIP(ips []interfaceIP) net.IP {
ips = slices.DeleteFunc(ips, func(ip interfaceIP) bool {
return len(ip.Name) == 15 && strings.HasPrefix(ip.Name, "br-") && strings.Trim(ip.Name[3:], "0123456789abcdef") == "" // a Docker network's bridge, removed with the network
})
if len(ips) == 0 {
return nil
}
sort.Slice(ips, func(i, j int) bool {
first, second := ips[i], ips[j]
// ethernet is preferred
if vi, vj := strings.HasPrefix(first.Name, "e"), strings.HasPrefix(second.Name, "e"); vi != vj {
// IPv4 is preferred, as job networks are IPv4-only by default
if vi, vj := first.To4() != nil, second.To4() != nil; vi != vj {
return vi
}
// IPv4 is preferred
if vi, vj := first.To4() != nil, second.To4() != nil; vi != vj {
// ethernet is preferred
if vi, vj := strings.HasPrefix(first.Name, "e"), strings.HasPrefix(second.Name, "e"); vi != vj {
return vi
}
act/common/outbound_ip_test.go
+2 -1
View File
@@ -13,8 +13,9 @@ import (
func TestPreferredIP(t *testing.T) {
assert.Nil(t, preferredIP(nil))
assert.Equal(t, net.ParseIP("2001:db8::1"), preferredIP([]interfaceIP{{IP: net.ParseIP("2001:db8::1")}}))
assert.Equal(t, net.ParseIP("2001:db8::1"), preferredIP([]interfaceIP{
assert.Equal(t, net.ParseIP("192.0.2.1"), preferredIP([]interfaceIP{
{IP: net.ParseIP("192.0.2.1"), Name: "wlan0"},
{IP: net.ParseIP("2001:db8::1"), Name: "eth0"},
{IP: net.ParseIP("172.18.0.1"), Name: "br-0123456789ab"},
}))
}