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Skip IPAddr validation for "host-gateway" string 

Relates to - moby/moby 40007
The above PR added support in moby, that detects if
a special string "host-gateway" is added to the IP
section of --add-host, and if true, replaces it with
a special IP value (value of --host-gateway-ip Daemon flag
which defaults to the IP of the default bridge).

This PR is needed to skip the validation for the above
feature

Signed-off-by: Arko Dasgupta <arko.dasgupta@docker.com>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Arko Dasgupta 2020-02-11 12:00:06 -08:00 committed by Sebastiaan van Stijn
parent c3b48c5c9c
commit 67ebcd6dcf
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GPG Key ID: 76698F39D527CE8C
1 changed files with 11 additions and 2 deletions
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13
opts/hosts.go
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@ -24,6 +24,12 @@ var (
DefaultTLSHost = fmt.Sprintf("tcp://%s:%d", DefaultHTTPHost, DefaultTLSHTTPPort)
// DefaultNamedPipe defines the default named pipe used by docker on Windows
DefaultNamedPipe = `//./pipe/docker_engine`
// hostGatewayName defines a special string which users can append to --add-host
// to add an extra entry in /etc/hosts that maps host.docker.internal to the host IP
// TODO Consider moving the HostGatewayName constant defined in docker at
// github.com/docker/docker/daemon/network/constants.go outside of the "daemon"
// package, so that the CLI can consume it.
hostGatewayName = "host-gateway"
)
// ValidateHost validates that the specified string is a valid host and returns it.
@ -160,8 +166,11 @@ func ValidateExtraHost(val string) (string, error) {
if len(arr) != 2 || len(arr[0]) == 0 {
return "", fmt.Errorf("bad format for add-host: %q", val)
}
if _, err := ValidateIPAddress(arr[1]); err != nil {
return "", fmt.Errorf("invalid IP address in add-host: %q", arr[1])
// Skip IPaddr validation for "host-gateway" string
if arr[1] != hostGatewayName {
if _, err := ValidateIPAddress(arr[1]); err != nil {
return "", fmt.Errorf("invalid IP address in add-host: %q", arr[1])
}
}
return val, nil
}