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fix(config): skip GUI port probing for UNIX sockets (fixes #9855) (#9858)

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When creating an initial default config, we usually probe for a free
TCP port.  But when a UNIX socket is specified via the `STGUIADDRESS=`
override or the `--gui-address=unix:///...` command line syntax, parsing
that option will fail during port probing.

The solution is to just skip the port probing when the address is
determined to specify something other than a TCP socket.

### Testing

Start with a fresh home directory each time.
1. Specify a UNIX socket for the GUI (works with this PR):

TMPHOME=$(mktemp -d); ./syncthing --home=$TMPHOME
--gui-address=unix://$TMPHOME/socket

2. Specify no GUI address (probes for a free port if default is taken,
   as before):

       TMPHOME=$(mktemp -d); ./syncthing --home=$TMPHOME

3. Specify a TCP GUI address (probes whether the given port is taken,
   as before):

TMPHOME=$(mktemp -d); ./syncthing --home=$TMPHOME
--gui-address=127.0.0.1:8385
This commit is contained in:
André Colomb 2024-12-09 08:24:42 +01:00 committed by GitHub
parent 7bea8c758a
commit b9c6d3ae09
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GPG Key ID: B5690EEEBB952194
1 changed files with 15 additions and 13 deletions
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4
lib/config/config.go
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@ -139,6 +139,7 @@ func New(myID protocol.DeviceID) Configuration {
}
func (cfg *Configuration) ProbeFreePorts() error {
if cfg.GUI.Network() == "tcp" {
guiHost, guiPort, err := net.SplitHostPort(cfg.GUI.Address())
if err != nil {
return fmt.Errorf("get default port (GUI): %w", err)
@ -152,8 +153,9 @@ func (cfg *Configuration) ProbeFreePorts() error {
return fmt.Errorf("get free port (GUI): %w", err)
}
cfg.GUI.RawAddress = net.JoinHostPort(guiHost, strconv.Itoa(port))
}
port, err = getFreePort("0.0.0.0", DefaultTCPPort)
port, err := getFreePort("0.0.0.0", DefaultTCPPort)
if err != nil {
return fmt.Errorf("get free port (BEP): %w", err)
}