syncthing/lib/fs/platform_common.go

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// Copyright (C) 2022 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package fs
import (
"os/user"
"strconv"
"github.com/syncthing/syncthing/lib/protocol"
)
// unixPlatformData is used on all platforms, because apart from being the
// implementation for BasicFilesystem on Unixes it's also the implementation
// in fakeFS.
func unixPlatformData(fs Filesystem, name string) (protocol.PlatformData, error) {
stat, err := fs.Lstat(name)
if err != nil {
return protocol.PlatformData{}, err
}
ownerUID := stat.Owner()
ownerName := ""
if u, err := user.LookupId(strconv.Itoa(ownerUID)); err == nil && u.Username != "" {
ownerName = u.Username
} else if ownerUID == 0 {
// We couldn't look up a name, but UID zero should be "root". This
// fixup works around the (unlikely) situation where the ownership
// is 0:0 but we can't look up a name for either uid zero or gid
// zero. If that were the case we'd return a zero PlatformData which
// wouldn't get serialized over the wire and the other side would
// assume a lack of ownership info...
ownerName = "root"
}
groupID := stat.Group()
groupName := ""
if g, err := user.LookupGroupId(strconv.Itoa(groupID)); err == nil && g.Name != "" {
groupName = g.Name
} else if groupID == 0 {
groupName = "root"
}
return protocol.PlatformData{
Unix: &protocol.UnixData{
OwnerName: ownerName,
GroupName: groupName,
UID: ownerUID,
GID: groupID,
},
}, nil
}