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lib/model: Don't send symlinks to old devices that can't handle them (fixes #3802)

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GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/3811
This commit is contained in:
Jakob Borg 2016-12-17 19:48:33 +00:00 committed by Audrius Butkevicius
parent 263402f80a
commit f67c5a2fd6
1 changed files with 23 additions and 5 deletions
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28
lib/model/model.go
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@ -35,6 +35,7 @@ import (
"github.com/syncthing/syncthing/lib/stats"
"github.com/syncthing/syncthing/lib/symlinks"
"github.com/syncthing/syncthing/lib/sync"
"github.com/syncthing/syncthing/lib/upgrade"
"github.com/syncthing/syncthing/lib/versioner"
"github.com/thejerf/suture"
)
@ -764,6 +765,7 @@ func (m *Model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterCon
m.pmut.RLock()
conn, ok := m.conn[deviceID]
hello := m.helloMessages[deviceID]
m.pmut.RUnlock()
if !ok {
panic("bug: ClusterConfig called on closed or nonexistent connection")
@ -771,6 +773,14 @@ func (m *Model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterCon
dbLocation := filepath.Dir(m.db.Location())
// See issue #3802 - in short, we can't send modern symlink entries to older
// clients.
dropSymlinks := false
if hello.ClientName == m.clientName && upgrade.CompareVersions(hello.ClientVersion, "v0.14.14") < 0 {
l.Warnln("Not sending symlinks to old client", deviceID, "- please upgrade to v0.14.14 or newer")
dropSymlinks = true
}
m.fmut.Lock()
for _, folder := range cm.Folders {
if !m.folderSharedWithLocked(folder.ID, deviceID) {
@ -857,7 +867,7 @@ func (m *Model) ClusterConfig(deviceID protocol.DeviceID, cm protocol.ClusterCon
}
}
go sendIndexes(conn, folder.ID, fs, m.folderIgnores[folder.ID], startSequence, dbLocation)
go sendIndexes(conn, folder.ID, fs, m.folderIgnores[folder.ID], startSequence, dbLocation, dropSymlinks)
}
// This breaks if we send multiple CM messages during the same connection.
@ -1434,7 +1444,7 @@ func (m *Model) receivedFile(folder string, file protocol.FileInfo) {
m.folderStatRef(folder).ReceivedFile(file.Name, file.IsDeleted())
}
func sendIndexes(conn protocol.Connection, folder string, fs *db.FileSet, ignores *ignore.Matcher, startSequence int64, dbLocation string) {
func sendIndexes(conn protocol.Connection, folder string, fs *db.FileSet, ignores *ignore.Matcher, startSequence int64, dbLocation string, dropSymlinks bool) {
deviceID := conn.ID()
name := conn.Name()
var err error
@ -1442,7 +1452,7 @@ func sendIndexes(conn protocol.Connection, folder string, fs *db.FileSet, ignore
l.Debugf("sendIndexes for %s-%s/%q starting (slv=%d)", deviceID, name, folder, startSequence)
defer l.Debugf("sendIndexes for %s-%s/%q exiting: %v", deviceID, name, folder, err)
minSequence, err := sendIndexTo(startSequence, conn, folder, fs, ignores, dbLocation)
minSequence, err := sendIndexTo(startSequence, conn, folder, fs, ignores, dbLocation, dropSymlinks)
// Subscribe to LocalIndexUpdated (we have new information to send) and
// DeviceDisconnected (it might be us who disconnected, so we should
@ -1465,7 +1475,7 @@ func sendIndexes(conn protocol.Connection, folder string, fs *db.FileSet, ignore
continue
}
minSequence, err = sendIndexTo(minSequence, conn, folder, fs, ignores, dbLocation)
minSequence, err = sendIndexTo(minSequence, conn, folder, fs, ignores, dbLocation, dropSymlinks)
// Wait a short amount of time before entering the next loop. If there
// are continuous changes happening to the local index, this gives us
@ -1474,7 +1484,7 @@ func sendIndexes(conn protocol.Connection, folder string, fs *db.FileSet, ignore
}
}
func sendIndexTo(minSequence int64, conn protocol.Connection, folder string, fs *db.FileSet, ignores *ignore.Matcher, dbLocation string) (int64, error) {
func sendIndexTo(minSequence int64, conn protocol.Connection, folder string, fs *db.FileSet, ignores *ignore.Matcher, dbLocation string, dropSymlinks bool) (int64, error) {
deviceID := conn.ID()
name := conn.Name()
batch := make([]protocol.FileInfo, 0, indexBatchSize)
@ -1496,6 +1506,14 @@ func sendIndexTo(minSequence int64, conn protocol.Connection, folder string, fs
maxSequence = f.Sequence
}
if dropSymlinks && f.IsSymlink() {
// Do not send index entries with symlinks to clients that can't
// handle it. Fixes issue #3802. Once both sides are upgraded, a
// rescan (i.e., change) of the symlink is required for it to
// sync again, due to delta indexes.
return true
}
sorter.Append(f)
return true
})