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package ssh
import (
"sync"
"github.com/git-lfs/git-lfs/v3/config"
"github.com/git-lfs/git-lfs/v3/subprocess"
"github.com/git-lfs/pktline"
)
type SSHTransfer struct {
lock *sync.RWMutex
conn []*PktlineConnection
osEnv config.Environment
gitEnv config.Environment
meta *SSHMetadata
operation string
multiplexing bool
}
func NewSSHTransfer(osEnv config.Environment, gitEnv config.Environment, meta *SSHMetadata, operation string) (*SSHTransfer, error) {
conn, multiplexing, err := startConnection(0, osEnv, gitEnv, meta, operation)
if err != nil {
return nil, err
}
return &SSHTransfer{
lock: &sync.RWMutex{},
osEnv: osEnv,
gitEnv: gitEnv,
meta: meta,
operation: operation,
multiplexing: multiplexing,
conn: []*PktlineConnection{conn},
}, nil
}
func startConnection(id int, osEnv config.Environment, gitEnv config.Environment, meta *SSHMetadata, operation string) (*PktlineConnection, bool, error) {
exe, args, multiplexing := GetLFSExeAndArgs(osEnv, gitEnv, meta, "git-lfs-transfer", operation, true)
cmd, err := subprocess.ExecCommand(exe, args...)
if err != nil {
return nil, false, err
}
r, err := cmd.StdoutPipe()
if err != nil {
return nil, false, err
}
w, err := cmd.StdinPipe()
if err != nil {
return nil, false, err
}
err = cmd.Start()
if err != nil {
return nil, false, err
}
var pl Pktline
if osEnv.Bool("GIT_TRACE_PACKET", false) {
pl = &TraceablePktline{id: id, pl: pktline.NewPktline(r, w)}
} else {
pl = pktline.NewPktline(r, w)
}
conn := &PktlineConnection{
cmd: cmd,
pl: pl,
r: r,
w: w,
}
err = conn.Start()
if err != nil {
r.Close()
w.Close()
cmd.Wait()
}
return conn, multiplexing, err
}
// Connection returns the nth connection (starting from 0) in this transfer
// instance or nil if there is no such item.
func (tr *SSHTransfer) IsMultiplexingEnabled() bool {
return tr.multiplexing
}
// Connection returns the nth connection (starting from 0) in this transfer
// instance or nil if there is no such item.
func (tr *SSHTransfer) Connection(n int) *PktlineConnection {
tr.lock.RLock()
defer tr.lock.RUnlock()
if n >= len(tr.conn) {
return nil
}
return tr.conn[n]
}
// ConnectionCount returns the number of connections this object has.
func (tr *SSHTransfer) ConnectionCount() int {
tr.lock.RLock()
defer tr.lock.RUnlock()
return len(tr.conn)
}
// SetConnectionCount sets the number of connections to the specified number.
func (tr *SSHTransfer) SetConnectionCount(n int) error {
tr.lock.Lock()
defer tr.lock.Unlock()
return tr.setConnectionCount(n)
}
// SetConnectionCountAtLeast sets the number of connections to be not less than
// the specified number.
func (tr *SSHTransfer) SetConnectionCountAtLeast(n int) error {
tr.lock.Lock()
defer tr.lock.Unlock()
count := len(tr.conn)
if n <= count {
return nil
}
return tr.setConnectionCount(n)
}
func (tr *SSHTransfer) setConnectionCount(n int) error {
count := len(tr.conn)
if n < count {
for _, item := range tr.conn[n:count] {
if err := item.End(); err != nil {
return err
}
}
tr.conn = tr.conn[0:n]
} else if n > count {
for i := count; i < n; i++ {
conn, _, err := startConnection(i, tr.osEnv, tr.gitEnv, tr.meta, tr.operation)
if err != nil {
return err
}
tr.conn = append(tr.conn, conn)
}
}
return nil
}
func (tr *SSHTransfer) Shutdown() error {
return tr.SetConnectionCount(0)
}
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