Sending file over SSH in go
-1
I found this answer before posting this question but the answer is not clear to me.
Here is the code of the answer:
conn, err := ssh.Dial("tcp", hostname+":22", config)
if err != nil {
return err
}
session, err := conn.NewSession()
if err != nil {
return err
}
defer session.Close()
r, err := session.StdoutPipe()
if err != nil {
return err
}
name := fmt.Sprintf("%s/backup_folder_%v.tar.gz", path, time.Now().Unix())
file, err := os.OpenFile(name, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
if err := session.Start(cmd); err != nil {
return err
}
n, err := io.Copy(file, r)
if err != nil {
return err
}
if err := session.Wait(); err != nil {
return err
}
return nil
I don't understand relation between the cmd variable and io.Copy, where and how does it know which file to copy.
I like the idea of using io.Copy but i do not know how to create the file via ssh and start sending content to it using io.Copy.
go ssh asked Nov 12 at 5:29
HowToGo
827
add a comment |
-1
I found this answer before posting this question but the answer is not clear to me.
Here is the code of the answer:
conn, err := ssh.Dial("tcp", hostname+":22", config)
if err != nil {
return err
}
session, err := conn.NewSession()
if err != nil {
return err
}
defer session.Close()
r, err := session.StdoutPipe()
if err != nil {
return err
}
name := fmt.Sprintf("%s/backup_folder_%v.tar.gz", path, time.Now().Unix())
file, err := os.OpenFile(name, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
if err := session.Start(cmd); err != nil {
return err
}
n, err := io.Copy(file, r)
if err != nil {
return err
}
if err := session.Wait(); err != nil {
return err
}
return nil
I don't understand relation between the cmd variable and io.Copy, where and how does it know which file to copy.
I like the idea of using io.Copy but i do not know how to create the file via ssh and start sending content to it using io.Copy.
go ssh asked Nov 12 at 5:29
HowToGo
827
1
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38
add a comment |
-1
-1
-1
I found this answer before posting this question but the answer is not clear to me.
Here is the code of the answer:
conn, err := ssh.Dial("tcp", hostname+":22", config)
if err != nil {
return err
}
session, err := conn.NewSession()
if err != nil {
return err
}
defer session.Close()
r, err := session.StdoutPipe()
if err != nil {
return err
}
name := fmt.Sprintf("%s/backup_folder_%v.tar.gz", path, time.Now().Unix())
file, err := os.OpenFile(name, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
if err := session.Start(cmd); err != nil {
return err
}
n, err := io.Copy(file, r)
if err != nil {
return err
}
if err := session.Wait(); err != nil {
return err
}
return nil
I don't understand relation between the cmd variable and io.Copy, where and how does it know which file to copy.
I like the idea of using io.Copy but i do not know how to create the file via ssh and start sending content to it using io.Copy.
go ssh asked Nov 12 at 5:29
HowToGo
827
I found this answer before posting this question but the answer is not clear to me.
Here is the code of the answer:
conn, err := ssh.Dial("tcp", hostname+":22", config)
if err != nil {
return err
}
session, err := conn.NewSession()
if err != nil {
return err
}
defer session.Close()
r, err := session.StdoutPipe()
if err != nil {
return err
}
name := fmt.Sprintf("%s/backup_folder_%v.tar.gz", path, time.Now().Unix())
file, err := os.OpenFile(name, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
return err
}
defer file.Close()
if err := session.Start(cmd); err != nil {
return err
}
n, err := io.Copy(file, r)
if err != nil {
return err
}
if err := session.Wait(); err != nil {
return err
}
return nil
I don't understand relation between the cmd variable and io.Copy, where and how does it know which file to copy.
I like the idea of using io.Copy but i do not know how to create the file via ssh and start sending content to it using io.Copy.
go ssh go ssh asked Nov 12 at 5:29
HowToGo
827
asked Nov 12 at 5:29
HowToGo
827
asked Nov 12 at 5:29
HowToGo
827
asked Nov 12 at 5:29
HowToGo
827
asked Nov 12 at 5:29
HowToGo
827
827
1
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38
add a comment |
1
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38
1
1
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38
add a comment |
1 Answer
1
active
oldest
votes
1
Here is a minimal example on how to use Go as an scp client:
config := &ssh.ClientConfig{
User: "user",
Auth: ssh.AuthMethod{
ssh.Password("pass"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, _ := ssh.Dial("tcp", "remotehost:22", config)
defer client.Close()
session, _ := client.NewSession()
defer session.Close()
file, _ := os.Open("filetocopy")
defer file.Close()
stat, _ := file.Stat()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hostIn, _ := session.StdinPipe()
defer hostIn.Close()
fmt.Fprintf(hostIn, "C0664 %d %sn", stat.Size(), "filecopyname")
io.Copy(hostIn, file)
fmt.Fprint(hostIn, "x00")
wg.Done()
}()
session.Run("/usr/bin/scp -t /remotedirectory/")
wg.Wait()
Note that I have ignored all errors only for conciseness.
session.StdinPipe()will create a writable pipe for the remote host.
fmt.Fprintf(... "C0664 ...")will signal the start of a file with0664permission,stat.Size()size and the remote filenamefilecopyname.
io.Copy(hostIn, file)will write the contents offileintohostIn.
fmt.Fprint(hostIn, "x00")will signal the end of the file.
session.Run("/usr/bin/scp -qt /remotedirectory/")will run the scp command.
Edit: Added waitgroup per OP's request
answered Nov 12 at 8:52
ssemilla
3,077424
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
|
show 3 more comments
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
Here is a minimal example on how to use Go as an scp client:
config := &ssh.ClientConfig{
User: "user",
Auth: ssh.AuthMethod{
ssh.Password("pass"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, _ := ssh.Dial("tcp", "remotehost:22", config)
defer client.Close()
session, _ := client.NewSession()
defer session.Close()
file, _ := os.Open("filetocopy")
defer file.Close()
stat, _ := file.Stat()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hostIn, _ := session.StdinPipe()
defer hostIn.Close()
fmt.Fprintf(hostIn, "C0664 %d %sn", stat.Size(), "filecopyname")
io.Copy(hostIn, file)
fmt.Fprint(hostIn, "x00")
wg.Done()
}()
session.Run("/usr/bin/scp -t /remotedirectory/")
wg.Wait()
Note that I have ignored all errors only for conciseness.
session.StdinPipe()will create a writable pipe for the remote host.
fmt.Fprintf(... "C0664 ...")will signal the start of a file with0664permission,stat.Size()size and the remote filenamefilecopyname.
io.Copy(hostIn, file)will write the contents offileintohostIn.
fmt.Fprint(hostIn, "x00")will signal the end of the file.
session.Run("/usr/bin/scp -qt /remotedirectory/")will run the scp command.
Edit: Added waitgroup per OP's request
answered Nov 12 at 8:52
ssemilla
3,077424
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
|
show 3 more comments
1
Here is a minimal example on how to use Go as an scp client:
config := &ssh.ClientConfig{
User: "user",
Auth: ssh.AuthMethod{
ssh.Password("pass"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, _ := ssh.Dial("tcp", "remotehost:22", config)
defer client.Close()
session, _ := client.NewSession()
defer session.Close()
file, _ := os.Open("filetocopy")
defer file.Close()
stat, _ := file.Stat()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hostIn, _ := session.StdinPipe()
defer hostIn.Close()
fmt.Fprintf(hostIn, "C0664 %d %sn", stat.Size(), "filecopyname")
io.Copy(hostIn, file)
fmt.Fprint(hostIn, "x00")
wg.Done()
}()
session.Run("/usr/bin/scp -t /remotedirectory/")
wg.Wait()
Note that I have ignored all errors only for conciseness.
session.StdinPipe()will create a writable pipe for the remote host.
fmt.Fprintf(... "C0664 ...")will signal the start of a file with0664permission,stat.Size()size and the remote filenamefilecopyname.
io.Copy(hostIn, file)will write the contents offileintohostIn.
fmt.Fprint(hostIn, "x00")will signal the end of the file.
session.Run("/usr/bin/scp -qt /remotedirectory/")will run the scp command.
Edit: Added waitgroup per OP's request
answered Nov 12 at 8:52
ssemilla
3,077424
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
|
show 3 more comments
1
1
1
Here is a minimal example on how to use Go as an scp client:
config := &ssh.ClientConfig{
User: "user",
Auth: ssh.AuthMethod{
ssh.Password("pass"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, _ := ssh.Dial("tcp", "remotehost:22", config)
defer client.Close()
session, _ := client.NewSession()
defer session.Close()
file, _ := os.Open("filetocopy")
defer file.Close()
stat, _ := file.Stat()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hostIn, _ := session.StdinPipe()
defer hostIn.Close()
fmt.Fprintf(hostIn, "C0664 %d %sn", stat.Size(), "filecopyname")
io.Copy(hostIn, file)
fmt.Fprint(hostIn, "x00")
wg.Done()
}()
session.Run("/usr/bin/scp -t /remotedirectory/")
wg.Wait()
Note that I have ignored all errors only for conciseness.
session.StdinPipe()will create a writable pipe for the remote host.
fmt.Fprintf(... "C0664 ...")will signal the start of a file with0664permission,stat.Size()size and the remote filenamefilecopyname.
io.Copy(hostIn, file)will write the contents offileintohostIn.
fmt.Fprint(hostIn, "x00")will signal the end of the file.
session.Run("/usr/bin/scp -qt /remotedirectory/")will run the scp command.
Edit: Added waitgroup per OP's request
answered Nov 12 at 8:52
ssemilla
3,077424
Here is a minimal example on how to use Go as an scp client:
config := &ssh.ClientConfig{
User: "user",
Auth: ssh.AuthMethod{
ssh.Password("pass"),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
client, _ := ssh.Dial("tcp", "remotehost:22", config)
defer client.Close()
session, _ := client.NewSession()
defer session.Close()
file, _ := os.Open("filetocopy")
defer file.Close()
stat, _ := file.Stat()
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
hostIn, _ := session.StdinPipe()
defer hostIn.Close()
fmt.Fprintf(hostIn, "C0664 %d %sn", stat.Size(), "filecopyname")
io.Copy(hostIn, file)
fmt.Fprint(hostIn, "x00")
wg.Done()
}()
session.Run("/usr/bin/scp -t /remotedirectory/")
wg.Wait()
Note that I have ignored all errors only for conciseness.
session.StdinPipe()will create a writable pipe for the remote host.
fmt.Fprintf(... "C0664 ...")will signal the start of a file with0664permission,stat.Size()size and the remote filenamefilecopyname.
io.Copy(hostIn, file)will write the contents offileintohostIn.
fmt.Fprint(hostIn, "x00")will signal the end of the file.
session.Run("/usr/bin/scp -qt /remotedirectory/")will run the scp command.
Edit: Added waitgroup per OP's request
answered Nov 12 at 8:52
ssemilla
3,077424
edited Nov 12 at 13:21
answered Nov 12 at 8:52
ssemilla
3,077424
answered Nov 12 at 8:52
ssemilla
3,077424
answered Nov 12 at 8:52
ssemilla
3,077424
3,077424
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
|
show 3 more comments
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
If you don't want to go through the trouble of writing this, there are already packages out there that has this functionality: github.com/bramvdbogaerde/go-scp
– ssemilla
Nov 12 at 8:53
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
I really wanted answer like this. Thanks a lot.
– HowToGo
Nov 12 at 12:35
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
It doesn't really work for me. It creates the file but there is no content inside. I actually realised it's not great to use session with scp within a command. This answer looks more of a copy paste than actual answer. io.Copy does not work. It just finishes because it's inside of the Goroutine otherwise it's left "doing something"
– HowToGo
Nov 12 at 12:57
file with no content?
– HowToGo
Nov 12 at 13:02
file with no content?
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
io.Copy spins forever
– HowToGo
Nov 12 at 13:02
|
show 3 more comments
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1
You can use github.com/bramvdbogaerde/go-scp
– Ullaakut
Nov 12 at 7:38