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Fix nil dereference in nodes list command.

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Fixes a nil pointer dereference observed when listing nodes that have
not yet connected.

```
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xb931a4]

goroutine 1 [running]:
github.com/juanfont/headscale/cmd/headscale/cli.glob..func8(0x13c93e0, 0xc0004c4220, 0x0, 0x2)
	/go/src/headscale/cmd/headscale/cli/nodes.go:74 +0x364
github.com/spf13/cobra.(*Command).execute(0x13c93e0, 0xc0004c41e0, 0x2, 0x2, 0x13c93e0, 0xc0004c41e0)
	/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:856 +0x2c2
github.com/spf13/cobra.(*Command).ExecuteC(0x13ca2e0, 0xc000497110, 0xe76416, 0x6)
	/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:960 +0x375
github.com/spf13/cobra.(*Command).Execute(...)
	/go/pkg/mod/github.com/spf13/cobra@v1.1.3/command.go:897
main.main()
	/go/src/headscale/cmd/headscale/headscale.go:89 +0x805
command terminated with exit code 2
```
This commit is contained in:
Casey Marshall 2021-06-19 18:18:13 -05:00
parent a63fb6b007
commit fdcd3bb574
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1 changed files with 6 additions and 1 deletions
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7
cmd/headscale/cli/nodes.go
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@ -4,6 +4,7 @@ import (
"fmt" "fmt"
"log" "log"
"strings" "strings"
"time"
"github.com/spf13/cobra" "github.com/spf13/cobra"
) )
@ -71,7 +72,11 @@ var ListNodesCmd = &cobra.Command{
if m.AuthKey != nil && m.AuthKey.Ephemeral { if m.AuthKey != nil && m.AuthKey.Ephemeral {
ephemeral = true ephemeral = true
} }
fmt.Printf("%s\t%s\t%t\n", m.Name, m.LastSeen.Format("2006-01-02 15:04:05"), ephemeral) var lastSeen time.Time
if m.LastSeen != nil {
lastSeen = *m.LastSeen
}
fmt.Printf("%s\t%s\t%t\n", m.Name, lastSeen.Format("2006-01-02 15:04:05"), ephemeral)
} }
}, },