Improve and add comments

[safcm/safcm.git] / cmd / safcm / sync.go

diff --git a/cmd/safcm/sync.go b/cmd/safcm/sync.go
index 7fa2c936b637c7059e5429b273f310233ee92ed4..77e83c4187592ca1bd5cc31e44da3f4acfb4830d 100644 (file)
--- a/cmd/safcm/sync.go
+++ b/cmd/safcm/sync.go
@@ -22,6 +22,7 @@ import (
        "fmt"
        "log"
        "os"
+       "os/signal"
        "sort"
        "strings"
        "sync"
@@ -75,6 +76,8 @@ func MainSync(args []string) error {
                "hide successful, non-trigger commands with no output from host changes listing")
        optionLog := flag.String("log", "info", "set log `level`; "+
                "levels: error, info, verbose, debug, debug2, debug3")
+       optionSshConfig := flag.String("sshconfig", "",
+               "`path` to ssh configuration file; used for tests")
 
        flag.CommandLine.Parse(args[2:])
 
@@ -109,6 +112,7 @@ func MainSync(args []string) error {
        cfg.DryRun = *optionDryRun
        cfg.Quiet = *optionQuiet
        cfg.LogLevel = level
+       cfg.SshConfig = *optionSshConfig
 
        toSync, err := hostsToSync(names, allHosts, allGroups)
        if err != nil {
@@ -135,6 +139,38 @@ func MainSync(args []string) error {
                done <- failed
        }()
 
+       hostsLeft := make(map[string]bool)
+       for _, x := range toSync {
+               hostsLeft[x.Name] = true
+       }
+       var hostsLeftMutex sync.Mutex // protects hostsLeft
+
+       // Show unfinished hosts on Ctrl-C
+       sigint := make(chan os.Signal, 1)   // buffered for Notify()
+       signal.Notify(sigint, os.Interrupt) // = SIGINT = Ctrl-C
+       go func() {
+               // Running `ssh` processes get killed by SIGINT which is sent
+               // to all processes
+
+               <-sigint
+               log.Print("Received SIGINT, aborting ...")
+
+               // Print all queued events
+               events <- Event{} // poison pill
+               <-done
+               // "races" with <-done in the main function and will hang here
+               // if the other is faster. This is fine because then all hosts
+               // were synced successfully.
+
+               hostsLeftMutex.Lock()
+               var hosts []string
+               for x := range hostsLeft {
+                       hosts = append(hosts, x)
+               }
+               sort.Strings(hosts)
+               log.Fatalf("Failed to sync %s", strings.Join(hosts, ", "))
+       }()
+
        // Sync all hosts concurrently
        var wg sync.WaitGroup
        for _, x := range toSync {
@@ -160,6 +196,10 @@ func MainSync(args []string) error {
                                }
                        }
                        wg.Done()
+
+                       hostsLeftMutex.Lock()
+                       defer hostsLeftMutex.Unlock()
+                       delete(hostsLeft, x.Name)
                }()
        }
 
@@ -207,8 +247,8 @@ are only available after the hosts were contacted.
                nameMap[x] = true
        }
        nameMatched := make(map[string]bool)
-       // To detect typos we must check all given names but only want to add
-       // each match once
+       // To detect typos we must check all given names but one host can be
+       // matched by multiple names (e.g. two groups with overlapping hosts)
        hostMatched := make(map[string]bool)
 
        var res []*config.Host
@@ -327,7 +367,7 @@ func (s *Sync) Host(wg *sync.WaitGroup) error {
        }()
 
        // Connect to remote host
-       err := conn.DialSSH(s.host.SshUser, s.host.Name)
+       err := conn.DialSSH(s.host.SshUser, s.host.Name, s.config.SshConfig)
        if err != nil {
                return err
        }