Finished adding exec functionality

main.go

@@ -2,70 +2,37 @@ package main
 
 import (
 	"bufio"
+	"bytes"
 	"fmt"
-	"os"
+	"os/exec"
 	"regexp"
-	"zfsbackup/zfsbackup"
+	"strings"
 )
 
-var zfsRegex = regexp.MustCompile(zfsbackup.ZfsSnapshotNameRegex)
+var _ = exec.Cmd{}
+var _ = bufio.Reader{}
 
-func testSnapshot(possible string, increment string) (bool, bool) {
-	var matches = zfsRegex.FindStringSubmatch(possible)
-	if matches == nil {
-		return false, false
-	}
-	var isASnapshot = true
-	if matches[1] == increment {
-		return isASnapshot, true
-	}
-	return isASnapshot, false
-}
-
-func isAYearlySnapshot(possible string) bool {
-	_, isYearly := testSnapshot(possible, "yearly")
-	return isYearly
-}
-
-func isAMonthlySnapshot(possible string) bool {
-	_, isMonthly := testSnapshot(possible, "monthly")
-	return isMonthly
-}
-
-func isAWeeklySnapshot(possible string) bool {
-	_, isWeekly := testSnapshot(possible, "weekly")
-	return isWeekly
-}
-
-func isADailySnapshot(possible string) bool {
-	_, isDaily := testSnapshot(possible, "daily")
-	return isDaily
-}
-
-func isAnHourlySnapshot(possible string) bool {
-	_, isHourly := testSnapshot(possible, "hourly")
-	return isHourly
-}
-
-func isAFrequentSnapshot(possible string) bool {
-	_, isFrequent := testSnapshot(possible, "frequent")
-	return isFrequent
-}
-
-var snapshotLineRegex = regexp.MustCompile("^" + zfsbackup.PoolNameRegex + "@" + zfsbackup.ZfsSnapshotNameRegex + ".*$")
+var zfsRegex = regexp.MustCompile(ZfsSnapshotNameRegex)
+var snapshotLineRegex = regexp.MustCompile("^" + PoolNameRegex + "@" + ZfsSnapshotNameRegex + ".*$")
 
 func main() {
-	//fmt.Println(snapshotLineRegex.MatchString("dpool/www@zfs-auto-snap_frequent-2020-08-04-1830\t0B\t-\t201M\t-"))
-	input := bufio.NewScanner(os.Stdin)
-	for input.Scan() {
-		if snapshotLineRegex.MatchString(input.Text()) {
-			fmt.Println(snapshotLineRegex.FindStringSubmatch(input.Text()))
-			fmt.Println(snapshotLineRegex.SubexpNames())
-		} else {
-			fmt.Printf("%s\t%s\n", input.Text(), "Is not a snapshot.")
+	var listCommand = exec.Command("zfs", "list", "-Hrt", "snapshot", "dpool")
+	var snapList, err = listCommand.CombinedOutput()
+	var snapScanner = bufio.NewScanner(bytes.NewReader(snapList))
+	if err != nil {
+		fmt.Println(listCommand)
+		fmt.Println("Error trying to list snapshots:", err.Error())
+		for snapScanner.Scan() {
+			fmt.Println(snapScanner.Text())
 		}
 	}
-	if err := input.Err(); err != nil {
-		fmt.Fprintln(os.Stderr, "reading Standard Input:", err)
+	for snapScanner.Scan() {
+		if snapshotLineRegex.MatchString(snapScanner.Text()) {
+			var temp = strings.SplitN(snapScanner.Text(), "\t", 2)
+			var snapshot = ParseSnapshot(temp[0])
+			if snapshot != nil {
+				fmt.Println("I found snapshot", snapshot.Name(), "at", snapshot.Path())
+			}
+		}
 	}
 }

regex.go

@@ -1,4 +1,4 @@
-package zfsbackup
+package main
 
 /*
 PoolNameRegex will match a zfs pool and filesystem tree

snapshot.go

@@ -1,4 +1,4 @@
-package zfsbackup
+package main
 
 import (
 	"errors"
@@ -66,6 +66,7 @@ func ParseSnapshot(input string) *Snapshot {
 	var paths []string = strings.Split(splitInput[0], "/")
 	theSnapshot.pool = paths[0]
 	if len(paths) > 1 {
+		theSnapshot.fsTree = make([]string, len(paths)-1)
 		copy(theSnapshot.fsTree, paths[1:])
 	}
 	return &theSnapshot
@@ -108,7 +109,7 @@ func (s Snapshot) Name() string {
 	var temp strings.Builder
 	temp.WriteString("zfs-auto-snap_")
 	temp.WriteString(intervalUIntToString(s.Interval) + "-")
-	fmt.Fprintf(&temp, "%d-%d-%d-%d%d", s.TimeStamp.Year(), s.TimeStamp.Month(), s.TimeStamp.Day(), s.TimeStamp.Hour(), s.TimeStamp.Minute())
+	fmt.Fprintf(&temp, "%04d-%02d-%02d-%02d%02d", s.TimeStamp.Year(), s.TimeStamp.Month(), s.TimeStamp.Day(), s.TimeStamp.Hour(), s.TimeStamp.Minute())
 	return temp.String()
 }
 
@@ -188,3 +189,47 @@ func CompareSnapshotDates(x Snapshot, y Snapshot) (int, error) {
 	}
 	return 0, nil
 }
+
+/*
+func testSnapshot(possible string, increment string) (bool, bool) {
+	var matches = zfsRegex.FindStringSubmatch(possible)
+	if matches == nil {
+		return false, false
+	}
+	var isASnapshot = true
+	if matches[1] == increment {
+		return isASnapshot, true
+	}
+	return isASnapshot, false
+}
+
+func isAYearlySnapshot(possible string) bool {
+	_, isYearly := testSnapshot(possible, "yearly")
+	return isYearly
+}
+
+func isAMonthlySnapshot(possible string) bool {
+	_, isMonthly := testSnapshot(possible, "monthly")
+	return isMonthly
+}
+
+func isAWeeklySnapshot(possible string) bool {
+	_, isWeekly := testSnapshot(possible, "weekly")
+	return isWeekly
+}
+
+func isADailySnapshot(possible string) bool {
+	_, isDaily := testSnapshot(possible, "daily")
+	return isDaily
+}
+
+func isAnHourlySnapshot(possible string) bool {
+	_, isHourly := testSnapshot(possible, "hourly")
+	return isHourly
+}
+
+func isAFrequentSnapshot(possible string) bool {
+	_, isFrequent := testSnapshot(possible, "frequent")
+	return isFrequent
+}
+*/