Implement initial server-side shearing logic

src/sync/common.go

@@ -6,6 +6,7 @@ import (
 	"io/fs"
 	"os"
 	"path/filepath"
+	"strings"
 )
 
 // WalkEntryDir walks the entry directory and returns lists of all files and directories found (two separate lists)
@@ -56,3 +57,47 @@ func getModTimes(entryList []string) []int64 {
 
 	return modList
 }
+
+// Shear removes the target file or directory from the system
+// if running on the server, it will also add the target to the deletions list
+// if running on the client, it will call the server to add the target to the deletions list
+func Shear(targetLocationIncomplete string, deviceID string) {
+	// get the full targetLocation path and remove the target
+	targetLocationComplete := backend.TargetLocationFormat(targetLocationIncomplete[1:])
+	backend.TargetIsFile(targetLocationComplete, true, 0) // needed because os.RemoveAll does not return an error if target does not exist
+	err := os.RemoveAll(targetLocationComplete)
+	if err != nil {
+		fmt.Println(backend.AnsiError + "Failed to remove local target: " + err.Error() + backend.AnsiReset)
+		os.Exit(1)
+	}
+
+	// read the devices directory
+	var deviceIDList []os.DirEntry
+	deviceIDList, err = os.ReadDir(backend.ConfigDir + backend.PathSeparator + "devices")
+	if err != nil {
+		fmt.Println(backend.AnsiError + "Failed to read the devices directory: " + err.Error() + backend.AnsiReset)
+		os.Exit(1)
+	}
+
+	// add the sheared target (incomplete, vanity) to the deletions list
+	if deviceID != "" { // if running on the server...
+		for _, device := range deviceIDList {
+			if device.Name() != deviceID {
+				_, err = os.Create(backend.ConfigDir + backend.PathSeparator + "deletions" + backend.PathSeparator + device.Name() + "\x1d" + strings.ReplaceAll(targetLocationIncomplete, backend.PathSeparator, "\x1e"))
+				if err != nil {
+					// do not print error as there is currently no way of seeing server-side errors
+					os.Exit(1)
+				}
+			}
+		}
+	} else {
+		backend.ReadConfig([]string{"sshUser"}, "0") // exits if value does not exist (indicates offline mode)
+		// if running on the client in online mode...
+		// determine client device ID (to send to server, avoids creating a deletion file for the client device)
+		deviceID = deviceIDList[0].Name()
+		// below: deviceID and targetLocationIncomplete are separated by \x1d, path separators are replaced with \x1e, and spaces are replaced with \x1f
+		getSSHOutput("libmuttonserver shear "+deviceID+"\x1d"+strings.ReplaceAll(strings.ReplaceAll(targetLocationIncomplete, backend.PathSeparator, "\x1e"), " ", "\x1f"), true)
+	}
+
+	os.Exit(0)
+}