drop samber/mo dependency

LICENSE_DEPENDENCIES.md

@@ -14926,36 +14926,6 @@ SOFTWARE.
 ```
 
 
-## github.com/samber/mo
-
-**License:** MIT
-
-```
-MIT License
-
-Copyright (c) 2022 Samuel Berthe
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
-
-```
-
-
 ## github.com/secure-systems-lab/go-securesystemslib
 
 **License:** MIT

go.mod

@@ -37,7 +37,6 @@ require (
 	github.com/pelletier/go-toml/v2 v2.1.0
 	github.com/pkg/errors v0.9.1
 	github.com/samber/lo v1.38.1
-	github.com/samber/mo v1.8.0
 	github.com/seccomp/libseccomp-golang v0.10.0
 	github.com/shopspring/decimal v1.3.1
 	github.com/sigstore/sigstore v1.7.3

go.sum

@@ -460,8 +460,6 @@ github.com/safchain/ethtool v0.3.0 h1:gimQJpsI6sc1yIqP/y8GYgiXn/NjgvpM0RNoWLVVmP
 github.com/safchain/ethtool v0.3.0/go.mod h1:SA9BwrgyAqNo7M+uaL6IYbxpm5wk3L7Mm6ocLW+CJUs=
 github.com/samber/lo v1.38.1 h1:j2XEAqXKb09Am4ebOg31SpvzUTTs6EN3VfgeLUhPdXM=
 github.com/samber/lo v1.38.1/go.mod h1:+m/ZKRl6ClXCE2Lgf3MsQlWfh4bn1bz6CXEOxnEXnEA=
-github.com/samber/mo v1.8.0 h1:vYjHTfg14JF9tD2NLhpoUsRi9bjyRoYwa4+do0nvbVw=
-github.com/samber/mo v1.8.0/go.mod h1:BfkrCPuYzVG3ZljnZB783WIJIGk1mcZr9c9CPf8tAxs=
 github.com/sebdah/goldie/v2 v2.5.3 h1:9ES/mNN+HNUbNWpVAlrzuZ7jE+Nrczbj8uFRjM7624Y=
 github.com/seccomp/libseccomp-golang v0.10.0 h1:aA4bp+/Zzi0BnWZ2F1wgNBs5gTpm+na2rWM6M9YjLpY=
 github.com/seccomp/libseccomp-golang v0.10.0/go.mod h1:JA8cRccbGaA1s33RQf7Y1+q9gHmZX1yB/z9WDN1C6fg=

internal/pkg/util/fs/fuse/fuse_mount_linux.go

@@ -13,7 +13,6 @@ import (
 	"strings"
 
 	"github.com/samber/lo"
-	"github.com/samber/mo"
 	"github.com/sylabs/singularity/v4/internal/pkg/util/bin"
 	"github.com/sylabs/singularity/v4/pkg/image"
 	"github.com/sylabs/singularity/v4/pkg/sylog"
@@ -154,13 +153,13 @@ func (i ImageMount) generateMountOpts() ([]string, error) {
 
 	// Create a map of the extra mount options that have been requested, so we
 	// can catch attempts to overwrite builtin struct fields.
-	extraOptsMap := lo.SliceToMap(i.ExtraOpts, func(s string) (string, mo.Option[string]) {
+	extraOptsMap := lo.SliceToMap(i.ExtraOpts, func(s string) (string, *string) {
 		splitted := strings.SplitN(s, "=", 2)
 		if len(splitted) < 2 {
-			return strings.ToLower(s), mo.None[string]()
+			return strings.ToLower(s), nil
 		}
 
-		return strings.ToLower(splitted[0]), mo.Some(splitted[1])
+		return strings.ToLower(splitted[0]), &splitted[1]
 	})
 
 	if maps.HasKey(extraOptsMap, "ro") {
@@ -202,11 +201,11 @@ func (i ImageMount) generateMountOpts() ([]string, error) {
 	return opts, nil
 }
 
-func rebuildOpt(k string, v mo.Option[string]) string {
-	if v.IsAbsent() {
+func rebuildOpt(k string, v *string) string {
+	if v == nil {
 		return k
 	}
-	return k + "=" + v.MustGet()
+	return k + "=" + *v
 }
 
 func (i ImageMount) GetMountPoint() string {