1 files changed, 78 insertions, 0 deletions
diff --git a/internal/system/acl.go b/internal/system/acl.go
new file mode 100644
index 00000000..9c89752b
--- /dev/null
+++ b/internal/system/acl.go
@@ -0,0 +1,78 @@
+package system
+
+import (
+	"fmt"
+	"slices"
+
+	"git.ophivana.moe/cat/fortify/acl"
+	"git.ophivana.moe/cat/fortify/internal/fmsg"
+	"git.ophivana.moe/cat/fortify/internal/state"
+	"git.ophivana.moe/cat/fortify/internal/verbose"
+)
+
+// UpdatePerm appends an ephemeral acl update Op.
+func (sys *I) UpdatePerm(path string, perms ...acl.Perm) {
+	sys.UpdatePermType(Process, path, perms...)
+}
+
+// UpdatePermType appends an acl update Op.
+func (sys *I) UpdatePermType(et state.Enablement, path string, perms ...acl.Perm) {
+	sys.lock.Lock()
+	defer sys.lock.Unlock()
+
+	sys.ops = append(sys.ops, &ACL{et, path, perms})
+}
+
+type ACL struct {
+	et    state.Enablement
+	path  string
+	perms []acl.Perm
+}
+
+func (a *ACL) Type() state.Enablement {
+	return a.et
+}
+
+func (a *ACL) apply(sys *I) error {
+	verbose.Println("applying ACL", a, "uid:", sys.uid, "type:", TypeString(a.et), "path:", a.path)
+	return fmsg.WrapErrorSuffix(acl.UpdatePerm(a.path, sys.uid, a.perms...),
+		fmt.Sprintf("cannot apply ACL entry to %q:", a.path))
+}
+
+func (a *ACL) revert(sys *I, ec *Criteria) error {
+	if ec.hasType(a) {
+		verbose.Println("stripping ACL", a, "uid:", sys.uid, "type:", TypeString(a.et), "path:", a.path)
+		return fmsg.WrapErrorSuffix(acl.UpdatePerm(a.path, sys.uid),
+			fmt.Sprintf("cannot strip ACL entry from %q:", a.path))
+	} else {
+		verbose.Println("skipping ACL", a, "uid:", sys.uid, "tag:", TypeString(a.et), "path:", a.path)
+		return nil
+	}
+}
+
+func (a *ACL) Is(o Op) bool {
+	a0, ok := o.(*ACL)
+	return ok && a0 != nil &&
+		a.et == a0.et &&
+		a.path == a0.path &&
+		slices.Equal(a.perms, a0.perms)
+}
+
+func (a *ACL) Path() string {
+	return a.path
+}
+
+func (a *ACL) String() string {
+	var s = []byte("---")
+	for _, p := range a.perms {
+		switch p {
+		case acl.Read:
+			s[0] = 'r'
+		case acl.Write:
+			s[1] = 'w'
+		case acl.Execute:
+			s[2] = 'x'
+		}
+	}
+	return string(s)
+}