hst: expose daemon as fs entry

This is slightly counterintuitive, but it turned out well under this framework since the daemon backs its target file.

Signed-off-by: Ophestra <cat@gensokyo.uk>

hst/fs_test.go

@@ -84,6 +84,16 @@ func TestFilesystemConfigJSON(t *testing.T) {
 		}, nil,
 			`{"type":"link","dst":"/run/current-system","linkname":"/run/current-system","dereference":true}`,
 			`{"fs":{"type":"link","dst":"/run/current-system","linkname":"/run/current-system","dereference":true},"magic":3236757504}`},
+
+		{"daemon", hst.FilesystemConfigJSON{
+			FilesystemConfig: &hst.FSDaemon{
+				Target: m("/run/user/1971/pulse/native"),
+				Exec:   m("/run/current-system/sw/bin/pipewire-pulse"),
+				Args:   []string{"-v"},
+			},
+		}, nil,
+			`{"type":"daemon","dst":"/run/user/1971/pulse/native","path":"/run/current-system/sw/bin/pipewire-pulse","args":["-v"]}`,
+			`{"fs":{"type":"daemon","dst":"/run/user/1971/pulse/native","path":"/run/current-system/sw/bin/pipewire-pulse","args":["-v"]},"magic":3236757504}`},
 	}
 
 	for _, tc := range testCases {
@@ -345,6 +355,10 @@ func (p opsAdapter) Etc(host *check.Absolute, prefix string) hst.Ops {
 	return opsAdapter{p.Ops.Etc(host, prefix)}
 }
 
+func (p opsAdapter) Daemon(target, path *check.Absolute, args ...string) hst.Ops {
+	return opsAdapter{p.Ops.Daemon(target, path, args...)}
+}
+
 func m(pathname string) *check.Absolute { return check.MustAbs(pathname) }
 func ms(pathnames ...string) []*check.Absolute {
 	as := make([]*check.Absolute, len(pathnames))