Added basic support for FreeBSD.

Freebsd-support: Change bash shebang to use /usr/bin/env

Freebsd-support: Fix go vet "undefined" fixes when running make ci

freebsd: stub xattr functions

/proc/PID/fd does not exist on freebsd.

freebsd-support: modify FchmodatNofollow for FreeBSD

FreeBSD supports the Fchmodat system call, with the AT_SYMLINK_NOFOLLOW
flag. FchmodatNofollow has been modified to use this system call and
flag.

freebsd-support: PR changes and fixes

* Functions in fusefrontend_reverse/node_xattr_freebsd.go have been
  stubbed for now.

* asuser_freebsd.go updated to only run f() when context is nil;
  otherwise log a warning and return an error.

* emulate.go build flags updated, and FreeBSD specific version added.

* sys_freebsd.go bug in Renameat2 with RENAME_EXCHANGE flag fixed.
  FreeBSD does not support atomic file swapping, so this flag now
  returns an error.

* unix2syscall and atime is identical between FreeBSD and Darwin,
  updated filenames so Go will build the file for FreeBSD and Mac OS.

freebsd-support: Addressed more PR comments and fixed build tags

1 files changed, 33 insertions, 0 deletions

diff --git a/internal/fusefrontend/node_xattr_freebsd.go b/internal/fusefrontend/node_xattr_freebsd.go
new file mode 100644
index 0000000..9698283
--- /dev/null
+++ b/internal/fusefrontend/node_xattr_freebsd.go
@@ -0,0 +1,33 @@
+package fusefrontend
+
+import (
+	"golang.org/x/sys/unix"
+
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+const noSuchAttributeError = unix.ENOATTR
+
+func filterXattrSetFlags(flags int) int {
+	return flags
+}
+
+func (n *Node) getXAttr(cAttr string) (out []byte, errno unix.Errno) {
+	// TODO
+	return nil, unix.EOPNOTSUPP
+}
+
+func (n *Node) setXAttr(context *fuse.Context, cAttr string, cData []byte, flags uint32) (errno unix.Errno) {
+	// TODO
+	return unix.EOPNOTSUPP
+}
+
+func (n *Node) removeXAttr(cAttr string) (errno unix.Errno) {
+	// TODO
+	return unix.EOPNOTSUPP
+}
+
+func (n *Node) listXAttr() (out []string, errno unix.Errno) {
+	// TODO
+	return nil, unix.EOPNOTSUPP
+}