[openwrt/openwrt] tools/squashfskit4: fix build on non-linux systems

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/7f0cb91d713245f4c4534ab6214ce023245d16b1

commit 7f0cb91d713245f4c4534ab6214ce023245d16b1
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Tue Sep 1 15:37:14 2020 +0200

    tools/squashfskit4: fix build on non-linux systems
    
    The xattr related function calls are linux specific
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 tools/squashfskit4/patches/0010-portability.patch | 37 +++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/tools/squashfskit4/patches/0010-portability.patch b/tools/squashfskit4/patches/0010-portability.patch
new file mode 100644
index 0000000000..2cc50ae8f0
--- /dev/null
+++ b/tools/squashfskit4/patches/0010-portability.patch
@@ -0,0 +1,37 @@
+--- a/squashfs-tools/xattr.c
++++ b/squashfs-tools/xattr.c
+@@ -113,6 +113,7 @@ static int get_prefix(struct xattr_list
+ 
+ static int read_xattrs_from_system(char *filename, struct xattr_list **xattrs)
+ {
++#if defined(linux)
+ 	ssize_t size, vsize;
+ 	char *xattr_names, *p;
+ 	int i;
+@@ -222,6 +223,10 @@ failed:
+ 	free(xattr_list);
+ 	free(xattr_names);
+ 	return 0;
++#else
++	*xattrs = NULL;
++	return 0;
++#endif
+ }
+ 
+ 
+--- a/squashfs-tools/unsquashfs_xattr.c
++++ b/squashfs-tools/unsquashfs_xattr.c
+@@ -34,6 +34,7 @@ extern int user_xattrs;
+ 
+ void write_xattr(char *pathname, unsigned int xattr)
+ {
++#if defined(linux)
+ 	unsigned int count;
+ 	struct xattr_list *xattr_list;
+ 	int i;
+@@ -136,4 +137,5 @@ void write_xattr(char *pathname, unsigne
+ 	}
+ 
+ 	free_xattr(xattr_list, count);
++#endif
+ }