From 33d5e09ccbf2bafe3d06f615b11bf29d07f47784 Mon Sep 17 00:00:00 2001
From: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Date: Sun, 11 Aug 2019 13:59:13 +0200
Subject: Add gensquashfs option to read xattrs from input files

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
---
 lib/fstree/fstree_from_dir.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

(limited to 'lib')

diff --git a/lib/fstree/fstree_from_dir.c b/lib/fstree/fstree_from_dir.c
index 7301d91..4b89272 100644
--- a/lib/fstree/fstree_from_dir.c
+++ b/lib/fstree/fstree_from_dir.c
@@ -10,6 +10,9 @@
 #include "util.h"
 
 #include <sys/types.h>
+#ifdef HAVE_SYS_XATTR_H
+#include <sys/xattr.h>
+#endif
 #include <dirent.h>
 #include <unistd.h>
 #include <string.h>
@@ -52,6 +55,75 @@ fail:
 	return NULL;
 }
 
+#ifdef HAVE_SYS_XATTR_H
+static int populate_xattr(fstree_t *fs, tree_node_t *node)
+{
+	char *key, *value = NULL, *buffer = NULL;
+	ssize_t buflen, vallen, keylen;
+
+	buflen = listxattr(node->name, NULL, 0);
+
+	if (buflen < 0) {
+		perror("listxattr");
+		return -1;
+	}
+
+	if (buflen == 0)
+		return 0;
+
+	buffer = malloc(buflen);
+	if (buffer == NULL) {
+		perror("xattr name buffer");
+		return -1;
+	}
+
+	buflen = listxattr(node->name, buffer, buflen);
+	if (buflen == -1) {
+		perror("listxattr");
+		goto fail;
+	}
+
+	key = buffer;
+	while (buflen > 0) {
+		vallen = getxattr(node->name, key, NULL, 0);
+		if (vallen == -1)
+			goto fail;
+
+		if (vallen > 0) {
+			value = calloc(1, vallen + 1);
+			if (value == NULL) {
+				perror("xattr value buffer");
+				goto fail;
+			}
+
+			vallen = getxattr(node->name, key, value, vallen);
+			if (vallen == -1) {
+				perror("getxattr");
+				goto fail;
+			}
+
+			value[vallen] = 0;
+			if (fstree_add_xattr(fs, node, key, value))
+				goto fail;
+
+			free(value);
+			value = NULL;
+		}
+
+		keylen = strlen(key) + 1;
+		buflen -= keylen;
+		key += keylen;
+	}
+
+	free(buffer);
+	return 0;
+fail:
+	free(value);
+	free(buffer);
+	return -1;
+}
+#endif
+
 static int populate_dir(fstree_t *fs, tree_node_t *root, dev_t devstart,
 			unsigned int flags)
 {
@@ -115,6 +187,13 @@ static int populate_dir(fstree_t *fs, tree_node_t *root, dev_t devstart,
 			goto fail;
 		}
 
+#ifdef HAVE_SYS_XATTR_H
+		if (flags & DIR_SCAN_READ_XATTR) {
+			if (populate_xattr(fs, n))
+				return -1;
+		}
+#endif
+
 		free(extra);
 		extra = NULL;
 	}
-- 
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