package/erofs-utils: new package

This patch adds EROFS userspace tool erofs-utils to buildroot,
which can be used to generate EROFS images.

Signed-off-by: Gao Xiang <hsiangkao@aol.com>
[yann.morin.1998@free.fr:
  - add explicit --enable-lz4
  - explain why autoreconf
  - add DEVELOPPER entry
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

DEVELOPERS

@@ -980,6 +980,9 @@ F:	package/qt5/qt5webengine/
 F:	package/qt5/qt5webkit/
 F:	package/qt5/qt5webkit-examples/
 
+N:	Gao Xiang <hsiangkao@aol.com>
+F:	package/erofs-utils/
+
 N:	Gary Bisson <bisson.gary@gmail.com>
 F:	board/boundarydevices/
 F:	configs/nitrogen*

package/Config.in

@@ -196,6 +196,7 @@ menu "Filesystem and flash utilities"
 	source "package/e2fsprogs/Config.in"
 	source "package/e2tools/Config.in"
 	source "package/ecryptfs-utils/Config.in"
+	source "package/erofs-utils/Config.in"
 	source "package/exfat/Config.in"
 	source "package/exfat-utils/Config.in"
 	source "package/f2fs-tools/Config.in"

package/Config.in.host

@@ -18,6 +18,7 @@ menu "Host utilities"
 	source "package/dtc/Config.in.host"
 	source "package/e2fsprogs/Config.in.host"
 	source "package/e2tools/Config.in.host"
+	source "package/erofs-utils/Config.in.host"
 	source "package/eudev/Config.in.host"
 	source "package/f2fs-tools/Config.in.host"
 	source "package/faketime/Config.in.host"

package/erofs-utils/0001-erofs-utils-fix-configure.ac.patch

@@ -0,0 +1,33 @@
+From eefd95b37e1042992cb07bec1ac3f6dbe199d8f0 Mon Sep 17 00:00:00 2001
+From: Haruue Icymoon <i@haruue.moe>
+Date: Fri, 22 Nov 2019 16:58:59 +0800
+Subject: [PATCH] erofs-utils: fix configure.ac
+
+./configure will fail when --with-lz4-libdir is not set, since
+$with_lz4_libdir will be an empty string and generate an empty -L
+into LDFLAGS. This patch fixes it.
+
+Link: https://lore.kernel.org/r/20191122085859.GA2414688@usamimi.host.haruue.net
+Signed-off-by: Haruue Icymoon <i@haruue.moe>
+Fixes: d51c2d043773 ("erofs-utils: introduce lz4/lz4hc compression algorithm")
+Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
+---
+ configure.ac | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/configure.ac b/configure.ac
+index f925358..870dfb9 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -174,7 +174,7 @@ if test "x$enable_lz4" = "xyes"; then
+ 
+   if test "x${have_lz4h}" = "xyes" ; then
+     saved_LDFLAGS=${LDFLAGS}
+-    LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
++    test -z "${with_lz4_libdir}" || LDFLAGS="-L$with_lz4_libdir ${LDFLAGS}"
+     AC_CHECK_LIB(lz4, LZ4_compress_destSize, [
+       have_lz4="yes"
+       have_lz4hc="yes"
+-- 
+2.20.1
+

package/erofs-utils/0002-erofs-utils-avoid-_LARGEFILE64_SOURCE-and-_GNU_SOURC.patch

@@ -0,0 +1,58 @@
+From 41d6c984699f30c11e8c92550239bbe5a3e5ada1 Mon Sep 17 00:00:00 2001
+From: Gao Xiang <gaoxiang25@huawei.com>
+Date: Sat, 14 Mar 2020 17:05:37 +0800
+Subject: [PATCH] erofs-utils: avoid _LARGEFILE64_SOURCE and _GNU_SOURCE
+ redefinition
+
+This patch can be used to resolve the following build errors:
+
+compress.c:10: error: "_LARGEFILE64_SOURCE" redefined [-Werror]
+ #define _LARGEFILE64_SOURCE
+
+<command-line>: note: this is the location of the previous definition
+
+io.c:9: error: "_LARGEFILE64_SOURCE" redefined [-Werror]
+ #define _LARGEFILE64_SOURCE
+
+<command-line>: note: this is the location of the previous definition
+
+Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
+---
+ lib/compress.c | 2 ++
+ lib/io.c       | 4 ++++
+ 2 files changed, 6 insertions(+)
+
+diff --git a/lib/compress.c b/lib/compress.c
+index 8337487..b14ff17 100644
+--- a/lib/compress.c
++++ b/lib/compress.c
+@@ -7,7 +7,9 @@
+  * Created by Miao Xie <miaoxie@huawei.com>
+  * with heavy changes by Gao Xiang <gaoxiang25@huawei.com>
+  */
++#ifndef _LARGEFILE64_SOURCE
+ #define _LARGEFILE64_SOURCE
++#endif
+ #include <string.h>
+ #include <stdlib.h>
+ #include <unistd.h>
+diff --git a/lib/io.c b/lib/io.c
+index 52f9424..5b998d8 100644
+--- a/lib/io.c
++++ b/lib/io.c
+@@ -6,8 +6,12 @@
+  *             http://www.huawei.com/
+  * Created by Li Guifu <bluce.liguifu@huawei.com>
+  */
++#ifndef _LARGEFILE64_SOURCE
+ #define _LARGEFILE64_SOURCE
++#endif
++#ifndef _GNU_SOURCE
+ #define _GNU_SOURCE
++#endif
+ #include <sys/stat.h>
+ #include <sys/ioctl.h>
+ #include "erofs/io.h"
+-- 
+2.20.1
+

package/erofs-utils/Config.in

@@ -0,0 +1,16 @@
+config BR2_PACKAGE_EROFS_UTILS
+	bool "erofs-utils"
+	help
+	  Userspace utilities for EROFS filesystem
+
+	  https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git
+
+if BR2_PACKAGE_EROFS_UTILS
+
+config BR2_PACKAGE_EROFS_UTILS_LZ4
+	bool "lz4 support"
+	select BR2_PACKAGE_LZ4
+	help
+	  Support LZ4 compression algorithm
+
+endif

package/erofs-utils/Config.in.host

@@ -0,0 +1,6 @@
+config BR2_PACKAGE_HOST_EROFS_UTILS
+	bool "host erofs-utils"
+	help
+	  Userspace utilities for EROFS filesystem
+
+	  https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git

package/erofs-utils/erofs-utils.hash

@@ -0,0 +1,3 @@
+# Locally computed
+sha256 508ee818dc6a02cf986647e37cb991b76f7b3e7ea303ffc9e980772de68f3b10  erofs-utils-1.0.tar.gz
+sha256 feee3b3157dcdf78d4f50edefbd5dd7adf8b6d52c11bfaaa746a85a373256713  COPYING

package/erofs-utils/erofs-utils.mk

@@ -0,0 +1,27 @@
+################################################################################
+#
+# erofs-utils
+#
+################################################################################
+
+EROFS_UTILS_VERSION = 1.0
+EROFS_UTILS_SITE = https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git/snapshot
+EROFS_UTILS_LICENSE = GPL-2.0+
+EROFS_UTILS_LICENSE_FILES = COPYING
+
+# From a git tree: no generated autotools files
+# Also: 0001-erofs-utils-fix-configure.ac.patch
+EROFS_UTILS_AUTORECONF = YES
+
+ifeq ($(BR2_PACKAGE_EROFS_UTILS_LZ4),y)
+EROFS_UTILS_DEPENDENCIES += lz4
+EROFS_UTILS_CONF_OPTS += --enable-lz4
+else
+EROFS_UTILS_CONF_OPTS += --disable-lz4
+endif
+
+HOST_EROFS_UTILS_DEPENDENCIES = host-lz4
+HOST_EROFS_UTILS_CONF_OPTS += --enable-lz4
+
+$(eval $(autotools-package))
+$(eval $(host-autotools-package))