erofs-utils: introduce fsck.erofs

I made a fsck.erofs tool to check erofs filesystem image integrity
and calculate filesystem compression ratio.
Here are options to support now.

fsck.erofs [options] IMAGE
-V      print the version number of fsck.erofs and exit.
-d#     set output message level to # (maximum 9)
-p      print total compression ratio of all files
-c      check if all compressed files are well decompressed

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Daeho Jeong <[email protected]>
Signed-off-by: Gao Xiang <[email protected]>

.gitignore

@@ -30,3 +30,4 @@ stamp-h1
 /mkfs/mkfs.erofs
 /fuse/erofsfuse
 /dump/dump.erofs
+/fsck/fsck.erofs

Makefile.am

@@ -2,7 +2,7 @@
 
 ACLOCAL_AMFLAGS = -I m4
 
-SUBDIRS = man lib mkfs dump
+SUBDIRS = man lib mkfs dump fsck
 if ENABLE_FUSE
 SUBDIRS += fuse
 endif

configure.ac

@@ -347,5 +347,6 @@ AC_CONFIG_FILES([Makefile
 		 lib/Makefile
 		 mkfs/Makefile
 		 dump/Makefile
-		 fuse/Makefile])
+		 fuse/Makefile
+		 fsck/Makefile])
 AC_OUTPUT

fsck/Makefile.am

@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Makefile.am
+
+AUTOMAKE_OPTIONS = foreign
+bin_PROGRAMS     = fsck.erofs
+AM_CPPFLAGS = ${libuuid_CFLAGS}
+fsck_erofs_SOURCES = main.c
+fsck_erofs_CFLAGS = -Wall -Werror -I$(top_srcdir)/include
+fsck_erofs_LDADD = $(top_builddir)/lib/liberofs.la ${libselinux_LIBS} ${libuuid_LIBS} ${liblz4_LIBS}