Only enable the tar and gzip modules when initialising libarchive.

This means you will only be able to run pkgadd/pkginfo on gzipped tarballs
but not on tarballs that were compressed with eg bzip2 or xz.

Makefile

@@ -32,7 +32,7 @@ CXXFLAGS += -DNDEBUG
 CXXFLAGS += -O2 -Wall -pedantic -D_GNU_SOURCE -DVERSION=\"$(VERSION)\" \
 	    -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
 
-LDFLAGS += -static -larchive -lz -lbz2
+LDFLAGS += -static -larchive -lz
 
 OBJECTS = main.o pkgutil.o pkgadd.o pkgrm.o pkginfo.o
 

pkgutil.cc

@@ -44,8 +44,8 @@
 #include <archive_entry.h>
 
 #define INIT_ARCHIVE(ar) \
-	archive_read_support_compression_all((ar)); \
-	archive_read_support_format_all((ar))
+	archive_read_support_compression_gzip((ar)); \
+	archive_read_support_format_tar((ar))
 
 using __gnu_cxx::stdio_filebuf;