assure we have a command rpm/dpkg when work with a package file

bin/epm-changelog

@@ -34,6 +34,7 @@ __epm_changelog_files()
 	# TODO: detect every file
 	case $(get_package_type $1) in
 		rpm)
+			assure_exists rpm
 			docmd_foreach "rpm -p --changelog" $@ | less
 			;;
 #		deb)

bin/epm-checkpkg

@@ -24,9 +24,11 @@ check_pkg_integrity()
 
 	case $(get_package_type $PKG) in
 	rpm)
+		assure_exists rpm
 		docmd rpm --checksig $PKG
 		;;
 	deb)
+		assure_exists dpkg
 		# FIXME: debsums -ca package ?
 		docmd dpkg --contents $PKG >/dev/null && echo "Package $PKG is correct."
 		;;

bin/epm-conflicts

@@ -25,6 +25,7 @@ epm_conflicts_files()
 
 	case $(get_package_type $pkg_files) in
 		rpm)
+			assure_exists rpm
 			docmd "rpm -q --conflicts -p" $pkg_files
 			;;
 		#deb)

bin/epm-filelist

@@ -64,9 +64,11 @@ __epm_filelist_file()
 	# TODO: allow a new packages
 	case $(get_package_type $1) in
 		rpm)
+			assure_exists rpm
 			CMD="rpm -qlp"
 			;;
 		deb)
+			assure_exists dpkg
 			CMD="dpkg --contents"
 			;;
 		*)

bin/epm-provides

@@ -27,9 +27,11 @@ epm_provides_files()
 
 	case $PKGTYPE in
 		rpm)
+			assure_exists rpm
 			docmd rpm -q --provides -p $pkg_files
 			;;
 		deb)
+			assure_exists dpkg
 			# FIXME: will we provide ourself?
 			docmd dpkg -I $pkg_files | grep "^ *Provides:" | sed "s|^ *Provides:||g"
 			;;

bin/epm-requires

@@ -27,9 +27,11 @@ epm_requires_files()
 
 	case "$PKGTYPE" in
 		rpm)
+			assure_exists rpm
 			docmd rpm -q --requires -p $pkg_files
 			;;
 		deb)
+			assure_exists dpkg
 			a= docmd dpkg -I $pkg_files | grep "^ *Depends:" | sed "s|^ *Depends:||g"
 			;;
 		*)