realize assure_exists (install needed package for needed command), use it in the project,

bin/epm-addrepo

@@ -21,6 +21,7 @@ epm_addrepo()
 {
 case $PMTYPE in
 	apt-rpm)
+		assure_exists apt-repo
 		sudocmd apt-repo add $pkg_filenames
 		;;
 	apt-dpkg)

bin/epm-autoremove

@@ -21,6 +21,7 @@ epm_autoremove()
 {
 case $PMTYPE in
 	apt-rpm)
+		assure_exists remove-old-kernels
 		# ALT Linux only
 		sudocmd remove-old-kernels
 		;;

bin/epm-filelist

@@ -70,6 +70,10 @@ __epm_filelist_name()
 			docmd pacman -Ql $pkg_names | sed -e "s|.* ||g"
 			return
 			;;
+		emerge)
+			assure_exists equery
+			CMD="equery files"
+			;;
 		slackpkg)
 			is_installed $pkg_names || fatal "Query filelist for non installed packages does not realized"
 			docmd awk 'BEGIN{desk=1}{if(/^FILE LIST:$/){desk=0} else if (desk==0) {print}}' /var/log/packages/${pkg_filenames}*

bin/epm-kernel_update

@@ -23,6 +23,7 @@ epm_kernel_update()
 
 	case $DISTRNAME in
 	ALTLinux)
+		assure_exists update-kernel
 		sudocmd update-kernel
 		return ;;
 	esac

bin/epm-provides

@@ -58,6 +58,7 @@ case $PMTYPE in
 		fi
 		;;
 	emerge)
+		assure_exists equery
 		CMD="equery files"
 		;;
 #	yum-rpm)

bin/epm-query_file

@@ -79,6 +79,7 @@ __do_query()
             CMD="rpm -qf"
             ;;
         emerge)
+            assure_exists equery
             CMD="equery belongs"
             ;;
         pacman)
@@ -116,6 +117,7 @@ __do_short_query()
             dpkg_print_name_version $(dpkg -S $1 | sed -e "s|:.*||" | grep -v "^diversion by")
             return ;;
         NOemerge)
+            assure_exists equery
             CMD="equery belongs"
             ;;
         NOpacman)

bin/epm-removerepo

@@ -21,6 +21,7 @@ epm_removerepo()
 {
 case $PMTYPE in
 	apt-rpm)
+		assure_exists apt-repo
 		sudocmd apt-repo rm $pkg_filenames
 		;;
 	apt-dpkg)

bin/epm-repolist

@@ -32,6 +32,7 @@ epm_repolist()
 {
 case $PMTYPE in
 	apt-rpm)
+		assure_exists apt-repo
 		docmd apt-repo list
 		;;
 	deepsolver-rpm)

bin/epm-search_file

@@ -50,6 +50,7 @@ case $PMTYPE in
 		local_content_search $pkg_filenames
 		return ;;
 	apt-dpkg)
+		assure_exists apt-file
 		sudocmd apt-file update
 		docmd apt-file search $pkg_filenames
 		return ;;

bin/epm-sh-functions

@@ -219,6 +219,29 @@ set_sudo()
 	SUDO="fatal 'Can't find sudo. Please install sudo or run epm under root.'"
 }
 
+assure_exists()
+{
+	PATH=$PATH:/sbin:/usr/sbin which $1 2>/dev/null >/dev/null && return
+	echo "Install appropriate package for $1 command..."
+	case $1 in
+		equery)
+			epm install gentoolkit
+			;;
+		apt-repo)
+			epm install apt-repo
+			;;
+		apt-file)
+			epm install apt-file
+			;;
+		update-kernel|remove-old-kernels)
+			epm install update-kernel
+			;;
+		*)
+			fatal "Internal error: Unknown binary $1 to check if exists"
+			;;
+	esac
+}
+
 # print options description from HELPCMD/HELPOPT lines in the code
 get_help()
 {

bin/epm-whatdepends

@@ -34,6 +34,7 @@ case $PMTYPE in
 		CMD="repoquery --whatrequires"
 		;;
 	emerge)
+		assure_exists equery
 		CMD="equery depends -a"
 		;;
 	*)

eepm.spec

@@ -20,9 +20,7 @@ Conflicts: epm
 
 Provides: upm
 
-%if %_vendor == "alt"
-Requires: apt rpm apt-repo
-%endif
+Requires: apt rpm
 
 %description
 Etersoft EPM is the package manager for any platform