epm assure: add AUR fallback for Arch Linux, remove assure_exist_arch

bin/epm-assure

@@ -102,7 +102,14 @@ epm_assure()
     # can't be used in epm ei case
     #docmd epm --auto install $PACKAGE || return
     load_helper epm-install
-    (repack='' pkg_names="$PACKAGE" pkg_files='' pkg_urls='' epm_install ) || return
+    if ! (repack='' pkg_names="$PACKAGE" pkg_files='' pkg_urls='' epm_install ) ; then
+        # Try AUR for Arch Linux
+        if [ "$PMTYPE" = "pacman" ] ; then
+            (repack='' pkg_names="aur/$PACKAGE" pkg_files='' pkg_urls='' epm_install ) || return
+        else
+            return 1
+        fi
+    fi
 
     # keep auto installed packages
     # https://bugzilla.altlinux.org/42240

bin/epm-repack-arch

@@ -41,7 +41,7 @@ __epm_repack_to_arch()
 {
     local pkg="$1"
 
-    assure_exist_arch debtap
+    assure_exists debtap
 
     repacked_pkg=''
 

bin/epm-sh-functions

@@ -831,19 +831,6 @@ assure_exists()
 }
 
 
-# Assure that an Arch Linux package exists, installing it if necessary
-# Args: command name
-assure_exist_arch()
-{
-    local cmd="$1"
-
-    if ! is_command "$cmd" ; then
-        info "$cmd utility not found, attempting to install it..."
-        docmd epm install "$cmd" || docmd epm install "aur/$cmd"
-    fi
-}
-
-
 assure_exists_erc()
 {
     load_helper epm-assure