api: anything_installed_from_uri_suite_component multiple factor of…

… magnitude speedup

instead of checking the apt-cache policy on each package individually, check all installed packages that exist in a repo at once. this results in a multiple factor of magnitude speedup on large repositories (eg: debian/ubuntu main repositories) from minutes to seconds

api

@@ -246,29 +246,21 @@ anything_installed_from_uri_suite_component() { #Given an apt repository uri, su
   local repofile
   for repofile in $repofiles ;do
     #search the repo-file for installed packages
+
+    local packages_in_repo="$(grep '^Package' "$repofile" | awk '{print $2}' | sort)"
+    local installed_packages="$(apt list --installed 2>/dev/null | tail -n +2 | awk -F/ '{print $1}')"
+    local apt_cache_policy_output="$(echo "$packages_in_repo" | list_intersect "$installed_packages" | tr '\n' ' ' | xargs -r apt-cache policy)"
 
-    grep '^Package' "$repofile" | awk '{print $2}' | while read -r package ;do
-      if package_installed "$package" ;then
-        #this package is installed; check if the version available on this repo is the current version (prevents false positives package being installed from another uri/suite/component)
-        #component is an optional specification
-        if [ -z "$3" ]; then
-          if apt-cache policy "$package" | grep -B1 "$(echo "$1" | sed 's+.*://++g' | sed "s,/$,,") $2" | head -n1 | awk '{print $1}' | grep -Fq '***' ;then
-            echo "Package installed: $package"
-            exit 1
-          fi
-        else
-          if apt-cache policy "$package" | grep -B1 "$(echo "$1" | sed 's+.*://++g' | sed "s,/$,,") $2/$3" | head -n1 | awk '{print $1}' | grep -Fq '***' ;then
-            echo "Package installed: $package"
-            exit 1
-          fi
-        fi
+    if [ -z "$3" ]; then
+      if echo "$apt_cache_policy_output" | grep -B1 "$(echo "$1" | sed 's+.*://++g' | sed "s,/$,,") $2" | awk '{print $1}' | grep -Fq '***' ;then
+        found=1
+        break
+      fi
+    else
+      if echo "$apt_cache_policy_output" | grep -B1 "$(echo "$1" | sed 's+.*://++g' | sed "s,/$,,") $2/$3" | awk '{print $1}' | grep -Fq '***' ;then
+        found=1
+        break
       fi
-    done #if exit code is 1, search was successful. If exit code is 0, no packages from the repo were installed.
-
-    found=$?
-
-    if [ $found == 1 ];then
-      break
     fi
   done