Allow running PIE for any PHP version

Author: PhrozenByte

build.sh

@@ -326,11 +326,6 @@ cmd buildah run "$CONTAINER" -- \
         "/usr/local/bin/pie-latest" "99"
 
 for PHP_MILESTONE in "${PHP_MILESTONES[@]}"; do
-    case "$PHP_MILESTONE" in
-        "5.6"|"7.0"|"7.1"|"7.2"|"7.3"|"7.4"|"8.0") continue ;;
-        *) ;;
-    esac
-
     echo + "ln -s pie-php $(quote "…/usr/local/bin/pie-php$PHP_MILESTONE")" >&2
     ln -s pie-php "$MOUNT/usr/local/bin/pie-php$PHP_MILESTONE"
 
@@ -339,13 +334,8 @@ for PHP_MILESTONE in "${PHP_MILESTONES[@]}"; do
             "/usr/local/bin/pie-php$PHP_MILESTONE" "${PHP_MILESTONE//./}"
 done
 
-if [ -e "$MOUNT/usr/local/bin/pie-php$PHP_LATEST_MILESTONE" ]; then
-    cmd buildah run "$CONTAINER" -- \
-        update-alternatives --set pie "/usr/local/bin/pie-php$PHP_LATEST_MILESTONE"
-else
-    cmd buildah run "$CONTAINER" -- \
-        update-alternatives --auto pie
-fi
+cmd buildah run "$CONTAINER" -- \
+    update-alternatives --set pie "/usr/local/bin/pie-php$PHP_LATEST_MILESTONE"
 
 # install Composer
 php_composer_install "$CONTAINER" "latest-stable" "/usr/local/bin/composer-latest"

src/entrypoint.sh

@@ -85,9 +85,7 @@ if [ "$1" == "php-fpm" ]; then
         [ ! -e "/etc/php/$PHP_MILESTONE/fpm/pool.d/www.conf" ] \
             || update-alternatives --quiet --set php-fpm_www.sock "/run/php-fpm/$PHP_MILESTONE/php-fpm_www.sock"
 
-        [ -e "/usr/local/bin/pie-php$PHP_MILESTONE" ] \
-            && update-alternatives --quiet --set pie "/usr/local/bin/pie-php$PHP_MILESTONE" \
-            || update-alternatives --quiet --auto pie
+        update-alternatives --quiet --set pie "/usr/local/bin/pie-php$PHP_MILESTONE"
         update-alternatives --quiet --set composer "/usr/local/bin/composer-php$PHP_MILESTONE"
         update-alternatives --quiet --set phive "/usr/local/bin/phive-php$PHP_MILESTONE"
     fi

src/usr/local/bin/pie-php

@@ -12,10 +12,38 @@
 
 PHP="php"
 PIE="pie-latest"
+PIE_ARGS=()
 
 if [[ "$(basename "$0")" =~ ^pie-(php[0-9]\.[0-9])$ ]]; then
     PHP="${BASH_REMATCH[1]}"
-    # PIE never supported anything else than PHP 8.1+ only
+
+    case "$PHP" in
+        "php5.6"|"php7.0"|"php7.1"|"php7.2"|"php7.3"|"php7.4"|"php8.0")
+            # PIE itself must run with PHP 8.1 and later, but it can install extensions for any PHP version
+            # in case of such old PHP version, run PIE with PHP 8.1 (earliest supported version)
+            # and tell PIE what `php-config` and `phpize` binaries to use instead
+            PHP_VERSION="${PHP:3}"
+
+            PHP_CONFIG="php-config$PHP_VERSION"
+            PHP_CONFIG_PATH="$(type -P "$PHP_CONFIG" 2> /dev/null)"
+            [ -n "$PHP_CONFIG_PATH" ] && [ -x "$PHP_CONFIG_PATH" ] \
+                || { echo "Invalid php-config executable \`$PHP_CONFIG\`: No such executable" >&2; exit 1; }
+
+            PHPIZE="phpize$PHP_VERSION"
+            PHPIZE_PATH="$(type -P "$PHPIZE" 2> /dev/null)"
+            [ -n "$PHPIZE_PATH" ] && [ -x "$PHPIZE_PATH" ] \
+                || { echo "Invalid phpize executable \`$PHPIZE\`: No such executable" >&2; exit 1; }
+
+            PIE_ARGS+=(
+                --with-php-config="$PHP_CONFIG_PATH"
+                --with-phpize-path="$PHPIZE_PATH"
+            )
+
+            PHP="php8.1"
+            ;;
+
+        *) ;;
+    esac
 fi
 
 PHP_PATH="$(type -P "$PHP" 2> /dev/null)"
@@ -26,4 +54,4 @@ PIE_PATH="$(type -P "$PIE" 2> /dev/null)"
 [ -n "$PIE_PATH" ] && [ -x "$PIE_PATH" ] \
     || { echo "Invalid PIE executable \`$PIE\`: No such executable" >&2; exit 1; }
 
-exec "$PHP_PATH" -f "$PIE_PATH" -- "$@"
+exec "$PHP_PATH" -f "$PIE_PATH" -- "${PIE_ARGS[@]}" "$@"