From c73f1cbde0f59287d56bfa603b8fd9a70d7fa2d0 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 23 Mar 2021 17:58:56 +0100
Subject: sync with ikiwiki 3.20180228

---
 IkiWiki/Plugin/img.pm | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/IkiWiki/Plugin/img.pm b/IkiWiki/Plugin/img.pm
index 79cfba2..b858243 100644
--- a/IkiWiki/Plugin/img.pm
+++ b/IkiWiki/Plugin/img.pm
@@ -125,7 +125,14 @@ sub preprocess (@) {
 	}
 	else {
 		# allow ImageMagick to auto-detect (potentially dangerous)
-		$format = '';
+		my $im = Image::Magick->new();
+		my $r = $im->Ping(file => $in);
+		if ($r) {
+			$format = lc $r;
+		}
+		else {
+			error sprintf(gettext("failed to determine format of %s"), $file);
+		}
 	}
 
 	error sprintf(gettext("%s image processing disabled in img_allowed_formats configuration"), $format ? $format : "\"$extension\"") unless allowed($format ? $format : "everything");
-- 
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