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diff --git a/tests/t0112-submodule-links.sh b/tests/t0112-submodule-links.sh
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+++ b/tests/t0112-submodule-links.sh
@@ -0,0 +1,109 @@
+#!/bin/sh
+
+# Submodule rows can derive their links from the .gitmodules entry at the
+# shown revision once enable-gitmodules-links is set. The url is matched
+# against the repositories this instance serves first, so ssh and relative
+# urls still land on an internal page, a plain web url is linked directly,
+# an ssh url to a known host is rewritten to its web form, and anything
+# else stays unlinked with the url offered as a tooltip.
+
+test_description='Check submodule links derived from .gitmodules'
+. ./setup.sh
+
+test_expect_success 'set up a parent repo with submodules' '
+	mkrepo repos/subtarget 1 &&
+	mkrepo repos/subparent 1 &&
+	(
+		cd repos/subparent &&
+		sub=$(git rev-parse HEAD) &&
+		git update-index --add --cacheinfo 160000,$sub,local-ssh &&
+		git update-index --add --cacheinfo 160000,$sub,sibling &&
+		git update-index --add --cacheinfo 160000,$sub,forge-https &&
+		git update-index --add --cacheinfo 160000,$sub,forge-ssh &&
+		git update-index --add --cacheinfo 160000,$sub,opaque &&
+		git update-index --add --cacheinfo 160000,$sub,cgit-host &&
+		cat >.gitmodules <<-\EOF &&
+		[submodule "local-ssh"]
+			path = local-ssh
+			url = git@example.com:mirrors/subtarget.git
+		[submodule "sibling"]
+			path = sibling
+			url = ../subtarget.git
+		[submodule "forge-https"]
+			path = forge-https
+			url = https://github.com/example/project.git
+		[submodule "forge-ssh"]
+			path = forge-ssh
+			url = git@github.com:example/other.git
+		[submodule "opaque"]
+			path = opaque
+			url = git@private.example.com:closed/thing.git
+		[submodule "cgit-host"]
+			path = cgit-host
+			url = https://git.kernel.org/pub/scm/git/git.git
+		EOF
+		git add .gitmodules &&
+		git commit -m submodules
+	) &&
+	{
+		echo "virtual-root=/" &&
+		echo "cache-size=0" &&
+		echo "enable-gitmodules-links=1" &&
+		echo "repo.url=subparent" &&
+		echo "repo.path=$PWD/repos/subparent/.git" &&
+		echo "repo.url=subtarget" &&
+		echo "repo.path=$PWD/repos/subtarget/.git"
+	} >subrc
+'
+
+test_expect_success 'generate subparent/tree' '
+	CGIT_CONFIG="$PWD/subrc" QUERY_STRING="url=subparent/tree/" cgit >tmp
+'
+
+test_expect_success 'an ssh url served here links to the local repo' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=./subtarget/tree/?id=$sub.>local-ssh</a>" tmp
+'
+
+test_expect_success 'its hash links to the local commit page' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=./subtarget/commit/?id=$sub." tmp
+'
+
+test_expect_success 'a relative url resolves against this repository' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=./subtarget/tree/?id=$sub.>sibling</a>" tmp
+'
+
+test_expect_success 'a web url is linked as it is' '
+	grep "href=.https://github.com/example/project.git.>forge-https</a>" tmp
+'
+
+test_expect_success 'a known forge hash links to its commit page' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=.https://github.com/example/project/commit/$sub." tmp
+'
+
+test_expect_success 'an ssh url to a known forge is rewritten' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=.https://github.com/example/other.>forge-ssh</a>" tmp &&
+	grep "href=.https://github.com/example/other/commit/$sub." tmp
+'
+
+test_expect_success 'a cgit host keeps its .git suffix in the commit link' '
+	sub=$(git -C repos/subparent rev-parse HEAD~1) &&
+	grep "href=.https://git.kernel.org/pub/scm/git/git.git/commit/?id=$sub." tmp
+'
+
+test_expect_success 'an unresolvable url stays unlinked with a tooltip' '
+	grep "class=.ls-mod. title=.git@private.example.com:closed/thing.git.>opaque</span>" tmp
+'
+
+test_expect_success 'the links stay off without the flag' '
+	sed "/enable-gitmodules-links/d" subrc >subrcoff &&
+	CGIT_CONFIG="$PWD/subrcoff" QUERY_STRING="url=subparent/tree/" cgit >tmp &&
+	! grep "subtarget/tree" tmp &&
+	grep "class=.ls-mod.>local-ssh</span>" tmp
+'
+
+test_done