Add tests for plugins setting file content to None

t/file_data_filter-removefiles.expected

@@ -0,0 +1,27 @@
+blob
+mark :1
+data 7
+good_a
+
+reset refs/heads/master
+commit refs/heads/master
+mark :2
+author Grevious Bodily Harmsworth <gbh@example.com> 1679014800 +0000
+committer Grevious Bodily Harmsworth <gbh@example.com> 1679014800 +0000
+data 2
+r0M 100644 :1 good_a.txt
+
+commit refs/heads/master
+mark :3
+author Grevious Bodily Harmsworth <gbh@example.com> 1679018400 +0000
+committer Grevious Bodily Harmsworth <gbh@example.com> 1679018400 +0000
+data 2
+r1from :2
+
+commit refs/heads/master
+mark :4
+author Grevious Bodily Harmsworth <gbh@example.com> 1679022000 +0000
+committer Grevious Bodily Harmsworth <gbh@example.com> 1679022000 +0000
+data 2
+r2from :3
+

t/file_data_filter-removefiles.t

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+#!/bin/bash
+#
+# Copyright (c) 2023 Felipe Contreras
+# Copyright (c) 2023 Frej Drejhammar
+# Copyright (c) 2024 Stephan Hohe
+#
+# Check that files that file_data_filter sets to None are removed from repository
+#
+
+test_description='Remove files from file_data_filter plugin test'
+
+. "${SHARNESS_TEST_SRCDIR-$(dirname "$0")/sharness}"/sharness.sh || exit 1
+
+check() {
+	echo "$3" > expected &&
+	git -C "$1" show -q --format='%s' "$2" > actual &&
+	test_cmp expected actual
+}
+
+git_create() {
+	git init -q "$1"
+}
+
+git_convert() {
+	(
+	cd "$2" &&
+	hg-fast-export.sh --repo "../$1" \
+			  -s --hgtags -n \
+			  --plugin ../../plugins/removefiles_test_plugin
+	)
+}
+
+setup() {
+	cat > "$HOME"/.hgrc <<-EOF
+	[ui]
+	username = Grevious Bodily Harmsworth <gbh@example.com>
+	EOF
+}
+
+commit0() {
+	(
+	# Test inital revision with suppressed file
+	cd hgrepo &&
+	echo "good_a" > good_a.txt &&
+	echo "bad_a" > bad_a.txt &&
+	hg add good_a.txt bad_a.txt &&
+	hg commit -d "2023-03-17 01:00Z" -m "r0"
+	)
+}
+
+commit1() {
+	(
+	# Test modifying suppressed file
+	# Test adding suppressed file
+	cd hgrepo &&
+	echo "bad_a_modif" > bad_a.txt &&
+	echo "bad_b" > bad_b.txt &&
+	hg add bad_b.txt &&
+	hg commit -d "2023-03-17 02:00Z" -m "r1"
+	)
+}
+
+commit2() {
+	(
+	# Test removing suppressed file
+	cd hgrepo &&
+	hg rm bad_a.txt &&
+	hg commit -d "2023-03-17 03:00Z" -m "r2"
+	)
+}
+
+setup
+
+test_expect_success 'all in one' '
+	test_when_finished "rm -rf hgrepo gitrepo" &&
+
+	(
+	hg init hgrepo &&
+	commit0 &&
+	commit1 &&
+	commit2
+	) &&
+	git_create gitrepo &&
+	git_convert hgrepo gitrepo &&
+	git -C gitrepo fast-export --all > actual &&
+
+ 	test_cmp "$SHARNESS_TEST_DIRECTORY"/file_data_filter-removefiles.expected actual
+'
+
+test_done

t/plugins/removefiles_test_plugin/__init__.py

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+import subprocess
+import shlex
+import sys
+from mercurial import node
+
+def build_filter(args):
+    return Filter(args)
+
+class Filter:
+    def __init__(self, args):
+        self.filter_contents = shlex.split(args)
+
+    def file_data_filter(self,file_data):
+        if file_data['filename'].startswith(b'bad'):
+            file_data['data'] = None