repack: test --full-name-hash option

The new '--full-name-hash' option for 'git repack' is a simple
pass-through to the underlying 'git pack-objects' subcommand. However,
this subcommand may have other options and a temporary filename as part
of the subcommand execution that may not be predictable or could change
over time.

The existing test_subcommand method requires an exact list of arguments
for the subcommand. This is too rigid for our needs here, so create a
new method, test_subcommand_flex. Use it to check that the
--full-name-hash option is passing through.

Signed-off-by: Derrick Stolee <stolee@gmail.com>

t/t7700-repack.sh

@@ -782,6 +782,13 @@ test_expect_success 'repack -ad cleans up old .tmp-* packs' '
 	test_must_be_empty tmpfiles
 '
 
+test_expect_success '--full-name-hash option passes through to pack-objects' '
+	GIT_TRACE2_EVENT="$(pwd)/full-trace.txt" \
+		git repack -a --full-name-hash &&
+	test_subcommand_flex git pack-objects --full-name-hash <full-trace.txt
+'
+
+
 test_expect_success 'setup for update-server-info' '
 	git init update-server-info &&
 	test_commit -C update-server-info message

t/test-lib-functions.sh

@@ -1885,6 +1885,33 @@ test_subcommand () {
 	fi
 }
 
+
+# Check that the given subcommand was run with the given set of
+# arguments in order (but with possible extra arguments).
+#
+#	test_subcommand_flex [!] <command> <args>... < <trace>
+#
+# If the first parameter passed is !, this instead checks that
+# the given command was not called.
+#
+test_subcommand_flex () {
+	local negate=
+	if test "$1" = "!"
+	then
+		negate=t
+		shift
+	fi
+
+	local expr="$(printf '"%s",.*' "$@")"
+
+	if test -n "$negate"
+	then
+		! grep "\[$expr\]"
+	else
+		grep "\[$expr\]"
+	fi
+}
+
 # Check that the given command was invoked as part of the
 # trace2-format trace on stdin.
 #