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-rw-r--r--builtin/submodule--helper.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index 2c2395a..12d546d 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -19,6 +19,7 @@
#include "diffcore.h"
#include "diff.h"
#include "object-store.h"
+#include "advice.h"
#define OPT_QUIET (1 << 0)
#define OPT_CACHED (1 << 1)
@@ -1268,6 +1269,13 @@ struct submodule_alternate_setup {
#define SUBMODULE_ALTERNATE_SETUP_INIT { NULL, \
SUBMODULE_ALTERNATE_ERROR_IGNORE, NULL }
+static const char alternate_error_advice[] = N_(
+"An alternate computed from a superproject's alternate is invalid.\n"
+"To allow Git to clone without an alternate in such a case, set\n"
+"submodule.alternateErrorStrategy to 'info' or, equivalently, clone with\n"
+"'--reference-if-able' instead of '--reference'."
+);
+
static int add_possible_reference_from_superproject(
struct object_directory *odb, void *sas_cb)
{
@@ -1299,6 +1307,8 @@ static int add_possible_reference_from_superproject(
} else {
switch (sas->error_mode) {
case SUBMODULE_ALTERNATE_ERROR_DIE:
+ if (advice_submodule_alternate_error_strategy_die)
+ advise(_(alternate_error_advice));
die(_("submodule '%s' cannot add alternate: %s"),
sas->submodule_name, err.buf);
case SUBMODULE_ALTERNATE_ERROR_INFO: