From 70247ce7e47963bfbd6c4cdc584f35ca38ccf66d Mon Sep 17 00:00:00 2001
From: Sergio Correia <scorreia@redhat.com>
Date: Mon, 11 Nov 2019 18:06:13 -0500
Subject: [PATCH] Define log callback function to use with libcryptsetup

Logs from libcryptsetup now go to stderr and this prevents issues like
the one reported in https://bugzilla.redhat.com/show_bug.cgi?id=1770395
---
 luksmeta.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/luksmeta.c b/luksmeta.c
index a79da82..1c72787 100644
--- a/luksmeta.c
+++ b/luksmeta.c
@@ -45,6 +45,17 @@ struct options {
     int slot;
 };
 
+#define LUKSMETA_LIBCRYPTSETUP_LOG_LEVEL CRYPT_LOG_ERROR
+
+static void
+luksmeta_libcryptsetup_log(int level, const char *msg, void *usrptr)
+{
+    if (level != LUKSMETA_LIBCRYPTSETUP_LOG_LEVEL) {
+       return;
+    }
+    fprintf(stderr, "%s", msg);
+}
+
 static int
 cmd_test(const struct options *opts, struct crypt_device *cd)
 {
@@ -485,6 +496,8 @@ main(int argc, char *argv[])
             return EX_IOERR;
         }
 
+        crypt_set_log_callback(cd, luksmeta_libcryptsetup_log, NULL);
+
         r = crypt_load(cd, NULL, NULL);
         if (r != 0) {
             fprintf(stderr, "Unable to read LUKSv1 header (%s): %s\n",
-- 
2.23.0