From: Hilko Bengen <bengen@debian.org>
Date: Sun, 10 Jan 2021 00:24:53 +0100
Subject: output: Replace system() with explicit bash invocation

Tehre is probably a better way to do this.
---
 filters/log/output.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/filters/log/output.c b/filters/log/output.c
index 4a11604..e769dc5 100644
--- a/filters/log/output.c
+++ b/filters/log/output.c
@@ -44,6 +44,7 @@
 #include <assert.h>
 #include <fcntl.h>
 #include <unistd.h>
+#include <sys/wait.h>
 
 #include <nbdkit-filter.h>
 
@@ -113,6 +114,8 @@ to_script (struct handle *h, log_id_t id, const char *act, enum type type,
   CLEANUP_FREE char *str = NULL;
   size_t len = 0;
   int r;
+  int pid;
+  int wstatus = 0;
 
   /* Create the shell variables + script. */
   fp = open_memstream (&str, &len);
@@ -140,7 +143,14 @@ to_script (struct handle *h, log_id_t id, const char *act, enum type type,
   fclose (fp);
 
   /* Run the script.  Log the status, but ignore it. */
-  r = system (str);
+  if (pid = fork() == 0) {
+    execl ("/bin/bash", "sh", "-c", str, NULL);
+    exit (-errno);
+  } else if (pid > 0) {
+    waitpid (pid, &r, 0);
+  } else {
+    r = -1;
+  }
   exit_status_to_nbd_error (r, "logscript");
 }