basebackup_to_shell: Add some const qualifiers for consistency

diff --git a/contrib/basebackup_to_shell/basebackup_to_shell.c b/contrib/basebackup_to_shell/basebackup_to_shell.c
index e2b18631e053b97a67f3339c4408bc2e830536c9..bdaf67a4c8561ca39febf4c12aadc189ca801f53 100644 (file)
--- a/contrib/basebackup_to_shell/basebackup_to_shell.c
+++ b/contrib/basebackup_to_shell/basebackup_to_shell.c
@@ -205,11 +205,11 @@ shell_get_sink(bbsink *next_sink, void *detail_arg)
  * making substitutions as appropriate for escape sequences.
  */
 static char *
-shell_construct_command(char *base_command, const char *filename,
-                       char *target_detail)
+shell_construct_command(const char *base_command, const char *filename,
+                       const char *target_detail)
 {
    StringInfoData buf;
-   char       *c;
+   const char *c;
 
    initStringInfo(&buf);
    for (c = base_command; *c != '\0'; ++c)