debugfs: Don't use a pager if stdout is not a tty

If we are redirecting the output of debugfs to a file or to another
process via a pipe, there's no point sending the output to a pager.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/debugfs/util.c b/debugfs/util.c
index a490d2c..0633960 100644 (file)
--- a/debugfs/util.c
+++ b/debugfs/util.c
@@ -82,6 +82,8 @@ FILE *open_pager(void)
        char buf[80];
 
        signal(SIGPIPE, SIG_IGN);
+       if (!isatty(1))
+               return stdout;
        if (!pager)
                pager = getenv("PAGER");
        if (!pager)