perf tools: Fix pager on minimal-install embedded systems

Some Distributions may lack "less" package being included by default,
e.g., Linaro nano rootfs. In those cases use the portable "pager"
command instead of "less".

Signed-off-by: Avik Sil <avik.sil@linaro.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338287725-26382-1-git-send-email-avik.sil@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/pager.c b/tools/perf/util/pager.c
index 1915de2..3322b84 100644 (file)
--- a/tools/perf/util/pager.c
+++ b/tools/perf/util/pager.c
@@ -57,6 +57,10 @@ void setup_pager(void)
        }
        if (!pager)
                pager = getenv("PAGER");
+       if (!pager) {
+               if (!access("/usr/bin/pager", X_OK))
+                       pager = "/usr/bin/pager";
+       }
        if (!pager)
                pager = "less";
        else if (!*pager || !strcmp(pager, "cat"))