ptxdist: print a note when calling ptxdist inside 'ptxdist bash'

For debugging purposes it might be useful to run ptxdist inside a
'ptxdist bash' session, but under normal conditions this will not work
out of the box. Mention the fact to prevent confusion and useless
debugging sessions:

    $ ptxdist
    FATAL didn't find /scripts/ptxdist_vars.sh
    Note: PTXdist was called inside 'ptxdist bash' – things may be broken.

Signed-off-by: Roland Hieber <rhi@pengutronix.de>
Message-Id: <20210606135350.22150-1-rhi@pengutronix.de>
Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/bin/ptxdist b/bin/ptxdist
index 13f81674f..c41065311 100755
--- a/bin/ptxdist
+++ b/bin/ptxdist
@@ -2641,6 +2641,10 @@ setup_export() {
 ########################################################################
 
 main() {
+	if [ -n "${PTXDIST_TOPDIR}" ]; then
+		ptxd_bailout "Calling PTXdist inside 'ptxdist bash' is not supported."
+	fi
+
 	check_uid &&
 	check_path &&