[ptxdist] [PATCH v1] ptxdist: print a note when calling ptxdist inside 'ptxdist bash'

[Roland Hieber <rhi@pengutronix.de>]

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>
---
RFC -> PATCH v1:
 - bailout instead of printing a notice (Michael Olbrich)
 - check for PTXDIST_TOPDIR directly in main because it will already be
   defined in ptxdist_trap_exit_handler (and also I don't know anymore
   what significance ptxdist_trap_exit_handler holds that I used it
   previously…)

RFC was at https://lore.ptxdist.org/ptxdist/20210114225149.3181-1-rhi@pengutronix.de
---
 bin/ptxdist | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/bin/ptxdist b/bin/ptxdist
index 13f81674f4fd..c41065311f0c 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 &&
 
-- 
2.29.2


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