Change in pysim[master]: pySim-shell: prevent inconsitancy when walking through the FS tree

[dexter]

dexter has uploaded this change for review. ( https://gerrit.osmocom.org/c/pysim/+/23567 )


Change subject: pySim-shell: prevent inconsitancy when walking through the FS tree
......................................................................

pySim-shell: prevent inconsitancy when walking through the FS tree

When using the method walk() to walk through the filesystem tree, then
the action() callback must not change the currently selected file.
Unfortunately this can easily happen and result in unpredictable
behavior. Lets add a check + an exeception for this to make debugging
easier.

Change-Id: I6778faa87bdf5552da74659206bf7a6fc0348d0c
Related: OS#4963
---
M pySim-shell.py
1 file changed, 7 insertions(+), 0 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/pysim refs/changes/67/23567/1

diff --git a/pySim-shell.py b/pySim-shell.py
index 11953eb..2ac0b26 100755
--- a/pySim-shell.py
+++ b/pySim-shell.py
@@ -263,7 +263,14 @@
 				self.walk(indent + 1, action, context)
 				fcp_dec = self._cmd.rs.select("..", self._cmd)
 			elif action:
+				df_before_action = self._cmd.rs.selected_file
 				action(f, context)
+				# When walking through the file system tree the action must not
+				# always restore the currently selected file to the file that
+				# was selected before executing the action() callback.
+				if df_before_action != self._cmd.rs.selected_file:
+					raise RuntimeError("inconsistant walk, %s is currently selected but expecting %s to be selected"
+							   % (str(self._cmd.rs.selected_file), str(df_before_action)))
 
 	def do_tree(self, opts):
 		"""Display a filesystem-tree with all selectable files"""

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Gerrit-Project: pysim
Gerrit-Branch: master
Gerrit-Change-Id: I6778faa87bdf5552da74659206bf7a6fc0348d0c
Gerrit-Change-Number: 23567
Gerrit-PatchSet: 1
Gerrit-Owner: dexter <pmaier at sysmocom.de>
Gerrit-MessageType: newchange
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