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[PATCH] branch -l: print useful info whilst rebasing a non-local branch

From
Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
Date
Mar 24, 2018, 18:38 UTC
Message-ID
<20180324183844.4565-1-kaartic.sivaraam@gmail.com>

When rebasing interacitvely (rebase -i), "git branch -l" prints a line indicating the current branch being rebased. This works well when the interactive rebase was intiated when a local branch is checked out.

This doesn't play well when the rebase was initiated on a remote branch or an arbitrary commit that is not pointed to by a local branch. In this case "git branch -l" tries to print the name of a branch using an unintialized variable and thus tries to print a "null pointer string". As a consequence, it does not provide useful information while also inducing undefined behaviour.

So, print the commit from which the rebase started when interactive rebasing a non-local branch.

Signed-off-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
---
 ref-filter.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/ref-filter.c b/ref-filter.c
index f9e25aea7..a4c917c96 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -1310,8 +1310,16 @@ char *get_head_description(void)
 	wt_status_get_state(&state, 1);
 	if (state.rebase_in_progress ||
 	    state.rebase_interactive_in_progress)
+	{
+		const char *rebasing = NULL;
+		if (state.branch != NULL)
+			rebasing = state.branch;
+		else
+			rebasing = state.detached_from;
+
 		strbuf_addf(&desc, _("(no branch, rebasing %s)"),
-			    state.branch);
+			    rebasing);
+	}
 	else if (state.bisect_in_progress)
 		strbuf_addf(&desc, _("(no branch, bisect started on %s)"),
 			    state.branch);
-- 
2.17.0.rc0.231.g781580f06
Next: Eric Sunshine
Message 1 of 27 in “branch -l: print useful info whilst rebasing a non-local branch”
  1. branch -l: print useful info whilst rebasing a non-local branchKaartic Sivaraam, Mar 24, 2018
  2. Eric SunshineMar 25, 2018
  3. Kaartic SivaraamMar 25, 2018
  4. Jeff KingMar 25, 2018
  5. Eric SunshineMar 25, 2018
  6. Eric SunshineMar 25, 2018
  7. Jeff KingMar 25, 2018
  8. Kaartic SivaraamMar 25, 2018
  9. Jacob KellerMar 25, 2018
  10. Jeff KingMar 26, 2018
  11. 1/5 t3200: unset core.logallrefupdates when testing reflog creationJeff King, Mar 26, 2018
  12. 2/5 t: switch "branch -l" to "branch --create-reflog"Jeff King, Mar 26, 2018
  13. 3/5 branch: deprecate "-l" optionJeff King, Mar 26, 2018
  14. 4/5 branch: drop deprecated "-l" optionJeff King, Mar 26, 2018
  15. 5/5 branch: make "-l" a synonym for "--list"Jeff King, Mar 26, 2018
  16. Eric SunshineMar 26, 2018
  17. Jacob KellerMar 26, 2018
  18. Junio C HamanoMar 25, 2018
  19. Eric SunshineMar 25, 2018
  20. Kaartic SivaraamMar 25, 2018
  21. 1/2 branch --list: print useful info whilst interactive rebasing a detached HEADKaartic Sivaraam, Apr 3, 2018
  22. 2/2 t3200: verify "branch --list" sanity when rebasing from detached HEADKaartic Sivaraam, Apr 3, 2018
  23. Eric SunshineApr 3, 2018
  24. Kaartic SivaraamApr 3, 2018
  25. 2/2 t3200: verify "branch --list" sanity when rebasing from detached HEADKaartic Sivaraam, Apr 3, 2018
  26. Eric SunshineApr 4, 2018
  27. 0/2 branch --list: print useful info whilst interactive rebasing a detached HEADKaartic Sivaraam, Apr 3, 2018

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