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[PATCH 06/18] revert: Propogate errors upwards from do_pick_commit

From
Ramkumar Ramachandra <artagnon@gmail.com>
Date
Jul 19, 2011, 17:17 UTC
Message-ID
<1311095876-3098-7-git-send-email-artagnon@gmail.com>
In-Reply-To
<1311095876-3098-1-git-send-email-artagnon@gmail.com>

Currently, revert_or_cherry_pick can fail in two ways. If it encounters a conflict, it returns a positive number indicating the intended exit status for the git wrapper to pass on; for all other errors, it calls die(). The latter behavior is inconsiderate towards callers, as it denies them the opportunity to recover from errors and do other things.

After this patch, revert_or_cherry_pick will still return a positive return value to indicate an exit status for conflicts as before, while for some other errors, it will print an error message and return -1 instead of die()-ing. The cmd_revert and cmd_cherry_pick are adjusted to handle the fatal errors by die()-ing themselves.

While the full benefits of this patch will only be seen once all the "die" calls are replaced with calls to "error", its immediate impact is to change some "fatal:" messages to say "error:" and to add a new "fatal: cherry-pick failed" message at the end when the operation fails.

Inspired-by: Christian Couder <chriscool@tuxfamily.org>
Mentored-by: Jonathan Nieder <jrnieder@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
---
 builtin/revert.c |   67 ++++++++++++++++++++++++++++-------------------------
 1 files changed, 35 insertions(+), 32 deletions(-)
diff --git a/builtin/revert.c b/builtin/revert.c
index 794c050..5dbea40 100644
--- a/builtin/revert.c
+++ b/builtin/revert.c
@@ -241,25 +241,20 @@ static struct tree *empty_tree(void)
 	return tree;
 }
 
-static NORETURN void die_dirty_index(const char *me)
+static int error_dirty_index(const char *me)
 {
-	if (read_cache_unmerged()) {
-		die_resolve_conflict(me);
-	} else {
-		if (advice_commit_before_merge) {
-			if (action == REVERT)
-				die(_("Your local changes would be overwritten by revert.\n"
-					  "Please, commit your changes or stash them to proceed."));
-			else
-				die(_("Your local changes would be overwritten by cherry-pick.\n"
-					  "Please, commit your changes or stash them to proceed."));
-		} else {
-			if (action == REVERT)
-				die(_("Your local changes would be overwritten by revert.\n"));
-			else
-				die(_("Your local changes would be overwritten by cherry-pick.\n"));
-		}
-	}
+	if (read_cache_unmerged())
+		return error_resolve_conflict(me);
+
+	/* Different translation strings for cherry-pick and revert */
+	if (action == CHERRY_PICK)
+		error(_("Your local changes would be overwritten by cherry-pick."));
+	else
+		error(_("Your local changes would be overwritten by revert."));
+
+	if (advice_commit_before_merge)
+		advise(_("Please, commit your changes or stash them to proceed."));
+	return -1;
 }
 
 static int fast_forward_to(const unsigned char *to, const unsigned char *from)
@@ -376,9 +371,9 @@ static int do_pick_commit(void)
 			die (_("Your index file is unmerged."));
 	} else {
 		if (get_sha1("HEAD", head))
-			die (_("You do not have a valid HEAD"));
+			return error(_("You do not have a valid HEAD"));
 		if (index_differs_from("HEAD", 0))
-			die_dirty_index(me);
+			return error_dirty_index(me);
 	}
 	discard_cache();
 
@@ -391,20 +386,20 @@ static int do_pick_commit(void)
 		struct commit_list *p;
 
 		if (!mainline)
-			die(_("Commit %s is a merge but no -m option was given."),
-			    sha1_to_hex(commit->object.sha1));
+			return error(_("Commit %s is a merge but no -m option was given."),
+				sha1_to_hex(commit->object.sha1));
 
 		for (cnt = 1, p = commit->parents;
 		     cnt != mainline && p;
 		     cnt++)
 			p = p->next;
 		if (cnt != mainline || !p)
-			die(_("Commit %s does not have parent %d"),
-			    sha1_to_hex(commit->object.sha1), mainline);
+			return error(_("Commit %s does not have parent %d"),
+				sha1_to_hex(commit->object.sha1), mainline);
 		parent = p->item;
 	} else if (0 < mainline)
-		die(_("Mainline was specified but commit %s is not a merge."),
-		    sha1_to_hex(commit->object.sha1));
+		return error(_("Mainline was specified but commit %s is not a merge."),
+			sha1_to_hex(commit->object.sha1));
 	else
 		parent = commit->parents->item;
 
@@ -414,12 +409,12 @@ static int do_pick_commit(void)
 	if (parent && parse_commit(parent) < 0)
 		/* TRANSLATORS: The first %s will be "revert" or
 		   "cherry-pick", the second %s a SHA1 */
-		die(_("%s: cannot parse parent commit %s"),
-		    me, sha1_to_hex(parent->object.sha1));
+		return error(_("%s: cannot parse parent commit %s"),
+			me, sha1_to_hex(parent->object.sha1));
 
 	if (get_message(commit->buffer, &msg) != 0)
-		die(_("Cannot get commit message for %s"),
-				sha1_to_hex(commit->object.sha1));
+		return error(_("Cannot get commit message for %s"),
+			sha1_to_hex(commit->object.sha1));
 
 	/*
 	 * "commit" is an existing commit.  We would want to apply
@@ -580,14 +575,22 @@ static int revert_or_cherry_pick(int argc, const char **argv)
 
 int cmd_revert(int argc, const char **argv, const char *prefix)
 {
+	int res;
 	if (isatty(0))
 		edit = 1;
 	action = REVERT;
-	return revert_or_cherry_pick(argc, argv);
+	res = revert_or_cherry_pick(argc, argv);
+	if (res < 0)
+		die(_("revert failed"));
+	return res;
 }
 
 int cmd_cherry_pick(int argc, const char **argv, const char *prefix)
 {
+	int res;
 	action = CHERRY_PICK;
-	return revert_or_cherry_pick(argc, argv);
+	res = revert_or_cherry_pick(argc, argv);
+	if (res < 0)
+		die(_("cherry-pick failed"));
+	return res;
 }

-- 
1.7.4.rc1.7.g2cf08.dirty
Previous: Ramkumar RamachandraNext: Ramkumar Ramachandra
Message 17 of 34 in “[GSoC update] Sequencer for inclusion v2”
  1. Ramkumar RamachandraJul 19, 2011
  2. 01/18 advice: Introduce error_resolve_conflictRamkumar Ramachandra, Jul 19, 2011
  3. Phil HordJul 21, 2011
  4. Jeff KingJul 22, 2011
  5. Ramkumar RamachandraJul 24, 2011
  6. Junio C HamanoJul 24, 2011
  7. Phil HordJul 25, 2011
  8. 02/18 config: Introduce functions to write non-standard fileRamkumar Ramachandra, Jul 19, 2011
  9. Jeff KingJul 19, 2011
  10. Jonathan NiederJul 19, 2011
  11. Junio C HamanoJul 19, 2011
  12. Jeff KingJul 19, 2011
  13. Ramkumar RamachandraJul 24, 2011
  14. 03/18 revert: Simplify and inline add_message_to_msgRamkumar Ramachandra, Jul 19, 2011
  15. 04/18 revert: Don't check lone argument in get_encodingRamkumar Ramachandra, Jul 19, 2011
  16. 05/18 revert: Rename no_replay to record_originRamkumar Ramachandra, Jul 19, 2011
  17. 06/18 revert: Propogate errors upwards from do_pick_commitRamkumar Ramachandra, Jul 19, 2011
  18. 07/18 revert: Eliminate global "commit" variableRamkumar Ramachandra, Jul 19, 2011
  19. 08/18 revert: Introduce struct to keep command-line optionsRamkumar Ramachandra, Jul 19, 2011
  20. 09/18 revert: Separate cmdline parsing from functional codeRamkumar Ramachandra, Jul 19, 2011
  21. 10/18 revert: Don't create invalid replay_opts in parse_argsRamkumar Ramachandra, Jul 19, 2011
  22. 11/18 revert: Save data for continuing after conflict resolutionRamkumar Ramachandra, Jul 19, 2011
  23. 12/18 revert: Save command-line options for continuing operationRamkumar Ramachandra, Jul 19, 2011
  24. 13/18 revert: Make pick_commits functionally act on a commit listRamkumar Ramachandra, Jul 19, 2011
  25. 14/18 revert: Introduce --reset to remove sequencer stateRamkumar Ramachandra, Jul 19, 2011
  26. 15/18 reset: Make reset remove the sequencer stateRamkumar Ramachandra, Jul 19, 2011
  27. 16/18 revert: Remove sequencer state when no commits are pendingRamkumar Ramachandra, Jul 19, 2011
  28. 17/18 revert: Don't implictly stomp pending sequencer operationRamkumar Ramachandra, Jul 19, 2011
  29. 18/18 revert: Introduce --continue to continue the operationRamkumar Ramachandra, Jul 19, 2011
  30. Junio C HamanoJul 19, 2011
  31. Ramkumar RamachandraJul 20, 2011
  32. Junio C HamanoJul 19, 2011
  33. Ramkumar RamachandraJul 24, 2011
  34. Junio C HamanoJul 24, 2011

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