[PATCHv3 3/7] fast-export: Make sure we show actual ref names instead of "(null)"

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From: Elijah Newren <newren@xxxxxxxxx>

The code expects a ref name to be provided in commit->util.  While there
was some code to set commit->util, it only worked in cases where there was
an unbroken chain of revisions from a ref to the relevant commit.  In
cases such as running
   git fast-export --parents master -- COPYING
commit->util would fail to be set.  The old method of setting commit->util
has been removed in favor of requesting show_source from the revision
traversal machinery (related to the "--source" option of "git log" family
of commands.)

However, this change does not fix cases like
   git fast export master~1
or
   git fast export :/arguments
since in such cases commit->util will be "master~1" or ":/arguments" while
we need the actual ref (e.g. "refs/heads/master")

Signed-off-by: Elijah Newren <newren@xxxxxxxxx>
---
Since the last series, some now-obsolete code has been removed.  Also,
the commit message now points out two cases that continue to fail with
this patch.  For the second of those cases (the :/arguments one), I'm
not sure that I even know what correct behavior would be.

 builtin-fast-export.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)

diff --git a/builtin-fast-export.c b/builtin-fast-export.c
index 8c90a2d..43a7e17 100644
--- a/builtin-fast-export.c
+++ b/builtin-fast-export.c
@@ -530,6 +530,7 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
 
 	init_revisions(&revs, prefix);
 	revs.topo_order = 1;
+	revs.show_source = 1;
 	argc = setup_revisions(argc, argv, &revs, NULL);
 	argc = parse_options(argc, argv, prefix, options, fast_export_usage, 0);
 	if (argc > 1)
@@ -546,11 +547,7 @@ int cmd_fast_export(int argc, const char **argv, const char *prefix)
 	DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
 	while ((commit = get_revision(&revs))) {
 		if (has_unshown_parent(commit)) {
-			struct commit_list *parent = commit->parents;
 			add_object_array(&commit->object, NULL, &commits);
-			for (; parent; parent = parent->next)
-				if (!parent->item->util)
-					parent->item->util = commit->util;
 		}
 		else {
 			handle_commit(commit, &revs);
-- 
1.6.3.2.323.geb889

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