I ended up rewriting most of the comment. The new version removes
inter-rule dependencies (e.g., rule 5 overrides rule 3) which I think
makes it more readable.
This patch applies on top of the latest patch series regarding
pushing tags. If will include this in a re-roll of that series if
these changes are deemed a good idea.
Also, I hand-edited the patch so that the changes were not interleaved
to make it much easier to read. Can this be done automatically?
Something like a minimum # of matching lines required between
remote.c | 32 +++++++++++++++++---------------
1 file changed, 17 insertions(+), 15 deletions(-)
diff --git a/remote.c b/remote.c
index ee0c1e5..3fb1068 100644
@@ -1319,27 +1319,29 @@ void set_ref_status_for_push(struct ref *remote_refs,
- /* This part determines what can overwrite what.
- * The rules are:
- * (0) you can always use --force or +A:B notation to
- * selectively force individual ref pairs.
- * (1) if the old thing does not exist, it is OK.
- * (2) if the destination is under refs/tags/ you are
- * not allowed to overwrite it; tags are expected
- * to be static once created
- * (3) if you do not have the old thing, you are not allowed
- * to overwrite it; you would not know what you are losing
- * otherwise.
- * (4) if old is a commit and new is a descendant of old
- * (implying new is commit-ish), it is OK.
- * (5) regardless of all of the above, removing :B is
- * always allowed.
+ * The below logic determines whether an individual
+ * refspec A:B can be pushed. The push will succeed
+ * if any of the following are true:
+ * (1) the remote reference B does not exist
+ * (2) the remote reference B is being removed (i.e.
+ * pushing :B where no source is specified)
+ * (3) the update meets all fast-forwarding criteria:
+ * (a) the destination is not under refs/tags/
+ * (b) the old is a commit
+ * (c) the new is a descendant of the old
+ * NOTE: We must actually have the old object in
+ * order to overwrite it in the remote reference,
+ * and that the new object must be commit-ish.
+ * These are implied by (b) and (c) respectively.
+ * (4) it is forced using the +A:B notation, or by
+ * passing the --force argument
ref->not_forwardable = !is_forwardable(ref);
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