[PATCH 2/4] update-hook: show the contents of the tag message for annotated tags

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The annotated tag points at a commit, for which we show the short log.
However, the tag itself contains a message, possibly release notes or
hand-written change log - whatever it contains is worth showing.  The
tag message is extracted with

  git cat-file tag $newrev | tail -q -n +5

Which is dangerously reliant on the format of the tag object being four
header lines then the message.  I don't like it, but I don't know of any
other way of extracting the message.  It's also missing any kind of
support for the GPG signature.

Signed-off-by: Andy Parkins <andyparkins@xxxxxxxxx>
---
 templates/hooks--update |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/templates/hooks--update b/templates/hooks--update
index 1a60773..31e72ca 100644
--- a/templates/hooks--update
+++ b/templates/hooks--update
@@ -231,8 +231,14 @@ case "$refname_type" in
 
 		echo ""
 		echo $LOGBEGIN
-		echo ""
 
+		# Show the content of the tag message; this might contain a change log
+		# or release notes so is worth displaying.  "tail -n +5" is there to
+		# remove the first 4 lines of the tag object, those details have
+		# already been summarised above
+		git cat-file tag $newrev | tail -q -n +5
+
+		echo ""
 		if [ -n "$prevtag" ]; then
 			git rev-list --pretty=short "$prevtag..$newrev" | git shortlog
 		else
-- 
1.5.0.3.402.g0c48


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