From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas.monjalon@6wind.com>
Subject: Re: [PATCH] devtools: make commits with stable tag
	outstanding
Date: Fri, 10 Mar 2017 12:13:28 +0100
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To: Yuanhan Liu <yuanhan.liu@linux.intel.com>
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2017-02-23 10:49, Yuanhan Liu:
> So that, as a stable maintainer while picking commits to a stable release,
> I could pay less attention to those have it and pay more attention to those
> don't have it.

Good idea 

> +	stable="-"
> +	git show $id | grep -qi 'Cc: .*stable@dpdk.org' && stable="S"

Instead of git show, it is preferrable to get only the message content:
	git log --format='%b' -1 $id

The regex may miss a Cc: without space, and may match a Cc in the middle
of a sentence.
I suggest this one:
	grep -qi '^Cc: *stable@dpdk.org'

The script is written in the style "set -e" so it must be avoided to have
a "false" statement not catched.
It can be done in 2 ways:

1/
git log --format='%b' -1 $id | grep -qi '^Cc: *stable@dpdk.org' && stable='S' || stable='-'

2/
if git log --format='%b' -1 $id | grep -qi '^Cc: *stable@dpdk.org' ; then
	stable='S'
else
	stable='-'
endif

We can also move it in a function in order to keep only the logic in the
"main" block:
	stable=$(stable_tag $id)

# print a marker for stable tag presence
stable_tag () # <hash>
{
	if git log --format='%b' -1 $id | grep -qi '^Cc: *stable@dpdk.org' ; then
		echo 'S'
	else
		echo '-'
	endif
}