File:Kernel patches stats.png

#!/bin/sh

# Whose patches to count
PAT='@openvz.org|@parallels.com|@sw.ru|@swsoft.com|@sw.com.sg|adobriyan@|kuznet@'

# Return the date of the given tag, in a format usable by gnuplot
get_tag_date() {
	echo $(git show $1 | egrep ^Date: | head -n1) | 
		sed 's/^Date: ... \(.*\) [-+]....$/\1/' |
		sed 's/ ..:..:..//' | sed 's/ /-/g'
}

# Count the number of patches whose authors match $PAT,
# for the period between two given git tags
count_patches() {
	git log --pretty=short --no-merges $1..$2 |
		egrep '^Author: ' | egrep $PAT | wc -l
}

# What is the latest kernel patch number (i.e. x in 2.6.x)
latest=$(git tag | grep -v -- -rc | tail -n1 | sed -e 's/^.*\.\(.*\)$/\1/')

# Find out if number of patches for HEAD is much more
# than for latest -rc. If yes, use HEAD, otherwise -rc.
last_rc=$(git tag | tail -n 1 | grep -- -rc)
HEAD=$last_rc
if ! test -z "$last_rc"; then
	much_more=15
	count_head=$(count_patches v2.6.$latest HEAD)
	count_rc=$(count_patches v2.6.$latest $last_rc)
	if test $count_head -gt $((count_rc+much_more)); then
		HEAD="HEAD   "
	fi
fi

# We start from 2.6.12 -- the first kernel available in git
for f in $(seq 13 $((latest+1))); do
	v1=v2.6.$((f-1))
	d1=$(get_tag_date $v1)
	if [ $f -gt $latest ]; then
		v2=$HEAD
	else
		v2=v2.6.$f
	fi
	d2=$(get_tag_date $v2)
	count=$(count_patches $v1 $v2)
	if test "$count" -gt 0; then
		echo $d2 $v2 " " $count
	fi

done | sed 's/ /\t/g'

#!/bin/sh

if test "$1" != "-f"; then
	git checkout master
	git pull
	sh count > time.dat
fi

DATE=$(tail -n 1 time.dat | cut -f 1 | awk -F- '{print $2,$1,$3}')
MAXY=$(awk 'BEGIN {max=0}; ($3 > max) {max=$3}; END {print max+50}' < time.dat)
# GNU date is powerful!
MAXX=$(date +%b-1-%Y --date='+2 months')

export GDFONTPATH=/usr/share/fonts/msttcorefonts/
cat << EOF | gnuplot > plot.png
set terminal png enhanced font "verdanab,20" size 1600,1200
#set terminal png enhanced transparent font "verdanab,14" size 1200,600
#set terminal svg enhanced font "verdanab,8" size 800,600

set title "OpenVZ team kernel patches progress as of ${DATE}"

unset xlabel
set xdata time
set timefmt "%b-%d-%Y"
set format x "%b\n%Y"
set grid xtics mxtics noytics

set xrange [ : "${MAXX}" ]
set yrange [ 0 : ${MAXY} ]
set ylabel "Number of patches from OpenVZ team,\n per kernel release, accepted into mainstream"

set border 3		# no lines at right and top
set xtics nomirror	# no tics at top
set ytics nomirror	# no tics at right

plot 'time.dat' using 1:3 with linespoints pt 6 ps 1 lw 2 lt 2 notitle, \
	''	using 1:3:2 with labels left offset 0,1 rotate notitle, \
	''	using 1:3:3 with labels left offset 0.7,0 notitle

EOF