mimic_merges

#!/bin/bash
#emacs: -*- mode: shell-script; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*- 
#ex: set sts=4 ts=4 sw=4 noet:
#
#
# COPYRIGHT: Yaroslav Halchenko 2014
#
# LICENSE: MIT
#
#  Permission is hereby granted, free of charge, to any person obtaining a copy
#  of this software and associated documentation files (the "Software"), to deal
#  in the Software without restriction, including without limitation the rights
#  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#  copies of the Software, and to permit persons to whom the Software is
#  furnished to do so, subject to the following conditions:
#
#  The above copyright notice and this permission notice shall be included in
#  all copies or substantial portions of the Software.
#
#  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
#  THE SOFTWARE.
#

set -eu

depth=5
# precreate associative array with directory names
declare -A dirs
dirs["0"]='.'
dname=.
for d in `eval echo {1..$depth}`; do
	echo $dname
	dname+="/d$d"
	dirs["$d"]=$dname
done

function multi_branch {
	branches=$1
	files_per_branch=$2
    annex=$3
	echo "Creating $branches branches with $files_per_branch per branch. annex=$annex"
	i=0
	for b in `eval echo {1..$branches}`; do
		git co -b b$b master &> /dev/null
		for f in `eval echo {1..$files_per_branch}`; do
			#echo -ne "\rFile $f"
			fdepth=$(python -c "print $i%$depth")
			dname=${dirs["$fdepth"]}
			#[ -e $dname ] || mkdir -p $dname
			fname=$dname/f$i.dat
			echo "file $i" > $fname;
			i=$(($i+1))
		done
        if [ $annex=1 ]; then
            git annex add * > /dev/null;
        else
            git add * > /dev/null
        fi
		git commit -m "commit in branch $b" >/dev/null;
	done
	echo "Merging"
	eval "git merge -m 'merging $branches together' b{1..$branches}" >/dev/null
}

function init_repo {
	tdir_=$1
	if [ -e $tdir_ ]; then
		chmod +w -R $tdir_
		rm -r $tdir_ || :
	fi
	mkdir -p $tdir_
	cd $tdir_
	git init
	git annex init
	touch .empty
	git add .empty; git commit -m "initial commit just to avoid dances with empty branches"
	# precreate directories
	for d in ${dirs[*]}; do
		mkdir -p $tdir_/$d
	done
}

if [ $# -lt 2 ]; then
	echo "Usage: $0  nfiles_per_branch nbranches [tempdir]"
	exit 1
fi

filespb=$1
br=$2
files=$(python -c "print $filespb*$br")

if [ $# -ge 3 ]; then
	tdir=$3
else
	tdir=/tmp/testdir
fi

annex=0
echo "Temp path $tdir"
init_repo $tdir/branches;   cd $tdir/branches; time multi_branch $br $filespb $annex
init_repo $tdir/nobranches; cd $tdir/nobranches; time multi_branch 1 $files $annex

#init_repo
#time singe_branch