#! /bin/bash
#
# For testing commits on a branch.
#
# The script loops through all commits in a branch (or between two given commits),
# checks out each, builds INET, and launches a script that runs some simulations.
# If the script exits with nonzero exit code, the commit is tagged in the git repo,
# so commits that break things can be viewed with 'gitk'.
#

if [ $# -eq 0 ]
  then
    echo "Usage: test-branch <start> <end>"
    exit
fi

# range of commits to test; edit to your needs
STARTREV=$1
ENDREV=$2

# build and fingerprint threads
THREADS=7

# the command to run on each commit
COMMAND="./fingerprints -t $THREADS"

# the label (actually, branch) names added to commits where command output changes
LABEL=error
BLABEL=build-error

INET_ROOT=../..

# get the list of commits
commits=`git rev-list --reverse $STARTREV..$ENDREV || exit 1`

# make clean
(cd $INET_ROOT && make cleanall)

rm .buildlog-*
rm *.csv.UPDATED
rm *.csv.diff-*

#clean old branches
i=0
for commit in $commits; do
    (( i += 1 ))
    git branch -d "$LABEL-$i" 2>/dev/null
    git branch -d "$BLABEL-$i" 2>/dev/null
done

i=0
for commit in $commits; do
    (( i += 1 ))

    echo
    echo ---------------------------------------------------
    echo -n $i ": "
    git log -n 1 --pretty=oneline $commit | cat || exit 1
    git checkout -q $commit || exit 1

    echo "Building..."
    (cd $INET_ROOT && make -f makemakefiles)
    if (cd $INET_ROOT && make -j$THREADS) > .buildlog 2>&1; then
        : # build OK
    else
        echo "BUILD ERROR! Tagging with '$BLABEL-$i'"
        git branch -f "$BLABEL-$i"
        cp .buildlog ".buildlog-$i"
        continue
    fi

    echo "Running test script..."


    if $COMMAND > "fp_out-$i.out"; then
        rm "fp_out-$i.out"
        echo "OK"
    else
        echo "ERROR! Tagging with '$LABEL-$i'"
        git branch -f "$LABEL-$i"
        diff -u examples.csv examples.csv.UPDATED >"examples.csv.diff-$i"
        diff -u manet.csv manet.csv.UPDATED >"manet.csv.diff-$i"
        rm *.csv.UPDATED
    fi
done