File update.sh of Package arcanist

#!/bin/bash

if [ ! -d "arcanist.git" ]; then
    git clone -b stable https://github.com/phacility/arcanist.git arcanist.git
    pushd arcanist.git
else
    pushd arcanist.git
    git remote set-url origin https://github.com/phacility/arcanist.git
    git fetch origin
    git reset --hard origin/stable
    git clean -d -f -x
fi

git_short_version_hash=$(git rev-parse --short HEAD)
git_full_version_hash=$(git rev-parse HEAD)

commitepoch=$(git log HEAD^1..HEAD --oneline --format=%ct | head -n 1)
commitdate=$(date +%Y%m%d --date @${commitepoch})
month_behind=$(date +%Y%m%d --date @$(( ${commitepoch} - ( 31 * 24 * 3600 ) )))
month_ahead=$(date +%Y%m%d --date @$(( ${commitepoch} + ( 31 * 24 * 3600 ) )))

popd

if [ ! -d arcanist-${git_full_version_hash}.tar.gz ]; then
    rm -rf arcanist-*.tar.gz
    wget --content-disposition https://github.com/phacility/arcanist/archive/${git_full_version_hash}.tar.gz#/arcanist-${git_full_version_hash}.tar.gz
fi

sed -i -r \
    -e "s/git_short_version_hash .*/git_short_version_hash ${git_short_version_hash}/g" \
    -e "s/git_full_version_hash .*/git_full_version_hash ${git_full_version_hash}/g" \
    -e "s/Version:(\s+)[0-9]+/Version:\1${commitdate}/g" \
    -e "s/Requires:(\s+)arcanist$libphutil$ >= [0-9]+/Requires:\1arcanist$libphutil$ >= ${month_behind}/g" \
    -e "s/Requires:(\s+)arcanist$libphutil$ <= [0-9]+/Requires:\1arcanist$libphutil$ <= ${month_ahead}/g" \
    arcanist.spec

rpmdev-bumpspec \
    --new="${commitdate}.git${git_short_version_hash}" \
    --comment "Promote Week #$(date +%V --date ${commitdate})" \
    arcanist.spec

rm -rf *.src.rpm
osc ar

osc build --no-verify CentOS_7 arcanist.spec && \
    rm -rf review-arcanist/ arcanist-*.src.rpm && \
    cp /var/tmp/build-root/CentOS_7-x86_64/home/abuild/rpmbuild/SRPMS/arcanist-*.src.rpm . && \
    fedora-review --verbose -n arcanist