se_srpm_version.sh

#!/bin/bash

# This script add git commit info in spec `Release`
# https://fedoraproject.org/wiki/Archive:Tools/RPM/VersionComparison?rd=Tools/RPM/VersionComparison
#
# eg. 
# (1)
#  prev version (tag) 1.5
#  new version still 1.5 but we want to modify the spec
#    * don't change any version (version/ release)
#    * this script would create release like $release_<2>_<hash>
#    * once everything good, bump the release
#
# (2)
#  prev version (tag) 1.5
#  new version 1.6
#    * change version as 1.6
#    * change release with prefix testing$release
#    * this script would create release like $release_<2>_<hash>
#    * once everything good, the release init number as 0

filename=$(basename "$1")
extension="${filename##*.}"
filename="${filename%.*}"
echo $extension

if [[ "$extension" != "spec" ]]; then
   echo "not a spec file"
   exit 1
fi

TAG=$(git describe --tags --dirty --always --abbrev=0)
FULLTAG=$(git describe --tags --dirty --always)

if [[ "$FULLTAG" == "$TAG" ]]; then
   echo "run rpmbuild directly"
   echo $ rpmbuild -bs $1
   exit 0
elif [[ "$FULLTAG" == *"$TAG"* ]]; then
   NUM=${#TAG}
   DIRTY=${FULLTAG:$NUM:12}
   DIRTY=${DIRTY//-/_}
else
   echo "you need commit change first, and don't forget to push code"
   exit 1
fi

sed '1,${/^Release:/s/$/'"$DIRTY"'/}' $1  > /tmp/$filename.spec
rpmbuild -bs /tmp/$filename.spec