#!/bin/bash

set -efu
set -o pipefail

# get current commit (version)
old_commit="$(grep '^%define commit ' glibc.spec | awk '{print $NF}')"
[ -n "$old_commit" ]
# or: rpmspec --define "_sourcedir $PWD" -q --srpm --qf '%{version}' glibc.spec
version="$(grep '^Version:' glibc.spec | awk '{print $NF}')"
[ -n "$version" ]

# get latest available commit (version)
new_commit="$(git ls-remote git://sourceware.org/git/glibc.git release/2.40/master | awk '{print $1}')"
[ -n "$new_commit" ]
if [ "$old_commit" = "$new_commit" ]; then
	echo "There are no updates"
	exit 0
fi

tmp="$(mktemp -d)"
trap 'rm -fr "$tmp"' EXIT

# download the latest version
git clone --depth=1 https://sourceware.org/git/glibc.git -b release/"$version"/master "$tmp"/glibc-"$new_commit"
if [ "$(cd "$tmp"/glibc-"$new_commit" && git rev-parse HEAD)" != "$new_commit" ]; then
	echo "Repository has probably changed in the middle, rerun this script"
	exit 1
fi

# pack it
XZ_OPT="-6 --threads=0 -v" tar cJf glibc-"$new_commit".tar.xz -C "$tmp" glibc-"$new_commit"

# Bump RPM release
# 3.git%{commit_short}.1 -> 4.git%{commit_short}.1
# 3.git%{commit_short}.2 -> 4.git%{commit_short}.1
old_release="$(grep '^Release:' glibc.spec | awk '{print $NF}')"
[ -n "$old_release" ]
IFS=. read -r -a release <<< "$old_release"
# increase first number
num1=$((${release[0]}+1))
# decrease last number to 1
num2=1
new_release="${num1}.${release[1]}.${num2}"
sed -i'' -E glibc.spec \
	-e "s,^%define commit .+,%define commit ${new_commit}," \
	-e "s,^Release:.+,Release:\t${new_release},"
# upload glibc-$new_commit.tar.xz to file-store.rosalinux.ru
abf put -n
sed -i'' .abf.yml -e "/^  glibc-${old_commit}/d"
PAGER= GIT_PAGER= git diff
# copypastable commit message
echo "upd to snapshot $(echo "$new_commit" | head -c5) of v$version"