CentOS: Replace obsolete CentOS repos with CentOS Vault mirrored in Japan

centos-vault-repos.bash

##
## CentOS: Replace obsolete CentOS repos with CentOS Vault mirrored in Japan
## Copyright (c) 2022 SATOH Fumiyasu @ OSSTech Corp., Japan
##
## License: GNU General Public License version 3
##

set -u
set -e
umask 0022

latest_baseurl="\
http://ftp.iij.ad.jp/pub/linux/centos-vault/\$contentdir/\$releasever/\\2/\$basearch/\\3/,\
http://ftp.jaist.ac.jp/pub/Linux/CentOS-vault/\$contentdir/\$releasever/\\2/\$basearch/\\3/\
"

mkdir -p /etc/yum.repos.d/dist

for repo in /etc/yum.repos.d/CentOS-*.repo; do
  repo_dist="/etc/yum.repos.d/dist/$(basename $repo)"

  if [[ ! -f $repo ]]; then
    continue
  fi
  if [[ ! -f $repo_dist ]]; then
    cp -a "$repo" "$repo_dist"
  fi

  sed \
    -e 's/^\[\(.*\)\]/[\L\1]/' \
    -e 's!^mirrorlist=!#&!' \
    -e "s!^#* *\(baseurl=\).*/\([a-zA-Z]*\)/[^/]*/\([a-z]*\)/\$!\1$latest_baseurl!" \
    <"$repo_dist" \
    >"$repo" \
  ;
done