prepare-yum-repositories

#!/bin/bash

# This script is used to prepare yum repositories, that are given as arguments.
# It is no-op if user also mounts the repo file(s) into the container during
# image build.  This can be done by one of those commands:
#
#   docker build -v /some/repo/file:/etc/yum.repos.d/sclorg_custom.repo
#   docker build -v /some/repo/directory:/etc/yum.repos.d
#   make CUSTOM_REPO=/some/repo/file/or/directory
#
# The last one works for projects where we have Makefile with the
# container-common-scripts support.

set -ex

# DEFAULT_REPOS and SKIP_REPOS_{ENABLE,DISABLE} are intentionally undocumented,
# but might be used if we need to change this behaviour.
# Once we realize there are real use cases for using those variables, we should
# document them properly.
DEFAULT_REPOS=${DEFAULT_REPOS:-"rhel-7-server-rpms rhel-7-server-optional-rpms"}
SKIP_REPOS_ENABLE=${SKIP_REPOS_ENABLE:-false}
SKIP_REPOS_DISABLE=${SKIP_REPOS_DISABLE:-false}

function is_subscribed() {
  for f in /run/secrets/etc-pki-entitlement/*.pem ; do
    [ -e "$f" ] && return 0
    break
  done
  return 1
}

# DEBUGGING CASE!  Mostly for 'make CUSTOM_REPO=/some/file/or/dir'.
test ! -f /etc/yum.repos.d/sclorg_custom.repo && \
! mountpoint /etc/yum.repos.d \
    || exit 0

# install yum-utils for yum-config-manager
yum install -y yum-utils

if [ "$SKIP_REPOS_DISABLE" = false ] && is_subscribed; then
  # Disable only repos that might come from subscribed host, because there
  # might be other repos provided by user or build system

  disable_repos=
  # Lines look like: "Repo-id  :  dist-tag-override/x86_64"
  while IFS=' /' read -r _ _ repo_id _; do
      case $repo_id in rhel-*)
        disable_repos+=" $repo_id" ;;
      esac
  done <<<"$(yum repolist -v 2>/dev/null | grep Repo-id)"

  if test -n "$disable_repos"; then
    yum-config-manager --disable $disable_repos &> /dev/null
  fi
fi

if [ ${SKIP_REPOS_ENABLE} = false ] && [ -n "${DEFAULT_REPOS}" -o $# -gt 0 ] ; then
  yum-config-manager --enable ${DEFAULT_REPOS} "$@"
fi