Fallback from `lsb_release` to `/etc/os-release`

[vmcj]

Not all distributions have lsb_release default installed, for all distributions with systemd /etc/os-release seems to be required.

The script dj_make_chroot only uses lsb_release but can be extended to use /etc/os-release. For an example on fedora:

NAME="Fedora Linux"
VERSION="40 (Container Image)"
ID=fedora
VERSION_ID=40
VERSION_CODENAME=""
PLATFORM_ID="platform:f40"
PRETTY_NAME="Fedora Linux 40 (Container Image)"
ANSI_COLOR="0;38;2;60;110;180"
LOGO=fedora-logo-icon
CPE_NAME="cpe:/o:fedoraproject:fedora:40"
DEFAULT_HOSTNAME="fedora"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f40/system-administrators-guide/"
SUPPORT_URL="https://ask.fedoraproject.org/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=40
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=40
SUPPORT_END=2025-05-13
VARIANT="Container Image"
VARIANT_ID=container

For more info see: https://discussion.fedoraproject.org/t/what-is-the-official-way-to-determine-that-the-remote-linux-is-fedora/72482 http://linuxmafia.com/faq/Admin/release-files.html