linuxexpert-practice-labs/labs/lfca/6-4-open-source-licensing/README.md

LFCA 6.4: Open source software and licensing

Finding the licenses of installed packages, and signing off a commit.

Before you start

Work as root (sudo -i), so ~ is /root. Answers go in /root/lab-answers/<task>. The lab only checks that ~/practice-repo doesn't exist yet, and notes whether you already have a ~/.gitconfig and Git (reset removes the ones the lab didn't find).

Tasks

1. Find the license of bash, curl, OpenSSL, SQLite and zlib from their package files, and say whether each is permissive, copyleft or public domain. Write one line per program to /root/lab-answers/1: the name in lowercase, a space, and the kind, such as bash copyleft.
2. Install Git if it's missing, set your name and email, create a practice repository ~/practice-repo, make a commit with git commit -s, and look at the Signed-off-by line.

Hints

• Ubuntu: the Files: * section of /usr/share/doc/PACKAGE/copyright. RHEL family: rpm -q --qf '%{LICENSE}\n' PACKAGE.
• Package names differ: dpkg -S $(command -v curl) or rpm -qf $(command -v curl) finds the one for a program. For a library with no program, dpkg -S libz.so.1 or rpm -qf /usr/lib64/libz.so.1. SQLite's command-line tool may not be installed; its library is (libsqlite3-0 on Ubuntu, sqlite-libs on the RHEL family).
• rpm calls SQLite's license blessing: SPDX's name for its public-domain dedication.
• git config --global user.name, user.email; git init, git commit -s -m "...", git log -1.