This script builds GnuPG from source. Extra features, unsafe
cryptographic primitives, and compression is all disabled. Only
pinentry-tty is built. All binaries are static, which is done by first
building musl and then linking against it. The final installation is
~18MB.
Unfortunately the installation prefix is hardcoded in the binaries, so
the final installation isn't relocatable. Though the binaries will work
on any Linux system with the same architecture so long as they're
installed to the same prefix. The script's -p option controls the
install prefix, which defaults to gnupg/ in the working directory. The
-d option sets DESTDIR to stage for packaging.
I only test on Debian, and the script likely requires tweaking for non-Debian systems. The main value is capturing a bunch of subtle configuration details I figured out. I'm unlikely to keep all the individual package versions up to date.
Note: Since binaries are statically linked, some memory safety security features are disabled, such as ASLR.
GnuPG has a bug where it will use /usr/bin/gpg-agent instead of the
gpg-agent built by the script, despite being told explicitly to use the
local version. If there's a system-installed GnuPG, you're likely to
see "WARNING: server 'gpg-agent' is older than us". Until this is fixed,
either ignore the warning or uninstall the system's GnuPG.
$ ./build.sh
It will download all the source tarballs on the first run and re-use them for repeated builds.