VCS PKGBUILD that doesn't change pkgver

PKGBUILD

_pkgver() {
	(cd YOUR_GIT_REPOSITORY &>/dev/null && git describe --long --tags | sed 's/\([^-]*-g\)/r\1/;s/-/./g') || echo latest
}

pkgname=YOUR_PACKAGE
pkgver=$(_pkgver)
pkgrel=1
...
source=('YOUR_GIT_REPOSITORY::git+https://github.com/example/example.git')
sha256sums=('SKIP')

prepare() {
	pkgver=$(_pkgver)
}