auto pkgver

.SRCINFO

@@ -1,7 +1,7 @@
 pkgbase = gvisor-git
 	pkgdesc = User-space kernel, sandboxed container runtime
-	pkgver = 42.b5a0667
-	pkgrel = 2
+	pkgver = r42.b5a0667
+	pkgrel = 1
 	url = https://github.com/google/gvisor
 	arch = x86_64
 	license = Apache-2.0

PKGBUILD

@@ -2,8 +2,8 @@
 
 _pkgname='gvisor'
 pkgname="${_pkgname}-git"
-pkgver=42.b5a0667
-pkgrel=2
+pkgver=r42.b5a0667
+pkgrel=1
 pkgdesc="User-space kernel, sandboxed container runtime"
 arch=('x86_64')
 url='https://github.com/google/gvisor'
@@ -13,6 +13,11 @@ source=("git+https://github.com/google/${_pkgname}")
 provides=('runsc')
 makedepends=('bazel' 'python')
 
+pkgver() {
+    cd "${_pkgname}"
+    printf "r%s.%s" "$(git rev-list --count HEAD)" "$(git rev-parse --short HEAD)"
+}
+
 build() {
   cd "${srcdir}/${_pkgname}"
   bazel build runsc