fedora: Change source URL to HEAD link with explicit commit SHA

This is required as Fedora doesn't accept a temporary pointer to
a source URL.

Reported-by: Ralf Corsepius <rc040203@freenet.de>
Reported-by: Artur Frenszek-Iwicki <fedora@svgames.pl>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

contrib/fedora/passt.spec

@@ -18,7 +18,7 @@ Summary:	User-mode networking daemons for virtual machines and namespaces
 License:	AGPLv3+ and BSD
 Group:		System Environment/Daemons
 URL:		https://passt.top/
-Source:		https://passt.top/passt/snapshot/passt-HEAD.tar.xz
+Source:		https://passt.top/passt/snapshot/passt-{{{ git_head }}}.tar.xz
 
 BuildRequires:	gcc, make, checkpolicy, selinux-policy-devel
 
@@ -43,7 +43,7 @@ Requires(preun): policycoreutils, %{name}
 This package adds SELinux enforcement to passt(1) and pasta(1).
 
 %prep
-%setup -q -n passt-HEAD
+%setup -q -n passt-{{{ git_head }}}
 
 %build
 export CFLAGS="%{optflags}"

contrib/fedora/rpkg.macros

@@ -15,6 +15,10 @@ function git_version {
 	printf "0.git.%s.%s" "$(date -u -I | tr - _)" "$(git rev-parse --short HEAD)"
 }
 
+function git_head {
+	git rev-parse HEAD
+}
+
 function passt_git_changelog_entry {
 	__from="${2}"
 	__to="${1}"