ci: Verify rustfmt

Split out the command into a separate `Makefile` that doesn't
use Automake so we can invoke it early.

Closes: #1674
Approved by: dustymabe

Makefile-extra.inc

@@ -0,0 +1,13 @@
+# -*- mode: makefile -*-
+# This file defines rules that don't depend on Automake.
+# The main idea here is some things we may want to execute
+# from CI before we've even run automake, and secondly
+# one can avoid rerunning Automake when these rules change.
+#
+# Specifically right now one can invoke e.g.
+# `make -f Makefile-extra.inc rustfmt` directly.
+
+rustfmt:
+	rustfmt rust/src/*.rs
+.PHONY: rustfmt
+

Makefile-rpm-ostree.am

@@ -127,10 +127,6 @@ endif
 
 rpm_ostree_CFLAGS += $(PKGDEP_RPMOSTREE_RS_CFLAGS)
 rpm_ostree_LDADD += $(librpmostree_rust_path) $(PKGDEP_RPMOSTREE_RS_LIBS)
-rustfmt:
-	rustfmt $(filter %.rs,$(LIBRPMOSTREE_RUST_SRCS))
-# Outside the ifdef, otherwise automake complains
-.PHONY: rustfmt
 
 # Wraps `cargo test`.  This is always a debug non-release build;
 # the main thing here is we still drop the `target` dir in our build

Makefile.am

@@ -16,6 +16,7 @@
 # Boston, MA 02111-1307, USA.
 
 include Makefile-decls.am
+include Makefile-extra.inc
 
 newname = nts
 if BUILDOPT_NEW_NAME

ci/build-check.sh

@@ -5,6 +5,25 @@ set -xeuo pipefail
 
 dn=$(dirname $0)
 . ${dn}/libbuild.sh
+
+# Add checks here which depend on the build container
+# but don't require a full build (code static analysis).
+if test -x /usr/bin/rustfmt; then
+    echo "Verifying rustfmt"
+    if !git diff --quiet --exit-code; then
+        echo "outstanding diff before rustfmt" 1>&2
+        exit 1
+    fi
+    make -f Makefile-extra.inc rustfmt
+    if git diff --quiet --exit-code; then
+        git diff
+        echo "Please run rustfmt"
+        exit 1
+    fi
+else
+    echo "No /usr/bin/rustfmt, skipping"
+fi
+
 ${dn}/build.sh
 # NB: avoid make function because our RPM building doesn't
 # support parallel runs right now

ci/codestyle.sh

@@ -1,5 +1,6 @@
 #!/bin/sh
 set -xeuo pipefail
+
 echo "Checking for tabs:"
 (git grep -E '^	+' -- '*.[ch]' || true) > tabdamage.txt
 if test -s tabdamage.txt; then
@@ -7,4 +8,5 @@ if test -s tabdamage.txt; then
     cat tabdamage.txt
     exit 1
 fi
+
 echo "ok"

ci/installdeps.sh

@@ -29,5 +29,5 @@ pkg_install ostree{,-devel,-grub2} createrepo_c /usr/bin/jq PyYAML \
     libubsan libasan libtsan elfutils fuse sudo python-gobject-base \
     selinux-policy-devel selinux-policy-targeted python2-createrepo_c \
     rsync rpm-python # provided by python2-rpm on Fedora
-# For ex-container tests and clang build
+# For more CI testing
-pkg_install_if_os fedora parallel clang
+pkg_install_if_os fedora parallel clang rustfmt-preview