ci: Delete dockerfile, move to common scripts, consolidate gcc/clang

The Dockerfile is problematic since we can't update it atomically. I also really
dislike reliance on the Hub. Further, I think rather than caching our build deps
as built containers, we should be caching RPMs in CI. And we should be using
rpm-ostree at some point to assemble filesystem trees faster.

Also, consolidate the clang to be serial with gcc, since while we lose a tiny
bit of parallelism, it's not really worth its own context right now.

.redhat-ci.yml

@@ -3,36 +3,15 @@ branches:
     - auto
     - try
 
-context: check
+context: f25-build-check
 
 required: true
 
 container:
-    image: projectatomic/rpm-ostree-tester
-
-# ⚠ Pull latest ostree for https://github.com/ostreedev/ostree/issues/758
-# And we now depend on 2017.4
-# Also, there's a copy of this below in the compose context
-# And also in tests/vmcheck/overlay.sh
-packages:
-  - https://kojipkgs.fedoraproject.org//packages/ostree/2017.5/2.fc25/x86_64/ostree-2017.5-2.fc25.x86_64.rpm
-  - https://kojipkgs.fedoraproject.org//packages/ostree/2017.5/2.fc25/x86_64/ostree-devel-2017.5-2.fc25.x86_64.rpm
-  - https://kojipkgs.fedoraproject.org//packages/ostree/2017.5/2.fc25/x86_64/ostree-libs-2017.5-2.fc25.x86_64.rpm
-
-env:
-    CFLAGS: '-fsanitize=undefined'
-
-build:
-    config-opts: >
-      --prefix=/usr
-      --libdir=/usr/lib64
-      --enable-installed-tests
-      --enable-gtk-doc
+    image: registry.fedoraproject.org/fedora:25
 
 tests:
-    - make check
-    - gnome-desktop-testing-runner rpm-ostree
-    - sudo --user=testuser gnome-desktop-testing-runner rpm-ostree
+  - ci/build.sh
 
 timeout: 30m
 
@@ -44,29 +23,6 @@ artifacts:
 
 inherit: true
 
-context: Clang
-
-required: true
-
-env:
-    CC: 'clang'
-    CFLAGS: '-Werror=unused-variable'
-
-build:
-    config-opts: >
-      --prefix=/usr
-      --libdir=/usr/lib64
-      --enable-installed-tests
-      --enable-gtk-doc
-      --enable-new-name
-
-tests:
-artifacts:
-
----
-
-inherit: true
-
 context: vmcheck
 
 required: true
@@ -83,6 +39,7 @@ cluster:
     image: projectatomic/rpm-ostree-tester
 
 tests:
+  - ./ci/build.sh
   - make vmcheck HOSTS="vmcheck1 vmcheck2 vmcheck3"
 
 artifacts:
@@ -107,16 +64,7 @@ host:
 tests:
   - >
       docker run --privileged -v $(pwd):/srv/code --rm
-      projectatomic/rpm-ostree-tester /bin/sh -c "
-      yum -y install https://kojipkgs.fedoraproject.org//packages/ostree/2017.5/2.fc25/x86_64/ostree-{,libs-,devel-,grub2-}2017.5-2.fc25.x86_64.rpm &&
-      cd /srv/code &&
-      env NOCONFIGURE=1 ./autogen.sh &&
-      ./configure --prefix=/usr --libdir=/usr/lib64 &&
-      make &&
-      make install &&
-      dnf update -y bubblewrap &&
-      ./tests/compose
-      "
+      registry.fedoraproject.org/fedora:25 /bin/sh -c "cd /srv/code && ./ci/build.sh && make install && ./tests/compose"
 
 artifacts:
   - compose.log

ci/build-deps.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/bash
+# Install build dependencies in a container
+
+set -xeuo pipefail
+
+dnf -y install dnf-plugins-core
+dnf config-manager --set-enabled updates-testing
+dnf install -y @buildsys-build
+dnf install -y 'dnf-command(builddep)'
+dnf builddep -y rpm-ostree
+dnf install -y rpm-ostree
+rpm -e rpm-ostree
+
+# ⚠ Pull latest ostree for https://github.com/ostreedev/ostree/issues/758
+# And we now depend on 2017.4
+# Also, there's a copy of this below in the compose context
+# And also in tests/vmcheck/overlay.sh
+yum -y install https://kojipkgs.fedoraproject.org//packages/ostree/2017.5/2.fc25/x86_64/ostree-{,libs-,devel-,grub2-}2017.5-2.fc25.x86_64.rpm
+
+dnf install -y ostree createrepo_c /usr/bin/jq PyYAML clang \
+               libubsan libasan libtsan elfutils fuse sudo gnome-desktop-testing
+
+# create an unprivileged user for testing
+adduser testuser

ci/build.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/bash
+# Install build dependencies, run unit tests and installed tests.
+
+set -xeuo pipefail
+
+build() {
+    env NOCONFIGURE=1 ./autogen.sh
+    ./configure --prefix=/usr --libdir=/usr/lib64 "$@"
+    make -j 8
+}
+build_default() {
+    build --enable-installed-tests --enable-gtk-doc
+}
+
+dn=$(dirname $0)
+${dn}/build-deps.sh
+export CFLAGS='-fsanitize=undefined'
+build_default
+make check
+gnome-desktop-testing-runner rpm-ostree
+sudo --user=testuser gnome-desktop-testing-runner rpm-ostree
+git clean -dfx
+
+# And now a clang build to find unused variables
+export CC=clang
+export CFLAGS='-Werror=unused-variable'
+build_default