Add configuration for Cirrus-CI

Testing podman requires exercising on a full-blown VM.  The current
containerized-approach is complicated, and mostly a band-aid over
shortcomings in the other CI systems.  Namely, we want:

* To pre-build environments with dependencies to reduce the
  setup time needed for testing.
* The ability to verify the pre-built environments are working
  before utilizing them for further testing.
* A simple, single set of flexible automation instructions to
  reduce maintenance burden.
* Ease of environment reproduction across clouds or locally, for
  debugging failures.

This change leverages Cirrus-CI + Packer + collection of shell scripts
to realize all of the above.

Signed-off-by: Chris Evich <cevich@redhat.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/contrib/cirrus/setup_environment.sh b/contrib/cirrus/setup_environment.sh
new file mode 100755
index 000000000..2302f0e15
--- /dev/null
+++ b/contrib/cirrus/setup_environment.sh
@@ -0,0 +1,77 @@
+#!/bin/bash
+
+set -e
+source $(dirname $0)/lib.sh
+
+req_env_var "
+CI $CI
+USER $USER
+HOME $HOME
+ENVLIB $ENVLIB
+SCRIPT_BASE $SCRIPT_BASE
+CIRRUS_BUILD_ID $CIRRUS_BUILD_ID"
+
+[[ "$SHELL" =~ "bash" ]] || chsh -s /bin/bash
+
+cd "$CIRRUS_WORKING_DIR"  # for clarity of initial conditions
+
+# Verify basic dependencies
+for depbin in go rsync unzip sha256sum curl make
+do
+    if ! type -P "$depbin" &> /dev/null
+    then
+        echo "ERROR: $depbin binary not found in $PATH"
+        exit 2
+    fi
+done
+
+# Setup env. vars common to all tasks/scripts/platforms and
+# ensure they return for every following script execution.
+MARK="# Added by $0, manual changes will be lost."
+touch "$HOME/$ENVLIB"
+if ! grep -q "$MARK" "$HOME/$ENVLIB"
+then
+    cp "$HOME/$ENVLIB" "$HOME/${ENVLIB}_original"
+    # N/B: Single-quote items evaluated every time, double-quotes only once (right now).
+    for envstr in \
+        "$MARK" \
+        "export HEAD=\"$CIRRUS_CHANGE_IN_REPO\"" \
+        "export TRAVIS=\"1\"" \
+        "export GOSRC=\"$CIRRUS_WORKING_DIR\"" \
+        "export OS_RELEASE_ID=\"$(os_release_id)\"" \
+        "export OS_RELEASE_VER=\"$(os_release_ver)\"" \
+        "export OS_REL_VER=\"${OS_RELEASE_ID}-${OS_RELEASE_VER}\"" \
+        "export GOPATH=\"/go\"" \
+        'export PATH="$HOME/bin:$GOPATH/bin:/usr/local/bin:$PATH"' \
+        'export LD_LIBRARY_PATH="/usr/local/lib${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}"'
+    do
+        # Make permanent in later shells, and set in current shell
+        X=$(echo "$envstr" | tee -a "$HOME/$ENVLIB") && eval "$X" && echo "$X"
+    done
+
+    # Some setup needs to vary between distros
+    case "${OS_RELEASE_ID}-${OS_RELEASE_VER}" in
+        ubuntu-18)
+            envstr='export BUILDTAGS="seccomp $($GOSRC/hack/btrfs_tag.sh) $($GOSRC/hack/btrfs_installed_tag.sh) $($GOSRC/hack/ostree_tag.sh) varlink exclude_graphdriver_devicemapper"'
+            ;;
+        fedora-28) ;&  # Continue to the next item
+        centos-7) ;&
+        rhel-7)
+            envstr='unset BUILDTAGS'  # Use default from Makefile
+            ;;
+        *) bad_os_id_ver ;;
+    esac
+    X=$(echo "$envstr" | tee -a "$HOME/$ENVLIB") && eval "$X" && echo "$X"
+
+    # Do the same for golang env. vars
+    go env | while read envline
+    do
+        X=$(echo "export $envline" | tee -a "$HOME/$ENVLIB") && eval "$X" && echo "$X"
+    done
+
+    cd "${GOSRC}/"
+    source "$SCRIPT_BASE/lib.sh"
+
+    # Only testing-VMs need deps installed
+    [[ -n "$PACKER_BUILDS" ]] || install_testing_dependencies  # must exist in $GOPATH
+fi