Makefile,ci.sh: use versioned images

Get a voom style git hash of the impl Dockerfile and use that as the
testing docker image version (rather than blank which implies "latest").

.github/workflows/main.yml

@@ -38,6 +38,8 @@ jobs:
       matrix: ${{ fromJson(needs.get-matrix.outputs.matrix-linux) }}
     steps:
       - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0  # Need full history for voom like versions
       - name: Build
         run: |
           export ${{ matrix.IMPL }}

Makefile

@@ -126,7 +126,7 @@ STEP_TEST_FILES = $(strip $(wildcard \
 
 # DOCKERIZE utility functions
 lc = $(subst A,a,$(subst B,b,$(subst C,c,$(subst D,d,$(subst E,e,$(subst F,f,$(subst G,g,$(subst H,h,$(subst I,i,$(subst J,j,$(subst K,k,$(subst L,l,$(subst M,m,$(subst N,n,$(subst O,o,$(subst P,p,$(subst Q,q,$(subst R,r,$(subst S,s,$(subst T,t,$(subst U,u,$(subst V,v,$(subst W,w,$(subst X,x,$(subst Y,y,$(subst Z,z,$1))))))))))))))))))))))))))
-impl_to_image = kanaka/mal-test-$(call lc,$(1))
+impl_to_image = kanaka/mal-test-$(call lc,$(1)):$(shell ./voom-like-version.sh impls/$(1)/Dockerfile)
 
 actual_impl = $(if $(filter mal,$(1)),$(patsubst %-mal,%,$(MAL_IMPL)),$(1))
 

ci.sh

@@ -52,9 +52,10 @@ echo "TEST_OPTS: ${TEST_OPTS}"
 # the Travis/Github Actions image/tools directly.
 if [ -z "${NO_DOCKER}" ]; then
     img_impl=$(echo "${MAL_IMPL:-${IMPL}}" | tr '[:upper:]' '[:lower:]')
+    img_ver=$(./voom-like-version.sh impls/${img_impl}/Dockerfile)
     # We could just use make DOCKERIZE=1 instead but that does add
     # non-trivial startup overhead for each step.
-    MAKE="docker run -i -u $(id -u) -v `pwd`:/mal kanaka/mal-test-${img_impl%%-mal} ${MAKE}"
+    MAKE="docker run -i -u $(id -u) -v `pwd`:/mal kanaka/mal-test-${img_impl%%-mal}:${img_ver} ${MAKE}"
 fi
 
 case "${ACTION}" in

voom-like-version.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+echo $(TZ=UTC git log -1 --pretty=%ad-g%h --date=format-local:"%Y%m%d_%H%M%S" -- "$@")$(test -z "$(git status --short -- "$@")" || echo _DIRTY)