justfile: Truncate container tag string if too long (2nd attempt)

Containers' tags can't be longer than 128 characters. Sometimes CI
generates tags that are longer than this (thanks Dependabot for the
extra-long branch names).

Make sure we don't break docker builds by having bash truncate the
string if necessary - everywhere we need it.

Fixes: b88ec42 ("Build system")
Signed-off-by: Quentin Monnet <[email protected]>

justfile

@@ -84,6 +84,9 @@ _clean := ```
 
 _slug := (if _clean == "clean" { "" } else { "dirty-_-" }) + _branch
 
+# Define a function to truncate long lines to the limit for containers tags
+_define_truncate128 := 'truncate128() { printf -- "%s" "${1::128}" ; }'
+
 # The time of the build (in iso8601 utc)
 
 _build_time := datetime_utc("%+")
@@ -360,6 +363,7 @@ sterile-build: (sterile "_network=none" "cargo" "--locked" "build" ("--profile="
 [script]
 build-container: sterile-build
     {{ _just_debuggable_ }}
+    {{ _define_truncate128 }}
     declare build_date
     build_date="$(date --utc --iso-8601=date --date="{{ _build_time }}")"
     declare -r build_date
@@ -374,40 +378,41 @@ build-container: sterile-build
       --label "build.date=${build_date}" \
       --label "build.timestamp={{ _build_time }}" \
       --label "build.time_epoch=${build_time_epoch}" \
-      --tag "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}" \
+      --tag "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")" \
       --build-arg ARTIFACT="artifact/{{ target }}/{{ profile }}/scratch" \
       .
 
     sudo -E docker tag \
-      "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}" \
-      "{{ _container_repo }}:{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}"
+      "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")" \
+      "{{ _container_repo }}:$(truncate128 "{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")"
     sudo -E docker tag \
-      "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}" \
-      "{{ _container_repo }}:{{ _slug }}.{{ target }}.{{ profile }}"
+      "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")" \
+      "{{ _container_repo }}:$(truncate128 "{{ _slug }}.{{ target }}.{{ profile }}")"
     if [ "{{ target }}" = "x86_64-unknown-linux-gnu" ]; then
       sudo -E docker tag \
-        "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}" \
-        "{{ _container_repo }}:{{ _slug }}.{{ profile }}"
+        "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")" \
+        "{{ _container_repo }}:$(truncate128 "{{ _slug }}.{{ profile }}")"
     fi
     if [ "{{ target }}" = "x86_64-unknown-linux-gnu" ] && [ "{{ profile }}" = "release" ]; then
       sudo -E docker tag \
-        "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}" \
-        "{{ _container_repo }}:{{ _slug }}"
+        "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")" \
+        "{{ _container_repo }}:$(truncate128 "{{ _slug }}")"
     fi
 
 # Build and push containers
 [script]
 push-container: build-container
+    {{ _define_truncate128 }}
     declare build_date
     build_date="$(date --utc --iso-8601=date --date="{{ _build_time }}")"
     declare -r build_date
-    sudo -E docker push "{{ _container_repo }}:${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}"
-    sudo -E docker push "{{ _container_repo }}:{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}"
+    sudo -E docker push "{{ _container_repo }}:$(truncate128 "${build_date}.{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")"
+    sudo -E docker push "{{ _container_repo }}:$(truncate128 "{{ _slug }}.{{ target }}.{{ profile }}.{{ _commit }}")"
     if [ "{{ target }}" = "x86_64-unknown-linux-gnu" ]; then
-      sudo -E docker push "{{ _container_repo }}:{{ _slug }}.{{ profile }}"
+      sudo -E docker push "{{ _container_repo }}:$(truncate128 "{{ _slug }}.{{ profile }}")"
     fi
     if [ "{{ target }}" = "x86_64-unknown-linux-gnu" ] && [ "{{ profile }}" = "release" ]; then
-      sudo -E docker push "{{ _container_repo }}:{{ _slug }}"
+      sudo -E docker push "{{ _container_repo }}:$(truncate128 "{{ _slug }}")"
     fi
 
 # Run the tests (with nextest)