Created
December 22, 2020 16:17
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ONBUILD & buildah
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| $ cat << EOF > Dockerfile | |
| FROM fedora:latest | |
| RUN touch /foo | |
| ONBUILD RUN touch /bar | |
| EOF | |
| $ cat << EOF > Dockerfile-2 | |
| FROM onbuild-image | |
| RUN touch /baz | |
| EOF | |
| $ buildah bud --format=docker -f Dockerfile -t onbuild-image . | |
| STEP 1: FROM fedora:latest | |
| Resolved short name "fedora" to a recorded short-name alias (origin: /etc/containers/registries.conf.d/shortnames.conf) | |
| Getting image source signatures | |
| Copying blob 8fde7942e775 done | |
| Copying config 79fd58dc76 done | |
| Writing manifest to image destination | |
| Storing signatures | |
| STEP 2: RUN touch /foo | |
| STEP 3: ONBUILD RUN touch /bar | |
| STEP 4: COMMIT onbuild-image | |
| Getting image source signatures | |
| Copying blob b4fa6ff1346d skipped: already exists | |
| Copying blob e90546eff3bf done | |
| Copying config fdd6a5ac4f done | |
| Writing manifest to image destination | |
| Storing signatures | |
| --> fdd6a5ac4f9 | |
| fdd6a5ac4f9769b55078ff8a4d98463183f5885ed8ff2764b164430c8706678e | |
| $ buildah bud --format=docker -f Dockerfile-2 -t result-image . | |
| STEP 1: FROM onbuild-image | |
| STEP 2: RUN touch /bar | |
| STEP 3: RUN touch /baz | |
| STEP 4: COMMIT result-image | |
| Getting image source signatures | |
| Copying blob b4fa6ff1346d skipped: already exists | |
| Copying blob e90546eff3bf skipped: already exists | |
| Copying blob 4489028f0344 done | |
| Copying config da7b78f02c done | |
| Writing manifest to image destination | |
| Storing signatures | |
| --> da7b78f02c9 | |
| da7b78f02c9f302de2826f2f799607cf8013166d9f848e59bbe1f08a5786e94d | |
| $ buildah inspect --format '{{.Docker.Config.OnBuild}}' onbuild-image | |
| [RUN touch /bar] | |
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