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Add mechanism for platform to provide image creation time #292

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merged 3 commits into from
Mar 30, 2022
Merged

Add mechanism for platform to provide image creation time #292

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6135181
Add mechanism for platform to provide image creation time.
natalieparellano Feb 11, 2022
d6060b7
Add details for exporter
natalieparellano Feb 16, 2022
a3ff2cb
Remove superfluous wording in reproducibility
natalieparellano Mar 16, 2022
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3 changes: 2 additions & 1 deletion platform.md
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Expand Up @@ -546,6 +546,7 @@ Usage:
| `<stack>` | `CNB_STACK_PATH` | `/cnb/stack.toml` | Path to stack file (see [`stack.toml`](#stacktoml-toml)
| `<uid>` | `CNB_USER_ID` | | UID of the build image `User`
| `<layers>/config/metadata.toml` | | | Build metadata (see [`metadata.toml`](#metadatatoml-toml)
| | `SOURCE_DATE_EPOCH` | | Timestamp for `created` time in app image config |
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Though other variables used to configure the lifecycle start with CNB_ it seems better keep the interface consistent with other tooling (see under "Reading the variable" here).


- At least one `<image>` must be provided
- Each `<image>` MUST be a valid tag reference
Expand Down Expand Up @@ -601,7 +602,7 @@ Usage:
- `io.buildpacks.build.metadata`: see [build metadata](#iobuildpacksbuildmetadata-json)
- To ensure [build reproducibility](#build-reproducibility), the lifecycle:
- SHOULD set the modification time of all files in newly created layers to a constant value
- SHOULD set the `created` time in image config to a constant value
- SHOULD set the `created` time in image config to `SOURCE_DATE_EPOCH`, or to a constant value if not defined

- The lifecycle SHALL write a [report](#reporttoml-toml) to `<report>` describing the exported app image

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