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Allow bake files to be specified via environment variable

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The environment variable `BUILDX_BAKE_FILE` (and optional variable
`BUILDX_BAKE_FILE_SEPARATOR`) can be used to specify one or more bake
files (similar to `compose`).  This is mutually exclusive with`--file`
(which takes precedence).

This is done very early to ensure the values are treated just like
`--file`, e.g., participate in telemetry.  This includes leaving
relative paths as-is, which deviates from `compose` (which makes them
absolute).

Signed-off-by: Roberto Villarreal <rrjjvv@yahoo.com>
This commit is contained in:
Roberto Villarreal
2025-06-16 00:08:54 -06:00
parent eb43f4c237
commit cb54ddb9fe
3 changed files with 208 additions and 0 deletions
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docs/reference/buildx_bake.md
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@@ -143,6 +143,11 @@ Use the `-f` / `--file` option to specify the build definition file to use.
The file can be an HCL, JSON or Compose file. If multiple files are specified,
all are read and the build configurations are combined.
Alternatively, the environment variable `BUILDX_BAKE_FILE` can be used to specify the build definition to use.
This is mutually exclusive with `-f` / `--file`; if both are specified, the environment variable is ignored.
Multiple definitions can be specified by separating them with the system's path separator
(typically `;` on Windows and `:` elsewhere), but can be changed with `BUILDX_BAKE_PATH_SEPARATOR`.
You can pass the names of the targets to build, to build only specific target(s).
The following example builds the `db` and `webapp-release` targets that are
defined in the `docker-bake.dev.hcl` file: