docs: fix bake set flag note #3474
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Signed-off-by: CrazyMax <[email protected]>
crazy-max
commented
Oct 17, 2025
| > | ||
| > `--set` is a repeatable flag. For array fields such as `tags`, repeat `--set` to provide multiple values or use the `+=` operator to append without replacing. | ||
| > Array literal syntax like `--set target.tags=[a,b]` is not supported. | ||
| > The `platform` field is a special case. It also accepts a comma-separated list. |
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platform is actually not a special case:
# docker-bake.hcl
target "default" {}$ docker buildx bake --set "*.platform=linux/amd64,linux/arm64" --print
{
"group": {
"default": {
"targets": [
"default"
]
}
},
"target": {
"default": {
"context": ".",
"dockerfile": "Dockerfile",
"platforms": [
"linux/amd64,linux/arm64"
]
}
}
}
It needs to be repeated:
$ docker buildx bake --set "*.platform=linux/amd64" --set "*.platform=linux/arm64" --print
{
"group": {
"default": {
"targets": [
"default"
]
}
},
"target": {
"default": {
"context": ".",
"dockerfile": "Dockerfile",
"platforms": [
"linux/amd64",
"linux/arm64"
]
}
}
}
aevesdocker
approved these changes
Oct 17, 2025
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aevesdocker
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I'll get this updated in the docs repo as well
tonistiigi
approved these changes
Oct 22, 2025
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