Fix Dockerfile linter warnings #1042

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MrUnknownDE · 2026-04-06T01:34:11+02:00

MrUnknownDE commented

2026-04-06 01:34:11 +02:00

Originally created by @dfunkt on 7/17/2024

they seem to have started appearing with buildx v0.16.0

Alpine warnings:

13 warnings found (use --debug to expand):
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 37)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 38)
 - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 133)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 35)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 36)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 42)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 29)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 36)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 42)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 34)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 37)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 38)

Debian warnings:

5 warnings found (use --debug to expand):
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29)
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 38)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 29)
 - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 34)
 - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 171)

For FromPlatformFlagConstDisallowed I decided to use the 3rd variant from here:
https://github.com/moby/buildkit/blob/master/frontend/dockerfile/linter/docs/FromPlatformFlagConstDisallowed.md#description

*Originally created by @dfunkt on 7/17/2024* - they seem to have started appearing with buildx v0.16.0 Alpine warnings: ``` 13 warnings found (use --debug to expand): - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 37) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 38) - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 133) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 35) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 36) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 42) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 29) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 36) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 42) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 34) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 37) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 38) ``` Debian warnings: ``` 5 warnings found (use --debug to expand): - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 29) - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 38) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 29) - FromPlatformFlagConstDisallowed: FROM --platform flag should not use constant value "linux/amd64" (line 34) - RedundantTargetPlatform: Setting platform to predefined $TARGETPLATFORM in FROM is redundant as this is the default behavior (line 171) ``` For ```FromPlatformFlagConstDisallowed``` I decided to use the 3rd variant from here: https://github.com/moby/buildkit/blob/master/frontend/dockerfile/linter/docs/FromPlatformFlagConstDisallowed.md#description

MrUnknownDE closed this issue

2026-04-06 01:34:11 +02:00

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Reference: github/vaultwarden#1042