pkg build: add env var support for mirror, org, builder image and config#4205
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justincormack merged 1 commit intolinuxkit:masterfrom Mar 12, 2026
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Introduce environment variables for key CI/CD flags so that self-hosted
runners (e.g. GitHub Actions) can configure registry mirrors and push
targets without modifying calling Makefiles:
- LINUXKIT_MIRROR - equivalent to --mirror (space/comma-separated);
CLI flags take precedence (last SetProxy wins)
- LINUXKIT_PKG_ORG - equivalent to --org for all pkg subcommands
- LINUXKIT_BUILDER_IMAGE - equivalent to --builder-image
- LINUXKIT_BUILDER_CONFIG - equivalent to --builder-config
All env var constants are consolidated in pkg_build.go alongside the
existing LINUXKIT_CACHE, LINUXKIT_BUILDER_NAME, LINUXKIT_BUILDERS.
Priority for all: CLI flag > env var > built-in default
Adds a new Environment Variables section to docs/packages.md with a
reference table covering all LINUXKIT_* vars and a note explaining the
two-layer mirror configuration required in CI (linuxkit pulls vs
buildkit Dockerfile pulls).
Signed-off-by: Roman Shaposhnik <[email protected]>
Signed-off-by: Mikhail Malyshev <[email protected]>
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justincormack
approved these changes
Mar 12, 2026
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Summary
Adds environment variable equivalents for four flags that are commonly needed when running linuxkit on CI/CD self-hosted runners with private registry mirrors, so callers (e.g.
makein downstream projects) don't need to be modified to pass these flags explicitly.LINUXKIT_MIRROR--mirrorLINUXKIT_PKG_ORG--orgpkgsubcommandsLINUXKIT_BUILDER_IMAGE--builder-imagepkg buildLINUXKIT_BUILDER_CONFIG--builder-configpkg buildPriority: CLI flag > env var > built-in default (consistent with existing
LINUXKIT_CACHE,LINUXKIT_BUILDER_NAME,LINUXKIT_BUILDERS).LINUXKIT_MIRRORaccepts the same format as--mirror([registry=]url), as a space- or comma-separated list. Env var entries are prepended to CLI-provided entries so that the finalSetProxycall for a given registry key comes from the CLI flag, giving it precedence.LINUXKIT_BUILDER_IMAGEandLINUXKIT_BUILDER_CONFIGuse the existingflagOverEnvVarOverDefaultStringhelper (same pattern asLINUXKIT_BUILDER_NAME).Test plan
go build ./...passesgo test -mod=vendor ./...passes (all existing tests green)LINUXKIT_MIRROR=docker.io=http://mymirrorand verify linuxkit routes pulls through the mirrorLINUXKIT_PKG_ORG=myorgand verifylinuxkit pkg show-tagreflects the org overrideLINUXKIT_BUILDER_IMAGEand verify the builder container uses the specified image🤖 Generated with Claude Code