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Fix env.LookupEnv treating values that start with "env" as references - #284
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LookupEnv sent every value that began with the letters "env" to the remote fetch, so a plain value such as "envroot" resolved to empty. In MinIO AIStor, MINIO_ROOT_USER=envroot stopped the server, and two such root values made it use the default credentials (miniohq/aistor#8200). A value is now a reference only when its scheme, in any letter case, is "env" or "env+tls" followed by "://".
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly describes the main change: correcting env.LookupEnv so values that merely start with "env" are not treated as references.
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I’m a rabbit checking schemes in the morning light.env:// and env+tls:// come through just right.
I test the values, errors, and cache along the way.
A malformed link opens no connection today.
Then I hop home with the defaults in my tray.
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Inline comments:
Review comments at @env/web_env.go:
- Around line 170-183: Normalize the parsed URL scheme before transport
selection so mixed-case env references reach the correct transport. Update the
scheme switch in getEnvValueFromHTTP to compare a lowercase scheme, preserving
case-insensitive handling for both supported schemes.
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The row pointed at a closed port, so a dial error also satisfied it, and a change that stopped rejecting unparsable references went unnoticed. It now points at the live test server.
govulncheck fails on main since the Go vulnerability database update of 2026-10-08. golang.org/x/net v0.58.0 has four symbol-level findings (GO-2026-6603, GO-2026-6611, GO-2026-6612, GO-2026-6617) and one package-level finding (GO-2026-6610); v0.60.0 fixes all five. The other golang.org/x versions are the ones x/net v0.60.0 and x/text v0.42.0 require.
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Inline comments:
Review comments at @env/env_test.go:
- Line 213: Update the “unparsable reference” case in the `LookupEnv` tests to
assert that the error originates from `url.Parse`, not from a later HTTP request
or dial failure. Preserve the malformed reference input and verify the
parse-error behavior explicitly.
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The row passed when a change sent the malformed reference and then failed on the response, because any error satisfied it. The row now points at its own listener and requires no accepted connection and a url.EscapeError.
shtripat
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shtripat
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I reproduced the bug on 03de1bc: the new test fails 11 rows and passes 7 there, and all 18 pass here. Every clause in the new condition is caught by a mutant except ok, which is redundant (note inline). With go1.26.9, govulncheck exits 3 on base and 0 on this branch, and go.mod/go.sum match #283 byte for byte. One small correction to the description follows as a separate comment.
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A small correction to the description: "VulnCheck has failed on Suggested fix:
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The ok check is redundant: an unset variable reads as "", which has no "://", so found already rejects it. Lowercase the scheme only when the value contains "://", so a plain value such as a password is never copied.
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@shtripat You were right that VulnCheck had not run on I merged |
Description
env.LookupEnvtreats a value as a remote reference only when it starts withenv://orenv+tls://, in any letter case. Before this change, any value that began with the lettersenvwas handled as a remote reference.env/web_env.go: split the value on://and compare the part before it withstrings.ToLower.strings.EqualFoldis not used because it also matches non-ASCII lookalikes such as U+017F (long s), whichurl.Parserejects.env/env_test.go: new table testTestLookupEnvReferenceScheme, 18 rows. Each row checks the returned value, user, password and error, the_KEYcache, andGet.go.mod,go.sum: no change againstmain. This branch first carried thegolang.org/x/netv0.60.0 bump. add policy actions for migrating and deleting builtin KMS keys #283 merged the same bump on 2026-10-15, and this branch now includesmain(2d98535), so neither file differs frommain.Motivation and Context
Fixes miniohq/aistor#8200. A plain value such as
envrootwas handled as a remote reference, rejected withinvalid argumentsbefore any request was sent, and came back empty. In MinIO AIStor:MINIO_ROOT_USER=envrootstopped the server withMissing credential environment variable, "MINIO_ROOT_USER".envmade the server start with the default credentials,minioadmin/minioadmin.The same applied to every setting read through
env.Get, not only root credentials.Behaviour changes for reviewers:
ENV://andEnv://values are now references. Before, they were plain values. URL schemes are case-insensitive (RFC 3986, section 3.1), andurl.Parsealready treatedenv+TLS://this way.env://orenv+tls://(for exampleenvs://orenv:/x) are now plain values.GetIntandGetDurationon anenv-prefixed plain value now return a parse error instead of the default. An upper-case reference that cannot be fetched and has no cached value now gives the default with no error, andIsSetfalse, where before the literal value gave a parse error andIsSettrue.How to test this PR?
Unit test:
End to end: build MinIO AIStor with
replace github.com/minio/pkg/v3 => <this branch>, start one node with four drives, and set the root credentials from the table below.Results, MinIO AIStor
edgeat8e8c1c8f0daa, single node, 4 drives. Both binaries come from the same source and toolchain (go1.26.9,make build); only theminio/pkgtree differs.03de1bc8b935(binary sha256049a2f3d...)5152e246...)envroot/plainsecret-1234FATAL ... Missing credential environment variable, "MINIO_ROOT_USER"envrootauthenticates;minioadminrejectedenvuser1/envpass12345minioadminauthenticates;envuser1rejectedenvuser1authenticates;minioadminrejectedrootenv/plainsecret-1234(control)rootenvauthenticatesrootenvauthenticatesenv://u:p@127.0.0.1:1/x(unreachable reference)env+TLS://u:p@127.0.0.1:1/x(unreachable reference)env://referencesenv.IsSetandenv.Gettreat a reference that cannot be fetched as unset)ENV://adminuser/plainsecret-1234ENV://adminuserauthenticates as a plain userThese end-to-end runs predate 99ac991, which restructures the
LookupEnvcondition after review without changing behaviour. The unit test and the mutation check were re-run on 99ac991, and both lookup-cost columns below were measured on one machine, at the base and at 99ac991.Unit level, same base and branch:
LookupEnv("envroot")"", errorinvalid arguments"envroot", no errorenv*row and the upper-case reference row), 7 passenvrootlookup cost://, any letter caseAlso run on this branch:
make lint: 0 issues.go vet,gofumpt -extra: clean.go test -race -tags kqueue ./..., plus thenoasm,puregoandnounsafetag sets: pass.-race, and the package 20 times with-shuffle=on -race: pass.mainsince add policy actions for migrating and deleting builtin KMS keys #283 merged (https://github.com/minio/pkg/actions/runs/38873731181).go mod verifyandmake test: pass.foundclause, thestrings.ToLowercall, each scheme comparison, the_KEYcache write, and theGetpath are each caught by a failing row. The value is lowercased only when it contains://, so a plain value is never copied; a mutant that lowercases every value passes every row and changes only the allocation count. Theunparsable referencerow must fail with aurl.EscapeErrorand open no connection to its own listener.Not run here: the Windows, macOS and arm CI lanes, and a multi-node cluster.
Types of changes
Checklist:
commit-idorPR #here)CI Workflow Labels
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minio/pkgruns its workflows on every pull request tomain, with no labels.Summary by CodeRabbit
env://andenv+tls://schemes regardless of letter case, while similar-looking values remain literal.