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cmd/go: go work use -r panics when given a directory that does not exist #51841

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notfilippo opened this issue Mar 21, 2022 · 6 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
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@notfilippo
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What version of Go are you using (go version)?

$ go version
go version go1.18 darwin/amd64

Does this issue reproduce with the latest release?

Yes.

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/rossi/Library/Caches/go-build"
GOENV="/Users/rossi/Library/Application Support/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOINSECURE=""
GOMODCACHE="/Users/rossi/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="darwin"
GOPATH="/Users/rossi/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/usr/local/Cellar/go/1.18/libexec"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.18/libexec/pkg/tool/darwin_amd64"
GOVCS=""
GOVERSION="go1.18"
GCCGO="gccgo"
GOAMD64="v1"
AR="ar"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD="/dev/null"
GOWORK="/Users/rossi/go.work"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -arch x86_64 -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/p0/53xvt8l57dj14b_pxf9dyyvw0000gn/T/go-build2599584196=/tmp/go-build -gno-record-gcc-switches -fno-common"

What did you do?

go work use -r does_not_exist

What did you expect to see?

An error message detailing that the directory does not exist.

What did you see instead?

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x141cdf5]

goroutine 1 [running]:
cmd/go/internal/workcmd.runUse.func2({0x7ff7bfeff8ff, 0xe}, {0x0, 0x0}, {0x5?, 0xc0000d3880?})
	/usr/local/Cellar/go/1.18/libexec/src/cmd/go/internal/workcmd/use.go:118 +0x35
cmd/go/internal/fsys.Walk({0x7ff7bfeff8ff, 0xe}, 0xc0000d39a8)
	/usr/local/Cellar/go/1.18/libexec/src/cmd/go/internal/fsys/fsys.go:441 +0x64
cmd/go/internal/workcmd.runUse({0x16dbd58?, 0xc00002a110?}, 0xc00002c528?, {0xc0000200e0, 0x1, 0x2?})
	/usr/local/Cellar/go/1.18/libexec/src/cmd/go/internal/workcmd/use.go:117 +0x97f
main.invoke(0x19be780, {0xc0000200c0, 0x3, 0x3})
	/usr/local/Cellar/go/1.18/libexec/src/cmd/go/main.go:218 +0x2ee
main.main()
	/usr/local/Cellar/go/1.18/libexec/src/cmd/go/main.go:175 +0x78e

Proposed solution

In go/src/cmd/go/internal/workcmd/use.go, starting from line 110.

+absArg, _ := pathRel(workDir, useDir)

+info, err := os.Stat(absArg)
+if err != nil {
+	if os.IsNotExist(err) {
+		base.Errorf("go: %v directory not found", absArg)
+	} else {
+		base.Errorf("go: %v", err)
+	}
+	continue
+} else if !info.IsDir() {
+	base.Errorf("go: %s not a directory", absArg)
+	continue
+}

if !*useR {
	  lookDir(useDir)
	  continue
}

// Add or remove entries for any subdirectories that still exist.

err = fsys.Walk(useDir, func(path string, info fs.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
	...
}

Happy to open a pull request if needed

@mvdan
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mvdan commented Mar 21, 2022

@notfilippo please just send a patch, just like #51749 (comment). Also note that issue, which is very similar, as the two patches might conflict.

@notfilippo notfilippo changed the title cmd/go: go work -r panics when given a directory that does not exist cmd/go: go work use -r panics when given a directory that does not exist Mar 21, 2022
notfilippo added a commit to notfilippo/go that referenced this issue Mar 21, 2022
Check if paths passed as arguments are existing directories.

Fixes golang#51841 golang#51749
@gopherbot
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Change https://go.dev/cl/394154 mentions this issue: cmd/go: prevent panic in go work use

notfilippo added a commit to notfilippo/go that referenced this issue Mar 21, 2022
Check if paths passed as arguments are existing directories.

Fixes golang#51841 golang#51749
@mknyszek mknyszek added the NeedsFix The path to resolution is known, but the work has not been done. label Mar 21, 2022
@mknyszek mknyszek added this to the Go1.19 milestone Mar 21, 2022
@mknyszek
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CC @matloob @bcmills

notfilippo added a commit to notfilippo/go that referenced this issue Mar 31, 2022
Check if paths passed as arguments are existing directories.

Fixes golang#51841 golang#51749
notfilippo added a commit to notfilippo/go that referenced this issue Apr 4, 2022
Check if paths passed as arguments are existing directories.

Fixes golang#51841
Fixes golang#51749
@bcmills
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bcmills commented Apr 4, 2022

@gopherbot, please backport to Go 1.18. This is a user-facing panic in a feature introduced in Go 1.18.

@gopherbot
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Backport issue(s) opened: #52140 (for 1.18).

Remember to create the cherry-pick CL(s) as soon as the patch is submitted to master, according to https://go.dev/wiki/MinorReleases.

@gopherbot
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Change https://go.dev/cl/397995 mentions this issue: [release-branch.go1.18] cmd/go: prevent panic in go work use

gopherbot pushed a commit that referenced this issue Apr 5, 2022
Check if paths passed as arguments are existing directories.

Fixes #52140
Updates #51841

Change-Id: Icfd148627e6f2c4651d6f923a37d413e68c67f6c
GitHub-Last-Rev: 77fffa7
GitHub-Pull-Request: #51845
Reviewed-on: https://go-review.googlesource.com/c/go/+/394154
Trust: Bryan Mills <bcmills@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Run-TryBot: Emmanuel Odeke <emmanuel@orijtech.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/go/+/397995
Run-TryBot: Bryan Mills <bcmills@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
@golang golang locked and limited conversation to collaborators Apr 4, 2023
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5 participants