nomad cli panic runtime error if var file does not exist

[resmo]

Nomad version

Output from nomad version
Nomad v1.0.4 (9294f35)

Operating system and Environment details

WSL1 (Debian)

Issue

if the file -var-file does not exist, an panic runtime error is thrown.

Reproduction steps

nomad job plan -var-file=does-no-exist.hcl https://raw.githubusercontent.com/hashicorp/demo-nomad-101/master/lab-2/http-echo.nomad

Expected Result

Proper error message the var file does not exist

Actual Result

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x2799a3b]

goroutine 1 [running]:
github.com/hashicorp/nomad/jobspec2.(*jobConfig).collectInputVariableValues(0xc000969420, 0xc000050800, 0x1f, 0x1f, 0xc000216128, 0x1, 0x1, 0xc000581170, 0xc000837800, 0x2, ...)
        github.com/hashicorp/nomad/jobspec2/types.variables.go:548 +0x113b
github.com/hashicorp/nomad/jobspec2.(*jobConfig).decodeBody(0xc000969420, 0x3a4c740, 0xc000421080, 0xc000216120, 0x1, 0x1)
        github.com/hashicorp/nomad/jobspec2/types.config.go:66 +0x245
github.com/hashicorp/nomad/jobspec2.decode(0xc000969420, 0xc000969420, 0x34f6f55)
        github.com/hashicorp/nomad/jobspec2/parse.go:95 +0x258
github.com/hashicorp/nomad/jobspec2.ParseWithConfig(0xc0004209a0, 0xc0004209a0, 0x1f, 0xc0002160e0)
        github.com/hashicorp/nomad/jobspec2/parse.go:44 +0xa8
github.com/hashicorp/nomad/command.(*JobGetter).ApiJobWithArgs(0xc0003afc50, 0x7ffff1ddfa60, 0x57, 0x0, 0x0, 0x0, 0xc0004a9e60, 0x1, 0x1, 0x0, ...)
        github.com/hashicorp/nomad/command/helpers.go:455 +0x41f
github.com/hashicorp/nomad/command.(*JobPlanCommand).Run(0xc0003afba0, 0xc00004e0d0, 0x2, 0x2, 0xc0004a88c0)
        github.com/hashicorp/nomad/command/job_plan.go:145 +0x3e5
github.com/mitchellh/cli.(*CLI).Run(0xc000375540, 0xc000375540, 0xc000118880, 0x37)
        github.com/mitchellh/cli@v1.1.0/cli.go:260 +0x1cf
main.RunCustom(0xc00004e0b0, 0x4, 0x4, 0xc0000b2058)
        github.com/hashicorp/nomad/main.go:142 +0x4a5
main.Run(...)
        github.com/hashicorp/nomad/main.go:87
main.main()
        github.com/hashicorp/nomad/main.go:83 +0x65

Job file (if appropriate)

Nomad Server logs (if appropriate)

Nomad Client logs (if appropriate)

[drewbailey]

@resmo sorry you ran into this, thanks for reporting. We'll have a fix shortly

[drewbailey]

@resmo this has been fixed in #10569 and will be included in the next release cycle 1.1.0 beta/rc & 1.0.x backport

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