hugo deploy: runtime error with empty section [[deployment.matchers]] #9220
Description
What version of Hugo are you using (hugo version)?
$ hugo version hugo v0.89.4-AB01BA6E+extended windows/amd64 BuildDate=2021-11-17T08:24:09Z VendorInfo=gohugoio
Does this issue reproduce with the latest release?
Yes.
How to reproduce:
Take an arbitrary hugo site and add the section below to the site's config.toml:
[deployment]
[[deployment.targets]]
name = "aws"
URL = "s3://www.your-domain.tld"
cloudFrontDistributionID = "E9RZ8T1EXAMPLEID"
[[deployment.matchers]]
#pattern = "^.+\\.(html|xml|json)$"
#gzip = true
If you now run hugo deploy, you end up with a runtime error:
hugo deploy
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x8 pc=0x253e54b]
goroutine 1 [running]:
github.com/gohugoio/hugo/deploy.decodeConfig({0x31df7b8, 0xc0001fda40})
/root/project/hugo/deploy/deployConfig.go:133 +0x26b
github.com/gohugoio/hugo/deploy.New({0x31df7b8, 0xc0001fda40}, {0x31dd6a0, 0xc00053be48})
/root/project/hugo/deploy/deploy.go:80 +0xc8
github.com/gohugoio/hugo/commands.(*commandsBuilder).newDeployCmd.func1(0xc000457900, {0x2c6a545, 0x2, 0x2})
/root/project/hugo/commands/deploy.go:67 +0xdc
github.com/spf13/cobra.(*Command).execute(0xc000457900, {0xc00055f5e0, 0x2, 0x2})
/go/pkg/mod/github.com/spf13/cobra@v1.2.1/command.go:856 +0x60e
github.com/spf13/cobra.(*Command).ExecuteC(0xc00040a000)
/go/pkg/mod/github.com/spf13/cobra@v1.2.1/command.go:974 +0x3bc
github.com/gohugoio/hugo/commands.Execute({0xc000050090, 0x3, 0x3})
/root/project/hugo/commands/hugo.go:92 +0xb4
main.main()
/root/project/hugo/main.go:23 +0x58
As soon as you uncomment the last two lines of the added section, everything works fine again.
Certainly a low priority issue, but I reckon having an empty [[deployment.matchers]] section could/should be handled more gracefully and hugo shouldn't choke on this.