panic with beginner's sketch.yaml #3081
Description
Describe the problem
In the first minutes of using sketch.yaml, without even knowing if the syntax is correct, arduino-cli panics.
% cat sketch.yaml
profiles:
garage:
fqbn: arduino:avr:uno
default_profile: garage
% arduino-cli compile
panic: runtime error: index out of range [0] with length 0
goroutine 1 [running]:
github.com/arduino/arduino-cli/internal/arduino/sketch.(*Profile).RequireSystemInstalledPlatform(...)
/home/runner/work/arduino-cli/arduino-cli/internal/arduino/sketch/profiles.go:127
github.com/arduino/arduino-cli/commands.(*arduinoCoreServerImpl).Init(0xc00000ec48, 0xc00038d040, {0x147ff40, 0xc00000f560})
/home/runner/work/arduino-cli/arduino-cli/commands/instances.go:253 +0x35ba
github.com/arduino/arduino-cli/internal/cli/instance.InitWithProfile({0x147ac88, 0xc0002fa1e0}, {0x148f6c8, 0xc00000ec48}, 0xc0003d4c60, {0xc000277950, 0x6}, 0xc0003c08e0)
/home/runner/work/arduino-cli/arduino-cli/internal/cli/instance/instance.go:80 +0x30b
github.com/arduino/arduino-cli/internal/cli/instance.CreateAndInitWithProfile({0x147ac88, 0xc0002fa1e0}, {0x148f6c8, 0xc00000ec48}, {0xc000277950, 0x6}, 0xc0003c08e0)
/home/runner/work/arduino-cli/arduino-cli/internal/cli/instance/instance.go:45 +0x115
github.com/arduino/arduino-cli/internal/cli/compile.runCompileCommand(0xc000398308, {0x1ce7ac0, 0x0, 0xe5d5bf9eb8329472?}, {0x148f6c8, 0xc00000ec48})
/home/runner/work/arduino-cli/arduino-cli/internal/cli/compile/compile.go:178 +0x328
github.com/arduino/arduino-cli/internal/cli/compile.NewCommand.func2(0xc000398308, {0x1ce7ac0, 0x0, 0x0})
/home/runner/work/arduino-cli/arduino-cli/internal/cli/compile/compile.go:96 +0x9e
github.com/spf13/cobra.(*Command).execute(0xc000398308, {0x1ce7ac0, 0x0, 0x0})
/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.10.2/command.go:1019 +0xa91
github.com/spf13/cobra.(*Command).ExecuteC(0xc00019e608)
/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.10.2/command.go:1148 +0x46f
github.com/spf13/cobra.(*Command).Execute(...)
/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.10.2/command.go:1071
github.com/spf13/cobra.(*Command).ExecuteContext(...)
/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.10.2/command.go:1064
main.main()
/home/runner/work/arduino-cli/arduino-cli/main.go:92 +0x468
To reproduce
$ cat <<EOF > sketch.yaml
garage:
fqbn: arduino:avr:uno
default_profile: garage
EOF
$ arduino-cli compile
Expected behavior
no panic whatever the content of sketch.yaml
Arduino CLI version
arduino-cli Version: nightly-20260119 Commit: 33cb387 Date: 2026-01-19T01:38:10Z
Operating system
Linux
Operating system version
Linux 6.18.5 / GNU libc 2.42
Additional context
Compiled with go 1.25.5 and 1.24.11: same result.
Issue checklist
- I searched for previous reports in the issue tracker
- I verified the problem still occurs when using the nightly build
- My report contains all necessary details