[Issue] panic when received SIGINT

[qiuchengxuan]

Current Behavior

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x118 pc=0x7ccdd2]

goroutine 1 [running]:
github.com/regclient/regclient/types/blob.(*BReader).Close(0xc0003b0df0?)
        github.com/regclient/regclient/types/blob/reader.go:85 +0x12
github.com/regclient/regclient/mod.Apply.func3.1()
        github.com/regclient/regclient/mod/mod.go:121 +0x24
github.com/regclient/regclient/mod.Apply.func3(0xc0004c6c00)
        github.com/regclient/regclient/mod/mod.go:136 +0x374
github.com/regclient/regclient/mod.dagWalkLayers(0xc00037ac60, 0xc0003b1408)
        github.com/regclient/regclient/mod/dag.go:509 +0x92
github.com/regclient/regclient/mod.dagWalkLayers(0xc000446420, 0xc0003b1408)
        github.com/regclient/regclient/mod/dag.go:498 +0x137
github.com/regclient/regclient/mod.Apply({0xa9a778, 0xc0000b04b0}, _, {{0x9a957b, 0x3}, {0x7ffcff334c3d, 0x15}, {0x9aaf58, 0x9}, {0x7ffcff334c3d, ...}, ...}, ...)
        github.com/regclient/regclient/mod/mod.go:117 +0x750
main.(*imageCmd).runImageMod(0xc00033a160, 0xc000360608, {0xc00031e150?, 0x0?, 0x0?})
        github.com/regclient/regclient/cmd/regctl/image.go:1651 +0x77f
github.com/spf13/cobra.(*Command).execute(0xc000360608, {0xc00031e0e0, 0x7, 0x7})
        github.com/spf13/cobra@v1.8.0/command.go:983 +0xaca
github.com/spf13/cobra.(*Command).ExecuteC(0xc000320008)
        github.com/spf13/cobra@v1.8.0/command.go:1115 +0x3ff
github.com/spf13/cobra.(*Command).Execute(...)
        github.com/spf13/cobra@v1.8.0/command.go:1039
github.com/spf13/cobra.(*Command).ExecuteContext(...)
        github.com/spf13/cobra@v1.8.0/command.go:1032
main.main()
        github.com/regclient/regclient/cmd/regctl/main.go:29 +0x14e

Expected Behavior

Won't panic

Steps To Reproduce

1. regctl -v error image mod fluent/fluent-bit:1.8 --layer-compress none --create ocidir://fluent-bit:1.8
2. Press control+c

Version

VCSTag:     v0.6.1
VCSRef:     766ee6291f882778207ff42207f9ca8b1da54e57
VCSCommit:  766ee6291f882778207ff42207f9ca8b1da54e57
VCSState:   clean
VCSDate:    2024-05-14T13:18:19Z
Platform:   linux/amd64
GoVer:      go1.22.3
GoCompiler: gc

Environment

• Running as binary or container: binary
• Host platform: linux/amd64
• Registry description: dockerhub

Anything else

nope

[Brandon Mitchell]

Thank you for the report! This should be resolved by #746.