just trying this out from OSX.
Setcaps is not available, and it might be why the update to the SD card was refused ?
x-MacBook-Pro:bin apple$ diskutil list
/dev/disk0 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *251.0 GB disk0
1: EFI EFI 209.7 MB disk0s1
2: Apple_CoreStorage Ohne Titel 250.1 GB disk0s2
3: Apple_Boot Recovery HD 650.0 MB disk0s3
/dev/disk1 (internal, virtual):
#: TYPE NAME SIZE IDENTIFIER
0: Apple_HFS Ohne Titel +249.8 GB disk1
Logical Volume on disk0s2
3877FA65-5A90-469F-B4AD-0D12C262693B
Unencrypted
/dev/disk2 (internal, physical):
#: TYPE NAME SIZE IDENTIFIER
0: FDisk_partition_scheme *15.9 GB disk2
1: Windows_FAT_16 RECOVERY 1.3 GB disk2s1
2: Linux 33.6 MB disk2s5
3: Windows_FAT_32 boot 69.2 MB disk2s6
4: Linux 14.6 GB disk2s7
x-MacBook-Pro:bin apple$ sudo setcap
Password:
sudo: setcap: command not found
x-MacBook-Pro:bin apple$ sudo setcap
sudo: setcap: command not found
x-MacBook-Pro:bin apple$ go get github.com/gokrazy/hello
x-MacBook-Pro:bin apple$ gokr-packer -overwrite=/dev/disk2 github.com/gokrazy/hello
2017/05/01 17:05:17 packer.go:225: installing [github.com/gokrazy/hello]
2017/05/01 17:05:18 gotool.go:60: getting incomplete packages [github.com/gokrazy/gokrazy/cmd/dhcp github.com/gokrazy/gokrazy/cmd/ntp]
2017/05/01 17:05:34 packer.go:123: partitioning /dev/disk2
2017/05/01 17:05:34 packer.go:285: open /dev/disk2: permission denied