map write: Operation not permitted

[ysangkok]

$ ./nix-user-chroot $HOME/nix-root bash
map write: Operation not permitted

This is the bottom of the strace output:

mkdir("/home/janus/nix-root/bin", 0755) = -1 EEXIST (File exists)
mount("/bin", "/home/janus/nix-root/bin", 0x40126b, MS_BIND|MS_REC, NULL) = 0
getdents(3, /* 0 entries */, 32768)     = 0
open("/proc/self/uid_map", O_WRONLY)    = 4
write(4, "1011 1011 1", 11)             = 11
close(4)                                = 0
open("/proc/self/gid_map", O_WRONLY)    = 4
write(4, "1011 1011 1", 11)             = -1 EPERM (Operation not permitted)
dup(2)                                  = 5
fcntl(5, F_GETFL)                       = 0x8002 (flags O_RDWR|O_LARGEFILE)
fstat(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 30), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc0725fc000
lseek(5, 0, SEEK_CUR)                   = -1 ESPIPE (Illegal seek)
write(5, "map write: Operation not permitt"..., 35map write: Operation not permitted
) = 35
close(5)                                = 0
munmap(0x7fc0725fc000, 4096)            = 0
exit_group(1)                           = ?
+++ exited with 1 +++

[lucabrunox]

Fixed by #5