pkg_add failing where prefix is a mount

[Filip Hajny <filip%joyent.com@localhost>]

Hi all,

I found a limitation in the mkdir_p implementation in add/perform.c of  
pkg_install (as of 2009Q1). This is on a slightly peculiar Solaris  
zone setup, where /usr is pushed read-only to sparse zones, and pkgsrc  
land is a ZFS file system mounted read-write at the /usr/local prefix.  
So while the zone can write to anything under /usr/local, it can't  
write /usr/local itself:

# mkdir /usr/local
mkdir: Failed to make directory "/usr/local"; Read-only file system
# mkdir /usr/local/test
#

pkg_add fails on any operation on the "if (mkdir_p(pkg- 
>install_prefix))" check. I'm sorry, I'm far from fluent in C, so not  
providing a patch here, but it would be nice to work around this case  
too (regardless of how rare it will be to encounter in the real world).

Regards,

--
Filip Hajny
Director, Accelerator Engineering
Joyent Inc.