Re: Problem installing Guix on OpenVZ host that uses zfs

[Stefan Reichör]

Hi Leo,

> On Tue, Apr 11, 2017 at 10:07:30PM +0200, Stefan Reichör wrote:
>> Hi all,
>> 
>> I tried today to install Guix v12.0 on an OpenVZ hoster:
>> https://www.gnu.org/software/guix/manual/html_node/Binary-Installation.html#Binary-Installation
>> 
>> But I failed with the following problem:
>> 
>> ~/bin% ./guix package -i hello
>> The following package will be installed:
>>    hello        2.10    
>> /gnu/store/rvs42awwwby7pq3j0znglmz3vyznvbh1-hello-2.10
>> 
>> The following derivations will be built:
>>    /gnu/store/3rjlwl02c69c71jdcjcp96r41byqbv54-profile.drv
>>    /gnu/store/va7p6kn3c5836aw0risjxc0m6s3cj5jx-ca-certificate-bundle.drv
>>    /gnu/store/qbx513w8j5ikrjjnn2pv7qq91zmpylw8-fonts-dir.drv
>>    /gnu/store/9b7gxm83y7x4ps2mimp6jpfzx7hjypvd-info-dir.drv
>> guix package: error: build failed: while setting up the build environment: 
>> unable to make filesystem `/' private: Permission denied
>
> This comes from DerivationGoal() in 'nix/libstore/build.cc'.
>
> I'm not sure what it's trying to do with `/' and I'm also not familiar
> with that rather long function, so can you try attaching to the daemon
> with strace [0] and letting us know exactly where it fails?
>
> [0] Something like:
> $ strace -f -p $(pgrep guix-daemon | head -n1)

Cool trick :-)

Here is the part that triggers the problem as I assume (I can send the
full log as well when it is needed):

[pid 31032] open("/proc/self/mountinfo", O_RDONLY) = 17
[pid 31032] read(17, "2860 2854 0:102 / / rw,noatime m"..., 4096) = 4076
[pid 31032] read(17, "", 4096)          = 0
[pid 31032] close(17)                   = 0
[pid 31032] mount(NULL, "/", NULL, MS_PRIVATE, NULL) = -1 EACCES (Permission 
denied)
[pid 31032] futex(0x7f827449c190, FUTEX_WAKE_PRIVATE, 2147483647) = 0
[pid 31032] write(2, "while setting up the build envir"..., 97) = 97
[pid 31032] exit_group(1)               = ?
[pid 31028] close(16)                   = 0

The entry for "/" in /proc/self/mountinfo is:
3966 3548 0:102 / / rw,noatime master:129 - zfs 
satazpool/data/subvol-618-disk-1 rw,xattr,posixacl


Stefan.