Hello, I installed a machine with these properties


           & sbuild (System (Debian Unstable) "i386") (Just proxy)
           & Sbuild.piupartsConfFor (System (Debian Unstable) "i386")
           & Sbuild.updatedFor (System (Debian Unstable) "i386") `period` Weekly (Just 1)
           & Sbuild.usableBy (User "picca")
           & Sbuild.shareAptCache

where 


    type Proxy = Maybe Url

    sbuild :: System -> Proxy -> RevertableProperty (HasInfo + Linux) Linux
    sbuild system@(System dist arch) proxy = Sbuild.builtFor system `before` setup
        where
          setup :: RevertableProperty (HasInfo + Linux) Linux
          setup = Chroot.provisioned chroot
          chroot = Chroot.debootstrapped Debootstrap.BuilddD chrootdir $ props
                   & os
                   & case proxy of
                       (Just p) -> "/etc/apt/apt.conf.d/01proxy" `File.hasContent` ["Acquire::http::Proxy \"" ++ p ++ "\";"]
                       Nothing -> doNothing
                   & Apt.installed ["apt-transport-https"]
                   & Apt.stdSourcesList
                   & Apt.update `onChange` Apt.upgrade
                   & Apt.cacheCleaned
          chrootdir :: FilePath
          chrootdir = "/srv/chroot" </>
                      case dist of
                        (Debian suite) -> Apt.showSuite suite ++ "-" ++ arch
                        (Buntish suite) -> suite ++ "-" ++ arch
          os = case dist of
                 (Debian suite) -> osDebian suite arch


But when I use it I get this error message


    i686-linux-gnu-gcc -pthread -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fno-strict-aliasing -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -fPIC -I/usr/lib/python2.7/dist-packages/numpy/core/include -I/«PKGBUILDDIR»/src -I/usr/include/python2.7 -c /«PKGBUILDDIR»/python/cython/_fisx.cpp -o build/temp.linux-i686-2.7/«PKGBUILDDIR»/python/cython/_fisx.o
    ccache: error: Failed to create directory /var/cache/ccache-sbuild/9/1: Permission denied
    error: command 'i686-linux-gnu-gcc' failed with exit status 1
    E: pybuild pybuild:274: build: plugin distutils failed with: exit code=1: /usr/bin/python setup.py build

    picca@ORD03037:~/Debian/python-fisx/python-fisx$ ls -l /var/cache/ccache-sbuild/
    total 76
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 0
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 1
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 2
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 3
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 4
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 5
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 6
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 7
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 8
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 9
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 a
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 b
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 c
    -rw-rw-r-- 1 picca instrumentation   16 juin  16 16:32 ccache.conf
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 d
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 e
    drwxr-xr-x 2 root  root            4096 juin  16 15:48 f
    -r-xr-xr-x 1 root  root             172 juin  16 15:48 sbuild-setup
    drwxrwxr-x 2 picca instrumentation 4096 juin  16 16:32 tmp


