I just updated arcanist and libphputil today and I can not use arcanist anymore as I am getting:
```
$ arc diff HEAD^
[2015-07-10 08:13:15] ERROR 2: is_link(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:821]
arcanist(), phutil()
#0 is_link(string) called at [<phutil>/src/filesystem/Filesystem.php:821]
#1 Filesystem::resolvePath(string) called at [<phutil>/src/filesystem/Filesystem.php:744]
#2 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#3 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#4 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
[2015-07-10 08:13:15] ERROR 2: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:828]
arcanist(), phutil()
#0 realpath(string) called at [<phutil>/src/filesystem/Filesystem.php:828]
#1 Filesystem::resolvePath(string) called at [<phutil>/src/filesystem/Filesystem.php:744]
#2 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#3 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#4 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
[2015-07-10 08:13:15] ERROR 2: realpath(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:845]
arcanist(), phutil()
#0 realpath(string) called at [<phutil>/src/filesystem/Filesystem.php:845]
#1 Filesystem::resolvePath(string) called at [<phutil>/src/filesystem/Filesystem.php:744]
#2 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#3 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#4 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
[2015-07-10 08:13:15] ERROR 2: is_link(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:749]
arcanist(), phutil()
#0 is_link(string) called at [<phutil>/src/filesystem/Filesystem.php:749]
#1 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#2 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#3 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
[2015-07-10 08:13:15] ERROR 2: file_exists(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:916]
arcanist(), phutil()
#0 file_exists(string) called at [<phutil>/src/filesystem/Filesystem.php:916]
#1 Filesystem::pathExists(string) called at [<phutil>/src/filesystem/Filesystem.php:1005]
#2 Filesystem::assertExists(string) called at [<phutil>/src/filesystem/Filesystem.php:869]
#3 Filesystem::isDescendant(string, string) called at [<phutil>/src/filesystem/Filesystem.php:761]
#4 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#5 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#6 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
[2015-07-10 08:13:15] ERROR 2: is_link(): open_basedir restriction in effect. File(/) is not within the allowed path(s): (/srv/http/:/home/:/tmp/:/usr/share/pear/:/usr/share/webapps/:/etc/:/usr/share/php/) at [/usr/share/php/libphutil/src/filesystem/Filesystem.php:916]
arcanist(), phutil()
#0 is_link(string) called at [<phutil>/src/filesystem/Filesystem.php:916]
#1 Filesystem::pathExists(string) called at [<phutil>/src/filesystem/Filesystem.php:1005]
#2 Filesystem::assertExists(string) called at [<phutil>/src/filesystem/Filesystem.php:869]
#3 Filesystem::isDescendant(string, string) called at [<phutil>/src/filesystem/Filesystem.php:761]
#4 Filesystem::walkToRoot(string) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:72]
#5 ArcanistWorkingCopyIdentity::newFromPathWithConfig(string, NULL) called at [<arcanist>/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php:22]
#6 ArcanistWorkingCopyIdentity::newFromPath(string) called at [<arcanist>/scripts/arcanist.php:113]
Usage Exception: `arc diff` is only supported under git, hg, svn.
```