Look for required tools in $PATH instead of just a handful locations.

diff --git a/src/ceph-volume/ceph_volume/util/system.py b/src/ceph-volume/ceph_volume/util/system.py
index b637f023a4..14516e1c65 100644
--- a/src/ceph-volume/ceph_volume/util/system.py
+++ b/src/ceph-volume/ceph_volume/util/system.py
@@ -33,14 +33,7 @@ def generate_uuid():
 
 def which(executable):
     """find the location of an executable"""
-    locations = (
-        '/usr/local/bin',
-        '/bin',
-        '/usr/bin',
-        '/usr/local/sbin',
-        '/usr/sbin',
-        '/sbin',
-    )
+    locations = os.getenv('PATH').split(':')
 
     for location in locations:
         executable_path = os.path.join(location, executable)
;'>
<option value='koszko' selected='selected'>koszko</option>
<option value='koszko-scripts'>koszko-scripts</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/guix/about/'>about</a><a href='/guix/'>summary</a><a href='/guix/refs/?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>refs</a><a href='/guix/log/gnu/packages/cups.scm'>log</a><a href='/guix/tree/gnu/packages/cups.scm?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>tree</a><a href='/guix/commit/gnu/packages/cups.scm?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>commit</a><a class='active' href='/guix/diff/gnu/packages/cups.scm?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/gnu/packages/cups.scm'>
<input type='hidden' name='id' value='8080c03d14ccdd7897a902966ea4aeea8dbfd359'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/guix/diff/?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>root</a>/<a href='/guix/diff/gnu?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>gnu</a>/<a href='/guix/diff/gnu/packages?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>packages</a>/<a href='/guix/diff/gnu/packages/cups.scm?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>cups.scm</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='8080c03d14ccdd7897a902966ea4aeea8dbfd359'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><div class='diffstat-header'><a href='/guix/diff/?id=8080c03d14ccdd7897a902966ea4aeea8dbfd359'>Diffstat</a> (limited to 'gnu/packages/cups.scm')</div><table summary='diffstat' class='diffstat'></table><div class='diffstat-summary'>0 files changed, 0 insertions, 0 deletions</div><table summary='diff' class='diff'><tr><td></td></tr></table></div> <!-- class=content -->
                         <div class=footer>generated by
                             <a href="https://git.zx2c4.com/cgit/about/">
                                 cgit
                             </a>
                         </div>
                        </div> <!-- id=cgit -->
</body>
</html>