+#################### should go into a separate libvirtsystemd.py
+# but we want to keep packaging simple for now
+
+# reproducing libvirt's systemd-oriented escaping mechanism
+# http://code.metager.de/source/xref/lib/virt/src/util/virsystemd.c
+# (see original code at the end of this file)
+
+def virSystemdEscapeName (name):
+ result=''
+ def ESCAPE(c,s):
+ # replace hex's output '0x..' into '\x..'
+ return s+hex(ord(c)).replace('0','\\',1)
+ VALID_CHARS = \
+ "0123456789" + \
+ "abcdefghijklmnopqrstuvwxyz" + \
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ" + \
+ ":-_.\\"
+ for c in name:
+ if c=='/':
+ result += '-'
+ elif c in '-\\' or c not in VALID_CHARS:
+ result=ESCAPE(c,result)
+ else:
+ result += c
+ return result
+
+#35static void virSystemdEscapeName(virBufferPtr buf,
+#36 const char *name)
+#37{
+#38 static const char hextable[16] = "0123456789abcdef";
+#39
+#40#define ESCAPE(c) \
+#41 do { \
+#42 virBufferAddChar(buf, '\\'); \
+#43 virBufferAddChar(buf, 'x'); \
+#44 virBufferAddChar(buf, hextable[(c >> 4) & 15]); \
+#45 virBufferAddChar(buf, hextable[c & 15]); \
+#46 } while (0)
+#47
+#48#define VALID_CHARS \
+#49 "0123456789" \
+#50 "abcdefghijklmnopqrstuvwxyz" \
+#51 "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \
+#52 ":-_.\\"
+#53
+#54 if (*name == '.') {
+#55 ESCAPE(*name);
+#56 name++;
+#57 }
+#58
+#59 while (*name) {
+#60 if (*name == '/')
+#61 virBufferAddChar(buf, '-');
+#62 else if (*name == '-' ||
+#63 *name == '\\' ||
+#64 !strchr(VALID_CHARS, *name))
+#65 ESCAPE(*name);
+#66 else
+#67 virBufferAddChar(buf, *name);
+#68 name++;
+#69 }
+#70
+#71#undef ESCAPE
+#72#undef VALID_CHARS
+#73}
+
+def virSystemdMakeScopeName (name, drivername, partition):
+ result=''
+ result += virSystemdEscapeName (partition)
+ result += '-'
+ result += virSystemdEscapeName (drivername)
+ result += '\\x2d'
+ result += virSystemdEscapeName (name)
+ result += '.scope'
+ return result
+
+#76char *virSystemdMakeScopeName(const char *name,
+#77 const char *drivername,
+#78 const char *partition)
+#79{
+#80 virBuffer buf = VIR_BUFFER_INITIALIZER;
+#81
+#82 if (*partition == '/')
+#83 partition++;
+#84
+#85 virSystemdEscapeName(&buf, partition);
+#86 virBufferAddChar(&buf, '-');
+#87 virSystemdEscapeName(&buf, drivername);
+#88 virBufferAddLit(&buf, "\\x2d");
+#89 virSystemdEscapeName(&buf, name);
+#90 virBufferAddLit(&buf, ".scope");
+#91
+#92 if (virBufferError(&buf)) {
+#93 virReportOOMError();
+#94 return NULL;
+#95 }
+#96
+#97 return virBufferContentAndReset(&buf);
+#98}
+
+### our own additions
+import os.path
+def find_first_dir (candidates):
+ for candidate in candidates:
+ if os.path.isdir(candidate): return candidate
+ raise Exception,"Cannot find valid dir among %s"%'\n'.join(candidates)
+
+def find_sysfs_scope (subsystem, slice_name):
+ subsystem1=subsystem
+ subsystem2=subsystem
+ if subsystem=='cpuacct':
+ subsystem2='cpu,cpuacct'
+ candidates = [
+ # for f16 and our locally brewed libvirt 1.0.4
+ "/sys/fs/cgroup/%s/libvirt/lxc/%s"%(subsystem1, slice_name),
+ # f20 and libvirt 1.1.3
+ "/sys/fs/cgroup/%s/machine.slice/%s"%(subsystem2,
+ virSystemdMakeScopeName(slice_name,'lxc','machine')),
+ ]
+ return find_first_dir (candidates)
+
+#################### end of libvirtsystemd.py
+