Re: [libvirt] [PATCH 1/4] Add APIs for formatting systemd slice/scope names

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; There are some interesting escaping rules to consider when dealing with systemd slice/scope names. Thus it is helpful to have APIs for formatting names Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- src/libvirt_private.syms | 2 ++ src/util/virsystemd.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++-- src/util/virsystemd.h | 5 +++ tests/virsystemdtest.c | 48 +++++++++++++++++++++++++ 4 files changed, 144 insertions(+), 2 deletions(-) diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index d9615ea..0247a46 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -1935,6 +1935,8 @@ virSysinfoSetup; # util/virsystemd.h virSystemdCreateMachine; +virSystemdMakeScopeName; +virSystemdMakeSliceName; # util/virthread.h diff --git a/src/util/virsystemd.c b/src/util/virsystemd.c index 11d1153..251b846 100644 --- a/src/util/virsystemd.c +++ b/src/util/virsystemd.c @@ -27,9 +27,96 @@ #include "viralloc.h" #include "virutil.h" #include "virlog.h" +#include "virerror.h" #define VIR_FROM_THIS VIR_FROM_SYSTEMD + +static void virSystemdEscapeName(virBufferPtr buf, + const char *name) +{ + static const char hextable[16] = "0123456789abcdef"; + +#define ESCAPE(c) \ + do { \ + virBufferAddChar(buf, '\\'); \ + virBufferAddChar(buf, 'x'); \ + virBufferAddChar(buf, hextable[(c >> 4) & 15]); \ + virBufferAddChar(buf, hextable[c & 15]); \ + } while (0) + +#define VALID_CHARS \ + "0123456789" \ + "abcdefghijklmnopqrstuvwxyz" \ + "ABCDEFGHIJKLMNOPQRSTUVWXYZ" \ + ":-_.\\" + + if (*name == '.') { + ESCAPE(*name); + name++; + } + + while (*name) { + if (*name == '/') + virBufferAddChar(buf, '-'); + else if (*name == '-' || + *name == '\\' || + !strchr(VALID_CHARS, *name)) + ESCAPE(*name); + else + virBufferAddChar(buf, *name); + name++; + } + +#undef ESCAPE +#undef VALID_CHARS +} + + +char *virSystemdMakeScopeName(const char *name, + const char *drivername, + const char *partition) +{ + virBuffer buf = VIR_BUFFER_INITIALIZER; + + if (*partition == '/') + partition++; + + virSystemdEscapeName(&buf, partition); + virBufferAddChar(&buf, '-'); + virSystemdEscapeName(&buf, drivername); + virBufferAddLit(&buf, "\\x2d");