[PATCH 4/4] tools: hv: Parse /etc/os-release

["K. Y. Srinivasan" <kys@microsoft.com>]

There is a new convention, used by systemd and supported by most
distributions, to put basic OS release information in /etc/os-release.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Cc: stable@vger.kernel.org
---
 tools/hv/hv_kvp_daemon.c |   50 +++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/tools/hv/hv_kvp_daemon.c b/tools/hv/hv_kvp_daemon.c
index 3922abc..77a8413 100644
--- a/tools/hv/hv_kvp_daemon.c
+++ b/tools/hv/hv_kvp_daemon.c
@@ -465,15 +465,59 @@ void kvp_get_os_info(void)
 	if (p)
 		*p = '\0';
 
+	/*
+	 * Parse the /etc/os-release file if present:
+	 * http://www.freedesktop.org/software/systemd/man/os-release.html
+	 */
+	file = fopen("/etc/os-release", "r");
+	if (file != NULL) {
+		while (fgets(buf, sizeof(buf), file)) {
+			char *value, *q;
+
+			/* Ignore comments */
+			if (buf[0] == '#')
+				continue;
+
+			/* Split into name=value */
+			p = strchr(buf, '=');
+			if (!p)
+				continue;
+			*p++ = 0;
+
+			/* Remove quotes and newline; un-escape */
+			value = p;
+			q = p;
+			while (*p) {
+				if (*p == '\\') {
+					++p;
+					if (!*p)
+						break;
+					*q++ = *p++;
+				} else if (*p == '\'' || *p == '"' ||
+					   *p == '\n') {
+					++p;
+				} else {
+					*q++ = *p++;
+				}
+			}
+			*q = 0;
+
+			if (!strcmp(buf, "NAME"))
+				os_name = strdup(value);
+			else if (!strcmp(buf, "VERSION_ID"))
+				os_major = strdup(value);
+		}
+		fclose(file);
+		return;
+	}
+
+	/* Fallback for older RH/SUSE releases */
 	file = fopen("/etc/SuSE-release", "r");
 	if (file != NULL)
 		goto kvp_osinfo_found;
 	file  = fopen("/etc/redhat-release", "r");
 	if (file != NULL)
 		goto kvp_osinfo_found;
-	/*
-	 * Add code for other supported platforms.
-	 */
 
 	/*
 	 * We don't have information about the os.
-- 
1.7.4.1