1 files changed, 103 insertions, 0 deletions
diff --git a/version.c b/version.c
new file mode 100644
index 0000000000..279269cc50
--- /dev/null
+++ b/version.c
@@ -0,0 +1,103 @@
+#define USE_THE_REPOSITORY_VARIABLE
+
+#include "git-compat-util.h"
+#include "version.h"
+#include "strbuf.h"
+#include "gettext.h"
+
+#ifndef GIT_VERSION_H
+# include "version-def.h"
+#else
+# include GIT_VERSION_H
+#endif
+
+const char git_version_string[] = GIT_VERSION;
+const char git_built_from_commit_string[] = GIT_BUILT_FROM_COMMIT;
+
+/*
+ * Trim and replace each character with ascii code below 32 or above
+ * 127 (included) using a dot '.' character.
+ */
+static void redact_non_printables(struct strbuf *buf)
+{
+	strbuf_trim(buf);
+	for (size_t i = 0; i < buf->len; i++) {
+		if (!isprint(buf->buf[i]) || buf->buf[i] == ' ')
+			buf->buf[i] = '.';
+	}
+}
+
+const char *git_user_agent(void)
+{
+	static const char *agent = NULL;
+
+	if (!agent) {
+		agent = getenv("GIT_USER_AGENT");
+		if (!agent)
+			agent = GIT_USER_AGENT;
+	}
+
+	return agent;
+}
+
+/*
+  Retrieve, sanitize and cache operating system info for subsequent
+  calls. Return a pointer to the sanitized operating system info
+  string.
+*/
+static const char *os_info(void)
+{
+	static const char *os = NULL;
+
+	if (!os) {
+		struct strbuf buf = STRBUF_INIT;
+
+		get_uname_info(&buf, 0);
+		/* Sanitize the os information immediately */
+		redact_non_printables(&buf);
+		os = strbuf_detach(&buf, NULL);
+	}
+
+	return os;
+}
+
+const char *git_user_agent_sanitized(void)
+{
+	static const char *agent = NULL;
+
+	if (!agent) {
+		struct strbuf buf = STRBUF_INIT;
+
+		strbuf_addstr(&buf, git_user_agent());
+
+		if (!getenv("GIT_USER_AGENT")) {
+			strbuf_addch(&buf, '-');
+			strbuf_addstr(&buf, os_info());
+		}
+		redact_non_printables(&buf);
+		agent = strbuf_detach(&buf, NULL);
+	}
+
+	return agent;
+}
+
+int get_uname_info(struct strbuf *buf, unsigned int full)
+{
+	struct utsname uname_info;
+
+	if (uname(&uname_info)) {
+		strbuf_addf(buf, _("uname() failed with error '%s' (%d)\n"),
+			    strerror(errno),
+			    errno);
+		return -1;
+	}
+	if (full)
+		strbuf_addf(buf, "%s %s %s %s\n",
+			    uname_info.sysname,
+			    uname_info.release,
+			    uname_info.version,
+			    uname_info.machine);
+	else
+	     strbuf_addf(buf, "%s\n", uname_info.sysname);
+	return 0;
+}