1 files changed, 0 insertions, 391 deletions
diff --git a/third_party/git/trace2/tr2_dst.c b/third_party/git/trace2/tr2_dst.c
deleted file mode 100644
index ae052a07fe2e..000000000000
--- a/third_party/git/trace2/tr2_dst.c
+++ /dev/null
@@ -1,391 +0,0 @@
-#include "cache.h"
-#include "trace2/tr2_dst.h"
-#include "trace2/tr2_sid.h"
-#include "trace2/tr2_sysenv.h"
-
-/*
- * How many attempts we will make at creating an automatically-named trace file.
- */
-#define MAX_AUTO_ATTEMPTS 10
-
-/*
- * Sentinel file used to detect when we should discard new traces to avoid
- * writing too many trace files to a directory.
- */
-#define DISCARD_SENTINEL_NAME "git-trace2-discard"
-
-/*
- * When set to zero, disables directory file count checks. Otherwise, controls
- * how many files we can write to a directory before entering discard mode.
- * This can be overridden via the TR2_SYSENV_MAX_FILES setting.
- */
-static int tr2env_max_files = 0;
-
-static int tr2_dst_want_warning(void)
-{
-	static int tr2env_dst_debug = -1;
-
-	if (tr2env_dst_debug == -1) {
-		const char *env_value = tr2_sysenv_get(TR2_SYSENV_DST_DEBUG);
-		if (!env_value || !*env_value)
-			tr2env_dst_debug = 0;
-		else
-			tr2env_dst_debug = atoi(env_value) > 0;
-	}
-
-	return tr2env_dst_debug;
-}
-
-void tr2_dst_trace_disable(struct tr2_dst *dst)
-{
-	if (dst->need_close)
-		close(dst->fd);
-	dst->fd = 0;
-	dst->initialized = 1;
-	dst->need_close = 0;
-}
-
-/*
- * Check to make sure we're not overloading the target directory with too many
- * files. First get the threshold (if present) from the config or envvar. If
- * it's zero or unset, disable this check. Next check for the presence of a
- * sentinel file, then check file count.
- *
- * Returns 0 if tracing should proceed as normal. Returns 1 if the sentinel file
- * already exists, which means tracing should be disabled. Returns -1 if there
- * are too many files but there was no sentinel file, which means we have
- * created and should write traces to the sentinel file.
- *
- * We expect that some trace processing system is gradually collecting files
- * from the target directory; after it removes the sentinel file we'll start
- * writing traces again.
- */
-static int tr2_dst_too_many_files(struct tr2_dst *dst, const char *tgt_prefix)
-{
-	int file_count = 0, max_files = 0, ret = 0;
-	const char *max_files_var;
-	DIR *dirp;
-	struct strbuf path = STRBUF_INIT, sentinel_path = STRBUF_INIT;
-	struct stat statbuf;
-
-	/* Get the config or envvar and decide if we should continue this check */
-	max_files_var = tr2_sysenv_get(TR2_SYSENV_MAX_FILES);
-	if (max_files_var && *max_files_var && ((max_files = atoi(max_files_var)) >= 0))
-		tr2env_max_files = max_files;
-
-	if (!tr2env_max_files) {
-		ret = 0;
-		goto cleanup;
-	}
-
-	strbuf_addstr(&path, tgt_prefix);
-	if (!is_dir_sep(path.buf[path.len - 1])) {
-		strbuf_addch(&path, '/');
-	}
-
-	/* check sentinel */
-	strbuf_addbuf(&sentinel_path, &path);
-	strbuf_addstr(&sentinel_path, DISCARD_SENTINEL_NAME);
-	if (!stat(sentinel_path.buf, &statbuf)) {
-		ret = 1;
-		goto cleanup;
-	}
-
-	/* check file count */
-	dirp = opendir(path.buf);
-	while (file_count < tr2env_max_files && dirp && readdir(dirp))
-		file_count++;
-	if (dirp)
-		closedir(dirp);
-
-	if (file_count >= tr2env_max_files) {
-		dst->too_many_files = 1;
-		dst->fd = open(sentinel_path.buf, O_WRONLY | O_CREAT | O_EXCL, 0666);
-		ret = -1;
-		goto cleanup;
-	}
-
-cleanup:
-	strbuf_release(&path);
-	strbuf_release(&sentinel_path);
-	return ret;
-}
-
-static int tr2_dst_try_auto_path(struct tr2_dst *dst, const char *tgt_prefix)
-{
-	int too_many_files;
-	const char *last_slash, *sid = tr2_sid_get();
-	struct strbuf path = STRBUF_INIT;
-	size_t base_path_len;
-	unsigned attempt_count;
-
-	last_slash = strrchr(sid, '/');
-	if (last_slash)
-		sid = last_slash + 1;
-
-	strbuf_addstr(&path, tgt_prefix);
-	if (!is_dir_sep(path.buf[path.len - 1]))
-		strbuf_addch(&path, '/');
-	strbuf_addstr(&path, sid);
-	base_path_len = path.len;
-
-	too_many_files = tr2_dst_too_many_files(dst, tgt_prefix);
-	if (!too_many_files) {
-		for (attempt_count = 0; attempt_count < MAX_AUTO_ATTEMPTS; attempt_count++) {
-			if (attempt_count > 0) {
-				strbuf_setlen(&path, base_path_len);
-				strbuf_addf(&path, ".%d", attempt_count);
-			}
-
-			dst->fd = open(path.buf, O_WRONLY | O_CREAT | O_EXCL, 0666);
-			if (dst->fd != -1)
-				break;
-		}
-	} else if (too_many_files == 1) {
-		strbuf_release(&path);
-		if (tr2_dst_want_warning())
-			warning("trace2: not opening %s trace file due to too "
-				"many files in target directory %s",
-				tr2_sysenv_display_name(dst->sysenv_var),
-				tgt_prefix);
-		return 0;
-	}
-
-	if (dst->fd == -1) {
-		if (tr2_dst_want_warning())
-			warning("trace2: could not open '%.*s' for '%s' tracing: %s",
-				(int) base_path_len, path.buf,
-				tr2_sysenv_display_name(dst->sysenv_var),
-				strerror(errno));
-
-		tr2_dst_trace_disable(dst);
-		strbuf_release(&path);
-		return 0;
-	}
-
-	strbuf_release(&path);
-
-	dst->need_close = 1;
-	dst->initialized = 1;
-
-	return dst->fd;
-}
-
-static int tr2_dst_try_path(struct tr2_dst *dst, const char *tgt_value)
-{
-	int fd = open(tgt_value, O_WRONLY | O_APPEND | O_CREAT, 0666);
-	if (fd == -1) {
-		if (tr2_dst_want_warning())
-			warning("trace2: could not open '%s' for '%s' tracing: %s",
-				tgt_value,
-				tr2_sysenv_display_name(dst->sysenv_var),
-				strerror(errno));
-
-		tr2_dst_trace_disable(dst);
-		return 0;
-	}
-
-	dst->fd = fd;
-	dst->need_close = 1;
-	dst->initialized = 1;
-
-	return dst->fd;
-}
-
-#ifndef NO_UNIX_SOCKETS
-#define PREFIX_AF_UNIX "af_unix:"
-#define PREFIX_AF_UNIX_STREAM "af_unix:stream:"
-#define PREFIX_AF_UNIX_DGRAM "af_unix:dgram:"
-
-static int tr2_dst_try_uds_connect(const char *path, int sock_type, int *out_fd)
-{
-	int fd;
-	struct sockaddr_un sa;
-
-	fd = socket(AF_UNIX, sock_type, 0);
-	if (fd == -1)
-		return errno;
-
-	sa.sun_family = AF_UNIX;
-	strlcpy(sa.sun_path, path, sizeof(sa.sun_path));
-
-	if (connect(fd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
-		int e = errno;
-		close(fd);
-		return e;
-	}
-
-	*out_fd = fd;
-	return 0;
-}
-
-#define TR2_DST_UDS_TRY_STREAM (1 << 0)
-#define TR2_DST_UDS_TRY_DGRAM  (1 << 1)
-
-static int tr2_dst_try_unix_domain_socket(struct tr2_dst *dst,
-					  const char *tgt_value)
-{
-	unsigned int uds_try = 0;
-	int fd;
-	int e;
-	const char *path = NULL;
-
-	/*
-	 * Allow "af_unix:[<type>:]<absolute_path>"
-	 *
-	 * Trace2 always writes complete individual messages (without
-	 * chunking), so we can talk to either DGRAM or STREAM type sockets.
-	 *
-	 * Allow the user to explicitly request the socket type.
-	 *
-	 * If they omit the socket type, try one and then the other.
-	 */
-
-	if (skip_prefix(tgt_value, PREFIX_AF_UNIX_STREAM, &path))
-		uds_try |= TR2_DST_UDS_TRY_STREAM;
-
-	else if (skip_prefix(tgt_value, PREFIX_AF_UNIX_DGRAM, &path))
-		uds_try |= TR2_DST_UDS_TRY_DGRAM;
-
-	else if (skip_prefix(tgt_value, PREFIX_AF_UNIX, &path))
-		uds_try |= TR2_DST_UDS_TRY_STREAM | TR2_DST_UDS_TRY_DGRAM;
-
-	if (!path || !*path) {
-		if (tr2_dst_want_warning())
-			warning("trace2: invalid AF_UNIX value '%s' for '%s' tracing",
-				tgt_value,
-				tr2_sysenv_display_name(dst->sysenv_var));
-
-		tr2_dst_trace_disable(dst);
-		return 0;
-	}
-
-	if (!is_absolute_path(path) ||
-	    strlen(path) >= sizeof(((struct sockaddr_un *)0)->sun_path)) {
-		if (tr2_dst_want_warning())
-			warning("trace2: invalid AF_UNIX path '%s' for '%s' tracing",
-				path, tr2_sysenv_display_name(dst->sysenv_var));
-
-		tr2_dst_trace_disable(dst);
-		return 0;
-	}
-
-	if (uds_try & TR2_DST_UDS_TRY_STREAM) {
-		e = tr2_dst_try_uds_connect(path, SOCK_STREAM, &fd);
-		if (!e)
-			goto connected;
-		if (e != EPROTOTYPE)
-			goto error;
-	}
-	if (uds_try & TR2_DST_UDS_TRY_DGRAM) {
-		e = tr2_dst_try_uds_connect(path, SOCK_DGRAM, &fd);
-		if (!e)
-			goto connected;
-	}
-
-error:
-	if (tr2_dst_want_warning())
-		warning("trace2: could not connect to socket '%s' for '%s' tracing: %s",
-			path, tr2_sysenv_display_name(dst->sysenv_var),
-			strerror(e));
-
-	tr2_dst_trace_disable(dst);
-	return 0;
-
-connected:
-	dst->fd = fd;
-	dst->need_close = 1;
-	dst->initialized = 1;
-
-	return dst->fd;
-}
-#endif
-
-static void tr2_dst_malformed_warning(struct tr2_dst *dst,
-				      const char *tgt_value)
-{
-	warning("trace2: unknown value for '%s': '%s'",
-		tr2_sysenv_display_name(dst->sysenv_var), tgt_value);
-}
-
-int tr2_dst_get_trace_fd(struct tr2_dst *dst)
-{
-	const char *tgt_value;
-
-	/* don't open twice */
-	if (dst->initialized)
-		return dst->fd;
-
-	dst->initialized = 1;
-
-	tgt_value = tr2_sysenv_get(dst->sysenv_var);
-
-	if (!tgt_value || !strcmp(tgt_value, "") || !strcmp(tgt_value, "0") ||
-	    !strcasecmp(tgt_value, "false")) {
-		dst->fd = 0;
-		return dst->fd;
-	}
-
-	if (!strcmp(tgt_value, "1") || !strcasecmp(tgt_value, "true")) {
-		dst->fd = STDERR_FILENO;
-		return dst->fd;
-	}
-
-	if (strlen(tgt_value) == 1 && isdigit(*tgt_value)) {
-		dst->fd = atoi(tgt_value);
-		return dst->fd;
-	}
-
-	if (is_absolute_path(tgt_value)) {
-		if (is_directory(tgt_value))
-			return tr2_dst_try_auto_path(dst, tgt_value);
-		else
-			return tr2_dst_try_path(dst, tgt_value);
-	}
-
-#ifndef NO_UNIX_SOCKETS
-	if (starts_with(tgt_value, PREFIX_AF_UNIX))
-		return tr2_dst_try_unix_domain_socket(dst, tgt_value);
-#endif
-
-	/* Always warn about malformed values. */
-	tr2_dst_malformed_warning(dst, tgt_value);
-	tr2_dst_trace_disable(dst);
-	return 0;
-}
-
-int tr2_dst_trace_want(struct tr2_dst *dst)
-{
-	return !!tr2_dst_get_trace_fd(dst);
-}
-
-void tr2_dst_write_line(struct tr2_dst *dst, struct strbuf *buf_line)
-{
-	int fd = tr2_dst_get_trace_fd(dst);
-
-	strbuf_complete_line(buf_line); /* ensure final NL on buffer */
-
-	/*
-	 * We do not use write_in_full() because we do not want
-	 * a short-write to try again.  We are using O_APPEND mode
-	 * files and the kernel handles the atomic seek+write. If
-	 * another thread or git process is concurrently writing to
-	 * this fd or file, our remainder-write may not be contiguous
-	 * with our initial write of this message.  And that will
-	 * confuse readers.  So just don't bother.
-	 *
-	 * It is assumed that TRACE2 messages are short enough that
-	 * the system can write them in 1 attempt and we won't see
-	 * a short-write.
-	 *
-	 * If we get an IO error, just close the trace dst.
-	 */
-	if (write(fd, buf_line->buf, buf_line->len) >= 0)
-		return;
-
-	if (tr2_dst_want_warning())
-		warning("unable to write trace to '%s': %s",
-			tr2_sysenv_display_name(dst->sysenv_var),
-			strerror(errno));
-	tr2_dst_trace_disable(dst);
-}