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Diffstat (limited to 'trace.c')
-rw-r--r--trace.c55
1 files changed, 35 insertions, 20 deletions
diff --git a/trace.c b/trace.c
index 4aeea60973..7508aea028 100644
--- a/trace.c
+++ b/trace.c
@@ -25,15 +25,25 @@
#include "cache.h"
#include "quote.h"
+/*
+ * "Normalize" a key argument by converting NULL to our trace_default,
+ * and otherwise passing through the value. All caller-facing functions
+ * should normalize their inputs in this way, though most get it
+ * for free by calling get_trace_fd() (directly or indirectly).
+ */
+static void normalize_trace_key(struct trace_key **key)
+{
+ static struct trace_key trace_default = { "GIT_TRACE" };
+ if (!*key)
+ *key = &trace_default;
+}
+
/* Get a trace file descriptor from "key" env variable. */
static int get_trace_fd(struct trace_key *key)
{
- static struct trace_key trace_default = { "GIT_TRACE" };
const char *trace;
- /* use default "GIT_TRACE" if NULL */
- if (!key)
- key = &trace_default;
+ normalize_trace_key(&key);
/* don't open twice */
if (key->initialized)
@@ -51,22 +61,19 @@ static int get_trace_fd(struct trace_key *key)
else if (is_absolute_path(trace)) {
int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666);
if (fd == -1) {
- fprintf(stderr,
- "Could not open '%s' for tracing: %s\n"
- "Defaulting to tracing on stderr...\n",
+ warning("could not open '%s' for tracing: %s",
trace, strerror(errno));
- key->fd = STDERR_FILENO;
+ trace_disable(key);
} else {
key->fd = fd;
key->need_close = 1;
}
} else {
- fprintf(stderr, "What does '%s' for %s mean?\n"
- "If you want to trace into a file, then please set "
- "%s to an absolute pathname (starting with /).\n"
- "Defaulting to tracing on stderr...\n",
- trace, key->key, key->key);
- key->fd = STDERR_FILENO;
+ warning("unknown trace value for '%s': %s\n"
+ " If you want to trace into a file, then please set %s\n"
+ " to an absolute pathname (starting with /)",
+ key->key, trace, key->key);
+ trace_disable(key);
}
key->initialized = 1;
@@ -75,6 +82,8 @@ static int get_trace_fd(struct trace_key *key)
void trace_disable(struct trace_key *key)
{
+ normalize_trace_key(&key);
+
if (key->need_close)
close(key->fd);
key->fd = 0;
@@ -82,9 +91,6 @@ void trace_disable(struct trace_key *key)
key->need_close = 0;
}
-static const char err_msg[] = "Could not trace into fd given by "
- "GIT_TRACE environment variable";
-
static int prepare_trace_line(const char *file, int line,
struct trace_key *key, struct strbuf *buf)
{
@@ -120,18 +126,27 @@ static int prepare_trace_line(const char *file, int line,
return 1;
}
+static void trace_write(struct trace_key *key, const void *buf, unsigned len)
+{
+ if (write_in_full(get_trace_fd(key), buf, len) < 0) {
+ normalize_trace_key(&key);
+ warning("unable to write trace for %s: %s",
+ key->key, strerror(errno));
+ trace_disable(key);
+ }
+}
+
void trace_verbatim(struct trace_key *key, const void *buf, unsigned len)
{
if (!trace_want(key))
return;
- write_or_whine_pipe(get_trace_fd(key), buf, len, err_msg);
+ trace_write(key, buf, len);
}
static void print_trace_line(struct trace_key *key, struct strbuf *buf)
{
strbuf_complete_line(buf);
-
- write_or_whine_pipe(get_trace_fd(key), buf->buf, buf->len, err_msg);
+ trace_write(key, buf->buf, buf->len);
strbuf_release(buf);
}