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-rw-r--r--src/coredump/coredumpctl.c66
1 files changed, 43 insertions, 23 deletions
diff --git a/src/coredump/coredumpctl.c b/src/coredump/coredumpctl.c
index a408adf169..0e5351e621 100644
--- a/src/coredump/coredumpctl.c
+++ b/src/coredump/coredumpctl.c
@@ -617,26 +617,34 @@ static int dump_list(sd_journal *j) {
return 0;
}
-static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
+static int save_core(sd_journal *j, FILE *file, char **path, bool *unlink_temp) {
const char *data;
_cleanup_free_ char *filename = NULL;
size_t len;
- int r;
+ int r, fd;
_cleanup_close_ int fdt = -1;
char *temp = NULL;
- assert((fd >= 0) != !!path);
- assert(!!path == !!unlink_temp);
-
- /* We want full data, nothing truncated. */
- sd_journal_set_data_threshold(j, 0);
+ assert(!(file && path)); /* At most one can be specified */
+ assert(!!path == !!unlink_temp); /* Those must be specified together */
/* Look for a coredump on disk first. */
r = sd_journal_get_data(j, "COREDUMP_FILENAME", (const void**) &data, &len);
- if (r < 0 && r != -ENOENT)
- return log_error_errno(r, "Failed to retrieve COREDUMP_FILENAME: %m");
- else if (r == 0)
+ if (r == 0)
retrieve(data, len, "COREDUMP_FILENAME", &filename);
+ else {
+ if (r != -ENOENT)
+ return log_error_errno(r, "Failed to retrieve COREDUMP_FILENAME field: %m");
+ /* Check that we can have a COREDUMP field. We still haven't set a high
+ * data threshold, so we'll get a few kilobytes at most.
+ */
+
+ r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
+ if (r == -ENOENT)
+ return log_error_errno(r, "Coredump entry has no core attached (neither internally in the journal nor externally on disk).");
+ if (r < 0)
+ return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
+ }
if (filename) {
if (access(filename, R_OK) < 0)
@@ -650,7 +658,7 @@ static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
}
}
- if (fd < 0) {
+ if (path) {
const char *vt;
/* Create a temporary file to write the uncompressed core to. */
@@ -669,6 +677,22 @@ static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
log_debug("Created temporary file %s", temp);
fd = fdt;
+ } else {
+ /* If neither path or file are specified, we will write to stdout. Let's now check
+ * if stdout is connected to a tty. We checked that the file exists, or that the
+ * core might be stored in the journal. In this second case, if we found the entry,
+ * in all likelyhood we will be able to access the COREDUMP= field. In either case,
+ * we stop before doing any "real" work, i.e. before starting decompression or
+ * reading from the file or creating temporary files.
+ */
+ if (!file) {
+ if (on_tty())
+ return log_error_errno(ENOTTY, "Refusing to dump core to tty"
+ " (use shell redirection or specify --output).");
+ file = stdout;
+ }
+
+ fd = fileno(file);
}
if (filename) {
@@ -694,11 +718,12 @@ static int save_core(sd_journal *j, int fd, char **path, bool *unlink_temp) {
} else {
ssize_t sz;
+ /* We want full data, nothing truncated. */
+ sd_journal_set_data_threshold(j, 0);
+
r = sd_journal_get_data(j, "COREDUMP", (const void**) &data, &len);
if (r < 0)
- return log_error_errno(r,
- r == -ENOENT ? "Core file was not saved for this entry." :
- "Failed to retrieve COREDUMP field: %m");
+ return log_error_errno(r, "Failed to retrieve COREDUMP field: %m");
assert(len >= 9);
data += 9;
@@ -741,14 +766,9 @@ static int dump_core(sd_journal* j) {
print_info(arg_output ? stdout : stderr, j, false);
- if (on_tty() && !arg_output) {
- log_error("Refusing to dump core to tty.");
- return -ENOTTY;
- }
-
- r = save_core(j, arg_output ? fileno(arg_output) : STDOUT_FILENO, NULL, NULL);
+ r = save_core(j, arg_output, NULL, NULL);
if (r < 0)
- return log_error_errno(r, "Coredump retrieval failed: %m");
+ return r;
r = sd_journal_previous(j);
if (r > 0)
@@ -797,9 +817,9 @@ static int run_gdb(sd_journal *j) {
return -ENOENT;
}
- r = save_core(j, -1, &path, &unlink_path);
+ r = save_core(j, NULL, &path, &unlink_path);
if (r < 0)
- return log_error_errno(r, "Failed to retrieve core: %m");
+ return r;
pid = fork();
if (pid < 0) {