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console: dump ringbuffer to disk on container exit

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The console ringbuffer will be dumped to disk if the console log file is not
rotated and it's size is not unlimited. In the former two cases we will have
all data from the ringbuffer available anyway.

Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-02-15 18:55:58 +01:00
parent 23e0d9af76
commit 39c6cdb771
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 43 additions and 0 deletions
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43
src/lxc/console.c
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@ -705,10 +705,53 @@ out:
return ret;
}
int lxc_console_write_ringbuffer(struct lxc_console *console)
{
char *r_addr;
ssize_t ret;
uint64_t used;
struct lxc_ringbuf *buf = &console->ringbuf;
/* There's not log file where we can dump the ringbuffer to. */
if (console->log_fd < 0)
return 0;
/* The log file is simply appended to. */
if (console->log_size == 0)
return 0;
/* The log file is rotated. */
if (console->log_rotate == 0)
return 0;
used = lxc_ringbuf_used(buf);
if (used == 0)
return 0;
ret = lxc_console_truncate_log_file(console);
if (ret < 0)
return ret;
/* Write as much as we can without exceeding the limit. */
if (console->log_size < used)
used = console->log_size;
r_addr = lxc_ringbuf_get_read_addr(buf);
ret = lxc_write_nointr(console->log_fd, r_addr, used);
if (ret < 0)
return -EIO;
return 0;
}
void lxc_console_delete(struct lxc_console *console)
{
int ret;
ret = lxc_console_write_ringbuffer(console);
if (ret < 0)
WARN("Failed to write console ringbuffer to console log file");
if (console->tios && console->peer >= 0) {
ret = tcsetattr(console->peer, TCSAFLUSH, console->tios);
if (ret < 0)