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lxccontainer: create_partial()

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2018-02-24 15:10:33 +01:00
parent 444249ea2f
commit f5cd0252f7
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GPG Key ID: 8EB056D53EECB12D
1 changed files with 14 additions and 11 deletions
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25
src/lxc/lxccontainer.c
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@ -174,27 +174,30 @@ static int ongoing_create(struct lxc_container *c)
static int create_partial(struct lxc_container *c)
{
/* $lxcpath + '/' + $name + '/partial' + \0 */
int len = strlen(c->config_path) + strlen(c->name) + 10;
char *path = alloca(len);
int fd, ret;
size_t len;
char *path;
struct flock lk;
/* $lxcpath + '/' + $name + '/partial' + \0 */
len = strlen(c->config_path) + strlen(c->name) + 10;
path = alloca(len);
ret = snprintf(path, len, "%s/%s/partial", c->config_path, c->name);
if (ret < 0 || ret >= len) {
ERROR("Error writing partial pathname");
if (ret < 0 || (size_t)ret >= len)
return -1;
}
if ((fd=open(path, O_RDWR | O_CREAT | O_EXCL, 0755)) < 0) {
SYSERROR("Error creating partial file");
fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0755);
if (fd < 0)
return -1;
}
lk.l_type = F_WRLCK;
lk.l_whence = SEEK_SET;
lk.l_start = 0;
lk.l_len = 0;
if (fcntl(fd, F_SETLKW, &lk) < 0) {
SYSERROR("Error locking partial file %s", path);
ret = fcntl(fd, F_SETLKW, &lk);
if (ret < 0) {
SYSERROR("Failed to lock partial file %s", path);
close(fd);
return -1;
}