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lxccontainer: improve do_lxcapi_save_config()

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Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
This commit is contained in:
Christian Brauner 2022-01-18 16:57:47 +01:00
parent e5af72a666
commit 78ffe01108
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 20 additions and 18 deletions
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38
src/lxc/lxccontainer.c
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@ -2605,28 +2605,26 @@ WRAP_API_3(int, lxcapi_get_keys, const char *, char *, int)
static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file)
{
int fd, lret;
bool ret = false, need_disklock = false;
__do_close int fd_config = -EBADF;
int lret = -1;
bool bret = false, need_disklock = false;
if (!alt_file)
alt_file = c->configfile;
if (!alt_file)
return false;
return log_error(false, "No config file found");
/* If we haven't yet loaded a config, load the stock config. */
if (!c->lxc_conf) {
if (!do_lxcapi_load_config(c, lxc_global_config_value("lxc.default_config"))) {
ERROR("Error loading default configuration file %s "
"while saving %s",
lxc_global_config_value("lxc.default_config"),
c->name);
return false;
return log_error(false, "Error loading default configuration file %s while saving %s",
lxc_global_config_value("lxc.default_config"), c->name);
}
}
if (!create_container_dir(c))
return false;
return log_error(false, "Failed to create container directory");
/* If we're writing to the container's config file, take the disk lock.
* Otherwise just take the memlock to protect the struct lxc_container
@ -2640,19 +2638,23 @@ static bool do_lxcapi_save_config(struct lxc_container *c, const char *alt_file)
else
lret = container_mem_lock(c);
if (lret)
return false;
return log_error(false, "Failed to acquire lock");
fd = open(alt_file, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (fd < 0)
fd_config = open(alt_file, O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
if (fd_config < 0) {
SYSERROR("Failed to open config file \"%s\"", alt_file);
goto on_error;
}
lret = write_config(fd, c->lxc_conf);
close(fd);
if (lret < 0)
lret = write_config(fd_config, c->lxc_conf);
if (lret < 0) {
SYSERROR("Failed to write config file \"%s\"", alt_file);
goto on_error;
}
ret = true;
bret = true;
TRACE("Saved config file \"%s\"", alt_file);
on_error:
if (need_disklock)
@ -2660,7 +2662,7 @@ on_error:
else
container_mem_unlock(c);
return ret;
return bret;
}
WRAP_API_1(bool, lxcapi_save_config, const char *)