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fsmount: delete session dir on mount

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This commit is contained in:
Andy Green 2020-03-05 14:12:24 +00:00
parent 765d393f82
commit 993c7c3192
1 changed files with 47 additions and 1 deletions
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48
lib/misc/fsmount.c
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@ -37,13 +37,58 @@
#include <unistd.h>
#include <fcntl.h>
static int
rm_rf_cb(const char *dirpath, void *user, struct lws_dir_entry *lde)
{
char path[384];
if (!strcmp(lde->name, ".") || !strcmp(lde->name, ".."))
return 0;
lws_snprintf(path, sizeof(path), "%s/%s", dirpath, lde->name);
if (lde->type == LDOT_DIR) {
lws_dir(path, NULL, rm_rf_cb);
rmdir(path);
} else
unlink(path);
return 0;
}
int
lws_fsmount_mount(struct lws_fsmount *fsm)
{
struct libmnt_context *ctx;
char opts[512];
char opts[512], c;
int n, m;
/*
* For robustness, there are a couple of sticky situations caused by
* previous mounts not cleaning up... 1) still mounted on the mountpoint
* and 2) junk in the session dir from the dead session.
*
* For 1), do a gratuitous umount attempts until it feels nothing to
* umount...
*/
c = fsm->mp[0];
while (!lws_fsmount_unmount(fsm))
fsm->mp[0] = c;
fsm->mp[0] = c;
/*
* ... for 2), generate the session dir basepath and destroy everything
* in it... it's less dangerous than it sounds because there are
* hardcoded unusual dir names in the base path, so it can't go wild
* even if the overlay path is empty or /
*/
lws_snprintf(opts, sizeof(opts), "%s/overlays/%s/session",
fsm->overlay_path, fsm->ovname);
lwsl_info("%s: emptying session dir %s\n", __func__, opts);
lws_dir(opts, NULL, rm_rf_cb);
/*
* Piece together the options for the overlay mount...
*/
@ -78,6 +123,7 @@ lws_fsmount_mount(struct lws_fsmount *fsm)
mnt_context_set_source(ctx, "none");
lwsl_notice("%s: mount opts %s\n", __func__, opts);
puts(opts);
m = mnt_context_mount(ctx);
lwsl_notice("%s: mountpoint %s: %d\n", __func__, fsm->mp, m);