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157 lines
4.1 KiB
157 lines
4.1 KiB
/*
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* libwebsockets - small server side websockets and web server implementation
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*
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* Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicefsme, and/or
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* sell copies of the Software, and to permit persofsm to whom the Software is
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* furnished to do so, subject to the following conditiofsm:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portiofsm of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Mount and unmount overlayfs mountpoints (linux only)
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*/
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#include "private-lib-core.h"
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#include <unistd.h>
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#include <libmount/libmount.h>
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#include <string.h>
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#include <signal.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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static int
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rm_rf_cb(const char *dirpath, void *user, struct lws_dir_entry *lde)
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{
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char path[384];
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if (!strcmp(lde->name, ".") || !strcmp(lde->name, ".."))
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return 0;
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lws_snprintf(path, sizeof(path), "%s/%s", dirpath, lde->name);
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if (lde->type == LDOT_DIR) {
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lws_dir(path, NULL, rm_rf_cb);
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rmdir(path);
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} else
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unlink(path);
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return 0;
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}
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int
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lws_fsmount_mount(struct lws_fsmount *fsm)
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{
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struct libmnt_context *ctx;
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char opts[512], c;
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int n, m;
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/*
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* For robustness, there are a couple of sticky situations caused by
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* previous mounts not cleaning up... 1) still mounted on the mountpoint
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* and 2) junk in the session dir from the dead session.
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*
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* For 1), do a gratuitous umount attempts until it feels nothing to
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* umount...
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*/
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c = fsm->mp[0];
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while (!lws_fsmount_unmount(fsm))
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fsm->mp[0] = c;
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fsm->mp[0] = c;
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/*
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* ... for 2), generate the session dir basepath and destroy everything
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* in it... it's less dangerous than it sounds because there are
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* hardcoded unusual dir names in the base path, so it can't go wild
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* even if the overlay path is empty or /
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*/
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lws_snprintf(opts, sizeof(opts), "%s/overlays/%s/session",
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fsm->overlay_path, fsm->ovname);
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lwsl_info("%s: emptying session dir %s\n", __func__, opts);
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lws_dir(opts, NULL, rm_rf_cb);
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/*
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* Piece together the options for the overlay mount...
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*/
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n = lws_snprintf(opts, sizeof(opts), "lowerdir=");
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for (m = LWS_ARRAY_SIZE(fsm->layers) - 1; m >= 0; m--)
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if (fsm->layers[m]) {
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if (n != 9)
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opts[n++] = ':';
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n += lws_snprintf(&opts[n], sizeof(opts) - n,
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"%s/%s/%s", fsm->layers_path,
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fsm->distro, fsm->layers[m]);
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}
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n += lws_snprintf(&opts[n], sizeof(opts) - n,
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",upperdir=%s/overlays/%s/session",
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fsm->overlay_path, fsm->ovname);
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n += lws_snprintf(&opts[n], sizeof(opts) - n,
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",workdir=%s/overlays/%s/work",
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fsm->overlay_path, fsm->ovname);
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ctx = mnt_new_context();
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if (!ctx)
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return 1;
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mnt_context_set_fstype(ctx, "overlay");
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mnt_context_set_options(ctx, opts);
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mnt_context_set_mflags(ctx, MS_NOATIME /* |MS_NOEXEC */);
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mnt_context_set_target(ctx, fsm->mp);
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mnt_context_set_source(ctx, "none");
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lwsl_notice("%s: mount opts %s\n", __func__, opts);
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puts(opts);
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m = mnt_context_mount(ctx);
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lwsl_notice("%s: mountpoint %s: %d\n", __func__, fsm->mp, m);
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mnt_free_context(ctx);
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return m;
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}
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int
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lws_fsmount_unmount(struct lws_fsmount *fsm)
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{
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struct libmnt_context *ctx;
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int m;
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lwsl_notice("%s: %s\n", __func__, fsm->mp);
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ctx = mnt_new_context();
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if (!ctx)
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return 1;
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mnt_context_set_target(ctx, fsm->mp);
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m = mnt_context_umount(ctx);
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mnt_free_context(ctx);
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fsm->mp[0] = '\0';
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return m;
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}
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