Isolation of udev code from remaining systemd

This commit is a first attempt to isolate the udev code from the
remaining code base.  It intentionally does not modify any files
but purely delete files which, on a first examination, appear to
not be needed.  This is a sweeping commit which may easily have
missed needed code.  Files can be retrieved by doing a checkout
from the previous commit:

 git checkout 2944f347d0 -- <filename>

1 files changed, 0 insertions, 441 deletions

diff --git a/src/core/mount-setup.c b/src/core/mount-setup.c
deleted file mode 100644
index 98614d0c3e..0000000000
--- a/src/core/mount-setup.c
+++ /dev/null
@@ -1,441 +0,0 @@
-/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
-
-/***
-  This file is part of systemd.
-
-  Copyright 2010 Lennart Poettering
-
-  systemd is free software; you can redistribute it and/or modify it
-  under the terms of the GNU Lesser General Public License as published by
-  the Free Software Foundation; either version 2.1 of the License, or
-  (at your option) any later version.
-
-  systemd is distributed in the hope that it will be useful, but
-  WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-  Lesser General Public License for more details.
-
-  You should have received a copy of the GNU Lesser General Public License
-  along with systemd; If not, see <http://www.gnu.org/licenses/>.
-***/
-
-#include <sys/mount.h>
-#include <errno.h>
-#include <sys/stat.h>
-#include <stdlib.h>
-#include <string.h>
-#include <libgen.h>
-#include <assert.h>
-#include <unistd.h>
-#include <ftw.h>
-
-#include "mount-setup.h"
-#include "dev-setup.h"
-#include "log.h"
-#include "macro.h"
-#include "util.h"
-#include "label.h"
-#include "set.h"
-#include "strv.h"
-#include "mkdir.h"
-#include "path-util.h"
-#include "missing.h"
-#include "virt.h"
-
-#ifndef TTY_GID
-#define TTY_GID 5
-#endif
-
-typedef enum MountMode {
-        MNT_NONE  =        0,
-        MNT_FATAL =        1 <<  0,
-        MNT_IN_CONTAINER = 1 <<  1,
-} MountMode;
-
-typedef struct MountPoint {
-        const char *what;
-        const char *where;
-        const char *type;
-        const char *options;
-        unsigned long flags;
-        bool (*condition_fn)(void);
-        MountMode mode;
-} MountPoint;
-
-/* The first three entries we might need before SELinux is up. The
- * fourth (securityfs) is needed by IMA to load a custom policy. The
- * other ones we can delay until SELinux and IMA are loaded. */
-#define N_EARLY_MOUNT 4
-
-static const MountPoint mount_table[] = {
-        { "proc",       "/proc",                     "proc",       NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          NULL,       MNT_FATAL|MNT_IN_CONTAINER },
-        { "sysfs",      "/sys",                      "sysfs",      NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          NULL,       MNT_FATAL|MNT_IN_CONTAINER },
-        { "devtmpfs",   "/dev",                      "devtmpfs",   "mode=755", MS_NOSUID|MS_STRICTATIME,
-          NULL,       MNT_FATAL|MNT_IN_CONTAINER },
-        { "securityfs", "/sys/kernel/security",      "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          NULL,       MNT_NONE },
-        { "efivarfs",   "/sys/firmware/efi/efivars", "efivarfs",   NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          is_efiboot, MNT_NONE },
-        { "tmpfs",      "/dev/shm",                  "tmpfs",      "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
-          NULL,       MNT_FATAL|MNT_IN_CONTAINER },
-        { "devpts",     "/dev/pts",                  "devpts",     "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC,
-          NULL,       MNT_IN_CONTAINER },
-        { "tmpfs",      "/run",                      "tmpfs",      "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
-          NULL,       MNT_FATAL|MNT_IN_CONTAINER },
-        { "tmpfs",      "/sys/fs/cgroup",            "tmpfs",      "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
-          NULL,       MNT_IN_CONTAINER },
-        { "cgroup",     "/sys/fs/cgroup/systemd",    "cgroup",     "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
-          NULL,       MNT_IN_CONTAINER },
-};
-
-/* These are API file systems that might be mounted by other software,
- * we just list them here so that we know that we should ignore them */
-
-static const char ignore_paths[] =
-        /* SELinux file systems */
-        "/sys/fs/selinux\0"
-        "/selinux\0"
-        /* Legacy cgroup mount points */
-        "/dev/cgroup\0"
-        "/cgroup\0"
-        /* Legacy kernel file system */
-        "/proc/bus/usb\0"
-        /* Container bind mounts */
-        "/proc/sys\0"
-        "/dev/console\0"
-        "/proc/kmsg\0";
-
-bool mount_point_is_api(const char *path) {
-        unsigned i;
-
-        /* Checks if this mount point is considered "API", and hence
-         * should be ignored */
-
-        for (i = 0; i < ELEMENTSOF(mount_table); i ++)
-                if (path_equal(path, mount_table[i].where))
-                        return true;
-
-        return path_startswith(path, "/sys/fs/cgroup/");
-}
-
-bool mount_point_ignore(const char *path) {
-        const char *i;
-
-        NULSTR_FOREACH(i, ignore_paths)
-                if (path_equal(path, i))
-                        return true;
-
-        return false;
-}
-
-static int mount_one(const MountPoint *p, bool relabel) {
-        int r;
-
-        assert(p);
-
-        if (p->condition_fn && !p->condition_fn())
-                return 0;
-
-        /* Relabel first, just in case */
-        if (relabel)
-                label_fix(p->where, true, true);
-
-        r = path_is_mount_point(p->where, true);
-        if (r < 0)
-                return r;
-
-        if (r > 0)
-                return 0;
-
-        /* Skip securityfs in a container */
-        if (!(p->mode & MNT_IN_CONTAINER) && detect_container(NULL) > 0)
-                return 0;
-
-        /* The access mode here doesn't really matter too much, since
-         * the mounted file system will take precedence anyway. */
-        mkdir_p_label(p->where, 0755);
-
-        log_debug("Mounting %s to %s of type %s with options %s.",
-                  p->what,
-                  p->where,
-                  p->type,
-                  strna(p->options));
-
-        if (mount(p->what,
-                  p->where,
-                  p->type,
-                  p->flags,
-                  p->options) < 0) {
-                log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s: %s", p->where, strerror(errno));
-                return (p->mode & MNT_FATAL) ? -errno : 0;
-        }
-
-        /* Relabel again, since we now mounted something fresh here */
-        if (relabel)
-                label_fix(p->where, false, false);
-
-        return 1;
-}
-
-int mount_setup_early(void) {
-        unsigned i;
-        int r = 0;
-
-        assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table));
-
-        /* Do a minimal mount of /proc and friends to enable the most
-         * basic stuff, such as SELinux */
-        for (i = 0; i < N_EARLY_MOUNT; i ++)  {
-                int j;
-
-                j = mount_one(mount_table + i, false);
-                if (r == 0)
-                        r = j;
-        }
-
-        return r;
-}
-
-int mount_cgroup_controllers(char ***join_controllers) {
-        int r;
-        FILE *f;
-        char buf[LINE_MAX];
-        Set *controllers;
-
-        /* Mount all available cgroup controllers that are built into the kernel. */
-
-        f = fopen("/proc/cgroups", "re");
-        if (!f) {
-                log_error("Failed to enumerate cgroup controllers: %m");
-                return 0;
-        }
-
-        controllers = set_new(string_hash_func, string_compare_func);
-        if (!controllers) {
-                r = log_oom();
-                goto finish;
-        }
-
-        /* Ignore the header line */
-        (void) fgets(buf, sizeof(buf), f);
-
-        for (;;) {
-                char *controller;
-                int enabled = 0;
-
-                if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) {
-
-                        if (feof(f))
-                                break;
-
-                        log_error("Failed to parse /proc/cgroups.");
-                        r = -EIO;
-                        goto finish;
-                }
-
-                if (!enabled) {
-                        free(controller);
-                        continue;
-                }
-
-                r = set_put(controllers, controller);
-                if (r < 0) {
-                        log_error("Failed to add controller to set.");
-                        free(controller);
-                        goto finish;
-                }
-        }
-
-        for (;;) {
-                MountPoint p;
-                char *controller, *where, *options;
-                char ***k = NULL;
-
-                controller = set_steal_first(controllers);
-                if (!controller)
-                        break;
-
-                if (join_controllers)
-                        for (k = join_controllers; *k; k++)
-                                if (strv_find(*k, controller))
-                                        break;
-
-                if (k && *k) {
-                        char **i, **j;
-
-                        for (i = *k, j = *k; *i; i++) {
-
-                                if (!streq(*i, controller)) {
-                                        char *t;
-
-                                        t = set_remove(controllers, *i);
-                                        if (!t) {
-                                                free(*i);
-                                                continue;
-                                        }
-                                        free(t);
-                                }
-
-                                *(j++) = *i;
-                        }
-
-                        *j = NULL;
-
-                        options = strv_join(*k, ",");
-                        if (!options) {
-                                free(controller);
-                                r = log_oom();
-                                goto finish;
-                        }
-
-                } else {
-                        options = controller;
-                        controller = NULL;
-                }
-
-                where = strappend("/sys/fs/cgroup/", options);
-                if (!where) {
-                        free(options);
-                        r = log_oom();
-                        goto finish;
-                }
-
-                zero(p);
-                p.what = "cgroup";
-                p.where = where;
-                p.type = "cgroup";
-                p.options = options;
-                p.flags = MS_NOSUID|MS_NOEXEC|MS_NODEV;
-
-                r = mount_one(&p, true);
-                free(controller);
-                free(where);
-
-                if (r < 0) {
-                        free(options);
-                        goto finish;
-                }
-
-                if (r > 0 && k && *k) {
-                        char **i;
-
-                        for (i = *k; *i; i++) {
-                                char *t;
-
-                                t = strappend("/sys/fs/cgroup/", *i);
-                                if (!t) {
-                                        r = log_oom();
-                                        free(options);
-                                        goto finish;
-                                }
-
-                                r = symlink(options, t);
-                                free(t);
-
-                                if (r < 0 && errno != EEXIST) {
-                                        log_error("Failed to create symlink: %m");
-                                        r = -errno;
-                                        free(options);
-                                        goto finish;
-                                }
-                        }
-                }
-
-                free(options);
-        }
-
-        r = 0;
-
-finish:
-        set_free_free(controllers);
-
-        fclose(f);
-
-        return r;
-}
-
-static int nftw_cb(
-                const char *fpath,
-                const struct stat *sb,
-                int tflag,
-                struct FTW *ftwbuf) {
-
-        /* No need to label /dev twice in a row... */
-        if (_unlikely_(ftwbuf->level == 0))
-                return FTW_CONTINUE;
-
-        label_fix(fpath, false, false);
-
-        /* /run/initramfs is static data and big, no need to
-         * dynamically relabel its contents at boot... */
-        if (_unlikely_(ftwbuf->level == 1 &&
-                      tflag == FTW_D &&
-                      streq(fpath, "/run/initramfs")))
-                return FTW_SKIP_SUBTREE;
-
-        return FTW_CONTINUE;
-};
-
-int mount_setup(bool loaded_policy) {
-
-        static const char relabel[] =
-                "/run/initramfs/root-fsck\0"
-                "/run/initramfs/shutdown\0";
-
-        int r;
-        unsigned i;
-        const char *j;
-
-        for (i = 0; i < ELEMENTSOF(mount_table); i ++) {
-                r = mount_one(mount_table + i, true);
-
-                if (r < 0)
-                        return r;
-        }
-
-        /* Nodes in devtmpfs and /run need to be manually updated for
-         * the appropriate labels, after mounting. The other virtual
-         * API file systems like /sys and /proc do not need that, they
-         * use the same label for all their files. */
-        if (loaded_policy) {
-                usec_t before_relabel, after_relabel;
-                char timespan[FORMAT_TIMESPAN_MAX];
-
-                before_relabel = now(CLOCK_MONOTONIC);
-
-                nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
-                nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
-
-                /* Explicitly relabel these */
-                NULSTR_FOREACH(j, relabel)
-                        label_fix(j, true, false);
-
-                after_relabel = now(CLOCK_MONOTONIC);
-
-                log_info("Relabelled /dev and /run in %s.",
-                         format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel));
-        }
-
-        /* Create a few default symlinks, which are normally created
-         * by udevd, but some scripts might need them before we start
-         * udevd. */
-        dev_setup(NULL);
-
-        /* Mark the root directory as shared in regards to mount
-         * propagation. The kernel defaults to "private", but we think
-         * it makes more sense to have a default of "shared" so that
-         * nspawn and the container tools work out of the box. If
-         * specific setups need other settings they can reset the
-         * propagation mode to private if needed. */
-        if (detect_container(NULL) <= 0)
-                if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
-                        log_warning("Failed to set up the root directory for shared mount propagation: %m");
-
-        /* Create a few directories we always want around */
-        mkdir_label("/run/systemd", 0755);
-        mkdir_label("/run/systemd/system", 0755);
-
-        return 0;
-}