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synced 2024-09-06 16:56:43 +00:00
nspawn: rework how /run/host/ is set up
Let's find the right os-release file on the host side, and only mount the one that matters, i.e. /etc/os-release if it exists and /usr/lib/os-release otherwise. Use the fixed path /run/host/os-release for that. Let's also mount /run/host as a bind mount on itself before we set up /run/host, and let's mount it MS_RDONLY after we are done, so that it remains immutable as a whole.
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@ -563,15 +563,16 @@ int mount_all(const char *dest,
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MOUNT_FATAL|MOUNT_MKDIR },
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{ "tmpfs", "/run", "tmpfs", "mode=755" TMPFS_LIMITS_RUN, MS_NOSUID|MS_NODEV|MS_STRICTATIME,
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MOUNT_FATAL|MOUNT_MKDIR },
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{ "/usr/lib/os-release", "/run/host/usr/lib/os-release", NULL, NULL, MS_BIND,
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MOUNT_FATAL|MOUNT_MKDIR|MOUNT_TOUCH }, /* As per kernel interface requirements, bind mount first (creating mount points) and make read-only later */
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{ NULL, "/run/host/usr/lib/os-release", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
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0 },
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{ "/etc/os-release", "/run/host/etc/os-release", NULL, NULL, MS_BIND,
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MOUNT_MKDIR|MOUNT_TOUCH },
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{ NULL, "/run/host/etc/os-release", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
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0 },
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{ "/run/host", "/run/host", NULL, NULL, MS_BIND,
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MOUNT_FATAL|MOUNT_MKDIR|MOUNT_PREFIX_ROOT }, /* Prepare this so that we can make it read-only when we are done */
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{ "/etc/os-release", "/run/host/os-release", NULL, NULL, MS_BIND,
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MOUNT_TOUCH }, /* As per kernel interface requirements, bind mount first (creating mount points) and make read-only later */
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{ "/usr/lib/os-release", "/run/host/os-release", NULL, NULL, MS_BIND,
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MOUNT_FATAL }, /* If /etc/os-release doesn't exist use the version in /usr/lib as fallback */
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{ NULL, "/run/host/os-release", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
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MOUNT_FATAL },
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{ NULL, "/run/host", NULL, NULL, MS_BIND|MS_RDONLY|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_REMOUNT,
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MOUNT_FATAL|MOUNT_IN_USERNS },
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#if HAVE_SELINUX
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{ "/sys/fs/selinux", "/sys/fs/selinux", NULL, NULL, MS_BIND,
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MOUNT_MKDIR }, /* Bind mount first (mkdir/chown the mount point in case /sys/ is mounted as minimal skeleton tmpfs) */
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@ -589,9 +590,9 @@ int mount_all(const char *dest,
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int r;
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for (k = 0; k < ELEMENTSOF(mount_table); k++) {
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_cleanup_free_ char *where = NULL, *options = NULL;
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const char *o;
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_cleanup_free_ char *where = NULL, *options = NULL, *prefixed = NULL;
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bool fatal = FLAGS_SET(mount_table[k].mount_settings, MOUNT_FATAL);
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const char *o;
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if (in_userns != FLAGS_SET(mount_table[k].mount_settings, MOUNT_IN_USERNS))
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continue;
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@ -616,20 +617,9 @@ int mount_all(const char *dest,
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return log_error_errno(r, "Failed to detect whether %s is a mount point: %m", where);
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if (r > 0)
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continue;
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/* Shortcut for optional bind mounts: if the source can't be found skip ahead to avoid creating
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* empty and unused directories. */
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if (!fatal && FLAGS_SET(mount_table[k].mount_settings, MOUNT_MKDIR) && FLAGS_SET(mount_table[k].flags, MS_BIND)) {
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r = access(mount_table[k].what, F_OK);
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if (r < 0) {
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if (errno == ENOENT)
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continue;
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return log_error_errno(errno, "Failed to stat %s: %m", mount_table[k].what);
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}
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}
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}
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if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_MKDIR)) {
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if ((mount_table[k].mount_settings & (MOUNT_MKDIR|MOUNT_TOUCH)) != 0) {
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uid_t u = (use_userns && !in_userns) ? uid_shift : UID_INVALID;
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if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_TOUCH))
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@ -647,13 +637,17 @@ int mount_all(const char *dest,
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if (r != -EROFS)
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continue;
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}
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if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_TOUCH)) {
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r = touch(where);
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if (r < 0 && r != -EEXIST) {
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if (fatal)
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return log_error_errno(r, "Failed to create mount point %s: %m", where);
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log_debug_errno(r, "Failed to create mount point %s: %m", where);
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}
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}
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if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_TOUCH)) {
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r = touch(where);
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if (r < 0 && r != -EEXIST) {
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if (fatal && r != -EROFS)
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return log_error_errno(r, "Failed to create file %s: %m", where);
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log_debug_errno(r, "Failed to create file %s: %m", where);
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if (r != -EROFS)
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continue;
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}
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}
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@ -666,8 +660,18 @@ int mount_all(const char *dest,
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o = options;
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}
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if (FLAGS_SET(mount_table[k].mount_settings, MOUNT_PREFIX_ROOT)) {
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/* Optionally prefix the mount source with the root dir. This is useful in bind
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* mounts to be created within the container image before we transition into it. Note
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* that MOUNT_IN_USERNS is run after we transitioned hence prefixing is not ncessary
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* for those. */
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r = chase_symlinks(mount_table[k].what, dest, CHASE_PREFIX_ROOT, &prefixed, NULL);
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if (r < 0)
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return log_error_errno(r, "Failed to resolve %s/%s: %m", dest, mount_table[k].what);
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}
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r = mount_verbose(fatal ? LOG_ERR : LOG_DEBUG,
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mount_table[k].what,
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prefixed ?: mount_table[k].what,
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where,
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mount_table[k].type,
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mount_table[k].flags,
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@ -18,6 +18,7 @@ typedef enum MountSettingsMask {
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MOUNT_NON_ROOT_ONLY = 1 << 7, /* if set, only non-root mounts are mounted */
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MOUNT_MKDIR = 1 << 8, /* if set, make directory to mount over first */
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MOUNT_TOUCH = 1 << 9, /* if set, touch file to mount over first */
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MOUNT_PREFIX_ROOT = 1 << 10,/* if set, prefix the source path with the container's root directory */
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} MountSettingsMask;
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typedef enum CustomMountType {
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@ -66,12 +66,25 @@ if [ -n "${ID:+set}" ] && [ "${ID}" != "${container_host_id}" ]; then exit 1; fi
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if [ -n "${VERSION_ID:+set}" ] && [ "${VERSION_ID}" != "${container_host_version_id}" ]; then exit 1; fi
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if [ -n "${BUILD_ID:+set}" ] && [ "${BUILD_ID}" != "${container_host_build_id}" ]; then exit 1; fi
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if [ -n "${VARIANT_ID:+set}" ] && [ "${VARIANT_ID}" != "${container_host_variant_id}" ]; then exit 1; fi
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cd /tmp; (cd /run/host/usr/lib; md5sum os-release) | md5sum -c
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if echo test >> /run/host/usr/lib/os-release; then exit 1; fi
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if echo test >> /run/host/etc/os-release; then exit 1; fi
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cd /tmp; (cd /run/host; md5sum os-release) | md5sum -c
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if echo test >> /run/host/os-release; then exit 1; fi
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'
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systemd-nspawn --register=no -D /testsuite-13.nc-container --bind=/etc/os-release:/tmp/os-release /bin/sh -x -e -c "$_cmd"
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local _os_release_source="/etc/os-release"
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if [ ! -r "${_os_release_source}" ]; then
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_os_release_source="/usr/lib/os-release"
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elif [ -L "${_os_release_source}" ] && rm /etc/os-release; then
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# Ensure that /etc always wins if available
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cp /usr/lib/os-release /etc
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echo MARKER=1 >> /etc/os-release
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fi
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systemd-nspawn --register=no -D /testsuite-13.nc-container --bind="${_os_release_source}":/tmp/os-release /bin/sh -x -e -c "$_cmd"
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if grep -q MARKER /etc/os-release; then
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rm /etc/os-release
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ln -s ../usr/lib/os-release /etc/os-release
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fi
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}
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function run {
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