diff options
Diffstat (limited to 'src/mount')
| -rw-r--r-- | src/mount/meson.build | 13 | ||||
| -rw-r--r-- | src/mount/mount-tool.c | 1590 |
2 files changed, 1603 insertions, 0 deletions
diff --git a/src/mount/meson.build b/src/mount/meson.build new file mode 100644 index 0000000..176fb53 --- /dev/null +++ b/src/mount/meson.build @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: LGPL-2.1-or-later + +executables += [ + executable_template + { + 'name' : 'systemd-mount', + 'public' : true, + 'sources' : files('mount-tool.c'), + 'dependencies' : libmount, + }, +] + +meson.add_install_script(sh, '-c', ln_s.format(bindir / 'systemd-mount', + bindir / 'systemd-umount')) diff --git a/src/mount/mount-tool.c b/src/mount/mount-tool.c new file mode 100644 index 0000000..f626f07 --- /dev/null +++ b/src/mount/mount-tool.c @@ -0,0 +1,1590 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <getopt.h> + +#include "sd-bus.h" +#include "sd-device.h" + +#include "build.h" +#include "bus-error.h" +#include "bus-locator.h" +#include "bus-unit-util.h" +#include "bus-wait-for-jobs.h" +#include "chase.h" +#include "device-util.h" +#include "dirent-util.h" +#include "escape.h" +#include "fd-util.h" +#include "fileio.h" +#include "format-table.h" +#include "format-util.h" +#include "fs-util.h" +#include "fstab-util.h" +#include "libmount-util.h" +#include "main-func.h" +#include "mount-util.h" +#include "mountpoint-util.h" +#include "pager.h" +#include "parse-argument.h" +#include "parse-util.h" +#include "path-util.h" +#include "pretty-print.h" +#include "process-util.h" +#include "sort-util.h" +#include "spawn-polkit-agent.h" +#include "stat-util.h" +#include "strv.h" +#include "terminal-util.h" +#include "udev-util.h" +#include "umask-util.h" +#include "unit-def.h" +#include "unit-name.h" +#include "user-util.h" + +enum { + ACTION_DEFAULT, + ACTION_MOUNT, + ACTION_AUTOMOUNT, + ACTION_UMOUNT, + ACTION_LIST, +} arg_action = ACTION_DEFAULT; + +static bool arg_no_block = false; +static PagerFlags arg_pager_flags = 0; +static bool arg_legend = true; +static bool arg_full = false; +static bool arg_ask_password = true; +static bool arg_quiet = false; +static BusTransport arg_transport = BUS_TRANSPORT_LOCAL; +static RuntimeScope arg_runtime_scope = RUNTIME_SCOPE_SYSTEM; +static const char *arg_host = NULL; +static bool arg_discover = false; +static char *arg_mount_what = NULL; +static char *arg_mount_where = NULL; +static char *arg_mount_type = NULL; +static char *arg_mount_options = NULL; +static char *arg_description = NULL; +static char **arg_property = NULL; +static usec_t arg_timeout_idle = USEC_INFINITY; +static bool arg_timeout_idle_set = false; +static char **arg_automount_property = NULL; +static int arg_bind_device = -1; +static uid_t arg_uid = UID_INVALID; +static gid_t arg_gid = GID_INVALID; +static bool arg_fsck = true; +static bool arg_aggressive_gc = false; +static bool arg_tmpfs = false; + +STATIC_DESTRUCTOR_REGISTER(arg_mount_what, freep); +STATIC_DESTRUCTOR_REGISTER(arg_mount_where, freep); +STATIC_DESTRUCTOR_REGISTER(arg_mount_type, freep); +STATIC_DESTRUCTOR_REGISTER(arg_mount_options, freep); +STATIC_DESTRUCTOR_REGISTER(arg_description, freep); +STATIC_DESTRUCTOR_REGISTER(arg_property, strv_freep); +STATIC_DESTRUCTOR_REGISTER(arg_automount_property, strv_freep); + +static int parse_where(const char *input, char **ret_where) { + int r; + + assert(input); + assert(ret_where); + + if (arg_transport == BUS_TRANSPORT_LOCAL) { + r = chase(input, NULL, CHASE_NONEXISTENT, ret_where, NULL); + if (r < 0) + return log_error_errno(r, "Failed to make path %s absolute: %m", input); + } else { + if (!path_is_absolute(input)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path must be absolute when operating remotely: %s", + input); + + r = path_simplify_alloc(input, ret_where); + if (r < 0) + return log_error_errno(r, "Failed to simplify path %s: %m", input); + } + + return 0; +} + +static int help(void) { + _cleanup_free_ char *link = NULL; + int r; + + r = terminal_urlify_man("systemd-mount", "1", &link); + if (r < 0) + return log_oom(); + + printf("systemd-mount [OPTIONS...] WHAT [WHERE]\n" + "systemd-mount [OPTIONS...] --tmpfs [NAME] WHERE\n" + "systemd-mount [OPTIONS...] --list\n" + "%s [OPTIONS...] %sWHAT|WHERE...\n\n" + "Establish a mount or auto-mount point transiently.\n\n" + " -h --help Show this help\n" + " --version Show package version\n" + " --no-block Do not wait until operation finished\n" + " --no-pager Do not pipe output into a pager\n" + " --no-legend Do not show the headers\n" + " -l --full Do not ellipsize output\n" + " --no-ask-password Do not prompt for password\n" + " -q --quiet Suppress information messages during runtime\n" + " --user Run as user unit\n" + " -H --host=[USER@]HOST Operate on remote host\n" + " -M --machine=CONTAINER Operate on local container\n" + " --discover Discover mount device metadata\n" + " -t --type=TYPE File system type\n" + " -o --options=OPTIONS Mount options\n" + " --owner=USER Add uid= and gid= options for USER\n" + " --fsck=no Don't run file system check before mount\n" + " --description=TEXT Description for unit\n" + " -p --property=NAME=VALUE Set mount unit property\n" + " -A --automount=BOOL Create an auto-mount point\n" + " --timeout-idle-sec=SEC Specify automount idle timeout\n" + " --automount-property=NAME=VALUE\n" + " Set automount unit property\n" + " --bind-device Bind automount unit to device\n" + " --list List mountable block devices\n" + " -u --umount Unmount mount points\n" + " -G --collect Unload unit after it stopped, even when failed\n" + " -T --tmpfs Create a new tmpfs on the mount point\n" + "\nSee the %s for details.\n", + program_invocation_short_name, + streq(program_invocation_short_name, "systemd-umount") ? "" : "--umount ", + link); + + return 0; +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + ARG_NO_BLOCK, + ARG_NO_PAGER, + ARG_NO_LEGEND, + ARG_NO_ASK_PASSWORD, + ARG_USER, + ARG_SYSTEM, + ARG_DISCOVER, + ARG_MOUNT_TYPE, + ARG_MOUNT_OPTIONS, + ARG_OWNER, + ARG_FSCK, + ARG_DESCRIPTION, + ARG_TIMEOUT_IDLE, + ARG_AUTOMOUNT, + ARG_AUTOMOUNT_PROPERTY, + ARG_BIND_DEVICE, + ARG_LIST, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "no-block", no_argument, NULL, ARG_NO_BLOCK }, + { "no-pager", no_argument, NULL, ARG_NO_PAGER }, + { "no-legend", no_argument, NULL, ARG_NO_LEGEND }, + { "full", no_argument, NULL, 'l' }, + { "no-ask-password", no_argument, NULL, ARG_NO_ASK_PASSWORD }, + { "quiet", no_argument, NULL, 'q' }, + { "user", no_argument, NULL, ARG_USER }, + { "system", no_argument, NULL, ARG_SYSTEM }, + { "host", required_argument, NULL, 'H' }, + { "machine", required_argument, NULL, 'M' }, + { "discover", no_argument, NULL, ARG_DISCOVER }, + { "type", required_argument, NULL, 't' }, + { "options", required_argument, NULL, 'o' }, + { "owner", required_argument, NULL, ARG_OWNER }, + { "fsck", required_argument, NULL, ARG_FSCK }, + { "description", required_argument, NULL, ARG_DESCRIPTION }, + { "property", required_argument, NULL, 'p' }, + { "automount", required_argument, NULL, ARG_AUTOMOUNT }, + { "timeout-idle-sec", required_argument, NULL, ARG_TIMEOUT_IDLE }, + { "automount-property", required_argument, NULL, ARG_AUTOMOUNT_PROPERTY }, + { "bind-device", no_argument, NULL, ARG_BIND_DEVICE }, + { "list", no_argument, NULL, ARG_LIST }, + { "umount", no_argument, NULL, 'u' }, + { "unmount", no_argument, NULL, 'u' }, /* Compat spelling */ + { "collect", no_argument, NULL, 'G' }, + { "tmpfs", no_argument, NULL, 'T' }, + {}, + }; + + int r, c; + + assert(argc >= 0); + assert(argv); + + if (invoked_as(argv, "systemd-umount")) + arg_action = ACTION_UMOUNT; + + while ((c = getopt_long(argc, argv, "hqH:M:t:o:p:AuGlT", options, NULL)) >= 0) + + switch (c) { + + case 'h': + return help(); + + case ARG_VERSION: + return version(); + + case ARG_NO_BLOCK: + arg_no_block = true; + break; + + case ARG_NO_PAGER: + arg_pager_flags |= PAGER_DISABLE; + break; + + case ARG_NO_LEGEND: + arg_legend = false; + break; + + case 'l': + arg_full = true; + break; + + case ARG_NO_ASK_PASSWORD: + arg_ask_password = false; + break; + + case 'q': + arg_quiet = true; + break; + + case ARG_USER: + arg_runtime_scope = RUNTIME_SCOPE_USER; + break; + + case ARG_SYSTEM: + arg_runtime_scope = RUNTIME_SCOPE_SYSTEM; + break; + + case 'H': + arg_transport = BUS_TRANSPORT_REMOTE; + arg_host = optarg; + break; + + case 'M': + arg_transport = BUS_TRANSPORT_MACHINE; + arg_host = optarg; + break; + + case ARG_DISCOVER: + arg_discover = true; + break; + + case 't': + r = free_and_strdup_warn(&arg_mount_type, optarg); + if (r < 0) + return r; + break; + + case 'o': + r = free_and_strdup_warn(&arg_mount_options, optarg); + if (r < 0) + return r; + break; + + case ARG_OWNER: { + const char *user = optarg; + + r = get_user_creds(&user, &arg_uid, &arg_gid, NULL, NULL, 0); + if (r < 0) + return log_error_errno(r, + r == -EBADMSG ? "UID or GID of user %s are invalid." + : "Cannot use \"%s\" as owner: %m", + optarg); + break; + } + + case ARG_FSCK: + r = parse_boolean_argument("--fsck=", optarg, &arg_fsck); + if (r < 0) + return r; + break; + + case ARG_DESCRIPTION: + r = free_and_strdup_warn(&arg_description, optarg); + if (r < 0) + return r; + break; + + case 'p': + if (strv_extend(&arg_property, optarg) < 0) + return log_oom(); + + break; + + case 'A': + arg_action = ACTION_AUTOMOUNT; + break; + + case ARG_AUTOMOUNT: + r = parse_boolean_argument("--automount=", optarg, NULL); + if (r < 0) + return r; + + arg_action = r ? ACTION_AUTOMOUNT : ACTION_MOUNT; + break; + + case ARG_TIMEOUT_IDLE: + r = parse_sec(optarg, &arg_timeout_idle); + if (r < 0) + return log_error_errno(r, "Failed to parse timeout: %s", optarg); + + break; + + case ARG_AUTOMOUNT_PROPERTY: + if (strv_extend(&arg_automount_property, optarg) < 0) + return log_oom(); + + break; + + case ARG_BIND_DEVICE: + arg_bind_device = true; + break; + + case ARG_LIST: + arg_action = ACTION_LIST; + break; + + case 'u': + arg_action = ACTION_UMOUNT; + break; + + case 'G': + arg_aggressive_gc = true; + break; + + case 'T': + arg_tmpfs = true; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached(); + } + + if (arg_runtime_scope == RUNTIME_SCOPE_USER) { + arg_ask_password = false; + + if (arg_transport != BUS_TRANSPORT_LOCAL) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Execution in user context is not supported on non-local systems."); + } + + if (arg_action == ACTION_LIST) { + if (optind < argc) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Too many arguments."); + + if (arg_transport != BUS_TRANSPORT_LOCAL) + return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "Listing devices only supported locally."); + } else if (arg_action == ACTION_UMOUNT) { + if (optind >= argc) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "At least one argument required."); + + if (arg_transport != BUS_TRANSPORT_LOCAL) + for (int i = optind; i < argc; i++) + if (!path_is_absolute(argv[i])) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path must be absolute when operating remotely: %s", + argv[i]); + } else { + if (optind >= argc) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "At least one argument required."); + + if (argc > optind+2) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "More than two arguments are not allowed."); + + if (arg_tmpfs) { + if (argc <= optind+1) { + arg_mount_what = strdup("tmpfs"); + if (!arg_mount_what) + return log_oom(); + + r = parse_where(argv[optind], &arg_mount_where); + if (r < 0) + return r; + } else { + arg_mount_what = strdup(argv[optind]); + if (!arg_mount_what) + return log_oom(); + } + + if (!strv_contains(arg_property, "Type=tmpfs") && + strv_extend(&arg_property, "Type=tmpfs") < 0) + return log_oom(); + } else { + if (arg_mount_type && !fstype_is_blockdev_backed(arg_mount_type)) { + arg_mount_what = strdup(argv[optind]); + if (!arg_mount_what) + return log_oom(); + + } else if (arg_transport == BUS_TRANSPORT_LOCAL) { + _cleanup_free_ char *u = NULL; + + u = fstab_node_to_udev_node(argv[optind]); + if (!u) + return log_oom(); + + r = chase(u, NULL, 0, &arg_mount_what, NULL); + if (r < 0) + return log_error_errno(r, "Failed to make path %s absolute: %m", u); + + } else { + if (!path_is_absolute(argv[optind])) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path must be absolute when operating remotely: %s", + argv[optind]); + + r = path_simplify_alloc(argv[optind], &arg_mount_what); + if (r < 0) + return log_error_errno(r, "Failed to simplify path: %m"); + } + } + + if (argc > optind+1) { + r = parse_where(argv[optind+1], &arg_mount_where); + if (r < 0) + return r; + } else if (!arg_tmpfs) + arg_discover = true; + + if (arg_discover && arg_transport != BUS_TRANSPORT_LOCAL) + return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "Automatic mount location discovery is only supported locally."); + } + + return 1; +} + +static int transient_unit_set_properties(sd_bus_message *m, UnitType t, char **properties) { + int r; + + if (!isempty(arg_description)) { + r = sd_bus_message_append(m, "(sv)", "Description", "s", arg_description); + if (r < 0) + return r; + } + + if (arg_bind_device && is_device_path(arg_mount_what)) { + _cleanup_free_ char *device_unit = NULL; + + r = unit_name_from_path(arg_mount_what, ".device", &device_unit); + if (r < 0) + return r; + + r = sd_bus_message_append(m, "(sv)(sv)", + "After", "as", 1, device_unit, + "BindsTo", "as", 1, device_unit); + if (r < 0) + return r; + } + + if (arg_aggressive_gc) { + r = sd_bus_message_append(m, "(sv)", "CollectMode", "s", "inactive-or-failed"); + if (r < 0) + return r; + } + + r = bus_append_unit_property_assignment_many(m, t, properties); + if (r < 0) + return r; + + return 0; +} + +static int transient_mount_set_properties(sd_bus_message *m) { + int r; + + assert(m); + + r = transient_unit_set_properties(m, UNIT_MOUNT, arg_property); + if (r < 0) + return r; + + if (arg_mount_what) { + r = sd_bus_message_append(m, "(sv)", "What", "s", arg_mount_what); + if (r < 0) + return r; + } + + if (arg_mount_type) { + r = sd_bus_message_append(m, "(sv)", "Type", "s", arg_mount_type); + if (r < 0) + return r; + } + + _cleanup_free_ char *options = NULL; + + /* Prepend uid=…,gid=… if arg_uid is set */ + if (arg_uid != UID_INVALID) { + r = strextendf_with_separator(&options, ",", + "uid="UID_FMT",gid="GID_FMT, arg_uid, arg_gid); + if (r < 0) + return r; + } + + /* Override the default for tmpfs mounts. The kernel sets the sticky bit on the root directory by + * default. This makes sense for the case when the user does 'mount -t tmpfs tmpfs /tmp', but less so + * for other directories. + * + * Let's also set some reasonable limits. We use the current umask, to match what a command to create + * directory would use, e.g. mkdir. */ + if (arg_tmpfs) { + mode_t mask; + + r = get_process_umask(0, &mask); + if (r < 0) + return r; + + assert((mask & ~0777) == 0); + r = strextendf_with_separator(&options, ",", + "mode=0%o,nodev,nosuid%s", 0777 & ~mask, NESTED_TMPFS_LIMITS); + if (r < 0) + return r; + } + + if (arg_mount_options) + if (!strextend_with_separator(&options, ",", arg_mount_options)) + return -ENOMEM; + + if (options) { + log_debug("Using mount options: %s", options); + r = sd_bus_message_append(m, "(sv)", "Options", "s", options); + if (r < 0) + return r; + } else + log_debug("Not using any mount options"); + + if (arg_fsck) { + _cleanup_free_ char *fsck = NULL; + + r = unit_name_from_path_instance("systemd-fsck", arg_mount_what, ".service", &fsck); + if (r < 0) + return r; + + r = sd_bus_message_append(m, + "(sv)(sv)", + "Requires", "as", 1, fsck, + "After", "as", 1, fsck); + if (r < 0) + return r; + } + + return 0; +} + +static int transient_automount_set_properties(sd_bus_message *m) { + int r; + + assert(m); + + r = transient_unit_set_properties(m, UNIT_AUTOMOUNT, arg_automount_property); + if (r < 0) + return r; + + if (arg_timeout_idle != USEC_INFINITY) { + r = sd_bus_message_append(m, "(sv)", "TimeoutIdleUSec", "t", arg_timeout_idle); + if (r < 0) + return r; + } + + return 0; +} + +static int start_transient_mount( + sd_bus *bus, + char **argv) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL; + _cleanup_free_ char *mount_unit = NULL; + int r; + + if (!arg_no_block) { + r = bus_wait_for_jobs_new(bus, &w); + if (r < 0) + return log_error_errno(r, "Could not watch jobs: %m"); + } + + r = unit_name_from_path(arg_mount_where, ".mount", &mount_unit); + if (r < 0) + return log_error_errno(r, "Failed to make mount unit name: %m"); + + r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, "StartTransientUnit"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_set_allow_interactive_authorization(m, arg_ask_password); + if (r < 0) + return bus_log_create_error(r); + + /* Name and mode */ + r = sd_bus_message_append(m, "ss", mount_unit, "fail"); + if (r < 0) + return bus_log_create_error(r); + + /* Properties */ + r = sd_bus_message_open_container(m, 'a', "(sv)"); + if (r < 0) + return bus_log_create_error(r); + + r = transient_mount_set_properties(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + /* Auxiliary units */ + r = sd_bus_message_append(m, "a(sa(sv))", 0); + if (r < 0) + return bus_log_create_error(r); + + polkit_agent_open_if_enabled(arg_transport, arg_ask_password); + + r = sd_bus_call(bus, m, 0, &error, &reply); + if (r < 0) + return log_error_errno(r, "Failed to start transient mount unit: %s", bus_error_message(&error, r)); + + if (w) { + const char *object; + + r = sd_bus_message_read(reply, "o", &object); + if (r < 0) + return bus_log_parse_error(r); + + r = bus_wait_for_jobs_one(w, object, arg_quiet, NULL); + if (r < 0) + return r; + } + + if (!arg_quiet) + log_info("Started unit %s%s%s for mount point: %s%s%s", + ansi_highlight(), mount_unit, ansi_normal(), + ansi_highlight(), arg_mount_where, ansi_normal()); + + return 0; +} + +static int start_transient_automount( + sd_bus *bus, + char **argv) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL; + _cleanup_free_ char *automount_unit = NULL, *mount_unit = NULL; + int r; + + if (!arg_no_block) { + r = bus_wait_for_jobs_new(bus, &w); + if (r < 0) + return log_error_errno(r, "Could not watch jobs: %m"); + } + + r = unit_name_from_path(arg_mount_where, ".automount", &automount_unit); + if (r < 0) + return log_error_errno(r, "Failed to make automount unit name: %m"); + + r = unit_name_from_path(arg_mount_where, ".mount", &mount_unit); + if (r < 0) + return log_error_errno(r, "Failed to make mount unit name: %m"); + + r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, "StartTransientUnit"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_set_allow_interactive_authorization(m, arg_ask_password); + if (r < 0) + return bus_log_create_error(r); + + /* Name and mode */ + r = sd_bus_message_append(m, "ss", automount_unit, "fail"); + if (r < 0) + return bus_log_create_error(r); + + /* Properties */ + r = sd_bus_message_open_container(m, 'a', "(sv)"); + if (r < 0) + return bus_log_create_error(r); + + r = transient_automount_set_properties(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + /* Auxiliary units */ + r = sd_bus_message_open_container(m, 'a', "(sa(sv))"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_open_container(m, 'r', "sa(sv)"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_append(m, "s", mount_unit); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_open_container(m, 'a', "(sv)"); + if (r < 0) + return bus_log_create_error(r); + + r = transient_mount_set_properties(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_close_container(m); + if (r < 0) + return bus_log_create_error(r); + + polkit_agent_open_if_enabled(arg_transport, arg_ask_password); + + r = sd_bus_call(bus, m, 0, &error, &reply); + if (r < 0) + return log_error_errno(r, "Failed to start transient automount unit: %s", bus_error_message(&error, r)); + + if (w) { + const char *object; + + r = sd_bus_message_read(reply, "o", &object); + if (r < 0) + return bus_log_parse_error(r); + + r = bus_wait_for_jobs_one(w, object, arg_quiet, NULL); + if (r < 0) + return r; + } + + if (!arg_quiet) + log_info("Started unit %s%s%s for mount point: %s%s%s", + ansi_highlight(), automount_unit, ansi_normal(), + ansi_highlight(), arg_mount_where, ansi_normal()); + + return 0; +} + +static int find_mount_points(const char *what, char ***list) { + _cleanup_(mnt_free_tablep) struct libmnt_table *table = NULL; + _cleanup_(mnt_free_iterp) struct libmnt_iter *iter = NULL; + _cleanup_strv_free_ char **l = NULL; + size_t n = 0; + int r; + + assert(what); + assert(list); + + /* Returns all mount points obtained from /proc/self/mountinfo in *list, + * and the number of mount points as return value. */ + + r = libmount_parse(NULL, NULL, &table, &iter); + if (r < 0) + return log_error_errno(r, "Failed to parse /proc/self/mountinfo: %m"); + + for (;;) { + struct libmnt_fs *fs; + const char *source, *target; + + r = mnt_table_next_fs(table, iter, &fs); + if (r == 1) + break; + if (r < 0) + return log_error_errno(r, "Failed to get next entry from /proc/self/mountinfo: %m"); + + source = mnt_fs_get_source(fs); + target = mnt_fs_get_target(fs); + if (!source || !target) + continue; + + if (!path_equal(source, what)) + continue; + + /* one extra slot is needed for the terminating NULL */ + if (!GREEDY_REALLOC0(l, n + 2)) + return log_oom(); + + l[n] = strdup(target); + if (!l[n]) + return log_oom(); + n++; + } + + if (!GREEDY_REALLOC0(l, n + 1)) + return log_oom(); + + *list = TAKE_PTR(l); + return n; +} + +static int find_loop_device(const char *backing_file, sd_device **ret) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + int r; + + assert(backing_file); + assert(ret); + + r = sd_device_enumerator_new(&e); + if (r < 0) + return log_oom(); + + r = sd_device_enumerator_add_match_subsystem(e, "block", /* match = */ true); + if (r < 0) + return log_error_errno(r, "Failed to add subsystem match: %m"); + + r = sd_device_enumerator_add_match_property(e, "ID_FS_USAGE", "filesystem"); + if (r < 0) + return log_error_errno(r, "Failed to add property match: %m"); + + r = sd_device_enumerator_add_match_sysname(e, "loop*"); + if (r < 0) + return log_error_errno(r, "Failed to add sysname match: %m"); + + r = sd_device_enumerator_add_match_sysattr(e, "loop/backing_file", /* value = */ NULL, /* match = */ true); + if (r < 0) + return log_error_errno(r, "Failed to add sysattr match: %m"); + + FOREACH_DEVICE(e, dev) { + const char *s; + + r = sd_device_get_sysattr_value(dev, "loop/backing_file", &s); + if (r < 0) { + log_device_debug_errno(dev, r, "Failed to read \"loop/backing_file\" sysattr, ignoring: %m"); + continue; + } + + if (inode_same(s, backing_file, 0) <= 0) + continue; + + *ret = sd_device_ref(dev); + return 0; + } + + return -ENXIO; +} + +static int stop_mount( + sd_bus *bus, + const char *where, + const char *suffix) { + + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL; + _cleanup_free_ char *mount_unit = NULL; + int r; + + if (!arg_no_block) { + r = bus_wait_for_jobs_new(bus, &w); + if (r < 0) + return log_error_errno(r, "Could not watch jobs: %m"); + } + + r = unit_name_from_path(where, suffix, &mount_unit); + if (r < 0) + return log_error_errno(r, "Failed to make %s unit name from path %s: %m", suffix + 1, where); + + r = bus_message_new_method_call(bus, &m, bus_systemd_mgr, "StopUnit"); + if (r < 0) + return bus_log_create_error(r); + + r = sd_bus_message_set_allow_interactive_authorization(m, arg_ask_password); + if (r < 0) + return bus_log_create_error(r); + + /* Name and mode */ + r = sd_bus_message_append(m, "ss", mount_unit, "fail"); + if (r < 0) + return bus_log_create_error(r); + + polkit_agent_open_if_enabled(arg_transport, arg_ask_password); + + r = sd_bus_call(bus, m, 0, &error, &reply); + if (r < 0) { + if (streq(suffix, ".automount") && + sd_bus_error_has_name(&error, "org.freedesktop.systemd1.NoSuchUnit")) + return 0; + return log_error_errno(r, "Failed to stop %s unit: %s", suffix + 1, bus_error_message(&error, r)); + } + + if (w) { + const char *object; + + r = sd_bus_message_read(reply, "o", &object); + if (r < 0) + return bus_log_parse_error(r); + + r = bus_wait_for_jobs_one(w, object, arg_quiet, NULL); + if (r < 0) + return r; + } + + if (!arg_quiet) + log_info("Stopped unit %s%s%s for mount point: %s%s%s", + ansi_highlight(), mount_unit, ansi_normal(), + ansi_highlight(), where, ansi_normal()); + + return 0; +} + +static int stop_mounts( + sd_bus *bus, + const char *where) { + + int r; + + if (path_equal(where, "/")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Refusing to operate on root directory: %s", where); + + if (!path_is_normalized(where)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path contains non-normalized components: %s", where); + + r = stop_mount(bus, where, ".mount"); + if (r < 0) + return r; + + r = stop_mount(bus, where, ".automount"); + if (r < 0) + return r; + + return 0; +} + +static int umount_by_device(sd_bus *bus, sd_device *dev) { + _cleanup_strv_free_ char **list = NULL; + const char *v; + int r, ret = 0; + + assert(bus); + assert(dev); + + if (sd_device_get_property_value(dev, "SYSTEMD_MOUNT_WHERE", &v) >= 0) + ret = stop_mounts(bus, v); + + r = sd_device_get_devname(dev, &v); + if (r < 0) + return r; + + r = find_mount_points(v, &list); + if (r < 0) + return r; + + STRV_FOREACH(l, list) { + r = stop_mounts(bus, *l); + if (r < 0) + ret = r; + } + + return ret; +} + +static int umount_by_device_node(sd_bus *bus, const char *node) { + _cleanup_(sd_device_unrefp) sd_device *dev = NULL; + const char *v; + int r; + + assert(bus); + assert(node); + + r = sd_device_new_from_devname(&dev, node); + if (r < 0) + return log_error_errno(r, "Failed to get device from %s: %m", node); + + r = sd_device_get_property_value(dev, "ID_FS_USAGE", &v); + if (r < 0) + return log_device_error_errno(dev, r, "Failed to get \"ID_FS_USAGE\" device property: %m"); + + if (!streq(v, "filesystem")) + return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "%s does not contain a known file system.", node); + + return umount_by_device(bus, dev); +} + +static int umount_loop(sd_bus *bus, const char *backing_file) { + _cleanup_(sd_device_unrefp) sd_device *dev = NULL; + int r; + + assert(backing_file); + + r = find_loop_device(backing_file, &dev); + if (r < 0) + return log_error_errno(r, r == -ENXIO ? "File %s is not mounted." : "Can't get loop device for %s: %m", backing_file); + + return umount_by_device(bus, dev); +} + +static int action_umount( + sd_bus *bus, + int argc, + char **argv) { + + int r, r2 = 0; + + if (arg_transport != BUS_TRANSPORT_LOCAL) { + for (int i = optind; i < argc; i++) { + _cleanup_free_ char *p = NULL; + + r = path_simplify_alloc(argv[i], &p); + if (r < 0) + return r; + + r = stop_mounts(bus, p); + if (r < 0) + r2 = r; + } + return r2; + } + + for (int i = optind; i < argc; i++) { + _cleanup_free_ char *u = NULL, *p = NULL; + struct stat st; + + u = fstab_node_to_udev_node(argv[i]); + if (!u) + return log_oom(); + + r = chase(u, NULL, 0, &p, NULL); + if (r < 0) { + r2 = log_error_errno(r, "Failed to make path %s absolute: %m", argv[i]); + continue; + } + + if (stat(p, &st) < 0) + return log_error_errno(errno, "Can't stat %s (from %s): %m", p, argv[i]); + + if (S_ISBLK(st.st_mode)) + r = umount_by_device_node(bus, p); + else if (S_ISREG(st.st_mode)) + r = umount_loop(bus, p); + else if (S_ISDIR(st.st_mode)) + r = stop_mounts(bus, p); + else { + log_error("Invalid file type: %s (from %s)", p, argv[i]); + r = -EINVAL; + } + + if (r < 0) + r2 = r; + } + + return r2; +} + +static int acquire_mount_type(sd_device *d) { + const char *v; + + assert(d); + + if (arg_mount_type) + return 0; + + if (sd_device_get_property_value(d, "ID_FS_TYPE", &v) < 0) + return 0; + + arg_mount_type = strdup(v); + if (!arg_mount_type) + return log_oom(); + + log_debug("Discovered type=%s", arg_mount_type); + return 1; +} + +static int acquire_mount_options(sd_device *d) { + const char *v; + + assert(d); + + if (arg_mount_options) + return 0; + + if (sd_device_get_property_value(d, "SYSTEMD_MOUNT_OPTIONS", &v) < 0) + return 0; + + arg_mount_options = strdup(v); + if (!arg_mount_options) + return log_oom(); + + log_debug("Discovered options=%s", arg_mount_options); + return 1; +} + +static const char* get_label(sd_device *d) { + const char *label; + + assert(d); + + if (sd_device_get_property_value(d, "ID_FS_LABEL", &label) >= 0) + return label; + + if (sd_device_get_property_value(d, "ID_PART_ENTRY_NAME", &label) >= 0) + return label; + + return NULL; +} + +static int acquire_mount_where(sd_device *d) { + const char *v; + int r; + + if (arg_mount_where) + return 0; + + if (sd_device_get_property_value(d, "SYSTEMD_MOUNT_WHERE", &v) < 0) { + _cleanup_free_ char *escaped = NULL, *devname_bn = NULL; + const char *name; + + name = get_label(d); + if (!name) + (void) device_get_model_string(d, &name); + if (!name) { + const char *dn; + + if (sd_device_get_devname(d, &dn) < 0) + return 0; + + r = path_extract_filename(dn, &devname_bn); + if (r < 0) + return log_error_errno(r, "Failed to extract file name from '%s': %m", dn); + + name = devname_bn; + } + + escaped = xescape(name, "\\"); + if (!escaped) + return log_oom(); + if (!filename_is_valid(escaped)) + return 0; + + arg_mount_where = path_join("/run/media/system", escaped); + } else + arg_mount_where = strdup(v); + + if (!arg_mount_where) + return log_oom(); + + log_debug("Discovered where=%s", arg_mount_where); + return 1; +} + +static int acquire_mount_where_for_loop_dev(sd_device *dev) { + _cleanup_strv_free_ char **list = NULL; + const char *node; + int r; + + assert(dev); + + if (arg_mount_where) + return 0; + + r = sd_device_get_devname(dev, &node); + if (r < 0) + return r; + + r = find_mount_points(node, &list); + if (r < 0) + return r; + if (r == 0) + return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "Can't find mount point of %s. It is expected that %s is already mounted on a place.", + node, node); + if (r >= 2) + return log_device_error_errno(dev, SYNTHETIC_ERRNO(EINVAL), + "%s is mounted on %d places. It is expected that %s is mounted on a place.", + node, r, node); + + arg_mount_where = strdup(list[0]); + if (!arg_mount_where) + return log_oom(); + + log_debug("Discovered where=%s", arg_mount_where); + return 1; +} + +static int acquire_description(sd_device *d) { + const char *model = NULL, *label; + + if (arg_description) + return 0; + + (void) device_get_model_string(d, &model); + + label = get_label(d); + if (!label) + (void) sd_device_get_property_value(d, "ID_PART_ENTRY_NUMBER", &label); + + if (model && label) + arg_description = strjoin(model, " ", label); + else if (label) + arg_description = strdup(label); + else if (model) + arg_description = strdup(model); + else + return 0; + + if (!arg_description) + return log_oom(); + + log_debug("Discovered description=%s", arg_description); + return 1; +} + +static int acquire_removable(sd_device *d) { + const char *v; + + /* Shortcut this if there's no reason to check it */ + if (arg_action != ACTION_DEFAULT && arg_timeout_idle_set && arg_bind_device >= 0) + return 0; + + for (;;) { + if (sd_device_get_sysattr_value(d, "removable", &v) >= 0) + break; + + if (sd_device_get_parent(d, &d) < 0) + return 0; + + if (sd_device_get_subsystem(d, &v) < 0 || !streq(v, "block")) + return 0; + } + + if (parse_boolean(v) <= 0) + return 0; + + log_debug("Discovered removable device."); + + if (arg_action == ACTION_DEFAULT) { + log_debug("Automatically turning on automount."); + arg_action = ACTION_AUTOMOUNT; + } + + if (!arg_timeout_idle_set) { + log_debug("Setting idle timeout to 1s."); + arg_timeout_idle = USEC_PER_SEC; + } + + if (arg_bind_device < 0) { + log_debug("Binding automount unit to device."); + arg_bind_device = true; + } + + return 1; +} + +static int discover_loop_backing_file(void) { + _cleanup_(sd_device_unrefp) sd_device *d = NULL; + int r; + + r = find_loop_device(arg_mount_what, &d); + if (r < 0 && r != -ENXIO) + return log_error_errno(errno, "Can't get loop device for %s: %m", arg_mount_what); + + if (r == -ENXIO) { + _cleanup_free_ char *escaped = NULL, *bn = NULL; + + if (arg_mount_where) + return 0; + + r = path_extract_filename(arg_mount_what, &bn); + if (r < 0) + return log_error_errno(r, "Failed to extract file name from backing file path '%s': %m", arg_mount_what); + + escaped = xescape(bn, "\\"); + if (!escaped) + return log_oom(); + if (!filename_is_valid(escaped)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Escaped name %s is not a valid filename.", + escaped); + + arg_mount_where = path_join("/run/media/system", escaped); + if (!arg_mount_where) + return log_oom(); + + log_debug("Discovered where=%s", arg_mount_where); + return 0; + } + + r = acquire_mount_type(d); + if (r < 0) + return r; + + r = acquire_mount_options(d); + if (r < 0) + return r; + + r = acquire_mount_where_for_loop_dev(d); + if (r < 0) + return r; + + r = acquire_description(d); + if (r < 0) + return r; + + return 0; +} + +static int discover_device(void) { + _cleanup_(sd_device_unrefp) sd_device *d = NULL; + struct stat st; + const char *v; + int r; + + if (stat(arg_mount_what, &st) < 0) + return log_error_errno(errno, "Can't stat %s: %m", arg_mount_what); + + if (S_ISREG(st.st_mode)) + return discover_loop_backing_file(); + + if (!S_ISBLK(st.st_mode)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Invalid file type: %s", + arg_mount_what); + + r = sd_device_new_from_stat_rdev(&d, &st); + if (r < 0) + return log_error_errno(r, "Failed to get device from device number: %m"); + + if (sd_device_get_property_value(d, "ID_FS_USAGE", &v) < 0 || !streq(v, "filesystem")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "%s does not contain a known file system.", + arg_mount_what); + + r = acquire_mount_type(d); + if (r < 0) + return r; + + r = acquire_mount_options(d); + if (r < 0) + return r; + + r = acquire_mount_where(d); + if (r < 0) + return r; + + r = acquire_description(d); + if (r < 0) + return r; + + r = acquire_removable(d); + if (r < 0) + return r; + + return 0; +} + +static int list_devices(void) { + enum { + COLUMN_NODE, + COLUMN_PATH, + COLUMN_MODEL, + COLUMN_WWN, + COLUMN_FSTYPE, + COLUMN_LABEL, + COLUMN_UUID, + _COLUMN_MAX, + }; + + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + _cleanup_(table_unrefp) Table *table = NULL; + int r; + + r = sd_device_enumerator_new(&e); + if (r < 0) + return log_oom(); + + r = sd_device_enumerator_add_match_subsystem(e, "block", true); + if (r < 0) + return log_error_errno(r, "Failed to add block match: %m"); + + r = sd_device_enumerator_add_match_property(e, "ID_FS_USAGE", "filesystem"); + if (r < 0) + return log_error_errno(r, "Failed to add property match: %m"); + + table = table_new("NODE", "PATH", "MODEL", "WWN", "FSTYPE", "LABEL", "UUID"); + if (!table) + return log_oom(); + + if (arg_full) + table_set_width(table, 0); + + r = table_set_sort(table, (size_t) 0); + if (r < 0) + return log_error_errno(r, "Failed to set sort index: %m"); + + table_set_header(table, arg_legend); + table_set_ersatz_string(table, TABLE_ERSATZ_DASH); + + FOREACH_DEVICE(e, d) { + for (unsigned c = 0; c < _COLUMN_MAX; c++) { + const char *x = NULL; + + switch (c) { + + case COLUMN_NODE: + (void) sd_device_get_devname(d, &x); + break; + + case COLUMN_PATH: + (void) sd_device_get_property_value(d, "ID_PATH", &x); + break; + + case COLUMN_MODEL: + (void) device_get_model_string(d, &x); + break; + + case COLUMN_WWN: + (void) sd_device_get_property_value(d, "ID_WWN", &x); + break; + + case COLUMN_FSTYPE: + (void) sd_device_get_property_value(d, "ID_FS_TYPE", &x); + break; + + case COLUMN_LABEL: + x = get_label(d); + break; + + case COLUMN_UUID: + (void) sd_device_get_property_value(d, "ID_FS_UUID", &x); + break; + } + + r = table_add_cell(table, NULL, c == COLUMN_NODE ? TABLE_PATH : TABLE_STRING, x); + if (r < 0) + return table_log_add_error(r); + } + } + + pager_open(arg_pager_flags); + + r = table_print(table, NULL); + if (r < 0) + return table_log_print_error(r); + + return 0; +} + +static int run(int argc, char* argv[]) { + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + int r; + + log_show_color(true); + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + if (arg_action == ACTION_LIST) + return list_devices(); + + r = bus_connect_transport_systemd(arg_transport, arg_host, arg_runtime_scope, &bus); + if (r < 0) + return bus_log_connect_error(r, arg_transport); + + if (arg_action == ACTION_UMOUNT) + return action_umount(bus, argc, argv); + + if ((!arg_mount_type || fstype_is_blockdev_backed(arg_mount_type)) + && !path_is_normalized(arg_mount_what)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path contains non-normalized components: %s", + arg_mount_what); + + if (arg_discover) { + r = discover_device(); + if (r < 0) + return r; + } + + if (!arg_mount_where) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Can't figure out where to mount %s.", + arg_mount_what); + + if (path_equal(arg_mount_where, "/")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Refusing to operate on root directory."); + + if (!path_is_normalized(arg_mount_where)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Path contains non-normalized components: %s", + arg_mount_where); + + if (streq_ptr(arg_mount_type, "auto")) + arg_mount_type = mfree(arg_mount_type); + if (streq_ptr(arg_mount_options, "defaults")) + arg_mount_options = mfree(arg_mount_options); + + if (!is_device_path(arg_mount_what)) + arg_fsck = false; + + if (arg_fsck && arg_mount_type && arg_transport == BUS_TRANSPORT_LOCAL) { + r = fsck_exists_for_fstype(arg_mount_type); + if (r < 0) + log_warning_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", arg_mount_type); + else if (r == 0) { + log_debug("Disabling file system check as fsck for %s doesn't exist.", arg_mount_type); + arg_fsck = false; /* fsck doesn't exist, let's not attempt it */ + } + } + + /* The kernel (properly) refuses mounting file systems with unknown uid=,gid= options, + * but not for all filesystem types. Let's try to catch the cases where the option + * would be used if the file system does not support it. It is also possible to + * autodetect the file system, but that's only possible with disk-based file systems + * which incidentally seem to be implemented more carefully and reject unknown options, + * so it's probably OK that we do the check only when the type is specified. + */ + if (arg_mount_type && + !streq(arg_mount_type, "auto") && + arg_uid != UID_INVALID && + !fstype_can_uid_gid(arg_mount_type)) + return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "File system type %s is not known to support uid=/gid=, refusing.", + arg_mount_type); + + switch (arg_action) { + + case ACTION_MOUNT: + case ACTION_DEFAULT: + r = start_transient_mount(bus, argv + optind); + break; + + case ACTION_AUTOMOUNT: + r = start_transient_automount(bus, argv + optind); + break; + + default: + assert_not_reached(); + } + + return r; +} + +DEFINE_MAIN_FUNCTION(run); |