X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Ffstab-generator%2Ffstab-generator.c;h=32a8f9bd514685432f785619a1715b67e32d8b43;hp=d9ba3e32e2a9475e54304508948a2f01af6d6fc9;hb=9f03ee51a2207954ef18be79ca3e11cd14ca56fd;hpb=ec6ceb18663940efb1963704923430be0e83f1f7 diff --git a/src/fstab-generator/fstab-generator.c b/src/fstab-generator/fstab-generator.c index d9ba3e32e..32a8f9bd5 100644 --- a/src/fstab-generator/fstab-generator.c +++ b/src/fstab-generator/fstab-generator.c @@ -32,198 +32,212 @@ #include "mount-setup.h" #include "special.h" #include "mkdir.h" +#include "fileio.h" +#include "generator.h" +#include "strv.h" +#include "virt.h" static const char *arg_dest = "/tmp"; +static bool arg_fstab_enabled = true; +static char *arg_root_what = NULL; +static char *arg_root_fstype = NULL; +static char *arg_root_options = NULL; +static int arg_root_rw = -1; +static char *arg_usr_what = NULL; +static char *arg_usr_fstype = NULL; +static char *arg_usr_options = NULL; -static int device_name(const char *path, char **unit) { - char *p; - assert(path); +static int mount_find_pri(struct mntent *me, int *ret) { + char *end, *opt; + unsigned long r; + + assert(me); + assert(ret); - if (!is_device_path(path)) + opt = hasmntopt(me, "pri"); + if (!opt) return 0; - p = unit_name_from_path(path, ".device"); - if (!p) - return -ENOMEM; + opt += strlen("pri"); + + if (*opt != '=') + return -EINVAL; + + errno = 0; + r = strtoul(opt + 1, &end, 10); + if (errno > 0) + return -errno; - *unit = p; + if (end == opt + 1 || (*end != ',' && *end != 0)) + return -EINVAL; + + *ret = (int) r; return 1; } -static int mount_find_pri(struct mntent *me, int *ret) { - char *end, *pri; - unsigned long r; +static int mount_find_discard(struct mntent *me, char **ret) { + char *opt, *ans; + size_t len; assert(me); assert(ret); - pri = hasmntopt(me, "pri"); - if (!pri) + opt = hasmntopt(me, "discard"); + if (!opt) return 0; - pri += 4; + opt += strlen("discard"); - errno = 0; - r = strtoul(pri, &end, 10); - if (errno != 0) - return -errno; + if (*opt == ',' || *opt == '\0') + ans = strdup("all"); + else { + if (*opt != '=') + return -EINVAL; - if (end == pri || (*end != ',' && *end != 0)) - return -EINVAL; + len = strcspn(opt + 1, ","); + if (len == 0) + return -EINVAL; - *ret = (int) r; + ans = strndup(opt + 1, len); + } + + if (!ans) + return -ENOMEM; + + *ret = ans; return 1; } static int add_swap(const char *what, struct mntent *me) { - char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL; - FILE *f = NULL; - bool noauto, nofail; + _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; + _cleanup_fclose_ FILE *f = NULL; + _cleanup_free_ char *discard = NULL; + + bool noauto; int r, pri = -1; assert(what); assert(me); + if (detect_container(NULL) > 0) { + log_info("Running in a container, ignoring fstab swap entry for %s.", what); + return 0; + } + r = mount_find_pri(me, &pri); if (r < 0) { log_error("Failed to parse priority"); - return pri; + return r; + } + + r = mount_find_discard(me, &discard); + if (r < 0) { + log_error("Failed to parse discard"); + return r; } noauto = !!hasmntopt(me, "noauto"); - nofail = !!hasmntopt(me, "nofail"); name = unit_name_from_path(what, ".swap"); - if (!name) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (!name) + return log_oom(); - unit = join(arg_dest, "/", name, NULL); - if (!unit) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + unit = strjoin(arg_dest, "/", name, NULL); + if (!unit) + return log_oom(); f = fopen(unit, "wxe"); if (!f) { - r = -errno; - log_error("Failed to create unit file: %m"); - goto finish; + if (errno == EEXIST) + log_error("Failed to create swap unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit); + else + log_error("Failed to create unit file %s: %m", unit); + return -errno; } - fputs("# Automatically generated by systemd-fstab-generator\n\n" - "[Unit]\n" - "SourcePath=/etc/fstab\n" - "DefaultDependencies=no\n" - "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" - "Before=" SPECIAL_UMOUNT_TARGET "\n", f); - - if (!noauto && !nofail) - fputs("Before=" SPECIAL_SWAP_TARGET "\n", f); - fprintf(f, - "\n" + "# Automatically generated by systemd-fstab-generator\n\n" + "[Unit]\n" + "SourcePath=/etc/fstab\n" + "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n\n" "[Swap]\n" "What=%s\n", what); if (pri >= 0) - fprintf(f, - "Priority=%i\n", - pri); + fprintf(f, "Priority=%i\n", pri); + + if (discard) + fprintf(f, "Discard=%s\n", discard); fflush(f); if (ferror(f)) { - log_error("Failed to write unit file: %m"); - r = -errno; - goto finish; + log_error("Failed to write unit file %s: %m", unit); + return -errno; } + /* use what as where, to have a nicer error message */ + r = generator_write_timeouts(arg_dest, what, what, me->mnt_opts, NULL); + if (r < 0) + return r; + if (!noauto) { - lnk = join(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); - if (!lnk) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + lnk = strjoin(arg_dest, "/" SPECIAL_SWAP_TARGET ".wants/", name, NULL); + if (!lnk) + return log_oom(); mkdir_parents_label(lnk, 0755); if (symlink(unit, lnk) < 0) { - log_error("Failed to create symlink: %m"); - r = -errno; - goto finish; - } - - r = device_name(what, &device); - if (r < 0) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - if (r > 0) { - free(lnk); - lnk = join(arg_dest, "/", device, ".wants/", name, NULL); - if (!lnk) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - mkdir_parents_label(lnk, 0755); - if (symlink(unit, lnk) < 0) { - log_error("Failed to create symlink: %m"); - r = -errno; - goto finish; - } + log_error("Failed to create symlink %s: %m", lnk); + return -errno; } } - r = 0; -finish: - if (f) - fclose(f); - - free(unit); - free(lnk); - free(name); - free(device); - - return r; + return 0; } -static bool mount_is_bind(struct mntent *me) { +static bool mount_is_network(struct mntent *me) { assert(me); return - hasmntopt(me, "bind") || - streq(me->mnt_opts, "bind"); + hasmntopt(me, "_netdev") || + fstype_is_network(me->mnt_type); } -static bool mount_is_network(struct mntent *me) { +static bool mount_in_initrd(struct mntent *me) { assert(me); return - hasmntopt(me, "_netdev") || - fstype_is_network(me->mnt_type); + hasmntopt(me, "x-initrd.mount") || + streq(me->mnt_dir, "/usr"); } -static int add_mount(const char *what, const char *where, struct mntent *me) { - char *name = NULL, *unit = NULL, *lnk = NULL, *device = NULL, *automount_name = NULL, *automount_unit = NULL; - FILE *f = NULL; - bool noauto, nofail, automount, isbind, isnetwork; +static int add_mount( + const char *what, + const char *where, + const char *fstype, + const char *opts, + int passno, + bool noauto, + bool nofail, + bool automount, + const char *post, + const char *source) { + + _cleanup_free_ char + *name = NULL, *unit = NULL, *lnk = NULL, + *automount_name = NULL, *automount_unit = NULL, + *filtered = NULL; + _cleanup_fclose_ FILE *f = NULL; int r; - const char *post, *pre; assert(what); assert(where); - assert(me); + assert(opts); + assert(source); - if (streq(me->mnt_type, "autofs")) + if (streq_ptr(fstype, "autofs")) return 0; if (!is_path(where)) { @@ -235,241 +249,172 @@ static int add_mount(const char *what, const char *where, struct mntent *me) { mount_point_ignore(where)) return 0; - isnetwork = mount_is_network(me); - isbind = mount_is_bind(me); - - noauto = !!hasmntopt(me, "noauto"); - nofail = !!hasmntopt(me, "nofail"); - automount = - hasmntopt(me, "comment=systemd.automount") || - hasmntopt(me, "x-systemd.automount"); - - if (isnetwork) { - post = SPECIAL_REMOTE_FS_TARGET; - pre = SPECIAL_REMOTE_FS_PRE_TARGET; - } else { - post = SPECIAL_LOCAL_FS_TARGET; - pre = SPECIAL_LOCAL_FS_PRE_TARGET; + if (path_equal(where, "/")) { + /* The root disk is not an option */ + automount = false; + noauto = false; + nofail = false; } name = unit_name_from_path(where, ".mount"); - if (!name) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (!name) + return log_oom(); - unit = join(arg_dest, "/", name, NULL); - if (!unit) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + unit = strjoin(arg_dest, "/", name, NULL); + if (!unit) + return log_oom(); f = fopen(unit, "wxe"); if (!f) { - r = -errno; - log_error("Failed to create unit file: %m"); - goto finish; + if (errno == EEXIST) + log_error("Failed to create mount unit file %s, as it already exists. Duplicate entry in /etc/fstab?", unit); + else + log_error("Failed to create unit file %s: %m", unit); + return -errno; } - fputs("# Automatically generated by systemd-fstab-generator\n\n" - "[Unit]\n" - "SourcePath=/etc/fstab\n" - "DefaultDependencies=no\n", f); - - if (!path_equal(where, "/")) - fprintf(f, - "After=%s\n" - "Wants=%s\n" - "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" - "Before=" SPECIAL_UMOUNT_TARGET "\n", - pre, - pre); - - - if (!noauto && !nofail && !automount) - fprintf(f, - "Before=%s\n", - post); + fprintf(f, + "# Automatically generated by systemd-fstab-generator\n\n" + "[Unit]\n" + "SourcePath=%s\n" + "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n", + source); + + if (post && !noauto && !nofail && !automount) + fprintf(f, "Before=%s\n", post); + + if (passno != 0) { + r = generator_write_fsck_deps(f, arg_dest, what, where, fstype); + if (r < 0) + return r; + } fprintf(f, "\n" "[Mount]\n" "What=%s\n" - "Where=%s\n" - "Type=%s\n" - "FsckPassNo=%i\n", + "Where=%s\n", what, - where, - me->mnt_type, - me->mnt_passno); + where); - if (!isempty(me->mnt_opts) && - !streq(me->mnt_opts, "defaults")) - fprintf(f, - "Options=%s\n", - me->mnt_opts); + if (!isempty(fstype) && !streq(fstype, "auto")) + fprintf(f, "Type=%s\n", fstype); + + r = generator_write_timeouts(arg_dest, what, where, opts, &filtered); + if (r < 0) + return r; + + if (!isempty(filtered) && !streq(filtered, "defaults")) + fprintf(f, "Options=%s\n", filtered); fflush(f); if (ferror(f)) { - log_error("Failed to write unit file: %m"); - r = -errno; - goto finish; + log_error("Failed to write unit file %s: %m", unit); + return -errno; } - if (!noauto) { - lnk = join(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL); - if (!lnk) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (!noauto && post) { + lnk = strjoin(arg_dest, "/", post, nofail || automount ? ".wants/" : ".requires/", name, NULL); + if (!lnk) + return log_oom(); mkdir_parents_label(lnk, 0755); if (symlink(unit, lnk) < 0) { - log_error("Failed to create symlink: %m"); - r = -errno; - goto finish; - } - - if (!isbind && - !path_equal(where, "/")) { - - r = device_name(what, &device); - if (r < 0) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - if (r > 0) { - free(lnk); - lnk = join(arg_dest, "/", device, ".wants/", name, NULL); - if (!lnk) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } - - mkdir_parents_label(lnk, 0755); - if (symlink(unit, lnk) < 0) { - log_error("Failed to creat symlink: %m"); - r = -errno; - goto finish; - } - } + log_error("Failed to create symlink %s: %m", lnk); + return -errno; } } - if (automount && !path_equal(where, "/")) { + if (automount) { automount_name = unit_name_from_path(where, ".automount"); - if (!name) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (!automount_name) + return log_oom(); - automount_unit = join(arg_dest, "/", automount_name, NULL); - if (!automount_unit) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + automount_unit = strjoin(arg_dest, "/", automount_name, NULL); + if (!automount_unit) + return log_oom(); fclose(f); f = fopen(automount_unit, "wxe"); if (!f) { - r = -errno; - log_error("Failed to create unit file: %m"); - goto finish; + log_error("Failed to create unit file %s: %m", automount_unit); + return -errno; } fprintf(f, "# Automatically generated by systemd-fstab-generator\n\n" "[Unit]\n" - "SourcePath=/etc/fstab\n" - "DefaultDependencies=no\n" - "Conflicts=" SPECIAL_UMOUNT_TARGET "\n" - "Before=" SPECIAL_UMOUNT_TARGET " %s\n" - "\n" + "SourcePath=%s\n" + "Documentation=man:fstab(5) man:systemd-fstab-generator(8)\n", + source); + + if (post) + fprintf(f, + "Before=%s\n", + post); + + fprintf(f, "[Automount]\n" "Where=%s\n", - post, where); fflush(f); if (ferror(f)) { - log_error("Failed to write unit file: %m"); - r = -errno; - goto finish; + log_error("Failed to write unit file %s: %m", automount_unit); + return -errno; } free(lnk); - lnk = join(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL); - if (!lnk) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + lnk = strjoin(arg_dest, "/", post, nofail ? ".wants/" : ".requires/", automount_name, NULL); + if (!lnk) + return log_oom(); mkdir_parents_label(lnk, 0755); if (symlink(automount_unit, lnk) < 0) { - log_error("Failed to create symlink: %m"); - r = -errno; - goto finish; + log_error("Failed to create symlink %s: %m", lnk); + return -errno; } } - r = 0; -finish: - if (f) - fclose(f); - - free(unit); - free(lnk); - free(name); - free(device); - free(automount_name); - free(automount_unit); - - return r; + return 0; } -static int parse_fstab(void) { - FILE *f; - int r = 0; +static int parse_fstab(bool initrd) { + _cleanup_endmntent_ FILE *f = NULL; + const char *fstab_path; struct mntent *me; + int r = 0; - errno = 0; - f = setmntent("/etc/fstab", "r"); + fstab_path = initrd ? "/sysroot/etc/fstab" : "/etc/fstab"; + f = setmntent(fstab_path, "re"); if (!f) { if (errno == ENOENT) return 0; - log_error("Failed to open /etc/fstab: %m"); + log_error("Failed to open %s: %m", fstab_path); return -errno; } while ((me = getmntent(f))) { - char *where, *what; + _cleanup_free_ char *where = NULL, *what = NULL; int k; + if (initrd && !mount_in_initrd(me)) + continue; + what = fstab_node_to_udev_node(me->mnt_fsname); - if (!what) { - log_error("Out of memory"); - r = -ENOMEM; - goto finish; - } + if (!what) + return log_oom(); - where = strdup(me->mnt_dir); - if (!where) { - log_error("Out of memory"); - free(what); - r = -ENOMEM; - goto finish; + if (detect_container(NULL) > 0 && is_device_path(what)) { + log_info("Running in a container, ignoring fstab device entry for %s.", what); + continue; } + where = initrd ? strappend("/sysroot/", me->mnt_dir) : strdup(me->mnt_dir); + if (!where) + return log_oom(); + if (is_path(where)) path_kill_slashes(where); @@ -477,24 +422,203 @@ static int parse_fstab(void) { if (streq(me->mnt_type, "swap")) k = add_swap(what, me); - else - k = add_mount(what, where, me); - - free(what); - free(where); + else { + bool noauto, nofail, automount; + const char *post; + + noauto = !!hasmntopt(me, "noauto"); + nofail = !!hasmntopt(me, "nofail"); + automount = + hasmntopt(me, "comment=systemd.automount") || + hasmntopt(me, "x-systemd.automount"); + + if (initrd) + post = SPECIAL_INITRD_FS_TARGET; + else if (mount_in_initrd(me)) + post = SPECIAL_INITRD_ROOT_FS_TARGET; + else if (mount_is_network(me)) + post = SPECIAL_REMOTE_FS_TARGET; + else + post = SPECIAL_LOCAL_FS_TARGET; + + k = add_mount(what, + where, + me->mnt_type, + me->mnt_opts, + me->mnt_passno, + noauto, + nofail, + automount, + post, + fstab_path); + } if (k < 0) r = k; } -finish: - endmntent(f); return r; } -int main(int argc, char *argv[]) { +static int add_root_mount(void) { + _cleanup_free_ char *what = NULL; + const char *opts; + + if (isempty(arg_root_what)) { + log_debug("Could not find a root= entry on the kernel commandline."); + return 0; + } + + what = fstab_node_to_udev_node(arg_root_what); + if (!path_is_absolute(what)) { + log_debug("Skipping entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype)); + return 0; + } + + if (!arg_root_options) + opts = arg_root_rw > 0 ? "rw" : "ro"; + else if (arg_root_rw >= 0 || + (!mount_test_option(arg_root_options, "ro") && + !mount_test_option(arg_root_options, "rw"))) + opts = strappenda(arg_root_options, ",", arg_root_rw > 0 ? "rw" : "ro"); + else + opts = arg_root_options; + + log_debug("Found entry what=%s where=/sysroot type=%s", what, strna(arg_root_fstype)); + return add_mount(what, + "/sysroot", + arg_root_fstype, + opts, + 1, + false, + false, + false, + SPECIAL_INITRD_ROOT_FS_TARGET, + "/proc/cmdline"); +} + +static int add_usr_mount(void) { + _cleanup_free_ char *what = NULL; + const char *opts; + + if (!arg_usr_what && !arg_usr_fstype && !arg_usr_options) + return 0; + + if (arg_root_what && !arg_usr_what) { + arg_usr_what = strdup(arg_root_what); + + if (!arg_usr_what) + return log_oom(); + } + + if (arg_root_fstype && !arg_usr_fstype) { + arg_usr_fstype = strdup(arg_root_fstype); + + if (!arg_usr_fstype) + return log_oom(); + } + + if (arg_root_options && !arg_usr_options) { + arg_usr_options = strdup(arg_root_options); + + if (!arg_usr_options) + return log_oom(); + } + + if (!arg_usr_what || !arg_usr_options) + return 0; + + what = fstab_node_to_udev_node(arg_usr_what); + if (!path_is_absolute(what)) { + log_debug("Skipping entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype)); + return -1; + } + + opts = arg_usr_options; + + log_debug("Found entry what=%s where=/sysroot/usr type=%s", what, strna(arg_usr_fstype)); + return add_mount(what, + "/sysroot/usr", + arg_usr_fstype, + opts, + 1, + false, + false, + false, + SPECIAL_INITRD_ROOT_FS_TARGET, + "/proc/cmdline"); +} + +static int parse_proc_cmdline_item(const char *key, const char *value) { int r; + /* root=, usr=, usrfstype= and roofstype= may occur more than once, the last + * instance should take precedence. In the case of multiple rootflags= + * or usrflags= the arguments should be concatenated */ + + if (STR_IN_SET(key, "fstab", "rd.fstab") && value) { + + r = parse_boolean(value); + if (r < 0) + log_warning("Failed to parse fstab switch %s. Ignoring.", value); + else + arg_fstab_enabled = r; + + } else if (streq(key, "root") && value) { + + if (free_and_strdup(&arg_root_what, value) < 0) + return log_oom(); + + } else if (streq(key, "rootfstype") && value) { + + if (free_and_strdup(&arg_root_fstype, value) < 0) + return log_oom(); + + } else if (streq(key, "rootflags") && value) { + char *o; + + o = arg_root_options ? + strjoin(arg_root_options, ",", value, NULL) : + strdup(value); + if (!o) + return log_oom(); + + free(arg_root_options); + arg_root_options = o; + + } else if (streq(key, "mount.usr") && value) { + + if (free_and_strdup(&arg_usr_what, value) < 0) + return log_oom(); + + } else if (streq(key, "mount.usrfstype") && value) { + + if (free_and_strdup(&arg_usr_fstype, value) < 0) + return log_oom(); + + } else if (streq(key, "mount.usrflags") && value) { + char *o; + + o = arg_usr_options ? + strjoin(arg_usr_options, ",", value, NULL) : + strdup(value); + if (!o) + return log_oom(); + + free(arg_usr_options); + arg_usr_options = o; + + } else if (streq(key, "rw") && !value) + arg_root_rw = true; + else if (streq(key, "ro") && !value) + arg_root_rw = false; + + return 0; +} + +int main(int argc, char *argv[]) { + int r = 0; + if (argc > 1 && argc != 4) { log_error("This program takes three or no arguments."); return EXIT_FAILURE; @@ -509,7 +633,38 @@ int main(int argc, char *argv[]) { umask(0022); - r = parse_fstab(); + if (parse_proc_cmdline(parse_proc_cmdline_item) < 0) + return EXIT_FAILURE; + + /* Always honour root= and usr= in the kernel command line if we are in an initrd */ + if (in_initrd()) { + r = add_root_mount(); + if (r == 0) + r = add_usr_mount(); + } + + /* Honour /etc/fstab only when that's enabled */ + if (arg_fstab_enabled) { + int k; + + log_debug("Parsing /etc/fstab"); + + /* Parse the local /etc/fstab, possibly from the initrd */ + k = parse_fstab(false); + if (k < 0) + r = k; + + /* If running in the initrd also parse the /etc/fstab from the host */ + if (in_initrd()) { + log_debug("Parsing /sysroot/etc/fstab"); + + k = parse_fstab(true); + if (k < 0) + r = k; + } + } + + free(arg_root_what); return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; }