diff options
Diffstat (limited to 'src/gpt-auto-generator/gpt-auto-generator.c')
| -rw-r--r-- | src/gpt-auto-generator/gpt-auto-generator.c | 352 |
1 files changed, 183 insertions, 169 deletions
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c index e4ce48ca9b..67d0f2a5b9 100644 --- a/src/gpt-auto-generator/gpt-auto-generator.c +++ b/src/gpt-auto-generator/gpt-auto-generator.c @@ -51,86 +51,15 @@ static bool arg_root_enabled = true; static bool arg_root_rw = false; DEFINE_TRIVIAL_CLEANUP_FUNC(blkid_probe, blkid_free_probe); -#define _cleanup_blkid_freep_probe_ _cleanup_(blkid_free_probep) +#define _cleanup_blkid_free_probe_ _cleanup_(blkid_free_probep) -static int verify_gpt_partition(const char *node, sd_id128_t *type, unsigned *nr, char **fstype) { - _cleanup_blkid_freep_probe_ blkid_probe b = NULL; - const char *v; - int r; - - errno = 0; - b = blkid_new_probe_from_filename(node); - if (!b) - return errno != 0 ? -errno : -ENOMEM; - - blkid_probe_enable_superblocks(b, 1); - blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); - blkid_probe_enable_partitions(b, 1); - blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); - - errno = 0; - r = blkid_do_safeprobe(b); - if (r == -2 || r == 1) /* no result or uncertain */ - return -EBADSLT; - else if (r != 0) - return errno ? -errno : -EIO; - - errno = 0; - r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL); - if (r != 0) - /* return 0 if we're not on GPT */ - return errno ? -errno : 0; - - if (strcmp(v, "gpt") != 0) - return 0; - - if (type) { - errno = 0; - r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL); - if (r != 0) - return errno ? -errno : -EIO; - - r = sd_id128_from_string(v, type); - if (r < 0) - return r; - } - - if (nr) { - errno = 0; - r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL); - if (r != 0) - return errno ? -errno : -EIO; - - r = safe_atou(v, nr); - if (r < 0) - return r; - } - - - if (fstype) { - errno = 0; - r = blkid_probe_lookup_value(b, "TYPE", &v, NULL); - if (r != 0) - *fstype = NULL; - else { - char *fst; - - fst = strdup(v); - if (!fst) - return -ENOMEM; - - *fstype = fst; - } - } - - return 1; -} - -static int add_swap(const char *path, const char *fstype) { +static int add_swap(const char *path) { _cleanup_free_ char *name = NULL, *unit = NULL, *lnk = NULL; _cleanup_fclose_ FILE *f = NULL; - log_debug("Adding swap: %s %s", path, fstype); + assert(path); + + log_debug("Adding swap: %s", path); name = unit_name_from_path(path, ".swap"); if (!name) @@ -309,12 +238,6 @@ static int add_mount( assert(where); assert(description); - if (path_is_mount_point(where, true) <= 0 && - dir_is_empty(where) <= 0) { - log_debug("%s already populated, ignoring.", where); - return 0; - } - log_debug("Adding %s: %s %s", where, what, strna(fstype)); if (streq_ptr(fstype, "crypto_LUKS")) { @@ -389,20 +312,86 @@ static int add_mount( return 0; } -static int enumerate_partitions(struct udev *udev, dev_t dev) { +static int probe_and_add_mount( + const char *id, + const char *what, + const char *where, + const char *description, + const char *post) { + + _cleanup_blkid_free_probe_ blkid_probe b = NULL; + const char *fstype; + int r; + + assert(id); + assert(what); + assert(where); + assert(description); + + if (path_is_mount_point(where, true) <= 0 && + dir_is_empty(where) <= 0) { + log_debug("%s already populated, ignoring.", where); + return 0; + } + + /* Let's check the partition type here, so that we know + * whether to do LUKS magic. */ + + errno = 0; + b = blkid_new_probe_from_filename(what); + if (!b) { + if (errno == 0) + return log_oom(); + log_error("Failed to allocate prober: %m"); + return -errno; + } + + blkid_probe_enable_superblocks(b, 1); + blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); + + errno = 0; + r = blkid_do_safeprobe(b); + if (r == -2 || r == 1) /* no result or uncertain */ + return 0; + else if (r != 0) { + if (errno == 0) + errno = EIO; + log_error("Failed to probe %s: %m", what); + return -errno; + } + + blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); + + return add_mount( + id, + what, + where, + fstype, + NULL, + description, + post); +} + +static int enumerate_partitions(dev_t devnum) { + _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; _cleanup_udev_device_unref_ struct udev_device *d = NULL; - _cleanup_free_ char *home = NULL, *home_fstype = NULL, *srv = NULL, *srv_fstype = NULL; - unsigned home_nr = (unsigned) -1, srv_nr = (unsigned )-1; + _cleanup_blkid_free_probe_ blkid_probe b = NULL; + _cleanup_udev_unref_ struct udev *udev = NULL; + _cleanup_free_ char *home = NULL, *srv = NULL; struct udev_list_entry *first, *item; struct udev_device *parent = NULL; + const char *node, *pttype, *devtype; + int home_nr = -1, srv_nr = -1; + blkid_partlist pl; int r, k; + dev_t pn; - e = udev_enumerate_new(udev); - if (!e) + udev = udev_new(); + if (!udev) return log_oom(); - d = udev_device_new_from_devnum(udev, 'b', dev); + d = udev_device_new_from_devnum(udev, 'b', devnum); if (!d) return log_oom(); @@ -410,6 +399,79 @@ static int enumerate_partitions(struct udev *udev, dev_t dev) { if (!parent) return log_oom(); + /* Does it have a devtype? */ + devtype = udev_device_get_devtype(parent); + if (!devtype) + return 0; + + /* Is this a disk or a partition? We only care for disks... */ + if (!streq(devtype, "disk")) + return 0; + + /* Does it have a device node? */ + node = udev_device_get_devnode(parent); + if (!node) + return 0; + + log_debug("Root device %s.", node); + + pn = udev_device_get_devnum(parent); + if (major(pn) == 0) + return 0; + + errno = 0; + b = blkid_new_probe_from_filename(node); + if (!b) { + if (errno == 0) + return log_oom(); + + log_error("Failed allocate prober: %m"); + return -errno; + } + + blkid_probe_enable_superblocks(b, 1); + blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); + blkid_probe_enable_partitions(b, 1); + blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); + + errno = 0; + r = blkid_do_safeprobe(b); + if (r == -2 || r == 1) /* no result or uncertain */ + return 0; + else if (r != 0) { + if (errno == 0) + errno = EIO; + log_error("Failed to probe %s: %m", node); + return -errno; + } + + errno = 0; + r = blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); + if (r != 0) { + if (errno == 0) + errno = EIO; + log_error("Failed to determine partition table type of %s: %m", node); + return -errno; + } + + /* We only do this all for GPT... */ + if (!streq_ptr(pttype, "gpt")) + return 0; + + errno = 0; + pl = blkid_probe_get_partitions(b); + if (!pl) { + if (errno == 0) + return log_oom(); + + log_error("Failed to list of partitions of %s: %m", node); + return -errno; + } + + e = udev_enumerate_new(udev); + if (!e) + return log_oom(); + r = udev_enumerate_add_match_parent(e, parent); if (r < 0) return log_oom(); @@ -420,50 +482,55 @@ static int enumerate_partitions(struct udev *udev, dev_t dev) { r = udev_enumerate_scan_devices(e); if (r < 0) { - log_error("Failed to enumerate partitions on /dev/block/%u:%u: %s", major(dev), minor(dev), strerror(-r)); + log_error("Failed to enumerate partitions on %s: %s", node, strerror(-r)); return r; } - r = 0; - first = udev_enumerate_get_list_entry(e); udev_list_entry_foreach(item, first) { _cleanup_udev_device_unref_ struct udev_device *q; - _cleanup_free_ char *fstype = NULL; - const char *node = NULL; + const char *stype, *subnode; sd_id128_t type_id; - unsigned nr; + blkid_partition pp; + dev_t qn; + int nr; q = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); if (!q) - return log_oom(); + continue; - if (udev_device_get_devnum(q) == udev_device_get_devnum(d)) + qn = udev_device_get_devnum(q); + if (major(qn) == 0) continue; - if (udev_device_get_devnum(q) == udev_device_get_devnum(parent)) + if (qn == devnum) continue; - node = udev_device_get_devnode(q); - if (!node) - return log_oom(); + if (qn == pn) + continue; - k = verify_gpt_partition(node, &type_id, &nr, &fstype); - if (k < 0) { - /* skip child devices which are not detected properly */ - if (k == -EBADSLT) - continue; + subnode = udev_device_get_devnode(q); + if (!subnode) + continue; - log_error("Failed to verify GPT partition %s: %s", node, strerror(-k)); - r = k; + pp = blkid_partlist_devno_to_partition(pl, qn); + if (!pp) continue; - } - if (k == 0) + + nr = blkid_partition_get_partno(pp); + if (nr < 0) + continue; + + stype = blkid_partition_get_type_string(pp); + if (!stype) + continue; + + if (sd_id128_from_string(stype, &type_id) < 0) continue; if (sd_id128_equal(type_id, GPT_SWAP)) { - k = add_swap(node, fstype); + k = add_swap(subnode); if (k < 0) r = k; @@ -476,14 +543,10 @@ static int enumerate_partitions(struct udev *udev, dev_t dev) { home_nr = nr; free(home); - home = strdup(node); + home = strdup(subnode); if (!home) return log_oom(); - free(home_fstype); - home_fstype = fstype; - fstype = NULL; - } else if (sd_id128_equal(type_id, GPT_SRV)) { /* We only care for the first /srv partition */ @@ -496,21 +559,17 @@ static int enumerate_partitions(struct udev *udev, dev_t dev) { srv = strdup(node); if (!srv) return log_oom(); - - free(srv_fstype); - srv_fstype = fstype; - fstype = NULL; } } - if (home && home_fstype) { - k = add_mount("home", home, "/home", home_fstype, NULL, "Home Partition", SPECIAL_LOCAL_FS_TARGET); + if (home) { + k = probe_and_add_mount("home", home, "/home", "Home Partition", SPECIAL_LOCAL_FS_TARGET); if (k < 0) r = k; } - if (srv && srv_fstype) { - k = add_mount("srv", srv, "/srv", srv_fstype, NULL, "Server Data Partition", SPECIAL_LOCAL_FS_TARGET); + if (srv) { + k = probe_and_add_mount("srv", srv, "/srv", "Server Data Partition", SPECIAL_LOCAL_FS_TARGET); if (k < 0) r = k; } @@ -590,27 +649,6 @@ static int get_block_device(const char *path, dev_t *dev) { return 0; } -static int devno_to_devnode(struct udev *udev, dev_t devno, char **ret) { - _cleanup_udev_device_unref_ struct udev_device *d; - const char *t; - char *n; - - d = udev_device_new_from_devnum(udev, 'b', devno); - if (!d) - return log_oom(); - - t = udev_device_get_devnode(d); - if (!t) - return -ENODEV; - - n = strdup(t); - if (!n) - return -ENOMEM; - - *ret = n; - return 0; -} - static int parse_proc_cmdline_item(const char *key, const char *value) { int r; @@ -678,8 +716,6 @@ static int add_root_mount(void) { } static int add_mounts(void) { - _cleanup_udev_unref_ struct udev *udev = NULL; - _cleanup_free_ char *node = NULL; dev_t devno; int r; @@ -692,29 +728,7 @@ static int add_mounts(void) { return 0; } - udev = udev_new(); - if (!udev) - return log_oom(); - - r = devno_to_devnode(udev, devno, &node); - if (r < 0) { - log_error("Failed to determine block device node from major/minor: %s", strerror(-r)); - return r; - } - - log_debug("Root device %s.", node); - - r = verify_gpt_partition(node, NULL, NULL, NULL); - if (r < 0) { - log_error("Failed to verify GPT partition %s: %s", node, strerror(-r)); - return r; - } - if (r == 0) { - log_debug("Not a GPT disk, exiting."); - return 0; - } - - return enumerate_partitions(udev, devno); + return enumerate_partitions(devno); } int main(int argc, char *argv[]) { |