diff options
author | Lennart Poettering <lennart@poettering.net> | 2016-12-09 18:39:15 +0100 |
---|---|---|
committer | Lennart Poettering <lennart@poettering.net> | 2016-12-20 20:00:09 +0100 |
commit | 9b6deb03fcb358d6987ce86fcad08e2e290ee5d0 (patch) | |
tree | 04585a62a61a27df1de280a8aecef2ef485eb25d | |
parent | 6f4e2f97d738e720ae843cef67cf83e350aa7667 (diff) |
dissect: optionally, only look for GPT partition tables, nothing else
This is useful for reusing the dissector logic in the gpt-auto-discovery logic:
there we really don't want to use MBR or naked file systems as root device.
-rw-r--r-- | src/dissect/dissect.c | 2 | ||||
-rw-r--r-- | src/machine/image-dbus.c | 2 | ||||
-rw-r--r-- | src/nspawn/nspawn.c | 2 | ||||
-rw-r--r-- | src/shared/dissect-image.c | 89 | ||||
-rw-r--r-- | src/shared/dissect-image.h | 3 | ||||
-rw-r--r-- | src/test/test-dissect-image.c | 2 |
6 files changed, 54 insertions, 46 deletions
diff --git a/src/dissect/dissect.c b/src/dissect/dissect.c index f2f1e135ec..aa06894037 100644 --- a/src/dissect/dissect.c +++ b/src/dissect/dissect.c @@ -191,7 +191,7 @@ int main(int argc, char *argv[]) { goto finish; } - r = dissect_image(d->fd, arg_root_hash, arg_root_hash_size, &m); + r = dissect_image(d->fd, arg_root_hash, arg_root_hash_size, 0, &m); if (r == -ENOPKG) { log_error_errno(r, "Couldn't identify a suitable partition table or file system in %s.", arg_image); goto finish; diff --git a/src/machine/image-dbus.c b/src/machine/image-dbus.c index e2fb882393..2b168b267b 100644 --- a/src/machine/image-dbus.c +++ b/src/machine/image-dbus.c @@ -336,7 +336,7 @@ static int raw_image_get_os_release(Image *image, char ***ret, sd_bus_error *err if (r < 0) return sd_bus_error_set_errnof(error, r, "Failed to set up loop block device for %s: %m", image->path); - r = dissect_image(d->fd, NULL, 0, &m); + r = dissect_image(d->fd, NULL, 0, 0, &m); if (r == -ENOPKG) return sd_bus_error_set_errnof(error, r, "Disk image %s not understood: %m", image->path); if (r < 0) diff --git a/src/nspawn/nspawn.c b/src/nspawn/nspawn.c index dcc639f15c..2e879d7d7f 100644 --- a/src/nspawn/nspawn.c +++ b/src/nspawn/nspawn.c @@ -3743,7 +3743,7 @@ int main(int argc, char *argv[]) { goto finish; } - r = dissect_image(loop->fd, arg_root_hash, arg_root_hash_size, &dissected_image); + r = dissect_image(loop->fd, arg_root_hash, arg_root_hash_size, 0, &dissected_image); if (r == -ENOPKG) { log_error_errno(r, "Could not find a suitable file system or partition table in image: %s", arg_image); diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c index d3ba9b9dde..10d53eab45 100644 --- a/src/shared/dissect-image.c +++ b/src/shared/dissect-image.c @@ -84,7 +84,7 @@ not_found: #endif } -int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectedImage **ret) { +int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectImageFlags flags, DissectedImage **ret) { #ifdef HAVE_BLKID sd_id128_t root_uuid = SD_ID128_NULL, verity_uuid = SD_ID128_NULL; @@ -95,7 +95,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte _cleanup_blkid_free_probe_ blkid_probe b = NULL; _cleanup_udev_unref_ struct udev *udev = NULL; _cleanup_free_ char *generic_node = NULL; - const char *pttype = NULL, *usage = NULL; + const char *pttype = NULL; struct udev_list_entry *first, *item; blkid_partlist pl; int r, generic_nr; @@ -147,8 +147,12 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte return -errno; } - blkid_probe_enable_superblocks(b, 1); - blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); + if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { + /* Look for file system superblocks, unless we only shall look for GPT partition tables */ + blkid_probe_enable_superblocks(b, 1); + blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); + } + blkid_probe_enable_partitions(b, 1); blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); @@ -169,40 +173,44 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte if (!m) return -ENOMEM; - (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); - if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { - _cleanup_free_ char *t = NULL, *n = NULL; - const char *fstype = NULL; + if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { + const char *usage = NULL; - /* OK, we have found a file system, that's our root partition then. */ - (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); + (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); + if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { + _cleanup_free_ char *t = NULL, *n = NULL; + const char *fstype = NULL; - if (fstype) { - t = strdup(fstype); - if (!t) - return -ENOMEM; - } + /* OK, we have found a file system, that's our root partition then. */ + (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); - if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) - return -ENOMEM; + if (fstype) { + t = strdup(fstype); + if (!t) + return -ENOMEM; + } - m->partitions[PARTITION_ROOT] = (DissectedPartition) { - .found = true, - .rw = true, - .partno = -1, - .architecture = _ARCHITECTURE_INVALID, - .fstype = t, - .node = n, - }; + if (asprintf(&n, "/dev/block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) + return -ENOMEM; - t = n = NULL; + m->partitions[PARTITION_ROOT] = (DissectedPartition) { + .found = true, + .rw = true, + .partno = -1, + .architecture = _ARCHITECTURE_INVALID, + .fstype = t, + .node = n, + }; - m->encrypted = streq(fstype, "crypto_LUKS"); + t = n = NULL; - *ret = m; - m = NULL; + m->encrypted = streq(fstype, "crypto_LUKS"); - return 0; + *ret = m; + m = NULL; + + return 0; + } } (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); @@ -212,7 +220,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte is_gpt = streq_ptr(pttype, "gpt"); is_mbr = streq_ptr(pttype, "dos"); - if (!is_gpt && !is_mbr) + if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) return -ENOPKG; errno = 0; @@ -300,7 +308,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte first = udev_enumerate_get_list_entry(e); udev_list_entry_foreach(item, first) { _cleanup_udev_device_unref_ struct udev_device *q; - unsigned long long flags; + unsigned long long pflags; blkid_partition pp; const char *node; dev_t qn; @@ -325,7 +333,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte if (!pp) continue; - flags = blkid_partition_get_flags(pp); + pflags = blkid_partition_get_flags(pp); nr = blkid_partition_get_partno(pp); if (nr < 0) @@ -337,7 +345,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte sd_id128_t type_id, id; bool rw = true; - if (flags & GPT_FLAG_NO_AUTO) + if (pflags & GPT_FLAG_NO_AUTO) continue; sid = blkid_partition_get_uuid(pp); @@ -354,10 +362,10 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte if (sd_id128_equal(type_id, GPT_HOME)) { designator = PARTITION_HOME; - rw = !(flags & GPT_FLAG_READ_ONLY); + rw = !(pflags & GPT_FLAG_READ_ONLY); } else if (sd_id128_equal(type_id, GPT_SRV)) { designator = PARTITION_SRV; - rw = !(flags & GPT_FLAG_READ_ONLY); + rw = !(pflags & GPT_FLAG_READ_ONLY); } else if (sd_id128_equal(type_id, GPT_ESP)) { designator = PARTITION_ESP; fstype = "vfat"; @@ -371,7 +379,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte designator = PARTITION_ROOT; architecture = native_architecture(); - rw = !(flags & GPT_FLAG_READ_ONLY); + rw = !(pflags & GPT_FLAG_READ_ONLY); } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { m->can_verity = true; @@ -395,9 +403,8 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte designator = PARTITION_ROOT_SECONDARY; architecture = SECONDARY_ARCHITECTURE; - rw = !(flags & GPT_FLAG_READ_ONLY); + rw = !(pflags & GPT_FLAG_READ_ONLY); } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { - m->can_verity = true; /* Ignore verity unless root has is specified */ @@ -419,7 +426,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte multiple_generic = true; else { generic_nr = nr; - generic_rw = !(flags & GPT_FLAG_READ_ONLY); + generic_rw = !(pflags & GPT_FLAG_READ_ONLY); generic_node = strdup(node); if (!generic_node) return -ENOMEM; @@ -457,7 +464,7 @@ int dissect_image(int fd, const void *root_hash, size_t root_hash_size, Dissecte } else if (is_mbr) { - if (flags != 0x80) /* Bootable flag */ + if (pflags != 0x80) /* Bootable flag */ continue; if (blkid_partition_get_type(pp) != 0x83) /* Linux partition */ diff --git a/src/shared/dissect-image.h b/src/shared/dissect-image.h index 175ddd8ea0..b424dac665 100644 --- a/src/shared/dissect-image.h +++ b/src/shared/dissect-image.h @@ -67,6 +67,7 @@ typedef enum DissectImageFlags { DISSECT_IMAGE_DISCARD_ANY = DISSECT_IMAGE_DISCARD_ON_LOOP | DISSECT_IMAGE_DISCARD | DISSECT_IMAGE_DISCARD_ON_CRYPTO, + DISSECT_IMAGE_GPT_ONLY = 16, /* Only recognize images with GPT partition tables */ } DissectImageFlags; struct DissectedImage { @@ -76,7 +77,7 @@ struct DissectedImage { DissectedPartition partitions[_PARTITION_DESIGNATOR_MAX]; }; -int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectedImage **ret); +int dissect_image(int fd, const void *root_hash, size_t root_hash_size, DissectImageFlags flags, DissectedImage **ret); DissectedImage* dissected_image_unref(DissectedImage *m); DEFINE_TRIVIAL_CLEANUP_FUNC(DissectedImage*, dissected_image_unref); diff --git a/src/test/test-dissect-image.c b/src/test/test-dissect-image.c index 0512a15e88..ddaf3a0d8b 100644 --- a/src/test/test-dissect-image.c +++ b/src/test/test-dissect-image.c @@ -43,7 +43,7 @@ int main(int argc, char *argv[]) { return EXIT_FAILURE; } - r = dissect_image(d->fd, NULL, 0, &m); + r = dissect_image(d->fd, NULL, 0, 0, &m); if (r < 0) { log_error_errno(r, "Failed to dissect image: %m"); return EXIT_FAILURE; |