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repart: Extend squashfs logic to all read-only filesystems

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The same logic will apply to every read-only filesystem that we
might add support for in the future, so let's make this a bit more
future proof.
This commit is contained in:
Daan De Meyer 2022-09-22 21:28:58 +02:00
parent c9d65b921b
commit eb43379cec
3 changed files with 19 additions and 15 deletions
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20
src/partition/repart.c
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@ -3306,12 +3306,12 @@ static int partition_populate_directory(Partition *p, char **ret_root, char **re
assert(ret_root);
assert(ret_tmp_root);
/* When generating squashfs, we need the source tree to be available when we generate the squashfs
* filesystem. Because we might have multiple source trees, we build a temporary source tree
* beforehand where we merge all our inputs. We then use this merged source tree to create the
* squashfs filesystem. */
/* When generating read-only filesystems, we need the source tree to be available when we generate
* the read-only filesystem. Because we might have multiple source trees, we build a temporary source
* tree beforehand where we merge all our inputs. We then use this merged source tree to create the
* read-only filesystem. */
if (!streq(p->format, "squashfs")) {
if (!fstype_is_ro(p->format)) {
*ret_root = NULL;
*ret_tmp_root = NULL;
return 0;
@ -3357,7 +3357,7 @@ static int partition_populate_filesystem(Partition *p, const char *node) {
assert(p);
assert(node);
if (streq(p->format, "squashfs"))
if (fstype_is_ro(p->format))
return 0;
if (strv_isempty(p->copy_files) && strv_isempty(p->make_directories))
@ -3464,9 +3464,9 @@ static int context_mkfs(Context *context) {
/* Ideally, we populate filesystems using our own code after creating the filesystem to
* ensure consistent handling of chattrs, xattrs and other similar things. However, when
* using squashfs, we can't populate after creating the filesystem because it's read-only, so
* instead we create a temporary root to use as the source tree when generating the squashfs
* filesystem. */
* using read-only filesystems such as squashfs, we can't populate after creating the
* filesystem because it's read-only, so instead we create a temporary root to use as the
* source tree when generating the read-only filesystem. */
r = partition_populate_directory(p, &root, &tmp_root);
if (r < 0)
return r;
@ -3485,7 +3485,7 @@ static int context_mkfs(Context *context) {
if (flock(encrypted_dev_fd, LOCK_UN) < 0)
return log_error_errno(errno, "Failed to unlock LUKS device: %m");
/* Now, we can populate all the other filesystems that aren't squashfs. */
/* Now, we can populate all the other filesystems that aren't read-only. */
r = partition_populate_filesystem(p, fsdev);
if (r < 0) {
encrypted_dev_fd = safe_close(encrypted_dev_fd);

12
src/shared/mkfs-util.c
View File

@ -4,6 +4,7 @@
#include "id128-util.h"
#include "mkfs-util.h"
#include "mountpoint-util.h"
#include "path-util.h"
#include "process-util.h"
#include "stdio-util.h"
@ -102,6 +103,11 @@ int make_filesystem(
assert(fstype);
assert(label);
if (fstype_is_ro(fstype) && !root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Cannot generate read-only filesystem %s without a source tree.",
fstype);
if (streq(fstype, "swap")) {
if (root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
@ -112,10 +118,6 @@ int make_filesystem(
if (r < 0)
return log_error_errno(r, "Failed to determine whether mkswap binary exists: %m");
} else if (streq(fstype, "squashfs")) {
if (!root)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Cannot generate squashfs filesystems without a source tree.");
r = find_executable("mksquashfs", &mkfs);
if (r == -ENOENT)
return log_error_errno(SYNTHETIC_ERRNO(EPROTONOSUPPORT), "mksquashfs binary not available.");
@ -124,7 +126,7 @@ int make_filesystem(
} else {
if (root)
return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP),
"Populating with source tree is only supported for squashfs");
"Populating with source tree is only supported for read-only filesystems");
r = mkfs_exists(fstype);
if (r < 0)
return log_error_errno(r, "Failed to determine whether mkfs binary for %s exists: %m", fstype);

2
src/shared/mkfs-util.h
View File

@ -5,6 +5,8 @@
#include "sd-id128.h"
#include "strv.h"
int mkfs_exists(const char *fstype);
int make_filesystem(const char *node, const char *fstype, const char *label, const char *root, sd_id128_t uuid, bool discard);