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lib/core: introduce two new object types for split xattrs 

This adds two new object types for storing xattrs separately from
content objects.

`.file-xattrs` are regular files storing xattrs content, encoded as
GVariant. Each object is keyed by the checksum of its content, allowing
for multiple references.

`.file-xattrs-link` are hardlinks which are associated to file objects.
Each object is keyed by the same checksum of the corresponding file
object. The target of the hardlink is an existing file-xattrs object.
In case of reaching the limit of too many links, this object could be
a plain file too.
This commit is contained in:
Luca BRUNO 2022-03-02 16:44:59 +00:00
parent 6ad4a3457f
commit 2c60f302f9
No known key found for this signature in database
GPG Key ID: A9834A2252078E4E
2 changed files with 16 additions and 2 deletions
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10
src/libostree/ostree-core.c
View File

@ -1228,6 +1228,10 @@ ostree_object_type_to_string (OstreeObjectType objtype)
return "commitmeta";
case OSTREE_OBJECT_TYPE_PAYLOAD_LINK:
return "payload-link";
case OSTREE_OBJECT_TYPE_FILE_XATTRS:
return "file-xattrs";
case OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK:
return "file-xattrs-link";
default:
g_assert_not_reached ();
return NULL;
@ -1257,6 +1261,10 @@ ostree_object_type_from_string (const char *str)
return OSTREE_OBJECT_TYPE_COMMIT_META;
else if (!strcmp (str, "payload-link"))
return OSTREE_OBJECT_TYPE_PAYLOAD_LINK;
else if (!strcmp (str, "file-xattrs"))
return OSTREE_OBJECT_TYPE_FILE_XATTRS;
else if (!strcmp (str, "file-xattrs-link"))
return OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK;
g_assert_not_reached ();
return 0;
}
@ -2141,6 +2149,8 @@ _ostree_validate_structureof_metadata (OstreeObjectType objtype,
/* TODO */
break;
case OSTREE_OBJECT_TYPE_FILE:
case OSTREE_OBJECT_TYPE_FILE_XATTRS:
case OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK:
g_assert_not_reached ();
break;
}

6
src/libostree/ostree-core.h
View File

@ -67,6 +67,8 @@ G_BEGIN_DECLS
* @OSTREE_OBJECT_TYPE_TOMBSTONE_COMMIT: Toplevel object, refers to a deleted commit
* @OSTREE_OBJECT_TYPE_COMMIT_META: Detached metadata for a commit
* @OSTREE_OBJECT_TYPE_PAYLOAD_LINK: Symlink to a .file given its checksum on the payload only.
* @OSTREE_OBJECT_TYPE_FILE_XATTRS: Detached xattrs content, for 'bare-split-xattrs' mode.
* @OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK: Hardlink to a .file-xattrs given the checksum of its .file object.
*
* Enumeration for core object types; %OSTREE_OBJECT_TYPE_FILE is for
* content, the other types are metadata.
@ -79,6 +81,8 @@ typedef enum {
OSTREE_OBJECT_TYPE_TOMBSTONE_COMMIT = 5, /* .commit-tombstone */
OSTREE_OBJECT_TYPE_COMMIT_META = 6, /* .commitmeta */
OSTREE_OBJECT_TYPE_PAYLOAD_LINK = 7, /* .payload-link */
OSTREE_OBJECT_TYPE_FILE_XATTRS = 8, /* .file-xattrs */
OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK = 9, /* .file-xattrs-link */
} OstreeObjectType;
/**
@ -94,7 +98,7 @@ typedef enum {
*
* Last valid object type; use this to validate ranges.
*/
#define OSTREE_OBJECT_TYPE_LAST OSTREE_OBJECT_TYPE_PAYLOAD_LINK
#define OSTREE_OBJECT_TYPE_LAST OSTREE_OBJECT_TYPE_FILE_XATTRS_LINK
/**
* OSTREE_DIRMETA_GVARIANT_FORMAT: