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- /*
- * dpkg - main program for package management
- * filesdb.h - management of database of files installed on system
- *
- * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
- * Copyright © 2008-2014 Guillem Jover <guillem@debian.org>
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- */
- #ifndef FILESDB_H
- #define FILESDB_H
- #include <dpkg/file.h>
- /*
- * Data structure here is as follows:
- *
- * For each package we have a ‘struct fileinlist *’, the head of a list of
- * files in that package. They are in ‘forwards’ order. Each entry has a
- * pointer to the ‘struct filenamenode’.
- *
- * The struct filenamenodes are in a hash table, indexed by name.
- * (This hash table is not visible to callers.)
- *
- * Each filenamenode has a (possibly empty) list of ‘struct filepackage’,
- * giving a list of the packages listing that filename.
- *
- * When we read files contained info about a particular package we set the
- * ‘files’ member of the clientdata struct to the appropriate thing. When
- * not yet set the files pointer is made to point to ‘fileslist_uninited’
- * (this is available only internally, within filesdb.c - the published
- * interface is ensure_*_available).
- */
- struct pkginfo;
- /**
- * Flags to findnamenode().
- */
- enum fnnflags {
- /** Do not need to copy filename. */
- fnn_nocopy = DPKG_BIT(0),
- /** findnamenode may return NULL. */
- fnn_nonew = DPKG_BIT(1),
- };
- enum filenamenode_flags {
- /** In the newconffiles list. */
- fnnf_new_conff = DPKG_BIT(0),
- /** In the new filesystem archive. */
- fnnf_new_inarchive = DPKG_BIT(1),
- /** In the old package's conffiles list. */
- fnnf_old_conff = DPKG_BIT(2),
- /** Obsolete conffile. */
- fnnf_obs_conff = DPKG_BIT(3),
- /** Must remove from other packages' lists. */
- fnnf_elide_other_lists = DPKG_BIT(4),
- /** >= 1 instance is a dir, cannot rename over. */
- fnnf_no_atomic_overwrite = DPKG_BIT(5),
- /** New file has been placed on the disk. */
- fnnf_placed_on_disk = DPKG_BIT(6),
- fnnf_deferred_fsync = DPKG_BIT(7),
- fnnf_deferred_rename = DPKG_BIT(8),
- /** Path being filtered. */
- fnnf_filtered = DPKG_BIT(9),
- };
- struct filenamenode {
- struct filenamenode *next;
- const char *name;
- struct pkg_list *packages;
- struct diversion *divert;
- /** We allow the administrator to override the owner, group and mode of
- * a file. If such an override is present we use that instead of the
- * stat information stored in the archive.
- *
- * This functionality used to be in the suidmanager package. */
- struct file_stat *statoverride;
- /*
- * Fields from here on are used by archives.c &c, and cleared by
- * filesdbinit.
- */
- /** Set to zero when a new node is created. */
- enum filenamenode_flags flags;
- /** Valid iff this namenode is in the newconffiles list. */
- const char *oldhash;
- /** Valid iff the file was unpacked and hashed on this run. */
- const char *newhash;
- struct stat *filestat;
- struct trigfileint *trig_interested;
- };
- struct fileinlist {
- struct fileinlist *next;
- struct filenamenode *namenode;
- };
- /**
- * Queue of filenamenode entries.
- */
- struct filenamenode_queue {
- struct fileinlist *head, **tail;
- };
- /**
- * When we deal with an ‘overridden’ file, every package except the
- * overriding one is considered to contain the other file instead. Both
- * files have entries in the filesdb database, and they refer to each other
- * via these diversion structures.
- *
- * The contested filename's filenamenode has an diversion entry with
- * useinstead set to point to the redirected filename's filenamenode; the
- * redirected filenamenode has camefrom set to the contested filenamenode.
- * Both sides' diversion entries will have pkg set to the package (if any)
- * which is allowed to use the contended filename.
- *
- * Packages that contain either version of the file will all refer to the
- * contested filenamenode in their per-file package lists (both in core and
- * on disk). References are redirected to the other filenamenode's filename
- * where appropriate.
- */
- struct diversion {
- struct filenamenode *useinstead;
- struct filenamenode *camefrom;
- struct pkgset *pkgset;
- /** The ‘contested’ halves are in this list for easy cleanup. */
- struct diversion *next;
- };
- struct filepackages_iterator;
- struct filepackages_iterator *filepackages_iter_new(struct filenamenode *fnn);
- struct pkginfo *filepackages_iter_next(struct filepackages_iterator *iter);
- void filepackages_iter_free(struct filepackages_iterator *iter);
- void filesdbinit(void);
- void files_db_reset(void);
- struct fileiterator;
- struct fileiterator *files_db_iter_new(void);
- struct filenamenode *files_db_iter_next(struct fileiterator *iter);
- void files_db_iter_free(struct fileiterator *iter);
- void ensure_package_clientdata(struct pkginfo *pkg);
- void ensure_diversions(void);
- enum statdb_parse_flags {
- STATDB_PARSE_NORMAL = 0,
- STATDB_PARSE_LAX = 1,
- };
- uid_t statdb_parse_uid(const char *str);
- gid_t statdb_parse_gid(const char *str);
- mode_t statdb_parse_mode(const char *str);
- void ensure_statoverrides(enum statdb_parse_flags flags);
- #define LISTFILE "list"
- #define HASHFILE "md5sums"
- void ensure_packagefiles_available(struct pkginfo *pkg);
- void ensure_allinstfiles_available(void);
- void ensure_allinstfiles_available_quiet(void);
- void note_must_reread_files_inpackage(struct pkginfo *pkg);
- struct filenamenode *findnamenode(const char *filename, enum fnnflags flags);
- void parse_filehash(struct pkginfo *pkg, struct pkgbin *pkgbin);
- void write_filelist_except(struct pkginfo *pkg, struct pkgbin *pkgbin,
- struct fileinlist *list, enum filenamenode_flags mask);
- void write_filehash_except(struct pkginfo *pkg, struct pkgbin *pkgbin,
- struct fileinlist *list, enum filenamenode_flags mask);
- struct reversefilelistiter { struct fileinlist *todo; };
- void reversefilelist_init(struct reversefilelistiter *iterptr, struct fileinlist *files);
- struct filenamenode *reversefilelist_next(struct reversefilelistiter *iterptr);
- void reversefilelist_abort(struct reversefilelistiter *iterptr);
- #endif /* FILESDB_H */
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