diff options
Diffstat (limited to 'lib/dpkg/db-fsys-digest.c')
| -rw-r--r-- | lib/dpkg/db-fsys-digest.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/lib/dpkg/db-fsys-digest.c b/lib/dpkg/db-fsys-digest.c new file mode 100644 index 0000000..5b32d91 --- /dev/null +++ b/lib/dpkg/db-fsys-digest.c @@ -0,0 +1,151 @@ +/* + * libdpkg - Debian packaging suite library routines + * db-fsys-digest.c - management of filesystem digests database + * + * Copyright © 2012-2014 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/>. + */ + +#include <config.h> +#include <compat.h> + +#include <sys/stat.h> + +#include <errno.h> +#include <string.h> +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> + +#include <dpkg/i18n.h> +#include <dpkg/dpkg.h> +#include <dpkg/dpkg-db.h> +#include <dpkg/debug.h> +#include <dpkg/fdio.h> +#include <dpkg/dir.h> +#include <dpkg/db-ctrl.h> +#include <dpkg/db-fsys.h> + +/* + * If mask is nonzero, will not write any file whose fsys_namenode + * has any flag bits set in mask. + */ +void +write_filehash_except(struct pkginfo *pkg, struct pkgbin *pkgbin, + struct fsys_namenode_list *list, enum fsys_namenode_flags mask) +{ + struct atomic_file *file; + const char *hashfile; + + debug(dbg_general, "generating infodb hashfile"); + + if (pkg_infodb_has_file(pkg, &pkg->available, HASHFILE)) + return; + + hashfile = pkg_infodb_get_file(pkg, pkgbin, HASHFILE); + + file = atomic_file_new(hashfile, 0); + atomic_file_open(file); + + for (; list; list = list->next) { + struct fsys_namenode *namenode = list->namenode; + + if (mask && (namenode->flags & mask)) + continue; + if (strcmp(namenode->newhash, EMPTYHASHFLAG) == 0) + continue; + + fprintf(file->fp, "%s %s\n", + namenode->newhash, namenode->name + 1); + } + + atomic_file_sync(file); + atomic_file_close(file); + atomic_file_commit(file); + atomic_file_free(file); + + dir_sync_path(pkg_infodb_get_dir()); +} + +static void +parse_filehash_buffer(struct varbuf *buf, + struct pkginfo *pkg, struct pkgbin *pkgbin) +{ + char *thisline, *nextline; + const char *pkgname = pkg_name(pkg, pnaw_nonambig); + const char *buf_end = buf->buf + buf->used; + + for (thisline = buf->buf; thisline < buf_end; thisline = nextline) { + struct fsys_namenode *namenode; + char *endline, *hash_end, *filename; + + endline = memchr(thisline, '\n', buf_end - thisline); + if (endline == NULL) + ohshit(_("control file '%s' for package '%s' is " + "missing final newline"), HASHFILE, pkgname); + + /* The md5sum hash has a constant length. */ + hash_end = thisline + MD5HASHLEN; + + filename = hash_end + 2; + if (filename + 1 > endline) + ohshit(_("control file '%s' for package '%s' is " + "missing value"), HASHFILE, pkgname); + + if (hash_end[0] != ' ' || hash_end[1] != ' ') + ohshit(_("control file '%s' for package '%s' is " + "missing value separator"), HASHFILE, pkgname); + hash_end[0] = '\0'; + + /* Where to start next time around. */ + nextline = endline + 1; + + /* Strip trailing ‘/’. */ + if (endline > thisline && endline[-1] == '/') + endline--; + *endline = '\0'; + + if (endline == thisline) + ohshit(_("control file '%s' for package '%s' " + "contains empty filename"), HASHFILE, pkgname); + + debug(dbg_eachfiledetail, "load hash '%s' for filename '%s'", + thisline, filename); + + /* Add the file to the list. */ + namenode = fsys_hash_find_node(filename, 0); + namenode->newhash = nfstrsave(thisline); + } +} + +void +parse_filehash(struct pkginfo *pkg, struct pkgbin *pkgbin) +{ + const char *hashfile; + struct varbuf buf = VARBUF_INIT; + struct dpkg_error err = DPKG_ERROR_INIT; + + hashfile = pkg_infodb_get_file(pkg, pkgbin, HASHFILE); + + if (file_slurp(hashfile, &buf, &err) < 0 && err.syserrno != ENOENT) + dpkg_error_print(&err, + _("loading control file '%s' for package '%s'"), + HASHFILE, pkg_name(pkg, pnaw_nonambig)); + + if (buf.used > 0) + parse_filehash_buffer(&buf, pkg, pkgbin); + + varbuf_destroy(&buf); +} |