diff options
Diffstat (limited to '')
| -rw-r--r-- | src/unpack.c | 1599 |
1 files changed, 1599 insertions, 0 deletions
diff --git a/src/unpack.c b/src/unpack.c new file mode 100644 index 0000000..ee453a8 --- /dev/null +++ b/src/unpack.c @@ -0,0 +1,1599 @@ +/* + * dpkg - main program for package management + * unpack.c - .deb archive unpacking + * + * Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk> + * Copyright © 2006-2015 Guillem Jover <guillem@debian.org> + * Copyright © 2011 Linaro Limited + * Copyright © 2011 Raphaël Hertzog <hertzog@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/types.h> +#include <sys/stat.h> +#include <sys/wait.h> + +#include <errno.h> +#include <string.h> +#include <time.h> +#include <utime.h> +#include <fcntl.h> +#include <dirent.h> +#include <unistd.h> +#include <stdint.h> +#include <stdlib.h> +#include <stdio.h> + +#include <dpkg/i18n.h> +#include <dpkg/c-ctype.h> +#include <dpkg/dpkg.h> +#include <dpkg/dpkg-db.h> +#include <dpkg/pkg.h> +#include <dpkg/pkg-queue.h> +#include <dpkg/path.h> +#include <dpkg/buffer.h> +#include <dpkg/subproc.h> +#include <dpkg/dir.h> +#include <dpkg/tarfn.h> +#include <dpkg/options.h> +#include <dpkg/db-ctrl.h> +#include <dpkg/db-fsys.h> +#include <dpkg/triglib.h> + +#include "file-match.h" +#include "main.h" +#include "archives.h" + +static const char * +summarize_filename(const char *filename) +{ + const char *pfilename; + char *pfilenamebuf; + + for (pfilename = filename; + pfilename && strlen(pfilename) > 30 && strchr(pfilename, '/') != NULL; + pfilename++) + pfilename = strchr(pfilename, '/'); + + if (pfilename && pfilename != filename) { + pfilenamebuf = nfmalloc(strlen(pfilename) + 5); + sprintf(pfilenamebuf, _(".../%s"), pfilename); + pfilename = pfilenamebuf; + } else { + pfilename = filename; + } + + return pfilename; +} + +static bool +deb_reassemble(const char **filename, const char **pfilename) +{ + static char *reasmbuf = NULL; + struct stat stab; + int status; + pid_t pid; + + if (!reasmbuf) + reasmbuf = dpkg_db_get_path(REASSEMBLETMP); + if (unlink(reasmbuf) && errno != ENOENT) + ohshite(_("error ensuring '%.250s' doesn't exist"), reasmbuf); + + push_cleanup(cu_pathname, ~0, 1, (void *)reasmbuf); + + pid = subproc_fork(); + if (!pid) { + execlp(SPLITTER, SPLITTER, "-Qao", reasmbuf, *filename, NULL); + ohshite(_("unable to execute %s (%s)"), + _("split package reassembly"), SPLITTER); + } + status = subproc_reap(pid, SPLITTER, SUBPROC_RETERROR); + switch (status) { + case 0: + /* It was a part - is it complete? */ + if (!stat(reasmbuf, &stab)) { + /* Yes. */ + *filename = reasmbuf; + *pfilename = _("reassembled package file"); + break; + } else if (errno == ENOENT) { + /* No. That's it, we skip it. */ + return false; + } + case 1: + /* No, it wasn't a part. */ + break; + default: + ohshit(_("subprocess %s returned error exit status %d"), SPLITTER, status); + } + + return true; +} + +static void +deb_verify(const char *filename) +{ + pid_t pid; + + /* We have to check on every unpack, in case the debsig-verify package + * gets installed or removed. */ + if (!find_command(DEBSIGVERIFY)) + return; + + printf(_("Authenticating %s ...\n"), filename); + fflush(stdout); + pid = subproc_fork(); + if (!pid) { + execlp(DEBSIGVERIFY, DEBSIGVERIFY, "-q", filename, NULL); + ohshite(_("unable to execute %s (%s)"), + _("package signature verification"), DEBSIGVERIFY); + } else { + int status; + + status = subproc_reap(pid, "debsig-verify", SUBPROC_NOCHECK); + if (!(WIFEXITED(status) && WEXITSTATUS(status) == 0)) { + if (!in_force(FORCE_BAD_VERIFY)) + ohshit(_("verification on package %s failed!"), filename); + else + notice(_("verification on package %s failed; " + "but installing anyway as you requested"), filename); + } else { + printf(_("passed\n")); + } + } +} + +static char * +get_control_dir(char *cidir) +{ + if (f_noact) { + char *tmpdir; + + tmpdir = mkdtemp(path_make_temp_template("dpkg")); + if (tmpdir == NULL) + ohshite(_("unable to create temporary directory")); + + cidir = m_realloc(cidir, strlen(tmpdir) + MAXCONTROLFILENAME + 10); + + strcpy(cidir, tmpdir); + + free(tmpdir); + } else { + const char *admindir; + + admindir = dpkg_db_get_dir(); + + /* The admindir length is always constant on a dpkg execution run. */ + if (cidir == NULL) + cidir = m_malloc(strlen(admindir) + sizeof(CONTROLDIRTMP) + + MAXCONTROLFILENAME + 10); + + /* We want it to be on the same filesystem so that we can + * use rename(2) to install the postinst &c. */ + strcpy(cidir, admindir); + strcat(cidir, "/" CONTROLDIRTMP); + + /* Make sure the control information directory is empty. */ + path_remove_tree(cidir); + } + + strcat(cidir, "/"); + + return cidir; +} + +static void +pkg_check_depcon(struct pkginfo *pkg, const char *pfilename) +{ + struct dependency *dsearch; + struct deppossi *psearch; + struct pkginfo *fixbytrigaw; + static struct varbuf depprobwhy; + + /* Check if anything is installed that we conflict with, or not installed + * that we need. */ + ensure_package_clientdata(pkg); + pkg->clientdata->istobe = PKG_ISTOBE_INSTALLNEW; + + for (dsearch = pkg->available.depends; dsearch; dsearch = dsearch->next) { + switch (dsearch->type) { + case dep_conflicts: + /* Look for things we conflict with. */ + check_conflict(dsearch, pkg, pfilename); + break; + case dep_breaks: + /* Look for things we break. */ + check_breaks(dsearch, pkg, pfilename); + break; + case dep_provides: + /* Look for things that conflict with what we provide. */ + for (psearch = dsearch->list->ed->depended.installed; + psearch; + psearch = psearch->rev_next) { + if (psearch->up->type != dep_conflicts) + continue; + check_conflict(psearch->up, pkg, pfilename); + } + break; + case dep_suggests: + case dep_recommends: + case dep_depends: + case dep_replaces: + case dep_enhances: + /* Ignore these here. */ + break; + case dep_predepends: + if (!depisok(dsearch, &depprobwhy, NULL, &fixbytrigaw, true)) { + if (fixbytrigaw) { + while (fixbytrigaw->trigaw.head) + trigproc(fixbytrigaw->trigaw.head->pend, TRIGPROC_REQUIRED); + } else { + varbuf_end_str(&depprobwhy); + notice(_("regarding %s containing %s, pre-dependency problem:\n%s"), + pfilename, pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + depprobwhy.buf); + if (!force_depends(dsearch->list)) + ohshit(_("pre-dependency problem - not installing %.250s"), + pkgbin_name(pkg, &pkg->available, pnaw_nonambig)); + warning(_("ignoring pre-dependency problem!")); + } + } + } + } + + /* Look for things that conflict with us. */ + for (psearch = pkg->set->depended.installed; psearch; psearch = psearch->rev_next) { + if (psearch->up->type != dep_conflicts) + continue; + + check_conflict(psearch->up, pkg, pfilename); + } +} + +static void +pkg_deconfigure_others(struct pkginfo *pkg) +{ + struct pkg_deconf_list *deconpil; + + for (deconpil = deconfigure; deconpil; deconpil = deconpil->next) { + struct pkginfo *removing = deconpil->pkg_removal; + + if (removing) + printf(_("De-configuring %s (%s), to allow removal of %s (%s) ...\n"), + pkg_name(deconpil->pkg, pnaw_nonambig), + versiondescribe(&deconpil->pkg->installed.version, vdew_nonambig), + pkg_name(removing, pnaw_nonambig), + versiondescribe(&removing->installed.version, vdew_nonambig)); + else + printf(_("De-configuring %s (%s) ...\n"), + pkg_name(deconpil->pkg, pnaw_nonambig), + versiondescribe(&deconpil->pkg->installed.version, vdew_nonambig)); + + trig_activate_packageprocessing(deconpil->pkg); + pkg_set_status(deconpil->pkg, PKG_STAT_HALFCONFIGURED); + modstatdb_note(deconpil->pkg); + + /* This means that we *either* go and run postinst abort-deconfigure, + * *or* queue the package for later configure processing, depending + * on which error cleanup route gets taken. */ + push_cleanup_fallback(cu_prermdeconfigure, ~ehflag_normaltidy, + ok_prermdeconfigure, ehflag_normaltidy, + 3, (void *)deconpil->pkg, (void *)removing, (void *)pkg); + + if (removing) { + maintscript_installed(deconpil->pkg, PRERMFILE, "pre-removal", + "deconfigure", "in-favour", + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + versiondescribe(&pkg->available.version, + vdew_nonambig), + "removing", + pkg_name(removing, pnaw_nonambig), + versiondescribe(&removing->installed.version, + vdew_nonambig), + NULL); + } else { + maintscript_installed(deconpil->pkg, PRERMFILE, "pre-removal", + "deconfigure", "in-favour", + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + versiondescribe(&pkg->available.version, + vdew_nonambig), + NULL); + } + } +} + +/** + * Read the conffiles, and copy the hashes across. + */ +static void +deb_parse_conffiles(struct pkginfo *pkg, const char *control_conffiles, + struct fsys_namenode_queue *newconffiles) +{ + FILE *conff; + char conffilenamebuf[MAXCONFFILENAME]; + + conff = fopen(control_conffiles, "r"); + if (conff == NULL) { + if (errno == ENOENT) + return; + ohshite(_("error trying to open %.250s"), control_conffiles); + } + + push_cleanup(cu_closestream, ehflag_bombout, 1, conff); + + while (fgets(conffilenamebuf, MAXCONFFILENAME - 2, conff)) { + struct pkginfo *otherpkg; + struct fsys_node_pkgs_iter *iter; + struct fsys_namenode *namenode; + struct fsys_namenode_list *newconff; + struct conffile *searchconff; + char *p; + + p = conffilenamebuf + strlen(conffilenamebuf); + if (p == conffilenamebuf) + ohshit(_("conffile file contains an empty line")); + if (p[-1] != '\n') + ohshit(_("conffile name '%s' is too long, or missing final newline"), + conffilenamebuf); + while (p > conffilenamebuf && c_isspace(p[-1])) + --p; + if (p == conffilenamebuf) + continue; + *p = '\0'; + + namenode = fsys_hash_find_node(conffilenamebuf, 0); + namenode->oldhash = NEWCONFFILEFLAG; + newconff = tar_fsys_namenode_queue_push(newconffiles, namenode); + + /* + * Let's see if any packages have this file. + * + * If they do we check to see if they listed it as a conffile, + * and if they did we copy the hash across. Since (for plain + * file conffiles, which is the only kind we are supposed to + * have) there will only be one package which ‘has’ the file, + * this will usually mean we only look in the package which + * we are installing now. + * + * The ‘conffiles’ data in the status file is ignored when a + * package is not also listed in the file ownership database as + * having that file. If several packages are listed as owning + * the file we pick one at random. + */ + searchconff = NULL; + + iter = fsys_node_pkgs_iter_new(newconff->namenode); + while ((otherpkg = fsys_node_pkgs_iter_next(iter))) { + debug(dbg_conffdetail, + "process_archive conffile '%s' in package %s - conff ?", + newconff->namenode->name, pkg_name(otherpkg, pnaw_always)); + for (searchconff = otherpkg->installed.conffiles; + searchconff && strcmp(newconff->namenode->name, searchconff->name); + searchconff = searchconff->next) + debug(dbg_conffdetail, + "process_archive conffile '%s' in package %s - conff ? not '%s'", + newconff->namenode->name, pkg_name(otherpkg, pnaw_always), + searchconff->name); + if (searchconff) { + debug(dbg_conff, + "process_archive conffile '%s' package=%s %s hash=%s", + newconff->namenode->name, pkg_name(otherpkg, pnaw_always), + otherpkg == pkg ? "same" : "different!", + searchconff->hash); + if (otherpkg == pkg) + break; + } + } + fsys_node_pkgs_iter_free(iter); + + if (searchconff) { + /* We don't copy ‘obsolete’; it's not obsolete in the new package. */ + newconff->namenode->oldhash = searchconff->hash; + } else { + debug(dbg_conff, "process_archive conffile '%s' no package, no hash", + newconff->namenode->name); + } + newconff->namenode->flags |= FNNF_NEW_CONFF; + } + + if (ferror(conff)) + ohshite(_("read error in %.250s"), control_conffiles); + pop_cleanup(ehflag_normaltidy); /* conff = fopen() */ + if (fclose(conff)) + ohshite(_("error closing %.250s"), control_conffiles); +} + +static struct pkg_queue conflictors = PKG_QUEUE_INIT; + +void +enqueue_conflictor(struct pkginfo *pkg) +{ + pkg_queue_push(&conflictors, pkg); +} + +static void +pkg_infodb_remove_file(const char *filename, const char *filetype) +{ + if (unlink(filename)) + ohshite(_("unable to delete control info file '%.250s'"), filename); + + debug(dbg_scripts, "removal_bulk info unlinked %s", filename); +} + +static struct match_node *match_head = NULL; + +static void +pkg_infodb_update_file(const char *filename, const char *filetype) +{ + if (strlen(filetype) > MAXCONTROLFILENAME) + ohshit(_("old version of package has overly-long info file name starting '%.250s'"), + filename); + + /* We do the list separately. */ + if (strcmp(filetype, LISTFILE) == 0) + return; + + /* We keep files to rename in a list as doing the rename immediately + * might influence the current readdir(), the just renamed file might + * be returned a second time as it's actually a new file from the + * point of view of the filesystem. */ + match_head = match_node_new(filename, filetype, match_head); +} + +static void +pkg_infodb_update(struct pkginfo *pkg, char *cidir, char *cidirrest) +{ + struct match_node *match_node; + DIR *dsd; + struct dirent *de; + + /* Deallocate the match list in case we aborted previously. */ + while ((match_node = match_head)) { + match_head = match_node->next; + match_node_free(match_node); + } + + pkg_infodb_foreach(pkg, &pkg->available, pkg_infodb_update_file); + + while ((match_node = match_head)) { + strcpy(cidirrest, match_node->filetype); + + if (!rename(cidir, match_node->filename)) { + debug(dbg_scripts, "process_archive info installed %s as %s", + cidir, match_node->filename); + } else if (errno == ENOENT) { + /* Right, no new version. */ + if (unlink(match_node->filename)) + ohshite(_("unable to remove obsolete info file '%.250s'"), + match_node->filename); + debug(dbg_scripts, "process_archive info unlinked %s", + match_node->filename); + } else { + ohshite(_("unable to install (supposed) new info file '%.250s'"), cidir); + } + match_head = match_node->next; + match_node_free(match_node); + } + + /* The control directory itself. */ + cidirrest[0] = '\0'; + dsd = opendir(cidir); + if (!dsd) + ohshite(_("unable to open temp control directory")); + push_cleanup(cu_closedir, ~0, 1, (void *)dsd); + while ((de = readdir(dsd))) { + const char *newinfofilename; + + if (strchr(de->d_name, '.')) { + debug(dbg_scripts, "process_archive tmp.ci script/file '%s' contains dot", + de->d_name); + continue; + } + if (strlen(de->d_name) > MAXCONTROLFILENAME) + ohshit(_("package contains overly-long control info file name (starting '%.50s')"), + de->d_name); + + strcpy(cidirrest, de->d_name); + + /* First we check it's not a directory. */ + if (rmdir(cidir) == 0) + ohshit(_("package control info contained directory '%.250s'"), cidir); + else if (errno != ENOTDIR) + ohshite(_("package control info rmdir of '%.250s' didn't say not a dir"), + de->d_name); + + /* Ignore the control file. */ + if (strcmp(de->d_name, CONTROLFILE) == 0) { + debug(dbg_scripts, "process_archive tmp.ci script/file '%s' is control", + cidir); + continue; + } + if (strcmp(de->d_name, LISTFILE) == 0) { + warning(_("package %s contained list as info file"), + pkgbin_name(pkg, &pkg->available, pnaw_nonambig)); + continue; + } + + /* Right, install it */ + newinfofilename = pkg_infodb_get_file(pkg, &pkg->available, de->d_name); + if (rename(cidir, newinfofilename)) + ohshite(_("unable to install new info file '%.250s' as '%.250s'"), + cidir, newinfofilename); + + debug(dbg_scripts, + "process_archive tmp.ci script/file '%s' installed as '%s'", + cidir, newinfofilename); + } + pop_cleanup(ehflag_normaltidy); /* closedir */ + + /* If the old and new versions use a different infodb layout, get rid + * of the files using the old layout. */ + if (pkg->installed.multiarch != pkg->available.multiarch && + (pkg->installed.multiarch == PKG_MULTIARCH_SAME || + pkg->available.multiarch == PKG_MULTIARCH_SAME)) { + debug(dbg_scripts, + "process_archive remove old info files after db layout switch"); + pkg_infodb_foreach(pkg, &pkg->installed, pkg_infodb_remove_file); + } + + dir_sync_path(pkg_infodb_get_dir()); +} + +static void +pkg_remove_old_files(struct pkginfo *pkg, + struct fsys_namenode_queue *newfiles_queue, + struct fsys_namenode_queue *newconffiles) +{ + struct fsys_hash_rev_iter rev_iter; + struct fsys_namenode *namenode; + struct stat stab, oldfs; + + fsys_hash_rev_iter_init(&rev_iter, pkg->files); + + while ((namenode = fsys_hash_rev_iter_next(&rev_iter))) { + struct fsys_namenode *usenode; + + if ((namenode->flags & FNNF_NEW_CONFF) || + (namenode->flags & FNNF_NEW_INARCHIVE)) + continue; + + usenode = namenodetouse(namenode, pkg, &pkg->installed); + + varbuf_rollback(&fnamevb, &fname_state); + varbuf_add_str(&fnamevb, usenode->name); + varbuf_end_str(&fnamevb); + + if (!stat(namenode->name, &stab) && S_ISDIR(stab.st_mode)) { + debug(dbg_eachfiledetail, "process_archive: %s is a directory", + namenode->name); + if (dir_is_used_by_others(namenode, pkg)) + continue; + } + + if (lstat(fnamevb.buf, &oldfs)) { + if (!(errno == ENOENT || errno == ELOOP || errno == ENOTDIR)) + warning(_("could not stat old file '%.250s' so not deleting it: %s"), + fnamevb.buf, strerror(errno)); + continue; + } + if (S_ISDIR(oldfs.st_mode)) { + trig_path_activate(usenode, pkg); + + /* Do not try to remove the root directory. */ + if (strcmp(usenode->name, "/.") == 0) + continue; + + if (rmdir(fnamevb.buf)) { + warning(_("unable to delete old directory '%.250s': %s"), + namenode->name, strerror(errno)); + } else if ((namenode->flags & FNNF_OLD_CONFF)) { + warning(_("old conffile '%.250s' was an empty directory " + "(and has now been deleted)"), namenode->name); + } + } else { + struct fsys_namenode_list *sameas = NULL; + struct fsys_namenode_list *cfile; + static struct file_ondisk_id empty_ondisk_id; + struct varbuf cfilename = VARBUF_INIT; + + /* + * Ok, it's an old file, but is it really not in the new package? + * It might be known by a different name because of symlinks. + * + * We need to check to make sure, so we stat the file, then compare + * it to the new list. If we find a dev/inode match, we assume they + * are the same file, and leave it alone. NOTE: we don't check in + * other packages for sanity reasons (we don't want to stat _all_ + * the files on the system). + * + * We run down the list of _new_ files in this package. This keeps + * the process a little leaner. We are only worried about new ones + * since ones that stayed the same don't really apply here. + */ + + /* If we can't stat the old or new file, or it's a directory, + * we leave it up to the normal code. */ + debug(dbg_eachfile, "process_archive: checking %s for same files on " + "upgrade/downgrade", fnamevb.buf); + + for (cfile = newfiles_queue->head; cfile; cfile = cfile->next) { + /* If the file has been filtered then treat it as if it didn't exist + * on the file system. */ + if (cfile->namenode->flags & FNNF_FILTERED) + continue; + + if (cfile->namenode->file_ondisk_id == NULL) { + struct stat tmp_stat; + + varbuf_reset(&cfilename); + varbuf_add_str(&cfilename, instdir); + varbuf_add_str(&cfilename, cfile->namenode->name); + varbuf_end_str(&cfilename); + + if (lstat(cfilename.buf, &tmp_stat) == 0) { + struct file_ondisk_id *file_ondisk_id; + + file_ondisk_id = nfmalloc(sizeof(*file_ondisk_id)); + file_ondisk_id->id_dev = tmp_stat.st_dev; + file_ondisk_id->id_ino = tmp_stat.st_ino; + cfile->namenode->file_ondisk_id = file_ondisk_id; + } else { + if (!(errno == ENOENT || errno == ELOOP || errno == ENOTDIR)) + ohshite(_("unable to stat other new file '%.250s'"), + cfile->namenode->name); + cfile->namenode->file_ondisk_id = &empty_ondisk_id; + continue; + } + } + + if (cfile->namenode->file_ondisk_id == &empty_ondisk_id) + continue; + + if (oldfs.st_dev == cfile->namenode->file_ondisk_id->id_dev && + oldfs.st_ino == cfile->namenode->file_ondisk_id->id_ino) { + if (sameas) + warning(_("old file '%.250s' is the same as several new files! " + "(both '%.250s' and '%.250s')"), fnamevb.buf, + sameas->namenode->name, cfile->namenode->name); + sameas = cfile; + debug(dbg_eachfile, "process_archive: not removing %s, " + "since it matches %s", fnamevb.buf, cfile->namenode->name); + } + } + + varbuf_destroy(&cfilename); + + if ((namenode->flags & FNNF_OLD_CONFF)) { + if (sameas) { + if (sameas->namenode->flags & FNNF_NEW_CONFF) { + if (strcmp(sameas->namenode->oldhash, NEWCONFFILEFLAG) == 0) { + sameas->namenode->oldhash = namenode->oldhash; + debug(dbg_eachfile, "process_archive: old conff %s " + "is same as new conff %s, copying hash", + namenode->name, sameas->namenode->name); + } else { + debug(dbg_eachfile, "process_archive: old conff %s " + "is same as new conff %s but latter already has hash", + namenode->name, sameas->namenode->name); + } + } + } else { + debug(dbg_eachfile, "process_archive: old conff %s " + "is disappearing", namenode->name); + namenode->flags |= FNNF_OBS_CONFF; + tar_fsys_namenode_queue_push(newconffiles, namenode); + tar_fsys_namenode_queue_push(newfiles_queue, namenode); + } + continue; + } + + if (sameas) + continue; + + trig_path_activate(usenode, pkg); + + if (secure_unlink_statted(fnamevb.buf, &oldfs)) { + warning(_("unable to securely remove old file '%.250s': %s"), + namenode->name, strerror(errno)); + } + } /* !S_ISDIR */ + } +} + +static void +pkg_update_fields(struct pkginfo *pkg, struct fsys_namenode_queue *newconffiles) +{ + struct dependency *newdeplist, **newdeplistlastp; + struct dependency *newdep, *dep; + struct deppossi **newpossilastp, *possi, *newpossi; + struct conffile **iconffileslastp, *newiconff; + struct fsys_namenode_list *cfile; + + /* The dependencies are the most difficult. We have to build + * a whole new forward dependency tree. At least the reverse + * links (linking our deppossi's into the reverse chains) + * can be done by copy_dependency_links. */ + newdeplist = NULL; + newdeplistlastp = &newdeplist; + for (dep = pkg->available.depends; dep; dep = dep->next) { + newdep = nfmalloc(sizeof(*newdep)); + newdep->up = pkg; + newdep->next = NULL; + newdep->list = NULL; + newpossilastp = &newdep->list; + + for (possi = dep->list; possi; possi = possi->next) { + newpossi = nfmalloc(sizeof(*newpossi)); + newpossi->up = newdep; + newpossi->ed = possi->ed; + newpossi->next = NULL; + newpossi->rev_next = newpossi->rev_prev = NULL; + newpossi->arch_is_implicit = possi->arch_is_implicit; + newpossi->arch = possi->arch; + newpossi->verrel = possi->verrel; + if (possi->verrel != DPKG_RELATION_NONE) + newpossi->version = possi->version; + else + dpkg_version_blank(&newpossi->version); + newpossi->cyclebreak = false; + *newpossilastp = newpossi; + newpossilastp = &newpossi->next; + } + newdep->type = dep->type; + *newdeplistlastp = newdep; + newdeplistlastp = &newdep->next; + } + + /* Right, now we've replicated the forward tree, we + * get copy_dependency_links to remove all the old dependency + * structures from the reverse links and add the new dependency + * structures in instead. It also copies the new dependency + * structure pointer for this package into the right field. */ + copy_dependency_links(pkg, &pkg->installed.depends, newdeplist, 0); + + /* We copy the text fields. */ + pkg->installed.essential = pkg->available.essential; + pkg->installed.multiarch = pkg->available.multiarch; + pkg->installed.description = pkg->available.description; + pkg->installed.maintainer = pkg->available.maintainer; + pkg->installed.source = pkg->available.source; + pkg->installed.arch = pkg->available.arch; + pkg->installed.pkgname_archqual = pkg->available.pkgname_archqual; + pkg->installed.installedsize = pkg->available.installedsize; + pkg->installed.version = pkg->available.version; + pkg->installed.origin = pkg->available.origin; + pkg->installed.bugs = pkg->available.bugs; + + /* We have to generate our own conffiles structure. */ + pkg->installed.conffiles = NULL; + iconffileslastp = &pkg->installed.conffiles; + for (cfile = newconffiles->head; cfile; cfile = cfile->next) { + newiconff = nfmalloc(sizeof(*newiconff)); + newiconff->next = NULL; + newiconff->name = nfstrsave(cfile->namenode->name); + newiconff->hash = nfstrsave(cfile->namenode->oldhash); + newiconff->obsolete = !!(cfile->namenode->flags & FNNF_OBS_CONFF); + *iconffileslastp = newiconff; + iconffileslastp = &newiconff->next; + } + + /* We can just copy the arbitrary fields list, because it is + * never even rearranged. Phew! */ + pkg->installed.arbs = pkg->available.arbs; +} + +static void +pkg_disappear(struct pkginfo *pkg, struct pkginfo *infavour) +{ + printf(_("(Noting disappearance of %s, which has been completely replaced.)\n"), + pkg_name(pkg, pnaw_nonambig)); + log_action("disappear", pkg, &pkg->installed); + debug(dbg_general, "pkg_disappear disappearing %s", + pkg_name(pkg, pnaw_always)); + + trig_activate_packageprocessing(pkg); + maintscript_installed(pkg, POSTRMFILE, + "post-removal script (for disappearance)", + "disappear", + pkgbin_name(infavour, &infavour->available, + pnaw_nonambig), + versiondescribe(&infavour->available.version, + vdew_nonambig), + NULL); + + /* OK, now we delete all the stuff in the ‘info’ directory ... */ + debug(dbg_general, "pkg_disappear cleaning info directory"); + pkg_infodb_foreach(pkg, &pkg->installed, pkg_infodb_remove_file); + dir_sync_path(pkg_infodb_get_dir()); + + pkg_set_status(pkg, PKG_STAT_NOTINSTALLED); + pkg_set_want(pkg, PKG_WANT_UNKNOWN); + pkg_reset_eflags(pkg); + + dpkg_version_blank(&pkg->configversion); + pkgbin_blank(&pkg->installed); + + pkg->files_list_valid = false; + + modstatdb_note(pkg); +} + +static void +pkg_disappear_others(struct pkginfo *pkg) +{ + struct pkg_hash_iter *iter; + struct pkginfo *otherpkg; + struct fsys_namenode_list *cfile; + struct deppossi *pdep; + struct dependency *providecheck; + struct varbuf depprobwhy = VARBUF_INIT; + + iter = pkg_hash_iter_new(); + while ((otherpkg = pkg_hash_iter_next_pkg(iter)) != NULL) { + ensure_package_clientdata(otherpkg); + + if (otherpkg == pkg || + otherpkg->status == PKG_STAT_NOTINSTALLED || + otherpkg->status == PKG_STAT_CONFIGFILES || + otherpkg->clientdata->istobe == PKG_ISTOBE_REMOVE || + !otherpkg->files) + continue; + + /* Do not try to disappear other packages from the same set + * if they are Multi-Arch: same */ + if (pkg->installed.multiarch == PKG_MULTIARCH_SAME && + otherpkg->installed.multiarch == PKG_MULTIARCH_SAME && + otherpkg->set == pkg->set) + continue; + + debug(dbg_veryverbose, "process_archive checking disappearance %s", + pkg_name(otherpkg, pnaw_always)); + + if (otherpkg->clientdata->istobe != PKG_ISTOBE_NORMAL && + otherpkg->clientdata->istobe != PKG_ISTOBE_DECONFIGURE) + internerr("disappearing package %s is not to be normal or deconfigure, " + "is to be %d", + pkg_name(otherpkg, pnaw_always), otherpkg->clientdata->istobe); + + for (cfile = otherpkg->files; + cfile && strcmp(cfile->namenode->name, "/.") == 0; + cfile = cfile->next); + if (!cfile) { + debug(dbg_stupidlyverbose, "process_archive no non-root, no disappear"); + continue; + } + for (cfile = otherpkg->files; + cfile && !filesavespackage(cfile, otherpkg, pkg); + cfile = cfile->next); + if (cfile) + continue; + + /* So dependency things will give right answers ... */ + otherpkg->clientdata->istobe = PKG_ISTOBE_REMOVE; + debug(dbg_veryverbose, "process_archive disappear checking dependencies"); + for (pdep = otherpkg->set->depended.installed; + pdep; + pdep = pdep->rev_next) { + if (pdep->up->type != dep_depends && + pdep->up->type != dep_predepends && + pdep->up->type != dep_recommends) + continue; + + if (depisok(pdep->up, &depprobwhy, NULL, NULL, false)) + continue; + + varbuf_end_str(&depprobwhy); + debug(dbg_veryverbose,"process_archive cannot disappear: %s", + depprobwhy.buf); + break; + } + if (!pdep) { + /* If we haven't found a reason not to yet, let's look some more. */ + for (providecheck = otherpkg->installed.depends; + providecheck; + providecheck = providecheck->next) { + if (providecheck->type != dep_provides) + continue; + + for (pdep = providecheck->list->ed->depended.installed; + pdep; + pdep = pdep->rev_next) { + if (pdep->up->type != dep_depends && + pdep->up->type != dep_predepends && + pdep->up->type != dep_recommends) + continue; + + if (depisok(pdep->up, &depprobwhy, NULL, NULL, false)) + continue; + + varbuf_end_str(&depprobwhy); + debug(dbg_veryverbose, + "process_archive cannot disappear (provides %s): %s", + providecheck->list->ed->name, depprobwhy.buf); + goto break_from_both_loops_at_once; + } + } + break_from_both_loops_at_once:; + } + otherpkg->clientdata->istobe = PKG_ISTOBE_NORMAL; + if (pdep) + continue; + + /* No, we're disappearing it. This is the wrong time to go and + * run maintainer scripts and things, as we can't back out. But + * what can we do ? It has to be run this late. */ + pkg_disappear(otherpkg, pkg); + } /* while (otherpkg= ... */ + pkg_hash_iter_free(iter); +} + +/** + * Check if all instances of a pkgset are getting in sync. + * + * If that's the case, the extraction is going to ensure consistency + * of shared files. + */ +static bool +pkgset_getting_in_sync(struct pkginfo *pkg) +{ + struct pkginfo *otherpkg; + + for (otherpkg = &pkg->set->pkg; otherpkg; otherpkg = otherpkg->arch_next) { + if (otherpkg == pkg) + continue; + if (otherpkg->status <= PKG_STAT_CONFIGFILES) + continue; + if (dpkg_version_compare(&pkg->available.version, + &otherpkg->installed.version)) { + return false; + } + } + + return true; +} + +static void +pkg_remove_files_from_others(struct pkginfo *pkg, struct fsys_namenode_list *newfileslist) +{ + struct fsys_namenode_list *cfile; + struct pkginfo *otherpkg; + + for (cfile = newfileslist; cfile; cfile = cfile->next) { + struct fsys_node_pkgs_iter *iter; + struct pkgset *divpkgset; + + if (!(cfile->namenode->flags & FNNF_ELIDE_OTHER_LISTS)) + continue; + + if (cfile->namenode->divert && cfile->namenode->divert->useinstead) { + divpkgset = cfile->namenode->divert->pkgset; + if (divpkgset == pkg->set) { + debug(dbg_eachfile, + "process_archive not overwriting any '%s' (overriding, '%s')", + cfile->namenode->name, cfile->namenode->divert->useinstead->name); + continue; + } else { + debug(dbg_eachfile, + "process_archive looking for overwriting '%s' (overridden by %s)", + cfile->namenode->name, divpkgset ? divpkgset->name : "<local>"); + } + } else { + divpkgset = NULL; + debug(dbg_eachfile, "process_archive looking for overwriting '%s'", + cfile->namenode->name); + } + + iter = fsys_node_pkgs_iter_new(cfile->namenode); + while ((otherpkg = fsys_node_pkgs_iter_next(iter))) { + debug(dbg_eachfiledetail, "process_archive ... found in %s", + pkg_name(otherpkg, pnaw_always)); + + /* A pkgset can share files between instances, so there's no point + * in rewriting the file that's already in place. */ + if (otherpkg->set == pkg->set) + continue; + + if (otherpkg->set == divpkgset) { + debug(dbg_eachfiledetail, "process_archive ... diverted, skipping"); + continue; + } + + if (cfile->namenode->flags & FNNF_NEW_CONFF) + conffile_mark_obsolete(otherpkg, cfile->namenode); + + /* If !files_list_valid then it's one of the disappeared packages above + * or we have already updated the files list file, and we don't bother + * with it here, clearly. */ + if (!otherpkg->files_list_valid) + continue; + + /* Found one. We delete the list entry for this file, + * (and any others in the same package) and then mark the package + * as requiring a reread. */ + write_filelist_except(otherpkg, &otherpkg->installed, + otherpkg->files, FNNF_ELIDE_OTHER_LISTS); + debug(dbg_veryverbose, "process_archive overwrote from %s", + pkg_name(otherpkg, pnaw_always)); + } + fsys_node_pkgs_iter_free(iter); + } +} + +static void +pkg_remove_backup_files(struct pkginfo *pkg, struct fsys_namenode_list *newfileslist) +{ + struct fsys_namenode_list *cfile; + + for (cfile = newfileslist; cfile; cfile = cfile->next) { + struct fsys_namenode *usenode; + + if (cfile->namenode->flags & FNNF_NEW_CONFF) + continue; + + usenode = namenodetouse(cfile->namenode, pkg, &pkg->installed); + + /* Do not try to remove backups for the root directory. */ + if (strcmp(usenode->name, "/.") == 0) + continue; + + varbuf_rollback(&fnametmpvb, &fname_state); + varbuf_add_str(&fnametmpvb, usenode->name); + varbuf_add_str(&fnametmpvb, DPKGTEMPEXT); + varbuf_end_str(&fnametmpvb); + path_remove_tree(fnametmpvb.buf); + } +} + +void process_archive(const char *filename) { + static const struct tar_operations tf = { + .read = tarfileread, + .extract_file = tarobject, + .link = tarobject, + .symlink = tarobject, + .mkdir = tarobject, + .mknod = tarobject, + }; + + /* These need to be static so that we can pass their addresses to + * push_cleanup as arguments to the cu_xxx routines; if an error occurs + * we unwind the stack before processing the cleanup list, and these + * variables had better still exist ... */ + static int p1[2]; + static enum pkgstatus oldversionstatus; + static struct tarcontext tc; + + struct tar_archive tar; + struct dpkg_error err; + enum parsedbflags parsedb_flags; + int rc; + pid_t pid; + struct pkginfo *pkg, *otherpkg; + struct pkg_list *conflictor_iter; + char *cidir = NULL; + char *cidirrest; + char *psize; + const char *pfilename; + struct fsys_namenode_queue newconffiles, newfiles_queue; + struct stat stab; + + cleanup_pkg_failed= cleanup_conflictor_failed= 0; + + pfilename = summarize_filename(filename); + + if (stat(filename, &stab)) + ohshite(_("cannot access archive '%s'"), filename); + + /* We can't ‘tentatively-reassemble’ packages. */ + if (!f_noact) { + if (!deb_reassemble(&filename, &pfilename)) + return; + } + + /* Verify the package. */ + if (!f_nodebsig) + deb_verify(filename); + + /* Get the control information directory. */ + cidir = get_control_dir(cidir); + cidirrest = cidir + strlen(cidir); + push_cleanup(cu_cidir, ~0, 2, (void *)cidir, (void *)cidirrest); + + pid = subproc_fork(); + if (pid == 0) { + cidirrest[-1] = '\0'; + execlp(BACKEND, BACKEND, "--control", filename, cidir, NULL); + ohshite(_("unable to execute %s (%s)"), + _("package control information extraction"), BACKEND); + } + subproc_reap(pid, BACKEND " --control", 0); + + /* We want to guarantee the extracted files are on the disk, so that the + * subsequent renames to the info database do not end up with old or zero + * length files in case of a system crash. As neither dpkg-deb nor tar do + * explicit fsync()s, we have to do them here. + * XXX: This could be avoided by switching to an internal tar extractor. */ + dir_sync_contents(cidir); + + strcpy(cidirrest,CONTROLFILE); + + if (cipaction->arg_int == act_avail) + parsedb_flags = pdb_parse_available; + else + parsedb_flags = pdb_parse_binary; + parsedb_flags |= pdb_ignore_archives; + if (in_force(FORCE_BAD_VERSION)) + parsedb_flags |= pdb_lax_version_parser; + + parsedb(cidir, parsedb_flags, &pkg); + + if (!pkg->archives) { + pkg->archives = nfmalloc(sizeof(*pkg->archives)); + pkg->archives->next = NULL; + pkg->archives->name = NULL; + pkg->archives->msdosname = NULL; + pkg->archives->md5sum = NULL; + } + /* Always nfmalloc. Otherwise, we may overwrite some other field (like + * md5sum). */ + psize = nfmalloc(30); + sprintf(psize, "%jd", (intmax_t)stab.st_size); + pkg->archives->size = psize; + + if (cipaction->arg_int == act_avail) { + printf(_("Recorded info about %s from %s.\n"), + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), pfilename); + pop_cleanup(ehflag_normaltidy); + return; + } + + if (pkg->available.arch->type != DPKG_ARCH_ALL && + pkg->available.arch->type != DPKG_ARCH_NATIVE && + pkg->available.arch->type != DPKG_ARCH_FOREIGN) + forcibleerr(FORCE_ARCHITECTURE, + _("package architecture (%s) does not match system (%s)"), + pkg->available.arch->name, + dpkg_arch_get(DPKG_ARCH_NATIVE)->name); + + clear_deconfigure_queue(); + clear_istobes(); + + if (wanttoinstall(pkg)) { + pkg_set_want(pkg, PKG_WANT_INSTALL); + } else { + pop_cleanup(ehflag_normaltidy); + return; + } + + /* Deconfigure other instances from a pkgset if they are not in sync. */ + for (otherpkg = &pkg->set->pkg; otherpkg; otherpkg = otherpkg->arch_next) { + if (otherpkg == pkg) + continue; + if (otherpkg->status <= PKG_STAT_HALFCONFIGURED) + continue; + + if (dpkg_version_compare(&pkg->available.version, + &otherpkg->installed.version)) + enqueue_deconfigure(otherpkg, NULL); + } + + pkg_check_depcon(pkg, pfilename); + + ensure_allinstfiles_available(); + fsys_hash_init(); + trig_file_interests_ensure(); + + printf(_("Preparing to unpack %s ...\n"), pfilename); + + if (pkg->status != PKG_STAT_NOTINSTALLED && + pkg->status != PKG_STAT_CONFIGFILES) { + log_action("upgrade", pkg, &pkg->installed); + } else { + log_action("install", pkg, &pkg->available); + } + + if (f_noact) { + pop_cleanup(ehflag_normaltidy); + return; + } + + /* + * OK, we're going ahead. + */ + + trig_activate_packageprocessing(pkg); + strcpy(cidirrest, TRIGGERSCIFILE); + trig_parse_ci(cidir, NULL, trig_cicb_statuschange_activate, pkg, &pkg->available); + + /* Read the conffiles, and copy the hashes across. */ + newconffiles.head = NULL; + newconffiles.tail = &newconffiles.head; + push_cleanup(cu_fileslist, ~0, 0); + strcpy(cidirrest,CONFFILESFILE); + deb_parse_conffiles(pkg, cidir, &newconffiles); + + /* All the old conffiles are marked with a flag, so that we don't delete + * them if they seem to disappear completely. */ + pkg_conffiles_mark_old(pkg); + for (conflictor_iter = conflictors.head; + conflictor_iter; + conflictor_iter = conflictor_iter->next) + pkg_conffiles_mark_old(conflictor_iter->pkg); + + oldversionstatus= pkg->status; + + if (oldversionstatus > PKG_STAT_INSTALLED) + internerr("package %s state %d is out-of-bounds", + pkg_name(pkg, pnaw_always), oldversionstatus); + + debug(dbg_general,"process_archive oldversionstatus=%s", + statusstrings[oldversionstatus]); + + if (oldversionstatus == PKG_STAT_HALFCONFIGURED || + oldversionstatus == PKG_STAT_TRIGGERSAWAITED || + oldversionstatus == PKG_STAT_TRIGGERSPENDING || + oldversionstatus == PKG_STAT_INSTALLED) { + pkg_set_eflags(pkg, PKG_EFLAG_REINSTREQ); + pkg_set_status(pkg, PKG_STAT_HALFCONFIGURED); + modstatdb_note(pkg); + push_cleanup(cu_prermupgrade, ~ehflag_normaltidy, 1, (void *)pkg); + if (dpkg_version_compare(&pkg->available.version, + &pkg->installed.version) >= 0) + /* Upgrade or reinstall. */ + maintscript_fallback(pkg, PRERMFILE, "pre-removal", cidir, cidirrest, + "upgrade", "failed-upgrade"); + else /* Downgrade => no fallback */ + maintscript_installed(pkg, PRERMFILE, "pre-removal", + "upgrade", + versiondescribe(&pkg->available.version, + vdew_nonambig), + NULL); + pkg_set_status(pkg, PKG_STAT_UNPACKED); + oldversionstatus = PKG_STAT_UNPACKED; + modstatdb_note(pkg); + } + + pkg_deconfigure_others(pkg); + + for (conflictor_iter = conflictors.head; + conflictor_iter; + conflictor_iter = conflictor_iter->next) { + struct pkginfo *conflictor = conflictor_iter->pkg; + + if (!(conflictor->status == PKG_STAT_HALFCONFIGURED || + conflictor->status == PKG_STAT_TRIGGERSAWAITED || + conflictor->status == PKG_STAT_TRIGGERSPENDING || + conflictor->status == PKG_STAT_INSTALLED)) + continue; + + trig_activate_packageprocessing(conflictor); + pkg_set_status(conflictor, PKG_STAT_HALFCONFIGURED); + modstatdb_note(conflictor); + push_cleanup(cu_prerminfavour, ~ehflag_normaltidy, + 2, conflictor, pkg); + maintscript_installed(conflictor, PRERMFILE, "pre-removal", + "remove", "in-favour", + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + versiondescribe(&pkg->available.version, + vdew_nonambig), + NULL); + pkg_set_status(conflictor, PKG_STAT_HALFINSTALLED); + modstatdb_note(conflictor); + } + + pkg_set_eflags(pkg, PKG_EFLAG_REINSTREQ); + if (pkg->status == PKG_STAT_NOTINSTALLED) { + pkg->installed.version= pkg->available.version; + pkg->installed.multiarch = pkg->available.multiarch; + } + pkg_set_status(pkg, PKG_STAT_HALFINSTALLED); + modstatdb_note(pkg); + if (oldversionstatus == PKG_STAT_NOTINSTALLED) { + push_cleanup(cu_preinstverynew, ~ehflag_normaltidy, + 3,(void*)pkg,(void*)cidir,(void*)cidirrest); + maintscript_new(pkg, PREINSTFILE, "pre-installation", cidir, cidirrest, + "install", NULL); + } else if (oldversionstatus == PKG_STAT_CONFIGFILES) { + push_cleanup(cu_preinstnew, ~ehflag_normaltidy, + 3,(void*)pkg,(void*)cidir,(void*)cidirrest); + maintscript_new(pkg, PREINSTFILE, "pre-installation", cidir, cidirrest, + "install", + versiondescribe(&pkg->installed.version, vdew_nonambig), + versiondescribe(&pkg->available.version, vdew_nonambig), + NULL); + } else { + push_cleanup(cu_preinstupgrade, ~ehflag_normaltidy, + 4,(void*)pkg,(void*)cidir,(void*)cidirrest,(void*)&oldversionstatus); + maintscript_new(pkg, PREINSTFILE, "pre-installation", cidir, cidirrest, + "upgrade", + versiondescribe(&pkg->installed.version, vdew_nonambig), + versiondescribe(&pkg->available.version, vdew_nonambig), + NULL); + } + + if (oldversionstatus == PKG_STAT_NOTINSTALLED || + oldversionstatus == PKG_STAT_CONFIGFILES) { + printf(_("Unpacking %s (%s) ...\n"), + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + versiondescribe(&pkg->available.version, vdew_nonambig)); + } else { + printf(_("Unpacking %s (%s) over (%s) ...\n"), + pkgbin_name(pkg, &pkg->available, pnaw_nonambig), + versiondescribe(&pkg->available.version, vdew_nonambig), + versiondescribe(&pkg->installed.version, vdew_nonambig)); + } + + /* + * Now we unpack the archive, backing things up as we go. + * For each file, we check to see if it already exists. + * There are several possibilities: + * + * + We are trying to install a non-directory ... + * - It doesn't exist. In this case we simply extract it. + * - It is a plain file, device, symlink, &c. We do an ‘atomic + * overwrite’ using link() and rename(), but leave a backup copy. + * Later, when we delete the backup, we remove it from any other + * packages' lists. + * - It is a directory. In this case it depends on whether we're + * trying to install a symlink or something else. + * = If we're not trying to install a symlink we move the directory + * aside and extract the node. Later, when we recursively remove + * the backed-up directory, we remove it from any other packages' + * lists. + * = If we are trying to install a symlink we do nothing - ie, + * dpkg will never replace a directory tree with a symlink. This + * is to avoid embarrassing effects such as replacing a directory + * tree with a link to a link to the original directory tree. + * + We are trying to install a directory ... + * - It doesn't exist. We create it with the appropriate modes. + * - It exists as a directory or a symlink to one. We do nothing. + * - It is a plain file or a symlink (other than to a directory). + * We move it aside and create the directory. Later, when we + * delete the backup, we remove it from any other packages' lists. + * + * Install non-dir Install symlink Install dir + * Exists not X X X + * File/node/symlink LXR LXR BXR + * Directory BXR - - + * + * X: extract file/node/link/directory + * LX: atomic overwrite leaving backup + * B: ordinary backup + * R: later remove from other packages' lists + * -: do nothing + * + * After we've done this we go through the remaining things in the + * lists of packages we're trying to remove (including the old + * version of the current package). This happens in reverse order, + * so that we process files before the directories (or symlinks-to- + * directories) containing them. + * + * + If the thing is a conffile then we leave it alone for the purge + * operation. + * + Otherwise, there are several possibilities too: + * - The listed thing does not exist. We ignore it. + * - The listed thing is a directory or a symlink to a directory. + * We delete it only if it isn't listed in any other package. + * - The listed thing is not a directory, but was part of the package + * that was upgraded, we check to make sure the files aren't the + * same ones from the old package by checking dev/inode + * - The listed thing is not a directory or a symlink to one (ie, + * it's a plain file, device, pipe, &c, or a symlink to one, or a + * dangling symlink). We delete it. + * + * The removed packages' list becomes empty (of course, the new + * version of the package we're installing will have a new list, + * which replaces the old version's list). + * + * If at any stage we remove a file from a package's list, and the + * package isn't one we're already processing, and the package's + * list becomes empty as a result, we ‘vanish’ the package. This + * means that we run its postrm with the ‘disappear’ argument, and + * put the package in the ‘not-installed’ state. If it had any + * conffiles, their hashes and ownership will have been transferred + * already, so we just ignore those and forget about them from the + * point of view of the disappearing package. + * + * NOTE THAT THE OLD POSTRM IS RUN AFTER THE NEW PREINST, since the + * files get replaced ‘as we go’. + */ + + m_pipe(p1); + push_cleanup(cu_closepipe, ehflag_bombout, 1, (void *)&p1[0]); + pid = subproc_fork(); + if (pid == 0) { + m_dup2(p1[1],1); close(p1[0]); close(p1[1]); + execlp(BACKEND, BACKEND, "--fsys-tarfile", filename, NULL); + ohshite(_("unable to execute %s (%s)"), + _("package filesystem archive extraction"), BACKEND); + } + close(p1[1]); + p1[1] = -1; + + newfiles_queue.head = NULL; + newfiles_queue.tail = &newfiles_queue.head; + tc.newfiles_queue = &newfiles_queue; + push_cleanup(cu_fileslist, ~0, 0); + tc.pkg= pkg; + tc.backendpipe= p1[0]; + tc.pkgset_getting_in_sync = pkgset_getting_in_sync(pkg); + + /* Setup the tar archive. */ + tar.err = DPKG_ERROR_OBJECT; + tar.ctx = &tc; + tar.ops = &tf; + + rc = tar_extractor(&tar); + if (rc) + dpkg_error_print(&tar.err, + _("corrupted filesystem tarfile in package archive")); + if (fd_skip(p1[0], -1, &err) < 0) + ohshit(_("cannot zap possible trailing zeros from dpkg-deb: %s"), err.str); + close(p1[0]); + p1[0] = -1; + subproc_reap(pid, BACKEND " --fsys-tarfile", SUBPROC_NOPIPE); + + tar_deferred_extract(newfiles_queue.head, pkg); + + if (oldversionstatus == PKG_STAT_HALFINSTALLED || + oldversionstatus == PKG_STAT_UNPACKED) { + /* Packages that were in ‘installed’ and ‘postinstfailed’ have been + * reduced to ‘unpacked’ by now, by the running of the prerm script. */ + pkg_set_status(pkg, PKG_STAT_HALFINSTALLED); + modstatdb_note(pkg); + push_cleanup(cu_postrmupgrade, ~ehflag_normaltidy, 1, (void *)pkg); + maintscript_fallback(pkg, POSTRMFILE, "post-removal", cidir, cidirrest, + "upgrade", "failed-upgrade"); + } + + /* If anything goes wrong while tidying up it's a bit late to do + * anything about it. However, we don't install the new status + * info yet, so that a future dpkg installation will put everything + * right (we hope). + * + * If something does go wrong later the ‘conflictor’ package will be + * left in the ‘removal_failed’ state. Removing or installing it + * will be impossible if it was required because of the conflict with + * the package we're installing now and (presumably) the dependency + * by other packages. This means that the files it contains in + * common with this package will hang around until we successfully + * get this package installed, after which point we can trust the + * conflicting package's file list, which will have been updated to + * remove any files in this package. */ + push_checkpoint(~ehflag_bombout, ehflag_normaltidy); + + /* Now we delete all the files that were in the old version of + * the package only, except (old or new) conffiles, which we leave + * alone. */ + pkg_remove_old_files(pkg, &newfiles_queue, &newconffiles); + + /* OK, now we can write the updated files-in-this package list, + * since we've done away (hopefully) with all the old junk. */ + write_filelist_except(pkg, &pkg->available, newfiles_queue.head, 0); + + /* Trigger interests may have changed. + * Firstly we go through the old list of interests deleting them. + * Then we go through the new list adding them. */ + strcpy(cidirrest, TRIGGERSCIFILE); + trig_parse_ci(pkg_infodb_get_file(pkg, &pkg->installed, TRIGGERSCIFILE), + trig_cicb_interest_delete, NULL, pkg, &pkg->installed); + trig_parse_ci(cidir, trig_cicb_interest_add, NULL, pkg, &pkg->available); + trig_file_interests_save(); + + /* We also install the new maintainer scripts, and any other + * cruft that may have come along with the package. First + * we go through the existing scripts replacing or removing + * them as appropriate; then we go through the new scripts + * (any that are left) and install them. */ + debug(dbg_general, "process_archive updating info directory"); + pkg_infodb_update(pkg, cidir, cidirrest); + + /* We store now the checksums dynamically computed while unpacking. */ + write_filehash_except(pkg, &pkg->available, newfiles_queue.head, 0); + + /* + * Update the status database. + * + * This involves copying each field across from the ‘available’ + * to the ‘installed’ half of the pkg structure. + * For some of the fields we have to do a complicated construction + * operation; for others we can just copy the value. + * We tackle the fields in the order they appear, so that + * we don't miss any out :-). + * At least we don't have to copy any strings that are referred + * to, because these are never modified and never freed. + */ + pkg_update_fields(pkg, &newconffiles); + + /* In case this was an architecture cross-grade, the in-core pkgset might + * be in an inconsistent state, with two pkginfo entries having the same + * architecture, so let's fix that. Note that this does not lose data, + * as the pkg.available member parsed from the binary should replace the + * to be cleared duplicate in the other instance. */ + for (otherpkg = &pkg->set->pkg; otherpkg; otherpkg = otherpkg->arch_next) { + if (otherpkg == pkg) + continue; + if (otherpkg->installed.arch != pkg->installed.arch) + continue; + + if (otherpkg->status != PKG_STAT_NOTINSTALLED) + internerr("other package %s instance in state %s instead of not-installed", + pkg_name(otherpkg, pnaw_always), pkg_status_name(otherpkg)); + + pkg_blank(otherpkg); + } + + /* Check for disappearing packages: + * We go through all the packages on the system looking for ones + * whose files are entirely part of the one we've just unpacked + * (and which actually *have* some files!). + * + * Any that we find are removed - we run the postrm with ‘disappear’ + * as an argument, and remove their info/... files and status info. + * Conffiles are ignored (the new package had better do something + * with them!). */ + pkg_disappear_others(pkg); + + /* Delete files from any other packages' lists. + * We have to do this before we claim this package is in any + * sane kind of state, as otherwise we might delete by mistake + * a file that we overwrote, when we remove the package which + * had the version we overwrote. To prevent this we make + * sure that we don't claim this package is OK until we + * have claimed ‘ownership’ of all its files. */ + pkg_remove_files_from_others(pkg, newfiles_queue.head); + + /* Right, the package we've unpacked is now in a reasonable state. + * The only thing that we have left to do with it is remove + * backup files, and we can leave the user to fix that if and when + * it happens (we leave the reinstall required flag, of course). */ + pkg_set_status(pkg, PKG_STAT_UNPACKED); + modstatdb_note(pkg); + + /* Now we delete all the backup files that we made when + * extracting the archive - except for files listed as conffiles + * in the new package. + * This time we count it as an error if something goes wrong. + * + * Note that we don't ever delete things that were in the old + * package as a conffile and don't appear at all in the new. + * They stay recorded as obsolete conffiles and will eventually + * (if not taken over by another package) be forgotten. */ + pkg_remove_backup_files(pkg, newfiles_queue.head); + + /* OK, we're now fully done with the main package. + * This is quite a nice state, so we don't unwind past here. */ + pkg_reset_eflags(pkg); + modstatdb_note(pkg); + push_checkpoint(~ehflag_bombout, ehflag_normaltidy); + + /* Only the removal of the conflictor left to do. + * The files list for the conflictor is still a little inconsistent in-core, + * as we have not yet updated the filename->packages mappings; however, + * the package->filenames mapping is. */ + while (!pkg_queue_is_empty(&conflictors)) { + struct pkginfo *conflictor = pkg_queue_pop(&conflictors); + + /* We need to have the most up-to-date info about which files are + * what ... */ + ensure_allinstfiles_available(); + removal_bulk(conflictor); + } + + if (cipaction->arg_int == act_install) + enqueue_package_mark_seen(pkg); +} |