path: root/lib/libalpm/add.c

/*
 *  add.c
 * 
 *  Copyright (c) 2002-2007 by Judd Vinet <jvinet@zeroflux.org>
 * 
 *  This program 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 program 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, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
 *  USA.
 */

#include "config.h"

#include <stdlib.h>
#include <errno.h>
#include <time.h>
#include <string.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

/* libarchive */
#include <archive.h>
#include <archive_entry.h>

/* libalpm */
#include "add.h"
#include "alpm_list.h"
#include "trans.h"
#include "util.h"
#include "error.h"
#include "cache.h"
#include "md5.h"
#include "log.h"
#include "backup.h"
#include "package.h"
#include "db.h"
#include "provide.h"
#include "conflict.h"
#include "deps.h"
#include "remove.h"
#include "handle.h"

int _alpm_add_loadtarget(pmtrans_t *trans, pmdb_t *db, char *name)
{
	pmpkg_t *info = NULL;
	pmpkg_t *dummy;
	char pkgname[PKG_NAME_LEN], pkgver[PKG_VERSION_LEN];
	alpm_list_t *i;
	struct stat buf;

	ALPM_LOG_FUNC;

	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));
	ASSERT(name != NULL && strlen(name) != 0, RET_ERR(PM_ERR_WRONG_ARGS, -1));

	_alpm_log(PM_LOG_DEBUG, "loading target '%s'", name);

	/* TODO FS#5120 we need a better way to check if a package is a valid package,
	 * and read the metadata instead of relying on the filename for package name
	 * and version */
	if(stat(name, &buf)) {
		pm_errno = PM_ERR_NOT_A_FILE;
		goto error;
	}

	if(_alpm_pkg_splitname(name, pkgname, pkgver, 1) == -1) {
		pm_errno = PM_ERR_PKG_INVALID_NAME;
		goto error;
	}

	/* no additional hyphens in version strings */
	if(strchr(pkgver, '-') != strrchr(pkgver, '-')) {
		pm_errno = PM_ERR_PKG_INVALID_NAME;
		goto error;
	}

	if(trans->type != PM_TRANS_TYPE_UPGRADE) {
		/* only install this package if it is not already installed */
		if(_alpm_db_get_pkgfromcache(db, pkgname)) {
			pm_errno = PM_ERR_PKG_INSTALLED;
			goto error;
		}
	} else {
		if(trans->flags & PM_TRANS_FLAG_FRESHEN) {
			/* only upgrade/install this package if it is already installed and at a lesser version */
			dummy = _alpm_db_get_pkgfromcache(db, pkgname);
			if(dummy == NULL || _alpm_versioncmp(dummy->version, pkgver) >= 0) {
				pm_errno = PM_ERR_PKG_CANT_FRESH;
				goto error;
			}
		}
	}

	/* check if an older version of said package is already in transaction packages.
	 * if so, replace it in the list */
	for(i = trans->packages; i; i = i->next) {
		pmpkg_t *pkg = i->data;
		if(strcmp(pkg->name, pkgname) == 0) {
			if(_alpm_versioncmp(pkg->version, pkgver) < 0) {
				pmpkg_t *newpkg;
				_alpm_log(PM_LOG_WARNING, _("replacing older version %s-%s by %s in target list"),
				          pkg->name, pkg->version, pkgver);
				if((newpkg = _alpm_pkg_load(name)) == NULL) {
					/* pm_errno is already set by pkg_load() */
					goto error;
				}
				_alpm_pkg_free(i->data);
				i->data = newpkg;
			} else {
				_alpm_log(PM_LOG_WARNING, _("newer version %s-%s is in the target list -- skipping"),
				          pkg->name, pkg->version);
			}
			return(0);
		}
	}

	_alpm_log(PM_LOG_DEBUG, "reading '%s' metadata", pkgname);
	info = _alpm_pkg_load(name);
	if(info == NULL) {
		/* pm_errno is already set by pkg_load() */
		goto error;
	}
	/* check to verify we're not getting fooled by a corrupted package */
	if(strcmp(pkgname, info->name) != 0 || strcmp(pkgver, info->version) != 0) {
		pm_errno = PM_ERR_PKG_INVALID;
		goto error;
	}

	if(trans->flags & PM_TRANS_FLAG_ALLDEPS) {
		info->reason = PM_PKG_REASON_DEPEND;
	}

	/* add the package to the transaction */
	trans->packages = alpm_list_add(trans->packages, info);

	return(0);

error:
	_alpm_pkg_free(info);
	return(-1);
}


/* This is still messy. We have a lot of compare functions, and we should
 * try to consolidate them as much as we can (between add and sync) */
/*static int deppkg_cmp(const void *p1, const void *p2)
{
	return(strcmp(((pmdepmissing_t *)p1)->target,
				        ((pmdepmissing_t *)p2)->target));
}*/

int _alpm_add_prepare(pmtrans_t *trans, pmdb_t *db, alpm_list_t **data)
{
	alpm_list_t *lp = NULL, *i = NULL;

	ALPM_LOG_FUNC;

	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));

	/* Check dependencies
	 */
	if(!(trans->flags & PM_TRANS_FLAG_NODEPS)) {
		EVENT(trans, PM_TRANS_EVT_CHECKDEPS_START, NULL, NULL);

		/* look for unsatisfied dependencies */
		_alpm_log(PM_LOG_DEBUG, "looking for unsatisfied dependencies");
		lp = _alpm_checkdeps(db, trans->type, trans->packages);
		if(lp != NULL) {
			if(data) {
				*data = lp;
			} else {
				FREELIST(lp);
			}
			RET_ERR(PM_ERR_UNSATISFIED_DEPS, -1);
		}

		/* no unsatisfied deps, so look for conflicts */
		_alpm_log(PM_LOG_DEBUG, "looking for conflicts");
		lp = _alpm_checkconflicts(db, trans->packages);
		for(i = lp; i; i = i->next) {
			pmdepmissing_t *miss = i->data;

			_alpm_log(PM_LOG_ERROR, _("replacing packages with -A and -U is not supported yet"));
			_alpm_log(PM_LOG_ERROR, _("please remove '%s' first, using -Rd"), miss->depend.name);
			RET_ERR(PM_ERR_CONFLICTING_DEPS, -1);
			
			/* Attempt to resolve conflicts */
			/*
			int skip_this = 0;
			QUESTION(trans, PM_TRANS_CONV_CONFLICT_PKG, miss->target, miss->depend.name, NULL, &skip_this);
			if(skip_this) {
				pmdepmissing_t *pkg = NULL;
				lp = alpm_list_remove(lp, (void *)miss, deppkg_cmp, (void*)&pkg);
				*/
				/* TODO: We remove the conflict from the list but never actually remove
				 * the package. Need to do this to fix FS #3492. The sync code should
				 * provide an example of how to do this, as it handles replaces and
				 * removes. We run into problems because we do a file conflict check
				 * below and it fails there. A force flag will skip that part, but
				 * still not remove the original package designated here for removal.
				 * Better yet, dump all this shitty duplicate code and somehow combine
				 * it with the sync code. */
				/*
				FREE(pkg);
				if(lp == NULL) {
					break;
				}
			}
			*/
		}
		/* Removal code should go here, as described above. Instead of simply
		 * removing items, perhaps throw them in another list to be removed, then
		 * proceed as sync.c would? I'm not sure because I'm not familiar enough
		 * with the codebase. */
		if(lp != NULL) {
			if(data) {
				*data = lp;
			} else {
				FREELIST(lp);
			}
			RET_ERR(PM_ERR_CONFLICTING_DEPS, -1);
		}

		/* re-order w.r.t. dependencies */
		_alpm_log(PM_LOG_DEBUG, "sorting by dependencies");
		lp = _alpm_sortbydeps(trans->packages, PM_TRANS_TYPE_ADD);
		/* free the old alltargs */
		alpm_list_free(trans->packages);
		trans->packages = lp;

		EVENT(trans, PM_TRANS_EVT_CHECKDEPS_DONE, NULL, NULL);
	}

	/* Check for file conflicts */
	if(!(trans->flags & PM_TRANS_FLAG_FORCE)) {
		EVENT(trans, PM_TRANS_EVT_FILECONFLICTS_START, NULL, NULL);

		_alpm_log(PM_LOG_DEBUG, "looking for file conflicts");
		lp = _alpm_db_find_conflicts(db, trans, handle->root);
		if(lp != NULL) {
			if(data) {
				*data = lp;
			} else {
				FREELIST(lp);
			}
			RET_ERR(PM_ERR_FILE_CONFLICTS, -1);
		}

		EVENT(trans, PM_TRANS_EVT_FILECONFLICTS_DONE, NULL, NULL);
	}

	return(0);
}

static int upgrade_remove(pmpkg_t *oldpkg, pmpkg_t *newpkg, pmtrans_t *trans, pmdb_t *db) {
	/* this is kinda odd.  If the old package exists, at this point we make a
	 * NEW transaction, unrelated to handle->trans, and instantiate a "remove"
	 * with the type PM_TRANS_TYPE_REMOVEUPGRADE. TODO: kill this weird
	 * behavior. */
	pmtrans_t *tr = _alpm_trans_new();
	_alpm_log(PM_LOG_DEBUG, "removing old package first (%s-%s)",
			oldpkg->name, oldpkg->version);

	if(!tr) {
		RET_ERR(PM_ERR_TRANS_ABORT, -1);
	}

	if(_alpm_trans_init(tr, PM_TRANS_TYPE_REMOVEUPGRADE, trans->flags,
				NULL, NULL, NULL) == -1) {
		_alpm_trans_free(tr);
		tr = NULL;
		RET_ERR(PM_ERR_TRANS_ABORT, -1);
	}

	if(_alpm_remove_loadtarget(tr, db, newpkg->name) == -1) {
		_alpm_trans_free(tr);
		tr = NULL;
		RET_ERR(PM_ERR_TRANS_ABORT, -1);
	}

	/* copy the remove skiplist over */
	tr->skip_remove = alpm_list_strdup(trans->skip_remove);
	const alpm_list_t *b;

	/* Add files in the NEW package's backup array to the noupgrade array
	 * so this removal operation doesn't kill them */
	/* TODO if we add here, all backup=() entries for all targets, new and
	 * old, we cover all bases, including backup=() locations changing hands.
	 * But is this viable? */
	alpm_list_t *old_noupgrade = alpm_list_strdup(handle->noupgrade);
	for(b = alpm_pkg_get_backup(newpkg); b; b = b->next) {
		const char *backup = b->data;
		_alpm_log(PM_LOG_DEBUG, "adding %s to the NoUpgrade array temporarily",
				backup);
		handle->noupgrade = alpm_list_add(handle->noupgrade, strdup(backup));
	}

	int ret = _alpm_remove_commit(tr, db);

	_alpm_trans_free(tr);
	tr = NULL;

	/* restore our "NoUpgrade" list to previous state */
	alpm_list_free_inner(handle->noupgrade, free);
	alpm_list_free(handle->noupgrade);
	handle->noupgrade = old_noupgrade;

	if(ret == -1) {
		RET_ERR(PM_ERR_TRANS_ABORT, -1);
	}

	return(0);
}

static int extract_single_file(struct archive *archive,
		struct archive_entry *entry, pmpkg_t *newpkg, pmpkg_t *oldpkg,
		pmtrans_t *trans, pmdb_t *db)
{
	const char *entryname; /* the name of the file in the archive */
	mode_t entrymode;
	char filename[PATH_MAX]; /* the actual file we're extracting */
	int needbackup = 0, notouch = 0;
	char *hash_orig = NULL;
	const int archive_flags = ARCHIVE_EXTRACT_OWNER |
	                          ARCHIVE_EXTRACT_PERM |
	                          ARCHIVE_EXTRACT_TIME;
	int errors = 0;

	entryname = archive_entry_pathname(entry);
	entrymode = archive_entry_mode(entry);

	memset(filename, 0, PATH_MAX); /* just to be sure */

	if(strcmp(entryname, ".INSTALL") == 0) {
		/* the install script goes inside the db */
		snprintf(filename, PATH_MAX, "%s/%s-%s/install", db->path,
				newpkg->name, newpkg->version);
	} else if(strcmp(entryname, ".CHANGELOG") == 0) {
		/* the changelog goes inside the db */
		snprintf(filename, PATH_MAX, "%s/%s-%s/changelog", db->path,
				newpkg->name, newpkg->version);
	} else if(*entryname == '.') {
		/* for now, ignore all files starting with '.' that haven't
		 * already been handled (for future possibilities) */
		_alpm_log(PM_LOG_DEBUG, "skipping extraction of '%s'", entryname);
		archive_read_data_skip(archive);
		return(0);
	} else {
		/* build the new entryname relative to handle->root */
		snprintf(filename, PATH_MAX, "%s%s", handle->root, entryname);
	}

	/* if a file is in NoExtract then we never extract it */
	if(alpm_list_find_str(handle->noextract, entryname)) {
		_alpm_log(PM_LOG_DEBUG, "%s is in NoExtract, skipping extraction",
				entryname);
		alpm_logaction("note: %s is in NoExtract, skipping extraction",
				entryname);
		archive_read_data_skip(archive);
		return(0);
	}

	/* if a file is in the add skiplist we never extract it */
	if(alpm_list_find_str(trans->skip_add, filename)) {
		_alpm_log(PM_LOG_DEBUG, "%s is in trans->skip_add, skipping extraction", entryname);
		archive_read_data_skip(archive);
		return(0);
	}

	/* Check for file existence. This is one of the more crucial parts
	 * to get 'right'. Here are the possibilities, with the filesystem
	 * on the left and the package on the top:
	 * (F=file, N=node, S=symlink, D=dir)
	 *               |  F/N  |  S  |  D
	 *  non-existent |   1   |  2  |  3
	 *  F/N          |   4   |  5  |  6
	 *  S            |   7   |  8  |  9
	 *  D            |   10  |  11 |  12
	 *
	 *  1,2,3- just extract, no magic necessary. lstat will fail here.
	 *  4,5,6,7,8- conflict checks should have caught this. either overwrite
	 *      or backup the file.
	 *  9- follow the symlink, hopefully it is a directory, check it.
	 *  10- file replacing directory- don't allow it.
	 *  11- don't extract symlink- a dir exists here. we don't want links to
	 *      links, etc.
	 *  12- skip extraction, dir already exists.
	 */
	struct stat lsbuf;
	if(lstat(filename, &lsbuf) != 0) {
		/* cases 1,2,3: couldn't stat an existing file, skip all backup checks */
	} else {
		/* do a stat as well, so we can see what symlinks point to */
		struct stat sbuf;
		stat(filename, &sbuf);

		if(S_ISDIR(lsbuf.st_mode) && S_ISDIR(entrymode)) {
			/* case 12: existing dir, ignore it */
			if(lsbuf.st_mode != entrymode) {
				/* if filesystem perms are different than pkg perms, warn user */
				int mask = 07777;
				_alpm_log(PM_LOG_WARNING, _("directory permissions differ on %s\n"
							"filesystem: %o  package: %o"), entryname, lsbuf.st_mode & mask,
						entrymode & mask);
				alpm_logaction("warning: directory permissions differ on %s\n"
							"filesystem: %o  package: %o", entryname, lsbuf.st_mode & mask,
						entrymode & mask);
			}
			_alpm_log(PM_LOG_DEBUG, "extract: skipping dir extraction of %s",
					entryname);
			archive_read_data_skip(archive);
			return(0);
		} else if(S_ISDIR(lsbuf.st_mode) && S_ISLNK(entrymode)) {
			/* case 11: existing dir, symlink in package, ignore it */
			_alpm_log(PM_LOG_DEBUG, "extract: skipping symlink extraction of %s",
					entryname);
			archive_read_data_skip(archive);
			return(0);
		} else if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(entrymode)) {
			/* case 9: existing symlink, dir in package */
			if(S_ISDIR(sbuf.st_mode)) {
				/* the symlink on FS is to a directory, so we'll use it */
				_alpm_log(PM_LOG_DEBUG, "extract: skipping symlink overwrite of %s",
						entryname);
				archive_read_data_skip(archive);
				return(0);
			} else {
				/* this is BAD. symlink was not to a directory */
				_alpm_log(PM_LOG_ERROR, _("extract: symlink %s does not point to dir"),
						entryname);
				archive_read_data_skip(archive);
				return(1);
			}
		} else if(S_ISDIR(lsbuf.st_mode) && S_ISREG(entrymode)) {
			/* case 10: trying to overwrite dir tree with file, don't allow it */
			_alpm_log(PM_LOG_ERROR, _("extract: not overwriting dir with file %s"),
					entryname);
			archive_read_data_skip(archive);
			return(1);
		} else if(S_ISREG(lsbuf.st_mode) && S_ISDIR(entrymode)) {
			/* case 6: trying to overwrite file with dir */
			_alpm_log(PM_LOG_DEBUG, "extract: overwriting file with dir %s",
					entryname);
		} else if(S_ISREG(entrymode)) {
			/* case 4,7: */
			/* if file is in NoUpgrade, don't touch it */
			if(alpm_list_find_str(handle->noupgrade, entryname)) {
				notouch = 1;
			} else {
				/* go to the backup array and see if our conflict is there */
				/* check newpkg first, so that adding backup files is retroactive */
				needbackup = alpm_list_find_str(alpm_pkg_get_backup(newpkg), entryname);

				/* check oldpkg for a backup entry, store the hash if available */
				if(oldpkg) {
					hash_orig = _alpm_needbackup(entryname, alpm_pkg_get_backup(oldpkg));
					if(hash_orig) {
						needbackup = 1;
					}
				}

				/* if we force hash_orig to be non-NULL retroactive backup works */
				if(needbackup && !hash_orig) {
					hash_orig = strdup("");
				}
			}
		}
		/* else if(S_ISLNK(entrymode)) { */
		/* case 5,8: don't need to do anything special */
	}

	if(needbackup) {
		char *tempfile = NULL;
		char *hash_local = NULL, *hash_pkg = NULL;
		int fd;

		/* extract the package's version to a temporary file and checksum it */
		tempfile = strdup("/tmp/alpm_XXXXXX");
		fd = mkstemp(tempfile);

		archive_entry_set_pathname(entry, tempfile);

		int ret = archive_read_extract(archive, entry, archive_flags);
		if(ret == ARCHIVE_WARN) {
			/* operation succeeded but a non-critical error was encountered */
			_alpm_log(PM_LOG_DEBUG, "warning extracting %s (%s)",
					entryname, archive_error_string(archive));
		} else if(ret != ARCHIVE_OK) {
			_alpm_log(PM_LOG_ERROR, _("could not extract %s (%s)"),
					entryname, archive_error_string(archive));
			alpm_logaction("error: could not extract %s (%s)",
					entryname, archive_error_string(archive));
			unlink(tempfile);
			FREE(hash_orig);
			close(fd);
			return(1);
		}

		hash_local = _alpm_MDFile(filename);
		hash_pkg = _alpm_MDFile(tempfile);

		/* append the new md5 hash to it's respective entry
		 * in newpkg's backup (it will be the new orginal) */
		alpm_list_t *backups;
		for(backups = alpm_pkg_get_backup(newpkg); backups;
				backups = alpm_list_next(backups)) {
			char *oldbackup = alpm_list_getdata(backups);
			if(!oldbackup || strcmp(oldbackup, entryname) != 0) {
				return(0);
			}
			char *backup = NULL;
			int backup_len = strlen(oldbackup) + 34; /* tab char, null byte and MD5 (32 char) */
			backup = malloc(backup_len);
			if(!backup) {
				RET_ERR(PM_ERR_MEMORY, -1);
			}

			sprintf(backup, "%s\t%s", oldbackup, hash_pkg);
			backup[backup_len-1] = '\0';
			FREE(oldbackup);
			backups->data = backup;
		}

		_alpm_log(PM_LOG_DEBUG, "checking hashes for %s", entryname);
		_alpm_log(PM_LOG_DEBUG, "current:  %s", hash_local);
		_alpm_log(PM_LOG_DEBUG, "new:      %s", hash_pkg);
		_alpm_log(PM_LOG_DEBUG, "original: %s", hash_orig);

		if(!oldpkg) {
			/* looks like we have a local file that has a different hash as the
			 * file in the package, move it to a .pacorig */
			if(strcmp(hash_local, hash_pkg) != 0) {
				char newpath[PATH_MAX];
				snprintf(newpath, PATH_MAX, "%s.pacorig", filename);

				/* move the existing file to the "pacorig" */
				if(rename(filename, newpath)) {
					archive_entry_set_pathname(entry, filename);
					_alpm_log(PM_LOG_ERROR, _("could not rename %s (%s)"), filename, strerror(errno));
					alpm_logaction("error: could not rename %s (%s)", filename, strerror(errno));
					errors++;
				} else {
					/* copy the tempfile we extracted to the real path */
					if(_alpm_copyfile(tempfile, filename)) {
						archive_entry_set_pathname(entry, filename);
						_alpm_log(PM_LOG_ERROR, _("could not copy tempfile to %s (%s)"), filename, strerror(errno));
						alpm_logaction("error: could not copy tempfile to %s (%s)", filename, strerror(errno));
						errors++;
					} else {
						archive_entry_set_pathname(entry, filename);
						_alpm_log(PM_LOG_WARNING, _("%s saved as %s"), filename, newpath);
						alpm_logaction("warning: %s saved as %s", filename, newpath);
					}
				}
			}
		} else if(hash_orig) {
			/* the fun part */

			if(strcmp(hash_orig, hash_local) == 0) {
				/* installed file has NOT been changed by user */
				if(strcmp(hash_orig, hash_pkg) != 0) {
					_alpm_log(PM_LOG_DEBUG, "action: installing new file: %s",
							entryname);

					if(_alpm_copyfile(tempfile, filename)) {
						_alpm_log(PM_LOG_ERROR, _("could not copy tempfile to %s (%s)"), filename, strerror(errno));
						errors++;
					}
					archive_entry_set_pathname(entry, filename);
				} else {
					/* there's no sense in installing the same file twice, install
					 * ONLY is the original and package hashes differ */
					_alpm_log(PM_LOG_DEBUG, "action: leaving existing file in place");
				}
			} else if(strcmp(hash_orig, hash_pkg) == 0) {
				/* originally installed file and new file are the same - this
				 * implies the case above failed - i.e. the file was changed by a
				 * user */
				_alpm_log(PM_LOG_DEBUG, "action: leaving existing file in place");
			} else if(strcmp(hash_local, hash_pkg) == 0) {
				/* this would be magical.  The above two cases failed, but the
				 * user changes just so happened to make the new file exactly the
				 * same as the one in the package... skip it */
				_alpm_log(PM_LOG_DEBUG, "action: leaving existing file in place");
			} else {
				char newpath[PATH_MAX];
				_alpm_log(PM_LOG_DEBUG, "action: keeping current file and installing new one with .pacnew ending");
				snprintf(newpath, PATH_MAX, "%s.pacnew", filename);
				if(_alpm_copyfile(tempfile, newpath)) {
					_alpm_log(PM_LOG_ERROR, _("could not install %s as %s: %s"), filename, newpath, strerror(errno));
					alpm_logaction("error: could not install %s as %s: %s", filename, newpath, strerror(errno));
				} else {
					_alpm_log(PM_LOG_WARNING, _("%s installed as %s"), filename, newpath);
					alpm_logaction("warning: %s installed as %s", filename, newpath);
				}
			}
		}

		FREE(hash_local);
		FREE(hash_pkg);
		FREE(hash_orig);
		unlink(tempfile);
		FREE(tempfile);
		close(fd);
	} else {
		/* we didn't need a backup */
		if(notouch) {
			/* change the path to a .pacnew extension */
			_alpm_log(PM_LOG_DEBUG, "%s is in NoUpgrade -- skipping", filename);
			_alpm_log(PM_LOG_WARNING, _("extracting %s as %s.pacnew"), filename, filename);
			alpm_logaction("warning: extracting %s as %s.pacnew", filename, filename);
			strncat(filename, ".pacnew", PATH_MAX - strlen(filename));
		} else {
			_alpm_log(PM_LOG_DEBUG, "extracting %s", filename);
		}

		if(trans->flags & PM_TRANS_FLAG_FORCE) {
			/* if FORCE was used, unlink() each file (whether it's there
			 * or not) before extracting. This prevents the old "Text file busy"
			 * error that crops up if forcing a glibc or pacman upgrade. */
			unlink(filename);
		}

		archive_entry_set_pathname(entry, filename);

		int ret = archive_read_extract(archive, entry, archive_flags);
		if(ret == ARCHIVE_WARN) {
			/* operation succeeded but a non-critical error was encountered */
			_alpm_log(PM_LOG_DEBUG, "warning extracting %s (%s)",
					entryname, archive_error_string(archive));
		} else if(ret != ARCHIVE_OK) {
			_alpm_log(PM_LOG_ERROR, _("could not extract %s (%s)"),
					entryname, archive_error_string(archive));
			alpm_logaction("error: could not extract %s (%s)",
					entryname, archive_error_string(archive));
			return(1);
		}

		/* calculate an hash if this is in newpkg's backup */
		alpm_list_t *b;
		for(b = alpm_pkg_get_backup(newpkg); b; b = b->next) {
			char *backup = NULL, *hash = NULL;
			char *oldbackup = alpm_list_getdata(b);
			int backup_len = strlen(oldbackup) + 34; /* tab char, null byte and MD5 (32 char) */

			if(!oldbackup || strcmp(oldbackup, entryname) != 0) {
				return(0);
			}
			_alpm_log(PM_LOG_DEBUG, "appending backup entry for %s", filename);

			hash = _alpm_MDFile(filename);
			backup = malloc(backup_len);
			if(!backup) {
				RET_ERR(PM_ERR_MEMORY, -1);
			}

			sprintf(backup, "%s\t%s", oldbackup, hash);
			backup[backup_len-1] = '\0';
			FREE(hash);
			FREE(oldbackup);
			b->data = backup;
		}
	}
	return(errors);
}

static int commit_single_pkg(pmpkg_t *newpkg, int pkg_current, int pkg_count,
		pmtrans_t *trans, pmdb_t *db)
{
	int i, ret = 0, errors = 0;
	struct archive *archive;
	struct archive_entry *entry;
	char cwd[PATH_MAX] = "";
	char scriptlet[PATH_MAX+1];
	int is_upgrade = 0;
	double percent = 0.0;
	pmpkg_t *oldpkg = NULL;

	snprintf(scriptlet, PATH_MAX, "%s%s-%s/install", db->path,
			alpm_pkg_get_name(newpkg), alpm_pkg_get_version(newpkg));

	/* see if this is an upgrade. if so, remove the old package first */
	pmpkg_t *local = _alpm_db_get_pkgfromcache(db, newpkg->name);
	if(local) {
		is_upgrade = 1;

		EVENT(trans, PM_TRANS_EVT_UPGRADE_START, newpkg, NULL);
		_alpm_log(PM_LOG_DEBUG, "upgrading package %s-%s",
				newpkg->name, newpkg->version);

		/* we'll need to save some record for backup checks later */
		oldpkg = _alpm_pkg_dup(local);
		/* copy over the install reason (unless alldeps is set) */
	if(trans->flags & PM_TRANS_FLAG_ALLDEPS) {
		newpkg->reason = PM_PKG_REASON_DEPEND;
	} else {
		newpkg->reason = alpm_pkg_get_reason(local);
	}

		/* pre_upgrade scriptlet */
		if(alpm_pkg_has_scriptlet(newpkg) && !(trans->flags & PM_TRANS_FLAG_NOSCRIPTLET)) {
			_alpm_runscriptlet(handle->root, newpkg->origin_data.file,
					"pre_upgrade", newpkg->version, oldpkg->version, trans);
		}
	} else {
		is_upgrade = 0;

		EVENT(trans, PM_TRANS_EVT_ADD_START, newpkg, NULL);
		_alpm_log(PM_LOG_DEBUG, "adding package %s-%s",
				newpkg->name, newpkg->version);

		/* pre_install scriptlet */
		if(alpm_pkg_has_scriptlet(newpkg) && !(trans->flags & PM_TRANS_FLAG_NOSCRIPTLET)) {
			_alpm_runscriptlet(handle->root, newpkg->origin_data.file,
					"pre_install", newpkg->version, NULL, trans);
		}
	}

	if(oldpkg) {
		/* set up fake remove transaction */
		int ret = upgrade_remove(oldpkg, newpkg, trans, db);
		if(ret != 0) {
			return(ret);
		}
	}

	if(!(trans->flags & PM_TRANS_FLAG_DBONLY)) {
		_alpm_log(PM_LOG_DEBUG, "extracting files");

		if ((archive = archive_read_new()) == NULL) {
			RET_ERR(PM_ERR_LIBARCHIVE_ERROR, -1);
		}

		archive_read_support_compression_all(archive);
		archive_read_support_format_all(archive);

		if(archive_read_open_filename(archive, newpkg->origin_data.file,
					ARCHIVE_DEFAULT_BYTES_PER_BLOCK) != ARCHIVE_OK) {
			RET_ERR(PM_ERR_PKG_OPEN, -1);
		}

		/* save the cwd so we can restore it later */
		if(getcwd(cwd, PATH_MAX) == NULL) {
			_alpm_log(PM_LOG_ERROR, _("could not get current working directory"));
			cwd[0] = 0;
		}

		/* libarchive requires this for extracting hard links */
		chdir(handle->root);

		/* call PROGRESS once with 0 percent, as we sort-of skip that here */
		if(is_upgrade) {
			PROGRESS(trans, PM_TRANS_PROGRESS_UPGRADE_START,
					alpm_pkg_get_name(newpkg), 0, pkg_count, pkg_current);
		} else {
			PROGRESS(trans, PM_TRANS_PROGRESS_ADD_START,
					alpm_pkg_get_name(newpkg), 0, pkg_count, pkg_current);
		}

		for(i = 0; archive_read_next_header(archive, &entry) == ARCHIVE_OK; i++) {
			if(newpkg->size != 0) {
				/* Using compressed size for calculations here, as newpkg->isize is not
				 * exact when it comes to comparing to the ACTUAL uncompressed size
				 * (missing metadata sizes) */
				unsigned long pos = archive_position_compressed(archive);
				percent = (double)pos / (double)newpkg->size;
				_alpm_log(PM_LOG_DEBUG, "decompression progress: %f%% (%ld / %ld)",
						percent*100.0, pos, newpkg->size);
				if(percent >= 1.0) {
					percent = 1.0;
				}
			}

			if(is_upgrade) {
				PROGRESS(trans, PM_TRANS_PROGRESS_UPGRADE_START,
						alpm_pkg_get_name(newpkg), (int)(percent * 100), pkg_count,
						pkg_current);
			} else {
				PROGRESS(trans, PM_TRANS_PROGRESS_ADD_START,
						alpm_pkg_get_name(newpkg), (int)(percent * 100), pkg_count,
						pkg_current);
			}

			/* extract the next file from the archive */
			errors += extract_single_file(archive, entry, newpkg, oldpkg,
					trans, db);
		}
		archive_read_finish(archive);

		/* restore the old cwd is we have it */
		if(strlen(cwd)) {
			chdir(cwd);
		}

		if(errors) {
			ret = 1;
			if(is_upgrade) {
				_alpm_log(PM_LOG_ERROR, _("problem occurred while upgrading %s"),
						newpkg->name);
				alpm_logaction("error: problem occurred while upgrading %s",
						newpkg->name);
			} else {
				_alpm_log(PM_LOG_ERROR, _("problem occurred while installing %s"),
						newpkg->name);
				alpm_logaction("error: problem occurred while installing %s",
						newpkg->name);
			}
		}
	}

	/* Update the requiredby field by scanning the whole database
	 * looking for packages depending on the package to add */
	_alpm_pkg_update_requiredby(newpkg);

	/* special case: if our provides list has changed from oldpkg to newpkg AND
	 * we get here, we need to make sure we find the actual provision that
	 * still satisfies this case, and update its 'requiredby' field... ugh */
	/* TODO this seems really messy and should be taken care of elsewhere */
	alpm_list_t *provdiff, *prov;
	provdiff = alpm_list_diff(alpm_pkg_get_provides(oldpkg),
			alpm_pkg_get_provides(newpkg),
			_alpm_str_cmp);
	for(prov = provdiff; prov; prov = prov->next) {
		const char *provname = prov->data;
		_alpm_log(PM_LOG_DEBUG, "provision '%s' has been removed from package %s (%s => %s)",
				provname, alpm_pkg_get_name(oldpkg),
				alpm_pkg_get_version(oldpkg), alpm_pkg_get_version(newpkg));

		alpm_list_t *p = _alpm_db_whatprovides(handle->db_local, provname);
		if(p) {
			/* we now have all the provisions in the local DB for this virtual
			 * package... seeing as we can't really determine which is the 'correct'
			 * provision, we'll use the FIRST for now.
			 * TODO figure out a way to find a "correct" provision */
			pmpkg_t *provpkg = p->data;
			const char *pkgname = alpm_pkg_get_name(provpkg);
			_alpm_log(PM_LOG_DEBUG, "updating '%s' due to provision change (%s)",
					pkgname, provname);
			_alpm_pkg_update_requiredby(provpkg);

			if(_alpm_db_write(db, provpkg, INFRQ_DEPENDS)) {
				_alpm_log(PM_LOG_ERROR, _("could not update provision '%s' from '%s'"),
						provname, pkgname);
				alpm_logaction("error: could not update provision '%s' from '%s'",
						provname, pkgname);
				RET_ERR(PM_ERR_DB_WRITE, -1);
			}
		}
	}
	alpm_list_free(provdiff);

	/* make an install date (in UTC) */
	time_t t = time(NULL);
	strncpy(newpkg->installdate, asctime(gmtime(&t)), PKG_DATE_LEN);
	/* remove the extra line feed appended by asctime() */
	newpkg->installdate[strlen(newpkg->installdate)-1] = 0;

	_alpm_log(PM_LOG_DEBUG, "updating database");
	_alpm_log(PM_LOG_DEBUG, "adding database entry '%s'", newpkg->name);

	if(_alpm_db_write(db, newpkg, INFRQ_ALL)) {
		_alpm_log(PM_LOG_ERROR, _("could not update database entry %s-%s"),
				alpm_pkg_get_name(newpkg), alpm_pkg_get_version(newpkg));
		alpm_logaction("error: could not update database entry %s-%s",
				alpm_pkg_get_name(newpkg), alpm_pkg_get_version(newpkg));
		RET_ERR(PM_ERR_DB_WRITE, -1);
	}

	if(_alpm_db_add_pkgincache(db, newpkg) == -1) {
		_alpm_log(PM_LOG_ERROR, _("could not add entry '%s' in cache"),
				alpm_pkg_get_name(newpkg));
	}

	/* update dependency packages' REQUIREDBY fields */
	_alpm_trans_update_depends(trans, newpkg);

	if(is_upgrade) {
		PROGRESS(trans, PM_TRANS_PROGRESS_UPGRADE_START,
				alpm_pkg_get_name(newpkg), 100, pkg_count, pkg_current);
	} else {
		PROGRESS(trans, PM_TRANS_PROGRESS_ADD_START,
				alpm_pkg_get_name(newpkg), 100, pkg_count, pkg_current);
	}
	EVENT(trans, PM_TRANS_EVT_EXTRACT_DONE, NULL, NULL);

	/* run the post-install script if it exists  */
	if(alpm_pkg_has_scriptlet(newpkg)
			&& !(trans->flags & PM_TRANS_FLAG_NOSCRIPTLET)) {
		if(is_upgrade) {
			_alpm_runscriptlet(handle->root, scriptlet, "post_upgrade",
					alpm_pkg_get_version(newpkg),
					oldpkg ? alpm_pkg_get_version(oldpkg) : NULL, trans);
		} else {
			_alpm_runscriptlet(handle->root, scriptlet, "post_install",
					alpm_pkg_get_version(newpkg), NULL, trans);
		}
	}

	if(is_upgrade) {
		EVENT(trans, PM_TRANS_EVT_UPGRADE_DONE, newpkg, oldpkg);
	} else {
		EVENT(trans, PM_TRANS_EVT_ADD_DONE, newpkg, oldpkg);
	}

	_alpm_pkg_free(oldpkg);

	return(0);
}

int _alpm_add_commit(pmtrans_t *trans, pmdb_t *db)
{
	int pkg_count, pkg_current;
	alpm_list_t *targ;

	ALPM_LOG_FUNC;

	ASSERT(trans != NULL, RET_ERR(PM_ERR_TRANS_NULL, -1));
	ASSERT(db != NULL, RET_ERR(PM_ERR_DB_NULL, -1));

	if(trans->packages == NULL) {
		return(0);
	}

	pkg_count = alpm_list_count(trans->targets);
	pkg_current = 1;

	/* loop through our package list adding/upgrading one at a time */
	for(targ = trans->packages; targ; targ = targ->next) {
		if(handle->trans->state == STATE_INTERRUPTED) {
			break;
		}

		pmpkg_t *newpkg = (pmpkg_t *)targ->data;
		commit_single_pkg(newpkg, pkg_current, pkg_count, trans, db);
		pkg_current++;
	}

	/* run ldconfig if it exists */
	if(handle->trans->state != STATE_INTERRUPTED) {
		_alpm_log(PM_LOG_DEBUG, "running \"ldconfig -r %s\"", handle->root);
		_alpm_ldconfig(handle->root);
	}

	return(0);
}

/* vim: set ts=2 sw=2 noet: */