From 8a9ce12a27970beb644952a83d27f54d1d7f751a Mon Sep 17 00:00:00 2001 From: Dan McGee Date: Wed, 26 Oct 2011 17:32:46 -0500 Subject: Fix issues with replacing unowned symlinks There aretwo seperate issues in the same block of file conflict checking code here: 1) If realpath errored, such as when a symlink was broken, we would call 'continue' rather than simply exit this particular method of resolution. This was likely just a copy-paste mistake as the previous resolving steps all use loops where continue makes sense. Refactor the check so we only proceed if realpath is successful, and continue with the rest of the checks either way. 2) The real problem this code was trying to solve was canonicalizing path component (e.g., directory) symlinks. The final component, if not a directory, should not be handled at all in this loop. Add a !S_ISLNK() condition to the loop so we only call this for real files. There are few other small cleanups to the debug messages that I made while debugging this problem- we don't need to keep printing the file name, and ensure every block that sets resolved_conflict to true prints a debug message so we know how it was resolved. This fixes the expected failures from symlink010.py and symlink011.py, while still ensuring the fix for fileconflict007.py works. Signed-off-by: Dan McGee --- lib/libalpm/conflict.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) (limited to 'lib') diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c index 14c23f45..32f6f303 100644 --- a/lib/libalpm/conflict.c +++ b/lib/libalpm/conflict.c @@ -469,16 +469,18 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, continue; } + _alpm_log(handle, ALPM_LOG_DEBUG, "checking possible conflict: %s\n", path); + if(S_ISDIR(file->mode)) { struct stat sbuf; if(S_ISDIR(lsbuf.st_mode)) { - _alpm_log(handle, ALPM_LOG_DEBUG, "%s is a directory, not a conflict\n", path); + _alpm_log(handle, ALPM_LOG_DEBUG, "file is a directory, not a conflict\n"); continue; } stat(path, &sbuf); if(S_ISLNK(lsbuf.st_mode) && S_ISDIR(sbuf.st_mode)) { _alpm_log(handle, ALPM_LOG_DEBUG, - "%s is a symlink to a dir, hopefully not a conflict\n", path); + "file is a symlink to a dir, hopefully not a conflict\n"); continue; } /* if we made it to here, we want all subsequent path comparisons to @@ -487,7 +489,6 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, path[strlen(path) - 1] = '\0'; } - _alpm_log(handle, ALPM_LOG_DEBUG, "checking possible conflict: %s\n", path); relative_path = path + strlen(handle->root); /* Check remove list (will we remove the conflicting local file?) */ @@ -496,7 +497,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, if(rempkg && _alpm_filelist_contains(alpm_pkg_get_files(rempkg), relative_path)) { _alpm_log(handle, ALPM_LOG_DEBUG, - "local file will be removed, not a conflict: %s\n", path); + "local file will be removed, not a conflict\n"); resolved_conflict = 1; } } @@ -517,7 +518,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, handle->trans->skip_remove = alpm_list_add(handle->trans->skip_remove, strdup(filestr)); _alpm_log(handle, ALPM_LOG_DEBUG, - "file changed packages, adding to remove skiplist: %s\n", path); + "file changed packages, adding to remove skiplist\n"); resolved_conflict = 1; } } @@ -535,16 +536,20 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, free(dir); } - if(!resolved_conflict && dbpkg) { + /* check if a component of the filepath was a link. canonicalize the path + * and look for it in the old package. note that the actual file under + * consideration cannot itself be a link, as it might be unowned- path + * components can be safely checked as all directories are "unowned". */ + if(!resolved_conflict && dbpkg && !S_ISLNK(lsbuf.st_mode)) { char *rpath = calloc(PATH_MAX, sizeof(char)); const char *relative_rpath; - if(!realpath(path, rpath)) { - free(rpath); - continue; - } - relative_rpath = rpath + strlen(handle->root); - if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), relative_rpath)) { - resolved_conflict = 1; + if(realpath(path, rpath)) { + relative_rpath = rpath + strlen(handle->root); + if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), relative_rpath)) { + _alpm_log(handle, ALPM_LOG_DEBUG, + "package contained the resolved realpath\n"); + resolved_conflict = 1; + } } free(rpath); } @@ -560,7 +565,7 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, } if(!found) { _alpm_log(handle, ALPM_LOG_DEBUG, - "file was unowned but in new backup list: %s\n", path); + "file was unowned but in new backup list\n"); resolved_conflict = 1; } } -- cgit v1.2.3-70-g09d2