From 717fdb8ee0fd23cf72fc7d2832317f513caefa2c Mon Sep 17 00:00:00 2001 From: Allan McRae Date: Sun, 8 Jul 2012 21:36:36 +1000 Subject: Add conflict for replacing owned empty directory When two packages own an empty directory, pacman finds no conflict when one of those packages wants to replace the directory with a file or a symlink. When it comes to actually extracting the new file/symlink, pacman sees the directory is still there (we do not remove empty directories if they are owned by a package) and refuses to extract. Detect this potential conflict early and bail. Note that it is a _potential_ conflict and not a guaranteed one as the other package owning the directory could be updated or removed first which would remove the conflict. However, pacman currently can not sort package installation order to ensure this, so this conflict requires manual upgrade ordering. Signed-off-by: Allan McRae Signed-off-by: Dan McGee --- lib/libalpm/conflict.c | 32 ++++++++++++++++++++++++++------ 1 file changed, 26 insertions(+), 6 deletions(-) (limited to 'lib') diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c index 32f6f303..efa1a87c 100644 --- a/lib/libalpm/conflict.c +++ b/lib/libalpm/conflict.c @@ -328,15 +328,35 @@ const alpm_file_t *_alpm_filelist_contains(alpm_filelist_t *filelist, return NULL; } -static int dir_belongsto_pkg(const char *root, const char *dirpath, +static int dir_belongsto_pkg(alpm_handle_t *handle, const char *dirpath, alpm_pkg_t *pkg) { + alpm_list_t *i; struct stat sbuf; char path[PATH_MAX]; char abspath[PATH_MAX]; - struct dirent *ent = NULL; DIR *dir; + struct dirent *ent = NULL; + const char *root = handle->root; + + /* TODO: this is an overly strict check but currently pacman will not + * overwrite a directory with a file (case 10/11 in add.c). Adjusting that + * is not simple as even if the directory is being unowned by a conflicting + * package, pacman does not sort this to ensure all required directory + * "removals" happen before installation of file/symlink */ + + /* check that no other _installed_ package owns the directory */ + for(i = _alpm_db_get_pkgcache(handle->db_local); i; i = i->next) { + if(pkg == i->data) { + continue; + } + + if(_alpm_filelist_contains(alpm_pkg_get_files(i->data), dirpath)) { + return 0; + } + } + /* check all files in directory are owned by the package */ snprintf(abspath, PATH_MAX, "%s%s", root, dirpath); dir = opendir(abspath); if(dir == NULL) { @@ -349,13 +369,13 @@ static int dir_belongsto_pkg(const char *root, const char *dirpath, if(strcmp(name, ".") == 0 || strcmp(name, "..") == 0) { continue; } - snprintf(path, PATH_MAX, "%s/%s", dirpath, name); + snprintf(path, PATH_MAX, "%s%s", dirpath, name); snprintf(abspath, PATH_MAX, "%s%s", root, path); if(stat(abspath, &sbuf) != 0) { continue; } if(S_ISDIR(sbuf.st_mode)) { - if(dir_belongsto_pkg(root, path, pkg)) { + if(dir_belongsto_pkg(handle, path, pkg)) { continue; } else { closedir(dir); @@ -529,9 +549,9 @@ alpm_list_t *_alpm_db_find_fileconflicts(alpm_handle_t *handle, sprintf(dir, "%s/", filestr); if(_alpm_filelist_contains(alpm_pkg_get_files(dbpkg), dir)) { _alpm_log(handle, ALPM_LOG_DEBUG, - "check if all files in %s belongs to %s\n", + "check if all files in %s belong to %s\n", dir, dbpkg->name); - resolved_conflict = dir_belongsto_pkg(handle->root, filestr, dbpkg); + resolved_conflict = dir_belongsto_pkg(handle, dir, dbpkg); } free(dir); } -- cgit v1.2.3-70-g09d2 From 44e9fdd0e848382337edb97d41e7317638a67bac Mon Sep 17 00:00:00 2001 From: Allan McRae Date: Sun, 8 Jul 2012 23:58:37 +1000 Subject: Check empty subdirectory ownership When checking if a package owns a directory, it is important to check not only that all the files in the directory are part of the package, but also if the directory is part of a package. This catches empty subdirectories during conflict checking for directory to file/symlink replacements. Signed-off-by: Allan McRae Signed-off-by: Dan McGee --- lib/libalpm/conflict.c | 5 +++++ test/pacman/tests/fileconflict012.py | 17 +++++++++++++++++ 2 files changed, 22 insertions(+) create mode 100644 test/pacman/tests/fileconflict012.py (limited to 'lib') diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c index efa1a87c..d6e5d8c6 100644 --- a/lib/libalpm/conflict.c +++ b/lib/libalpm/conflict.c @@ -339,6 +339,11 @@ static int dir_belongsto_pkg(alpm_handle_t *handle, const char *dirpath, struct dirent *ent = NULL; const char *root = handle->root; + /* check directory is actually in package - used for subdirectory checks */ + if(!_alpm_filelist_contains(alpm_pkg_get_files(pkg), dirpath)) { + return 0; + } + /* TODO: this is an overly strict check but currently pacman will not * overwrite a directory with a file (case 10/11 in add.c). Adjusting that * is not simple as even if the directory is being unowned by a conflicting diff --git a/test/pacman/tests/fileconflict012.py b/test/pacman/tests/fileconflict012.py new file mode 100644 index 00000000..421b739a --- /dev/null +++ b/test/pacman/tests/fileconflict012.py @@ -0,0 +1,17 @@ +self.description = "dir->file change during package upgrade (filesystem file conflict)" + +lp1 = pmpkg("pkg1") +lp1.files = ["dir/"] +self.addpkg2db("local", lp1) + +self.filesystem = ["dir/file"] + +p = pmpkg("pkg1", "1.0-2") +p.files = ["dir"] +self.addpkg2db("sync", p) + +self.args = "-S pkg1" + +self.addrule("PACMAN_RETCODE=1") +self.addrule("PKG_VERSION=pkg1|1.0-1") +self.addrule("DIR_EXIST=dir/") -- cgit v1.2.3-70-g09d2