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-   -   Ensure a file can be replaced by a directory (http://www.linux-archive.org/archlinux-pacman-development/544987-ensure-file-can-replaced-directory.html)

Dan McGee 06-27-2011 02:10 PM

Ensure a file can be replaced by a directory
 
This addresses FS#24904. In a normal upgrade case, this replacement
seems to work just fine. However, when doing a sync "replace" type
upgrade, we weren't properly handling this edge case due to path
comparison not ignoring trailing slashes. Fix this by pruning any
trailing slashes past a certain point of file conflict resolution where
we no longer need them, which allows us to safely detect cases such as
now tested in the new pactest.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
lib/libalpm/conflict.c | 26 ++++++++++++++++++--------
test/pacman/tests/fileconflict008.py | 21 +++++++++++++++++++++
2 files changed, 39 insertions(+), 8 deletions(-)
create mode 100644 test/pacman/tests/fileconflict008.py

diff --git a/lib/libalpm/conflict.c b/lib/libalpm/conflict.c
index b1df108..db10d32 100644
--- a/lib/libalpm/conflict.c
+++ b/lib/libalpm/conflict.c
@@ -433,7 +433,6 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,

/* declarations for second check */
struct stat lsbuf, sbuf;
- char *filestr = NULL;

/* CHECK 2: check every target against the filesystem */
_alpm_log(PM_LOG_DEBUG, "searching for filesystem conflicts: %s
", p1->name);
@@ -452,7 +451,9 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,
}

for(j = tmpfiles; j; j = j->next) {
- filestr = j->data;
+ const char *filestr = j->data, *relative_path;
+ /* have we acted on this conflict? */
+ int resolved_conflict = 0;

snprintf(path, PATH_MAX, "%s%s", handle->root, filestr);

@@ -471,16 +472,22 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,
"%s is a symlink to a dir, hopefully not a conflict
", path);
continue;
}
+ /* if we made it to here, we want all subsequent path comparisons to
+ * not include the trailing slash. This allows things like file ->
+ * directory replacements. */
+ path[strlen(path) - 1] = '';
}
- _alpm_log(PM_LOG_DEBUG, "checking possible conflict: %s
", path);

- int resolved_conflict = 0; /* have we acted on this conflict? */
+ _alpm_log(PM_LOG_DEBUG, "checking possible conflict: %s
", path);
+ relative_path = path + strlen(handle->root);

/* Check remove list (will we remove the conflicting local file?) */
for(k = remove; k && !resolved_conflict; k = k->next) {
pmpkg_t *rempkg = k->data;
- if(rempkg && alpm_list_find_str(alpm_pkg_get_files(rempkg), filestr)) {
- _alpm_log(PM_LOG_DEBUG, "local file will be removed, not a conflict: %s
", filestr);
+ if(alpm_list_find_str(alpm_pkg_get_files(rempkg), relative_path)) {
+ _alpm_log(PM_LOG_DEBUG,
+ "local file will be removed, not a conflict: %s
",
+ relative_path);
resolved_conflict = 1;
}
}
@@ -498,8 +505,11 @@ alpm_list_t *_alpm_db_find_fileconflicts(pmdb_t *db, pmtrans_t *trans,
/* skip removal of file, but not add. this will prevent a second
* package from removing the file when it was already installed
* by its new owner (whether the file is in backup array or not */
- trans->skip_remove = alpm_list_add(trans->skip_remove, strdup(filestr));
- _alpm_log(PM_LOG_DEBUG, "file changed packages, adding to remove skiplist: %s
", filestr);
+ trans->skip_remove = alpm_list_add(trans->skip_remove,
+ strdup(filestr));
+ _alpm_log(PM_LOG_DEBUG,
+ "file changed packages, adding to remove skiplist: %s
",
+ filestr);
resolved_conflict = 1;
}
}
diff --git a/test/pacman/tests/fileconflict008.py b/test/pacman/tests/fileconflict008.py
new file mode 100644
index 0000000..24ea885
--- /dev/null
+++ b/test/pacman/tests/fileconflict008.py
@@ -0,0 +1,21 @@
+self.description = "Fileconflict file -> dir on package replacement (FS#24904)"
+
+lp = pmpkg("dummy")
+lp.files = ["dir/filepath",
+ "dir/file"]
+self.addpkg2db("local", lp)
+
+p1 = pmpkg("replace")
+p1.provides = ["dummy"]
+p1.replaces = ["dummy"]
+p1.files = ["dir/filepath/",
+ "dir/filepath/file",
+ "dir/file",
+ "dir/file2"]
+self.addpkg2db("sync", p1)
+
+self.args = "-Su"
+
+self.addrule("PACMAN_RETCODE=0")
+self.addrule("!PKG_EXIST=dummy")
+self.addrule("PKG_EXIST=replace")
--
1.7.5.2


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