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glocalfile: Return NULL if symlink expansion fails

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find_mountpoint_for() uses current file in case of error, because
get_parent() returns NULL for error, but also if parent doesn't exist.
Return "." from get_parent() if parent doesn't exist in order to
differentiate the error state.
This commit is contained in:
Ondrej Holy 2018-09-21 17:02:05 +02:00
parent 57cfbc9341
commit b6191059b8
1 changed files with 18 additions and 10 deletions
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28
gio/glocalfile.c
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@ -1634,8 +1634,7 @@ get_parent (const char *path,
path_copy = strip_trailing_slashes (path);
parent = g_path_get_dirname (path_copy);
if (strcmp (parent, ".") == 0 ||
strcmp (parent, path_copy) == 0)
if (strcmp (parent, ".") == 0)
{
g_free (parent);
g_free (path_copy);
@ -1657,10 +1656,12 @@ expand_all_symlinks (const char *path)
dev_t parent_dev;
parent = get_parent (path, &parent_dev);
if (parent)
if (parent == NULL)
return NULL;
if (g_strcmp0 (parent, "/") != 0)
{
parent_expanded = expand_all_symlinks (parent);
g_free (parent);
basename = g_path_get_basename (path);
res = g_build_filename (parent_expanded, basename, NULL);
g_free (basename);
@ -1668,7 +1669,9 @@ expand_all_symlinks (const char *path)
}
else
res = g_strdup (path);
g_free (parent);
return res;
}
@ -1684,19 +1687,22 @@ find_mountpoint_for (const char *file,
{
dir = expand_symlinks (file, NULL);
if (dir == NULL)
return g_strdup (file);
return NULL;
}
else
dir = g_strdup (file);
dir_dev = dev;
while (1)
while (g_strcmp0 (dir, "/") != 0)
{
parent = get_parent (dir, &parent_dev);
if (parent == NULL)
return dir;
{
g_free (dir);
return NULL;
}
if (parent_dev != dir_dev)
{
g_free (parent);
@ -1706,6 +1712,8 @@ find_mountpoint_for (const char *file,
g_free (dir);
dir = parent;
}
return dir;
}
char *
@ -1773,7 +1781,7 @@ try_make_relative (const char *path,
base2 = expand_all_symlinks (base);
relative = NULL;
if (path_has_prefix (path2, base2))
if (path2 != NULL && base2 != NULL && path_has_prefix (path2, base2))
{
relative = path2 + strlen (base2);
while (*relative == '/')