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core: Clean up tmpfile creation code 

I have been seeing random failures here...not entirely sure why yet,
but this code is cleaner.
This commit is contained in:
Colin Walters 2012-12-13 15:12:51 -05:00
parent 380b54d689
commit a97211e3d0
1 changed files with 15 additions and 32 deletions
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47
src/libostree/ostree-core.c
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@ -1260,12 +1260,14 @@ ostree_create_file_from_input (GFile *dest_file,
return ret;
}
static GString *
create_tmp_string (const char *dirpath,
const char *prefix,
const char *suffix)
static char *
create_tmp_name (const char *dirpath,
const char *prefix,
const char *suffix)
{
static const char table[] = "ABCEDEFGHIJKLMNOPQRSTUVWXYZabcedefghijklmnopqrstuvwxyz0123456789";
GString *tmp_name = NULL;
guint i;
if (!prefix)
prefix = "tmp";
@ -1275,29 +1277,15 @@ create_tmp_string (const char *dirpath,
tmp_name = g_string_new (dirpath);
g_string_append_c (tmp_name, '/');
g_string_append (tmp_name, prefix);
g_string_append (tmp_name, "-XXXXXXXXXXXX.");
g_string_append (tmp_name, suffix);
return tmp_name;
}
static char *
subst_xxxxxx (const char *string)
{
static const char table[] = "ABCEDEFGHIJKLMNOPQRSTUVWXYZabcedefghijklmnopqrstuvwxyz0123456789";
char *ret = g_strdup (string);
guint8 *xxxxxx = (guint8*)strstr (ret, "XXXXXX");
g_assert (xxxxxx != NULL);
while (*xxxxxx == 'X')
for (i = 0; i < 8; i++)
{
int offset = g_random_int_range (0, sizeof (table) - 1);
*xxxxxx = (guint8)table[offset];
xxxxxx++;
g_string_append_c (tmp_name, (guint8)table[offset]);
}
g_string_append_c (tmp_name, '.');
g_string_append (tmp_name, suffix);
return ret;
return g_string_free (tmp_name, FALSE);
}
gboolean
@ -1314,22 +1302,19 @@ ostree_create_temp_file_from_input (GFile *dir,
gboolean ret = FALSE;
GError *temp_error = NULL;
int i = 0;
ot_lfree char *possible_name = NULL;
ot_lobj GFile *possible_file = NULL;
ot_lfree guchar *ret_csum = NULL;
GString *tmp_name = NULL;
tmp_name = create_tmp_string (gs_file_get_path_cached (dir),
prefix, suffix);
/* 128 attempts seems reasonable... */
for (i = 0; i < 128; i++)
{
ot_lfree char *possible_name = NULL;
if (g_cancellable_set_error_if_cancelled (cancellable, error))
goto out;
g_free (possible_name);
possible_name = subst_xxxxxx (tmp_name->str);
possible_name = create_tmp_name (gs_file_get_path_cached (dir),
prefix, suffix);
g_clear_object (&possible_file);
possible_file = g_file_get_child (dir, possible_name);
@ -1362,8 +1347,6 @@ ostree_create_temp_file_from_input (GFile *dir,
ret = TRUE;
ot_transfer_out_value(out_file, &possible_file);
out:
if (tmp_name)
g_string_free (tmp_name, TRUE);
return ret;
}