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util: when creating temporary filename for atomic creation of files, add an extra "#" to the name

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That way, we have a simple, somewhat reliable way to detect such
temporary files, by simply checking if they start with ".#".
This commit is contained in:
Lennart Poettering
2014-12-19 19:19:29 +01:00
parent 668c965af4
commit 8eebf6ad55
1 changed files with 9 additions and 9 deletions
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src/shared/util.c
+9 -9
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@@ -6992,18 +6992,18 @@ int tempfn_xxxxxx(const char *p, char **ret) {
* /foo/bar/waldo
*
* Into this:
* /foo/bar/.waldoXXXXXX
* /foo/bar/.#waldoXXXXXX
*/
fn = basename(p);
if (!filename_is_valid(fn))
return -EINVAL;
t = new(char, strlen(p) + 1 + 6 + 1);
t = new(char, strlen(p) + 2 + 6 + 1);
if (!t)
return -ENOMEM;
strcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), "."), fn), "XXXXXX");
strcpy(stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn), "XXXXXX");
*ret = path_kill_slashes(t);
return 0;
@@ -7023,18 +7023,18 @@ int tempfn_random(const char *p, char **ret) {
* /foo/bar/waldo
*
* Into this:
* /foo/bar/.waldobaa2a261115984a9
* /foo/bar/.#waldobaa2a261115984a9
*/
fn = basename(p);
if (!filename_is_valid(fn))
return -EINVAL;
t = new(char, strlen(p) + 1 + 16 + 1);
t = new(char, strlen(p) + 2 + 16 + 1);
if (!t)
return -ENOMEM;
x = stpcpy(stpcpy(mempcpy(t, p, fn - p), "."), fn);
x = stpcpy(stpcpy(mempcpy(t, p, fn - p), ".#"), fn);
u = random_u64();
for (i = 0; i < 16; i++) {
@@ -7059,14 +7059,14 @@ int tempfn_random_child(const char *p, char **ret) {
/* Turns this:
* /foo/bar/waldo
* Into this:
* /foo/bar/waldo/.3c2b6219aa75d7d0
* /foo/bar/waldo/.#3c2b6219aa75d7d0
*/
t = new(char, strlen(p) + 2 + 16 + 1);
t = new(char, strlen(p) + 3 + 16 + 1);
if (!t)
return -ENOMEM;
x = stpcpy(stpcpy(t, p), "/.");
x = stpcpy(stpcpy(t, p), "/.#");
u = random_u64();
for (i = 0; i < 16; i++) {