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write to a unique-ish file and then rename at the end to avoid clashes

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Arjan van de Ven
2022-08-30 00:02:56 +00:00
committed by Arjan van de Ven
parent 5c2c4c76ac
commit 72a6259228
1 changed files with 7 additions and 1 deletions
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src/diff.c
+7 -1
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@@ -396,9 +396,12 @@ int make_bsdiff_delta(char *old_filename, char *new_filename, char *delta_filena
off_t first_block;
int c_enc, d_enc, e_enc;
enc_flags_t encodings;
char delta_filename_unique[2 * PATH_MAX];
struct header_v20 large_header;
struct header_v21 small_header;
sprintf(delta_filename_unique, "%s.%i", delta_filename, getpid());
FILE *pf;
ret = lstat(old_filename, &old_stat);
@@ -411,6 +414,8 @@ int make_bsdiff_delta(char *old_filename, char *new_filename, char *delta_filena
return -1;
}
ret = 0;
if (S_ISDIR(new_stat.st_mode) || S_ISDIR(old_stat.st_mode)) {
/* no delta on symlinks ! */
return -1;
@@ -790,7 +795,7 @@ int make_bsdiff_delta(char *old_filename, char *new_filename, char *delta_filena
/* Create the patch file */
efd = open(delta_filename, O_CREAT | O_EXCL | O_WRONLY, 00644);
efd = open(delta_filename_unique, O_CREAT | O_EXCL | O_WRONLY, 00644);
if (efd < 0) {
ret = -1;
goto fulldl_free;
@@ -945,6 +950,7 @@ fulldl_close_free:
if (fclose(pf)) {
ret = -1;
}
rename(delta_filename_unique, delta_filename);
fulldl_free:
/* Free the memory we used */
munmap(old_data, old_size);