lib/zstd
1
0
Fork 0
mirror of https://github.com/facebook/zstd.git synced 2025-08-01 09:47:01 +03:00
Code Activity

Don't Block Removing File on Being Able to Read It

Browse Source 
`open()`'s mode bits are only applied to files that are created by the call.
If the output file already exists, but is not readable, the `fopen()` would
fail, preventing us from removing it, which would mean that the file would
not end up with the correct permission bits.

It's not clear to me why the `fopen()` is there at all. `UTIL_isRegularFile()`
should be sufficient, AFAICT.
This commit is contained in:
W. Felix Handte
2021-03-08 17:49:20 -05:00
parent b87f97b3ea
commit 1fb10ba831
2 changed files with 28 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

29
programs/fileio.c
View File

@ -669,7 +669,6 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
if (UTIL_isRegularFile(dstFileName)) {
/* Check if destination file already exists */
FILE* const fCheck = fopen( dstFileName, "rb" );
#if !defined(_WIN32)
/* this test does not work on Windows :
* `NUL` and `nul` are detected as regular files */
@ -678,22 +677,20 @@ FIO_openDstFile(FIO_ctx_t* fCtx, FIO_prefs_t* const prefs,
dstFileName);
}
#endif
if (fCheck != NULL) { /* dst file exists, authorization prompt */
fclose(fCheck);
if (!prefs->overwrite) {
if (g_display_prefs.displayLevel <= 1) {
/* No interaction possible */
DISPLAY("zstd: %s already exists; not overwritten \n",
dstFileName);
return NULL;
}
DISPLAY("zstd: %s already exists; ", dstFileName);
if (UTIL_requireUserConfirmation("overwrite (y/n) ? ", "Not overwritten \n", "yY", fCtx->hasStdinInput))
return NULL;
if (!prefs->overwrite) {
if (g_display_prefs.displayLevel <= 1) {
/* No interaction possible */
DISPLAY("zstd: %s already exists; not overwritten \n",
dstFileName);
return NULL;
}
/* need to unlink */
FIO_removeFile(dstFileName);
} }
DISPLAY("zstd: %s already exists; ", dstFileName);
if (UTIL_requireUserConfirmation("overwrite (y/n) ? ", "Not overwritten \n", "yY", fCtx->hasStdinInput))
return NULL;
}
/* need to unlink */
FIO_removeFile(dstFileName);
}
{ const int fd = open(dstFileName, O_WRONLY|O_CREAT|O_TRUNC, mode);
FILE* f = NULL;