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do not check odb_mkstemp return value for errors

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The odb_mkstemp function does not return an error; it dies
on failure instead. But many of its callers compare the
resulting descriptor against -1 and die themselves.

Mostly this is just pointless, but it does raise a question
when looking at the callers: if they show the results of the
"template" buffer after a failure, what's in it? The answer
is: it doesn't matter, because it cannot happen.

So let's make that clear by removing the bogus error checks.
In bitmap_writer_finish(), we can drop the error-handling
code entirely. In the other two cases, it's shared with the
open() in another code path; we can just move the
error-check next to that open() call.

And while we're at it, let's flesh out the function's
docstring a bit to make the error behavior clear.

Signed-off-by: Jeff King <peff@peff.net>
This commit is contained in:
Jeff King 2017-03-28 15:45:25 -04:00 committed by Junio C Hamano
parent e1104a5ee5
commit 892e723afd
4 changed files with 10 additions and 8 deletions
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7
builtin/index-pack.c
View File

@ -311,10 +311,11 @@ static const char *open_pack_file(const char *pack_name)
output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file), output_fd = odb_mkstemp(tmp_file, sizeof(tmp_file),
"pack/tmp_pack_XXXXXX"); "pack/tmp_pack_XXXXXX");
pack_name = xstrdup(tmp_file); pack_name = xstrdup(tmp_file);
} else } else {
output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600); output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
if (output_fd < 0) if (output_fd < 0)
die_errno(_("unable to create '%s'"), pack_name); die_errno(_("unable to create '%s'"), pack_name);
}
nothread_data.pack_fd = output_fd; nothread_data.pack_fd = output_fd;
} else { } else {
input_fd = open(pack_name, O_RDONLY); input_fd = open(pack_name, O_RDONLY);

5
cache.h
View File

@ -1674,7 +1674,10 @@ extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
extern void pack_report(void); extern void pack_report(void);
/* /*
* Create a temporary file rooted in the object database directory. * Create a temporary file rooted in the object database directory, or
* die on failure. The filename is taken from "pattern", which should have the
* usual "XXXXXX" trailer, and the resulting filename is written into the
* "template" buffer. Returns the open descriptor.
*/ */
extern int odb_mkstemp(char *template, size_t limit, const char *pattern); extern int odb_mkstemp(char *template, size_t limit, const char *pattern);

2
pack-bitmap-write.c
View File

@ -517,8 +517,6 @@ void bitmap_writer_finish(struct pack_idx_entry **index,
int fd = odb_mkstemp(tmp_file, sizeof(tmp_file), "pack/tmp_bitmap_XXXXXX"); int fd = odb_mkstemp(tmp_file, sizeof(tmp_file), "pack/tmp_bitmap_XXXXXX");
if (fd < 0)
die_errno("unable to create '%s'", tmp_file);
f = sha1fd(fd, tmp_file); f = sha1fd(fd, tmp_file);
memcpy(header.magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE)); memcpy(header.magic, BITMAP_IDX_SIGNATURE, sizeof(BITMAP_IDX_SIGNATURE));

4
pack-write.c
View File

@ -77,9 +77,9 @@ const char *write_idx_file(const char *index_name, struct pack_idx_entry **objec
} else { } else {
unlink(index_name); unlink(index_name);
fd = open(index_name, O_CREAT|O_EXCL|O_WRONLY, 0600); fd = open(index_name, O_CREAT|O_EXCL|O_WRONLY, 0600);
if (fd < 0)
die_errno("unable to create '%s'", index_name);
} }
if (fd < 0)
die_errno("unable to create '%s'", index_name);
f = sha1fd(fd, index_name); f = sha1fd(fd, index_name);
} }