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Add hook routine archive_write_ar_finish() which writes the 'ar'

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global header if nothing else has been written before the closing of
the archive. This will change the behaviour when creating archives
without members, i.e., instead of generating a 0-size archive file, an
archive with just the global header (8 bytes in total) will be created
and it is indeed a valid archive by the definition of libarchive, thus
subsequent operation on this archive will be accepted. This especially
solves the failure caused by following sequence: (several ports do)

% ar cru libfoo.a  	    # without specifying obj files
% ranlib libfoo.a

Reviewed by:	kientzle, jkoshy
Approved by:	kientzle
Approved by:	jkoshy	(mentor)
Reported by:	erwin
MFC after:	1 month
This commit is contained in:
Kai Wang 2008-01-31 08:11:01 +00:00
parent fae7e96d82
commit 5f1f828a63
1 changed files with 19 additions and 1 deletions
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20
lib/libarchive/archive_write_set_format_ar.c
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@ -75,6 +75,7 @@ static int archive_write_ar_header(struct archive_write *,
static ssize_t archive_write_ar_data(struct archive_write *,
const void *buff, size_t s);
static int archive_write_ar_destroy(struct archive_write *);
static int archive_write_ar_finish(struct archive_write *);
static int archive_write_ar_finish_entry(struct archive_write *);
static const char *ar_basename(const char *path);
static int format_octal(int64_t v, char *p, int s);
@ -126,7 +127,7 @@ archive_write_set_format_ar(struct archive_write *a)
a->format_write_header = archive_write_ar_header;
a->format_write_data = archive_write_ar_data;
a->format_finish = NULL;
a->format_finish = archive_write_ar_finish;
a->format_destroy = archive_write_ar_destroy;
a->format_finish_entry = archive_write_ar_finish_entry;
return (ARCHIVE_OK);
@ -397,6 +398,23 @@ archive_write_ar_destroy(struct archive_write *a)
return (ARCHIVE_OK);
}
static int
archive_write_ar_finish(struct archive_write *a)
{
int ret;
/*
* If we haven't written anything yet, we need to write
* the ar global header now to make it a valid ar archive.
*/
if (a->archive.file_position == 0) {
ret = (a->compressor.write)(a, "!<arch>\n", 8);
return (ret);
}
return (ARCHIVE_OK);
}
static int
archive_write_ar_finish_entry(struct archive_write *a)
{