git/unpack-file.c
Thomas Rast 0721c314a5 Use die_errno() instead of die() when checking syscalls
Lots of die() calls did not actually report the kind of error, which
can leave the user confused as to the real problem.  Use die_errno()
where we check a system/library call that sets errno on failure, or
one of the following that wrap such calls:

  Function              Passes on error from
  --------              --------------------
  odb_pack_keep         open
  read_ancestry         fopen
  read_in_full          xread
  strbuf_read           xread
  strbuf_read_file      open or strbuf_read_file
  strbuf_readlink       readlink
  write_in_full         xwrite

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-06-27 11:14:53 -07:00

42 lines
841 B
C

#include "cache.h"
#include "blob.h"
#include "exec_cmd.h"
static char *create_temp_file(unsigned char *sha1)
{
static char path[50];
void *buf;
enum object_type type;
unsigned long size;
int fd;
buf = read_sha1_file(sha1, &type, &size);
if (!buf || type != OBJ_BLOB)
die("unable to read blob object %s", sha1_to_hex(sha1));
strcpy(path, ".merge_file_XXXXXX");
fd = xmkstemp(path);
if (write_in_full(fd, buf, size) != size)
die_errno("unable to write temp-file");
close(fd);
return path;
}
int main(int argc, char **argv)
{
unsigned char sha1[20];
git_extract_argv0_path(argv[0]);
if (argc != 2)
usage("git unpack-file <sha1>");
if (get_sha1(argv[1], sha1))
die("Not a valid object name %s", argv[1]);
setup_git_directory();
git_config(git_default_config, NULL);
puts(create_temp_file(sha1));
return 0;
}