* Copyright (c) 2005, 2006 Rene Scharfe
*/
#include "cache.h"
+#include "config.h"
#include "tar.h"
#include "archive.h"
#include "streaming.h"
static int write_tar_filter_archive(const struct archiver *ar,
struct archiver_args *args);
+/*
+ * This is the max value that a ustar size header can specify, as it is fixed
+ * at 11 octal digits. POSIX specifies that we switch to extended headers at
+ * this size.
+ *
+ * Likewise for the mtime (which happens to use a buffer of the same size).
+ */
+#if ULONG_MAX == 0xFFFFFFFF
+#define USTAR_MAX_SIZE ULONG_MAX
+#else
+#define USTAR_MAX_SIZE 077777777777UL
+#endif
+#if TIME_MAX == 0xFFFFFFFF
+#define USTAR_MAX_MTIME TIME_MAX
+#else
+#define USTAR_MAX_MTIME 077777777777ULL
+#endif
+
/* writes out the whole block, but only if it is full */
static void write_if_needed(void)
{
* queues up writes, so that all our write(2) calls write exactly one
* full block; pads writes to RECORDSIZE
*/
-static int stream_blocked(const unsigned char *sha1)
+static int stream_blocked(const struct object_id *oid)
{
struct git_istream *st;
enum object_type type;
char buf[BLOCKSIZE];
ssize_t readlen;
- st = open_istream(sha1, &type, &sz, NULL);
+ st = open_istream(oid, &type, &sz, NULL);
if (!st)
- return error("cannot stream blob %s", sha1_to_hex(sha1));
+ return error("cannot stream blob %s", oid_to_hex(oid));
for (;;) {
readlen = read_istream(st, buf, sizeof(buf));
if (readlen <= 0)
strbuf_addch(sb, '\n');
}
+/*
+ * Like strbuf_append_ext_header, but for numeric values.
+ */
+static void strbuf_append_ext_header_uint(struct strbuf *sb,
+ const char *keyword,
+ uintmax_t value)
+{
+ char buf[40]; /* big enough for 2^128 in decimal, plus NUL */
+ int len;
+
+ len = xsnprintf(buf, sizeof(buf), "%"PRIuMAX, value);
+ strbuf_append_ext_header(sb, keyword, buf, len);
+}
+
static unsigned int ustar_header_chksum(const struct ustar_header *header)
{
const unsigned char *p = (const unsigned char *)header;
xsnprintf(header->chksum, sizeof(header->chksum), "%07o", ustar_header_chksum(header));
}
-static int write_extended_header(struct archiver_args *args,
- const unsigned char *sha1,
- const void *buffer, unsigned long size)
+static void write_extended_header(struct archiver_args *args,
+ const struct object_id *oid,
+ const void *buffer, unsigned long size)
{
struct ustar_header header;
unsigned int mode;
memset(&header, 0, sizeof(header));
*header.typeflag = TYPEFLAG_EXT_HEADER;
mode = 0100666;
- xsnprintf(header.name, sizeof(header.name), "%s.paxheader", sha1_to_hex(sha1));
+ xsnprintf(header.name, sizeof(header.name), "%s.paxheader", oid_to_hex(oid));
prepare_header(args, &header, mode, size);
write_blocked(&header, sizeof(header));
write_blocked(buffer, size);
- return 0;
}
static int write_tar_entry(struct archiver_args *args,
- const unsigned char *sha1,
+ const struct object_id *oid,
const char *path, size_t pathlen,
unsigned int mode)
{
struct ustar_header header;
struct strbuf ext_header = STRBUF_INIT;
unsigned int old_mode = mode;
- unsigned long size;
+ unsigned long size, size_in_header;
void *buffer;
int err = 0;
mode = (mode | ((mode & 0100) ? 0777 : 0666)) & ~tar_umask;
} else {
return error("unsupported file mode: 0%o (SHA1: %s)",
- mode, sha1_to_hex(sha1));
+ mode, oid_to_hex(oid));
}
if (pathlen > sizeof(header.name)) {
size_t plen = get_path_prefix(path, pathlen,
memcpy(header.name, path + plen + 1, rest);
} else {
xsnprintf(header.name, sizeof(header.name), "%s.data",
- sha1_to_hex(sha1));
+ oid_to_hex(oid));
strbuf_append_ext_header(&ext_header, "path",
path, pathlen);
}
memcpy(header.name, path, pathlen);
if (S_ISREG(mode) && !args->convert &&
- sha1_object_info(sha1, &size) == OBJ_BLOB &&
+ oid_object_info(oid, &size) == OBJ_BLOB &&
size > big_file_threshold)
buffer = NULL;
else if (S_ISLNK(mode) || S_ISREG(mode)) {
enum object_type type;
- buffer = sha1_file_to_archive(args, path, sha1, old_mode, &type, &size);
+ buffer = object_file_to_archive(args, path, oid, old_mode, &type, &size);
if (!buffer)
- return error("cannot read %s", sha1_to_hex(sha1));
+ return error("cannot read %s", oid_to_hex(oid));
} else {
buffer = NULL;
size = 0;
if (S_ISLNK(mode)) {
if (size > sizeof(header.linkname)) {
xsnprintf(header.linkname, sizeof(header.linkname),
- "see %s.paxheader", sha1_to_hex(sha1));
+ "see %s.paxheader", oid_to_hex(oid));
strbuf_append_ext_header(&ext_header, "linkpath",
buffer, size);
} else
memcpy(header.linkname, buffer, size);
}
- prepare_header(args, &header, mode, size);
+ size_in_header = size;
+ if (S_ISREG(mode) && size > USTAR_MAX_SIZE) {
+ size_in_header = 0;
+ strbuf_append_ext_header_uint(&ext_header, "size", size);
+ }
+
+ prepare_header(args, &header, mode, size_in_header);
if (ext_header.len > 0) {
- err = write_extended_header(args, sha1, ext_header.buf,
- ext_header.len);
- if (err) {
- free(buffer);
- return err;
- }
+ write_extended_header(args, oid, ext_header.buf,
+ ext_header.len);
}
strbuf_release(&ext_header);
write_blocked(&header, sizeof(header));
if (buffer)
write_blocked(buffer, size);
else
- err = stream_blocked(sha1);
+ err = stream_blocked(oid);
}
free(buffer);
return err;
}
-static int write_global_extended_header(struct archiver_args *args)
+static void write_global_extended_header(struct archiver_args *args)
{
const unsigned char *sha1 = args->commit_sha1;
struct strbuf ext_header = STRBUF_INIT;
struct ustar_header header;
unsigned int mode;
- int err = 0;
- strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
+ if (sha1)
+ strbuf_append_ext_header(&ext_header, "comment",
+ sha1_to_hex(sha1), 40);
+ if (args->time > USTAR_MAX_MTIME) {
+ strbuf_append_ext_header_uint(&ext_header, "mtime",
+ args->time);
+ args->time = USTAR_MAX_MTIME;
+ }
+
+ if (!ext_header.len)
+ return;
+
memset(&header, 0, sizeof(header));
*header.typeflag = TYPEFLAG_GLOBAL_HEADER;
mode = 0100666;
write_blocked(&header, sizeof(header));
write_blocked(ext_header.buf, ext_header.len);
strbuf_release(&ext_header);
- return err;
}
static struct archiver **tar_filters;
{
int err = 0;
- if (args->commit_sha1)
- err = write_global_extended_header(args);
- if (!err)
- err = write_archive_entries(args, write_tar_entry);
+ write_global_extended_header(args);
+ err = write_archive_entries(args, write_tar_entry);
if (!err)
write_trailer();
return err;