Before this patch write_tar_entry() can:
- write global header
by write_global_extended_header() calling write_tar_entry with
with both sha1 and path == NULL
- write extended header for symlinks, by write_tar_entry() calling
itself with sha1 != NULL and path == NULL
- write a normal blob. In this case both sha1 and path are valid.
After this patch, the first two call sites are modified to write the
header without calling write_tar_entry(). The function is now for
writing blobs only. This simplifies handling when write_tar_entry()
learns about large blobs.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@xxxxxxxxx>
---
archive-tar.c | 78 ++++++++++++++++++++++++++++++++++++++-------------------
1 files changed, 52 insertions(+), 26 deletions(-)
diff --git a/archive-tar.c b/archive-tar.c
index 20af005..1727ab9 100644
--- a/archive-tar.c
+++ b/archive-tar.c
@@ -123,6 +123,43 @@ static size_t get_path_prefix(const char *path, size_t pathlen, size_t maxlen)
return i;
}
+static void prepare_header(struct archiver_args *args,
+ struct ustar_header *header,
+ unsigned int mode, unsigned long size)
+{
+ sprintf(header->mode, "%07o", mode & 07777);
+ sprintf(header->size, "%011lo", S_ISREG(mode) ? size : 0);
+ sprintf(header->mtime, "%011lo", (unsigned long) args->time);
+
+ sprintf(header->uid, "%07o", 0);
+ sprintf(header->gid, "%07o", 0);
+ strlcpy(header->uname, "root", sizeof(header->uname));
+ strlcpy(header->gname, "root", sizeof(header->gname));
+ sprintf(header->devmajor, "%07o", 0);
+ sprintf(header->devminor, "%07o", 0);
+
+ memcpy(header->magic, "ustar", 6);
+ memcpy(header->version, "00", 2);
+
+ sprintf(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)
+{
+ struct ustar_header header;
+ unsigned int mode;
+ memset(&header, 0, sizeof(header));
+ *header.typeflag = TYPEFLAG_EXT_HEADER;
+ mode = 0100666;
+ sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
+ 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 char *path, size_t pathlen,
unsigned int mode, void *buffer, unsigned long size)
@@ -134,13 +171,9 @@ static int write_tar_entry(struct archiver_args *args,
memset(&header, 0, sizeof(header));
if (!sha1) {
- *header.typeflag = TYPEFLAG_GLOBAL_HEADER;
- mode = 0100666;
- strcpy(header.name, "pax_global_header");
+ die("BUG: sha1 == NULL is not supported");
} else if (!path) {
- *header.typeflag = TYPEFLAG_EXT_HEADER;
- mode = 0100666;
- sprintf(header.name, "%s.paxheader", sha1_to_hex(sha1));
+ die("BUG: path == NULL is not supported");
} else {
if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
*header.typeflag = TYPEFLAG_DIR;
@@ -182,25 +215,11 @@ static int write_tar_entry(struct archiver_args *args,
memcpy(header.linkname, buffer, size);
}
- sprintf(header.mode, "%07o", mode & 07777);
- sprintf(header.size, "%011lo", S_ISREG(mode) ? size : 0);
- sprintf(header.mtime, "%011lo", (unsigned long) args->time);
-
- sprintf(header.uid, "%07o", 0);
- sprintf(header.gid, "%07o", 0);
- strlcpy(header.uname, "root", sizeof(header.uname));
- strlcpy(header.gname, "root", sizeof(header.gname));
- sprintf(header.devmajor, "%07o", 0);
- sprintf(header.devminor, "%07o", 0);
-
- memcpy(header.magic, "ustar", 6);
- memcpy(header.version, "00", 2);
-
- sprintf(header.chksum, "%07o", ustar_header_chksum(&header));
+ prepare_header(args, &header, mode, size);
if (ext_header.len > 0) {
- err = write_tar_entry(args, sha1, NULL, 0, 0, ext_header.buf,
- ext_header.len);
+ err = write_extended_header(args, sha1, ext_header.buf,
+ ext_header.len);
if (err)
return err;
}
@@ -215,11 +234,18 @@ static int write_global_extended_header(struct archiver_args *args)
{
const unsigned char *sha1 = args->commit_sha1;
struct strbuf ext_header = STRBUF_INIT;
- int err;
+ struct ustar_header header;
+ unsigned int mode;
+ int err = 0;
strbuf_append_ext_header(&ext_header, "comment", sha1_to_hex(sha1), 40);
- err = write_tar_entry(args, NULL, NULL, 0, 0, ext_header.buf,
- ext_header.len);
+ memset(&header, 0, sizeof(header));
+ *header.typeflag = TYPEFLAG_GLOBAL_HEADER;
+ mode = 0100666;
+ strcpy(header.name, "pax_global_header");
+ prepare_header(args, &header, mode, ext_header.len);
+ write_blocked(&header, sizeof(header));
+ write_blocked(ext_header.buf, ext_header.len);
strbuf_release(&ext_header);
return err;
}
--
1.7.8.36.g69ee2
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