[PATCH 1/6] Allow pack header preprocessing before unpack-objects/index-pack.
- From
Nicolas Pitre <nico@cam.org>
- Date
- Nov 1, 2006, 22:06 UTC
- Message-ID
- <11624187853116-git-send-email-nico@cam.org>
Some applications which invoke unpack-objects or index-pack --stdin may want to examine the pack header to determine the number of objects contained in the pack and use that value to determine which executable to invoke to handle the rest of the pack stream.
However if the caller consumes the pack header from the input stream then its no longer available for unpack-objects or index-pack --stdin, both of which need the version and object count to process the stream.
This change introduces --pack_header=ver,cnt as a command line option that the caller can supply to indicate it has already consumed the pack header and what version and object count were found in that header. As this option is only meant for low level applications such as receive-pack we are not documenting it at this time.
Signed-off-by: Nicolas Pitre <nico@cam.org> ---
Patch description text shamelessly stolen from a similar patch from Shawn Pearce <spearce@spearce.org>.
builtin-unpack-objects.c | 15 +++++++++++++++ index-pack.c | 13 +++++++++++++ 2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/builtin-unpack-objects.c b/builtin-unpack-objects.c index 74a90c1..e6d7574 100644 --- a/builtin-unpack-objects.c +++ b/builtin-unpack-objects.c @@ -371,6 +371,21 @@ int cmd_unpack_objects(int argc, const c recover = 1; continue; } + if (!strncmp(arg, "--pack_header=", 14)) { + struct pack_header *hdr; + char *c; + + hdr = (struct pack_header *)buffer; + hdr->hdr_signature = htonl(PACK_SIGNATURE); + hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10)); + if (*c != ',') + die("bad %s", arg); + hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10)); + if (*c) + die("bad %s", arg); + len = sizeof(*hdr); + continue; + } usage(unpack_usage); } diff --git a/index-pack.c b/index-pack.c index b37dd78..a3b55f9 100644 --- a/index-pack.c +++ b/index-pack.c @@ -841,6 +841,19 @@ int main(int argc, char **argv) keep_msg = ""; } else if (!strncmp(arg, "--keep=", 7)) { keep_msg = arg + 7; + } else if (!strncmp(arg, "--pack_header=", 14)) { + struct pack_header *hdr; + char *c; + + hdr = (struct pack_header *)input_buffer; + hdr->hdr_signature = htonl(PACK_SIGNATURE); + hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10)); + if (*c != ',') + die("bad %s", arg); + hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10)); + if (*c) + die("bad %s", arg); + input_len = sizeof(*hdr); } else if (!strcmp(arg, "-v")) { verbose = 1; } else if (!strcmp(arg, "-o")) {
-- 1.4.3.3.g87b2-dirty