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upload-pack: add deepen-since to cut shallow repos based on time

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This should allow the user to say "create a shallow clone containing the
work from last year" (once the client side is fixed up, of course).

In theory deepen-since and deepen (aka --depth) can be used together to
draw the shallow boundary (whether it's intersection or union is up to
discussion, but if rev-list is used, it's likely intersection). However,
because deepen goes with a custom commit walker, we can't mix the two
yet.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy 2016-06-12 17:53:58 +07:00 committed by Junio C Hamano
parent 3d9ff4d736
commit 569e554be9
3 changed files with 54 additions and 3 deletions
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3
Documentation/technical/pack-protocol.txt
View File

@ -219,7 +219,8 @@ out of what the server said it could do with the first 'want' line.
shallow-line = PKT-LINE("shallow" SP obj-id)
depth-request = PKT-LINE("deepen" SP depth)
depth-request = PKT-LINE("deepen" SP depth) /
PKT-LINE("deepen-since" SP timestamp)
first-want = PKT-LINE("want" SP obj-id SP capability-list)
additional-want = PKT-LINE("want" SP obj-id)

9
Documentation/technical/protocol-capabilities.txt
View File

@ -179,6 +179,15 @@ This capability adds "deepen", "shallow" and "unshallow" commands to
the fetch-pack/upload-pack protocol so clients can request shallow
clones.
deepen-since
------------
This capability adds "deepen-since" command to fetch-pack/upload-pack
protocol so the client can request shallow clones that are cut at a
specific time, instead of depth. Internally it's equivalent of doing
"rev-list --max-age=<timestamp>" on the server side. "deepen-since"
cannot be used with "deepen".
no-progress
-----------

45
upload-pack.c
View File

@ -14,6 +14,7 @@
#include "sigchain.h"
#include "version.h"
#include "string-list.h"
#include "argv-array.h"
static const char upload_pack_usage[] = "git upload-pack [--strict] [--timeout=<n>] <dir>";
@ -629,11 +630,25 @@ static void deepen(int depth, const struct object_array *shallows)
packet_flush(1);
}
static void deepen_by_rev_list(int ac, const char **av,
struct object_array *shallows)
{
struct commit_list *result;
result = get_shallow_commits_by_rev_list(ac, av, SHALLOW, NOT_SHALLOW);
send_shallow(result);
free_commit_list(result);
send_unshallow(shallows);
packet_flush(1);
}
static void receive_needs(void)
{
struct object_array shallows = OBJECT_ARRAY_INIT;
int depth = 0;
int has_non_tip = 0;
unsigned long deepen_since = 0;
int deepen_rev_list = 0;
shallow_nr = 0;
for (;;) {
@ -670,6 +685,16 @@ static void receive_needs(void)
die("Invalid deepen: %s", line);
continue;
}
if (skip_prefix(line, "deepen-since ", &arg)) {
char *end = NULL;
deepen_since = strtoul(arg, &end, 0);
if (!end || *end || !deepen_since ||
/* revisions.c's max_age -1 is special */
deepen_since == -1)
die("Invalid deepen-since: %s", line);
deepen_rev_list = 1;
continue;
}
if (!skip_prefix(line, "want ", &arg) ||
get_sha1_hex(arg, sha1_buf))
die("git upload-pack: protocol error, "
@ -721,10 +746,26 @@ static void receive_needs(void)
if (!use_sideband && daemon_mode)
no_progress = 1;
if (depth == 0 && shallows.nr == 0)
if (depth == 0 && !deepen_rev_list && shallows.nr == 0)
return;
if (depth > 0 && deepen_rev_list)
die("git upload-pack: deepen and deepen-since cannot be used together");
if (depth > 0)
deepen(depth, &shallows);
else if (deepen_rev_list) {
struct argv_array av = ARGV_ARRAY_INIT;
int i;
argv_array_push(&av, "rev-list");
if (deepen_since)
argv_array_pushf(&av, "--max-age=%lu", deepen_since);
for (i = 0; i < want_obj.nr; i++) {
struct object *o = want_obj.objects[i].item;
argv_array_push(&av, oid_to_hex(&o->oid));
}
deepen_by_rev_list(av.argc, av.argv, &shallows);
argv_array_clear(&av);
}
else
if (shallows.nr > 0) {
int i;
@ -773,7 +814,7 @@ static int send_ref(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
static const char *capabilities = "multi_ack thin-pack side-band"
" side-band-64k ofs-delta shallow no-progress"
" side-band-64k ofs-delta shallow deepen-since no-progress"
" include-tag multi_ack_detailed";
const char *refname_nons = strip_namespace(refname);
struct object_id peeled;