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authorJunio C Hamano <junkio@cox.net>2006-09-13 19:30:20 (GMT)
committerJunio C Hamano <junkio@cox.net>2006-09-13 19:30:20 (GMT)
commitf6e8dd3b438992d22a6a2173f8980eae9dabaf37 (patch)
treef3a53dd0165008a114dc3edf804dba0e8a2d5316 /send-pack.c
parent8a5dbef8ac24bc5a28409d646cf3ff6db0cccb3f (diff)
parentc727fe2afcb86195d72136b4b3ba4b5fea5514d5 (diff)
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Merge branch 'aw/send-pack'
* aw/send-pack: send-pack: switch to using git-rev-list --stdin
Diffstat (limited to 'send-pack.c')
-rw-r--r--send-pack.c105
1 files changed, 70 insertions, 35 deletions
diff --git a/send-pack.c b/send-pack.c
index 5172ef8..5bb123a 100644
--- a/send-pack.c
+++ b/send-pack.c
@@ -38,9 +38,8 @@ static void exec_pack_objects(void)
static void exec_rev_list(struct ref *refs)
{
- struct ref *ref;
- static const char *args[1000];
- int i = 0, j;
+ static const char *args[4];
+ int i = 0;
args[i++] = "rev-list"; /* 0 */
if (use_thin_pack) /* 1 */
@@ -48,43 +47,16 @@ static void exec_rev_list(struct ref *refs)
else
args[i++] = "--objects";
- /* First send the ones we care about most */
- for (ref = refs; ref; ref = ref->next) {
- if (900 < i)
- die("git-rev-list environment overflow");
- if (!is_zero_sha1(ref->new_sha1)) {
- char *buf = xmalloc(100);
- args[i++] = buf;
- snprintf(buf, 50, "%s", sha1_to_hex(ref->new_sha1));
- buf += 50;
- if (!is_zero_sha1(ref->old_sha1) &&
- has_sha1_file(ref->old_sha1)) {
- args[i++] = buf;
- snprintf(buf, 50, "^%s",
- sha1_to_hex(ref->old_sha1));
- }
- }
- }
+ args[i++] = "--stdin";
- /* Then a handful of the remainder
- * NEEDSWORK: we would be better off if used the newer ones first.
- */
- for (ref = refs, j = i + 16;
- i < 900 && i < j && ref;
- ref = ref->next) {
- if (is_zero_sha1(ref->new_sha1) &&
- !is_zero_sha1(ref->old_sha1) &&
- has_sha1_file(ref->old_sha1)) {
- char *buf = xmalloc(42);
- args[i++] = buf;
- snprintf(buf, 42, "^%s", sha1_to_hex(ref->old_sha1));
- }
- }
args[i] = NULL;
execv_git_cmd(args);
die("git-rev-list exec failed (%s)", strerror(errno));
}
+/*
+ * Run "rev-list --stdin | pack-objects" pipe.
+ */
static void rev_list(int fd, struct ref *refs)
{
int pipe_fd[2];
@@ -94,6 +66,9 @@ static void rev_list(int fd, struct ref *refs)
die("rev-list setup: pipe failed");
pack_objects_pid = fork();
if (!pack_objects_pid) {
+ /* The child becomes pack-objects; reads from pipe
+ * and writes to the original fd
+ */
dup2(pipe_fd[0], 0);
dup2(fd, 1);
close(pipe_fd[0]);
@@ -104,6 +79,8 @@ static void rev_list(int fd, struct ref *refs)
}
if (pack_objects_pid < 0)
die("pack-objects fork failed");
+
+ /* We become rev-list --stdin; output goes to pipe. */
dup2(pipe_fd[1], 1);
close(pipe_fd[0]);
close(pipe_fd[1]);
@@ -111,13 +88,71 @@ static void rev_list(int fd, struct ref *refs)
exec_rev_list(refs);
}
+/*
+ * Create "rev-list --stdin | pack-objects" pipe and feed
+ * the refs into the pipeline.
+ */
+static void rev_list_generate(int fd, struct ref *refs)
+{
+ int pipe_fd[2];
+ pid_t rev_list_generate_pid;
+
+ if (pipe(pipe_fd) < 0)
+ die("rev-list-generate setup: pipe failed");
+ rev_list_generate_pid = fork();
+ if (!rev_list_generate_pid) {
+ /* The child becomes the "rev-list | pack-objects"
+ * pipeline. It takes input from us, and its output
+ * goes to fd.
+ */
+ dup2(pipe_fd[0], 0);
+ dup2(fd, 1);
+ close(pipe_fd[0]);
+ close(pipe_fd[1]);
+ close(fd);
+ rev_list(fd, refs);
+ die("rev-list setup failed");
+ }
+ if (rev_list_generate_pid < 0)
+ die("rev-list-generate fork failed");
+
+ /* We feed the rev parameters to them. We do not write into
+ * fd nor read from the pipe.
+ */
+ close(pipe_fd[0]);
+ close(fd);
+ while (refs) {
+ char buf[42];
+
+ if (!is_null_sha1(refs->old_sha1) &&
+ has_sha1_file(refs->old_sha1)) {
+ memcpy(buf + 1, sha1_to_hex(refs->old_sha1), 40);
+ buf[0] = '^';
+ buf[41] = '\n';
+ write(pipe_fd[1], buf, 42);
+ }
+ if (!is_null_sha1(refs->new_sha1)) {
+ memcpy(buf, sha1_to_hex(refs->new_sha1), 40);
+ buf[40] = '\n';
+ write(pipe_fd[1], buf, 41);
+ }
+ refs = refs->next;
+ }
+ close(pipe_fd[1]);
+ // waitpid(rev_list_generate_pid);
+ exit(0);
+}
+
+/*
+ * Make a pack stream and spit it out into file descriptor fd
+ */
static void pack_objects(int fd, struct ref *refs)
{
pid_t rev_list_pid;
rev_list_pid = fork();
if (!rev_list_pid) {
- rev_list(fd, refs);
+ rev_list_generate(fd, refs);
die("rev-list setup failed");
}
if (rev_list_pid < 0)