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git/pull: fetch all branches (please test)

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there was a diff that went in a while ago to improve
this, but it got backed out because it encounters a
bug in upstream git -- the spec says that a single
ACK should be sent when not using multi-ack modes,
but they send back multiple ones.

This commit brings back the functionality, and works
around the upstream git bug in two different ways.

First, it skips the packets up until it finds the
start of a pack header.

Second, it deduplicates the want messages, which
is what seems to trigger the duplicate ACKs that
cause us trouble.
This commit is contained in:
Ori Bernstein 2022-04-16 23:52:10 +00:00
parent d606d83ed8
commit 261d1ac0e3
2 changed files with 34 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
sys/src/cmd/git/fetch.c
View file

@ -180,12 +180,13 @@ fail(char *pack, char *idx, char *msg, ...)
int
fetchpack(Conn *c)
{
char buf[Pktmax], *sp[3];
char buf[Pktmax], *sp[3], *ep;
char *packtmp, *idxtmp, **ref;
Hash h, *have, *want;
int nref, refsz, first;
int i, n, req, pfd;
int i, n, l, req, pfd;
vlong packsz;
Objset hadobj;
Object *o;
nref = 0;
@ -246,13 +247,19 @@ fetchpack(Conn *c)
req = 1;
}
flushpkt(c);
osinit(&hadobj);
for(i = 0; i < nref; i++){
if(hasheq(&have[i], &Zhash))
if(hasheq(&have[i], &Zhash) || oshas(&hadobj, have[i]))
continue;
if((o = readobject(have[i])) == nil)
sysfatal("missing object we should have: %H", have[i]);
osadd(&hadobj, o);
unref(o);
n = snprint(buf, sizeof(buf), "have %H\n", have[i]);
if(writepkt(c, buf, n + 1) == -1)
sysfatal("could not send have for %H", have[i]);
}
osclear(&hadobj);
if(!req)
flushpkt(c);
@ -260,7 +267,7 @@ fetchpack(Conn *c)
if(writepkt(c, buf, n) == -1)
sysfatal("write: %r");
if(!req)
return 0;
goto showrefs;
if(readphase(c) == -1)
sysfatal("read: %r");
if((n = readpkt(c, buf, sizeof(buf))) == -1)
@ -277,7 +284,28 @@ fetchpack(Conn *c)
sysfatal("could not create %s: %r", packtmp);
fprint(2, "fetching...\n");
packsz = 0;
/*
* Work around torvalds git bug: we get duplicate have lines
* somtimes, even though the protocol is supposed to start the
* pack file immediately.
*
* Skip ahead until we read 'PACK' off the wire
*/
while(1){
if(readn(c->rfd, buf, 4) != 4)
sysfatal("fetch packfile: short read");
buf[4] = 0;
if(strncmp(buf, "PACK", 4) == 0)
break;
l = strtol(buf, &ep, 16);
if(l == 0 || ep != buf + 4)
sysfatal("fetch packfile: junk pktline");
if(readn(c->rfd, buf, l) != l)
sysfatal("fetch packfile: short read");
}
if(write(pfd, "PACK", 4) != 4)
sysfatal("write pack header: %r");
packsz = 4;
while(1){
n = read(c->rfd, buf, sizeof buf);
if(n == 0)

5
sys/src/cmd/git/pull
View file

@ -7,13 +7,10 @@ fn update{
upstream=$2
url=$3
dir=$4
bflag=()
dflag=()
if(! ~ $#branch 0)
bflag=(-b $branch)
if(! ~ $#debug 0)
dflag='-d'
{git/fetch $dflag $bflag -u $upstream $url >[2=3] || die $status} | awk '
{git/fetch $dflag -u $upstream $url >[2=3] || die $status} | awk '
/^remote/{
if($2=="HEAD")
next