ref: 7359de438cfaac829c4ed8b39fae9bb872fb5eea
dir: /sys/src/cmd/git/send.c/
#include <u.h>
#include <libc.h>
#include "git.h"
typedef struct Capset Capset;
typedef struct Map Map;
struct Capset {
int sideband;
int sideband64k;
int report;
};
struct Map {
char *ref;
Hash ours;
Hash theirs;
};
int sendall;
int force;
int nbranch;
char **branch;
char *removed[128];
int nremoved;
int npacked;
int nsent;
int
findref(char **r, int nr, char *ref)
{
int i;
for(i = 0; i < nr; i++)
if(strcmp(r[i], ref) == 0)
return i;
return -1;
}
int
findkey(Map *m, int nm, char *ref)
{
int i;
for(i = 0; i < nm; i++)
if(strcmp(m[i].ref, ref) == 0)
return i;
return -1;
}
int
readours(Hash **tailp, char ***refp)
{
int nu, i, idx;
char *r, *pfx, **ref;
Hash *tail;
if(sendall)
return listrefs(tailp, refp);
nu = 0;
tail = eamalloc((nremoved + nbranch), sizeof(Hash));
ref = eamalloc((nremoved + nbranch), sizeof(char*));
for(i = 0; i < nbranch; i++){
ref[nu] = estrdup(branch[i]);
if(resolveref(&tail[nu], branch[i]) == -1)
sysfatal("broken branch %s", branch[i]);
nu++;
}
for(i = 0; i < nremoved; i++){
pfx = "refs/heads/";
if(strstr(removed[i], "heads/") == removed[i])
pfx = "refs/";
if(strstr(removed[i], "refs/heads/") == removed[i])
pfx = "";
if((r = smprint("%s%s", pfx, removed[i])) == nil)
sysfatal("smprint: %r");
if((idx = findref(ref, nu, r)) == -1)
idx = nu++;
else
free(ref[idx]);
assert(idx < nremoved + nbranch);
memcpy(&tail[idx], &Zhash, sizeof(Hash));
ref[idx] = r;
}
dprint(1, "nu: %d\n", nu);
for(i = 0; i < nu; i++)
dprint(1, "update: %H %s\n", tail[i], ref[i]);
*tailp = tail;
*refp = ref;
return nu;
}
char *
matchcap(char *s, char *cap, int full)
{
if(strncmp(s, cap, strlen(cap)) == 0)
if(!full || strlen(s) == strlen(cap))
return s + strlen(cap);
return nil;
}
void
parsecaps(char *caps, Capset *cs)
{
char *p, *n;
for(p = caps; p != nil; p = n){
n = strchr(p, ' ');
if(n != nil)
*n++ = 0;
if(matchcap(p, "report-status", 1) != nil)
cs->report = 1;
if(matchcap(p, "side-band", 1) != nil)
cs->sideband = 1;
if(matchcap(p, "side-band-64k", 1) != nil)
cs->sideband64k = 1;
}
}
int
sendpack(Conn *c)
{
int i, n, idx, nsp, send, first;
int nours, ntheirs, nmap;
char buf[Pktmax], *sp[3];
Hash h, *theirs, *ours;
Object *a, *b, *p, *o;
char **refs;
Capset cs;
Map *map, *m;
first = 1;
memset(&cs, 0, sizeof(Capset));
nours = readours(&ours, &refs);
theirs = nil;
ntheirs = 0;
nmap = nours;
map = eamalloc(nmap, sizeof(Map));
for(i = 0; i < nmap; i++){
map[i].theirs = Zhash;
map[i].ours = ours[i];
map[i].ref = refs[i];
}
while(1){
n = readpkt(c, buf, sizeof(buf));
if(n == -1)
return -1;
if(n == 0)
break;
if(first && n > strlen(buf))
parsecaps(buf + strlen(buf) + 1, &cs);
first = 0;
if(strncmp(buf, "ERR ", 4) == 0)
sysfatal("%s", buf + 4);
if(getfields(buf, sp, nelem(sp), 1, " \t\r\n") != 2)
sysfatal("invalid ref line %.*s", utfnlen(buf, n), buf);
theirs = earealloc(theirs, ntheirs+1, sizeof(Hash));
if(hparse(&theirs[ntheirs], sp[0]) == -1)
sysfatal("invalid hash %s", sp[0]);
if((idx = findkey(map, nmap, sp[1])) != -1)
map[idx].theirs = theirs[ntheirs];
/*
* we only keep their ref if we can read the object to add it
* to our reachability; otherwise, discard it; we only care
* that we don't have it, so we can tell whether we need to
* bail out of pushing.
*/
if((o = readobject(theirs[ntheirs])) != nil){
ntheirs++;
unref(o);
}
}
if(writephase(c) == -1)
return -1;
send = 0;
if(force)
send=1;
for(i = 0; i < nmap; i++){
m = &map[i];
a = readobject(m->theirs);
if(hasheq(&m->ours, &Zhash))
b = nil;
else
b = readobject(m->ours);
p = nil;
if(a != nil && b != nil)
p = ancestor(a, b);
if(!force
&& !hasheq(&m->theirs, &Zhash)
&& !hasheq(&m->ours, &Zhash)
&& (a == nil || p != a)){
fprint(2, "remote has diverged\n");
werrstr("remote diverged");
flushpkt(c);
return -1;
}
unref(a);
unref(b);
unref(p);
if(hasheq(&m->theirs, &m->ours)){
print("uptodate %s\n", m->ref);
continue;
}
print("update %s %H %H\n", m->ref, m->theirs, m->ours);
n = snprint(buf, sizeof(buf), "%H %H %s", m->theirs, m->ours, m->ref);
/*
* Workaround for github.
*
* Github will accept the pack but fail to update the references
* if we don't have capabilities advertised. Report-status seems
* harmless to add, so we add it.
*
* Github doesn't advertise any capabilities, so we can't check
* for compatibility. We just need to add it blindly.
*/
if(i == 0 && cs.report){
buf[n++] = '\0';
n += snprint(buf + n, sizeof(buf) - n, " report-status");
}
if(writepkt(c, buf, n) == -1)
sysfatal("unable to send update pkt");
send = 1;
}
flushpkt(c);
if(!send){
fprint(2, "nothing to send\n");
return 0;
}
if(writepack(c->wfd, ours, nours, theirs, ntheirs, &h) == -1)
return -1;
if(!cs.report)
return 0;
if(readphase(c) == -1)
return -1;
/* We asked for a status report, may as well use it. */
while((n = readpkt(c, buf, sizeof(buf))) > 0){
buf[n] = 0;
if(chattygit)
fprint(2, "done sending pack, status %s\n", buf);
nsp = getfields(buf, sp, nelem(sp), 1, " \t\n\r");
if(nsp < 2)
continue;
if(nsp < 3)
sp[2] = "";
/*
* Only report errors; successes will be reported by
* surrounding scripts.
*/
if(strcmp(sp[0], "unpack") == 0 && strcmp(sp[1], "ok") != 0)
fprint(2, "unpack %s\n", sp[1]);
else if(strcmp(sp[0], "ng") == 0)
fprint(2, "failed update: %s\n", sp[1]);
else
continue;
return -1;
}
return 0;
}
void
usage(void)
{
fprint(2, "usage: %s remote [reponame]\n", argv0);
exits("usage");
}
void
main(int argc, char **argv)
{
char *br;
Conn c;
ARGBEGIN{
default:
usage();
break;
case 'd':
chattygit++;
break;
case 'f':
force++;
break;
case 'r':
if(nremoved == nelem(removed))
sysfatal("too many deleted branches");
removed[nremoved++] = EARGF(usage());
break;
case 'a':
sendall++;
break;
case 'b':
br = EARGF(usage());
if(strncmp(br, "refs/heads/", strlen("refs/heads/")) == 0)
br = smprint("%s", br);
else if(strncmp(br, "heads/", strlen("heads/")) == 0)
br = smprint("refs/%s", br);
else
br = smprint("refs/heads/%s", br);
branch = erealloc(branch, (nbranch + 1)*sizeof(char*));
branch[nbranch] = br;
nbranch++;
break;
}ARGEND;
gitinit();
if(argc != 1)
usage();
if(gitconnect(&c, argv[0], "receive") == -1)
sysfatal("git connect: %s: %r", argv[0]);
if(sendpack(&c) == -1)
sysfatal("send failed: %r");
closeconn(&c);
exits(nil);
}