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/* hg debug stuff, will become update/merge program */
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "dat.h"
#include "fns.h"
typedef struct Workdir Workdir;
typedef struct Dstate Dstate;
struct Dstate
{
Dstate *next;
int mode;
ulong size;
long mtime;
char status;
char path[];
};
struct Workdir
{
char path[MAXPATH];
uchar p1hash[HASHSZ];
uchar p2hash[HASHSZ];
Dstate *ht[256];
};
static Dstate**
dslookup(Workdir *wd, char *path)
{
Dstate **hp, *h;
hp = &wd->ht[hashstr(path) % nelem(wd->ht)];
for(h = *hp; h != nil; h = *hp){
if(strcmp(path, h->path) == 0)
break;
hp = &h->next;
}
return hp;
}
static void
clearworkdir(Workdir *wd)
{
Dstate *h;
int i;
for(i=0; i<nelem(wd->ht); i++)
while(h = wd->ht[i]){
wd->ht[i] = h->next;
free(h);
}
memset(wd, 0, sizeof(*wd));
}
static int
loadworkdir(Workdir *wd, char *path)
{
uchar hdr[1+4+4+4+4];
char buf[MAXPATH], *err;
Dstate **hp, *h;
int fd, n;
memset(wd, 0, sizeof(*wd));
if(getworkdir(wd->path, path) < 0)
return -1;
snprint(buf, sizeof(buf), "%s/.hg/dirstate", wd->path);
if((fd = open(buf, OREAD)) < 0)
return -1;
err = "dirstate truncated";
if(read(fd, wd->p1hash, HASHSZ) != HASHSZ)
goto Error;
if(read(fd, wd->p2hash, HASHSZ) != HASHSZ)
goto Error;
for(;;){
if((n = read(fd, hdr, sizeof(hdr))) == 0)
break;
if(n < 0){
err = "reading dirstate: %r";
goto Error;
}
if(n != sizeof(hdr))
goto Error;
n = hdr[16] | hdr[15]<<8 | hdr[14]<<16 | hdr[13]<<24;
if(n < 0 || n >= sizeof(buf)){
err = "bad path length in dirstate";
goto Error;
}
if(read(fd, buf, n) != n)
goto Error;
buf[n++] = 0;
hp = dslookup(wd, buf);
if(*hp != nil){
err = "duplicate entry in dirstate";
goto Error;
}
h = malloc(sizeof(*h) + n);
if(h == nil){
err = "out of memory";
goto Error;
}
memmove(h->path, buf, n);
h->status = hdr[0];
h->mode = hdr[4] | hdr[3]<<8 | hdr[2]<<16 | hdr[1]<<24;
h->size = hdr[8] | hdr[7]<<8 | hdr[6]<<16 | hdr[5]<<24;
h->mtime = hdr[12] | hdr[11]<<8 | hdr[10]<<16 | hdr[9]<<24;
h->next = *hp;
*hp = h;
}
close(fd);
return 0;
Error:
clearworkdir(wd);
close(fd);
werrstr(err);
return -1;
}
void
changes(char *lpath, char *rpath, char *apath)
{
print("local=%s\nremote=%s\nancestor=%s\n", lpath, rpath, apath);
}
void
usage(void)
{
fprint(2, "usage: %s [-m mtpt] [-r rev] [root]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
char lpath[MAXPATH], rpath[MAXPATH], apath[MAXPATH];
uchar rhash[HASHSZ], ahash[HASHSZ];
char *mtpt, *rev;
Workdir wd;
fmtinstall('H', Hfmt);
rev = "tip";
mtpt = "/mnt/hg";
ARGBEGIN {
case 'm':
mtpt = EARGF(usage());
break;
case 'r':
rev = EARGF(usage());
break;
} ARGEND;
memset(&wd, 0, sizeof(wd));
if(loadworkdir(&wd, *argv) < 0)
sysfatal("loadworkdir: %r");
if(memcmp(wd.p2hash, nullid, HASHSZ))
sysfatal("outstanding merge");
snprint(rpath, sizeof(rpath), "%s/%s", mtpt, rev);
if(readhash(rpath, "rev", rhash) != 0)
sysfatal("unable to get hash for %s", rev);
if(memcmp(rhash, wd.p1hash, HASHSZ) == 0){
fprint(2, "up to date\n");
exits(0);
}
ancestor(mtpt, wd.p1hash, rhash, ahash);
if(memcmp(ahash, nullid, HASHSZ) == 0)
sysfatal("no common ancestor between %H and %H", wd.p1hash, rhash);
if(memcmp(ahash, rhash, HASHSZ) == 0)
memmove(ahash, wd.p1hash, HASHSZ);
snprint(lpath, sizeof(lpath), "%s/%H/files", mtpt, wd.p1hash);
snprint(rpath, sizeof(rpath), "%s/%H/files", mtpt, rhash);
snprint(apath, sizeof(apath), "%s/%H/files", mtpt, ahash);
changes(lpath, rpath, apath);
exits(0);
}
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