ref: e23bb0103b46e73f9ce8d69abb19a3726135fff3
dir: /sys/src/cmd/hgfs/hgdb.c/
/* hg debug stuff, will become update/merge program */
#include <u.h>
#include <libc.h>
#include <thread.h>
#include <bio.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];
};
int clean = 0;
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;
}
char*
pjoin(char *path, char *name)
{
if(path[0] == '\0')
path = "/";
if(name[0] == '\0')
return strdup(path);
if(path[strlen(path)-1] == '/' || name[0] == '/')
return smprint("%s%s", path, name);
return smprint("%s/%s", path, name);
}
void
changes1(int fd, char *lpath, char *rpath, char *apath,
void (*apply)(char *, char *, char *, char *, char *, void *), void *aux)
{
char *state, *name;
Biobuf bin;
Binit(&bin, fd, OREAD);
while((state = Brdstr(&bin, '\n', 1)) != nil){
if((name = strchr(state, '\t')) == nil)
continue;
while(*name == '\t' || *name == ' ')
*name++ = '\0';
if(name[0] == '.' && name[1] == '/')
name += 2;
apply(state, name, lpath, rpath, apath, aux);
}
Bterm(&bin);
}
int
changes(char *opt, char *lp, char *rp, char *ap,
void (*apply)(char *, char *, char *, char *, char *, void *), void *aux)
{
int pfd[2], pid;
Waitmsg *w;
if(pipe(pfd) < 0)
return -1;
pid = rfork(RFPROC|RFMEM|RFFDG);
switch(pid){
case -1:
close(pfd[0]);
close(pfd[1]);
return -1;
case 0:
close(pfd[0]);
dup(pfd[1], 1);
close(pfd[1]);
execl("/bin/derp", "derp", opt, "-p", "0111", lp, ap, rp, nil);
exits("exec");
}
close(pfd[1]);
changes1(pfd[0], lp, rp, ap, apply, aux);
close(pfd[0]);
while(w = wait()){
if(w->pid == pid){
if(w->msg[0] != '\0'){
werrstr("%s", w->msg);
free(w);
return 1;
}
free(w);
return 0;
}
free(w);
}
return -1;
}
void
apply(char *state, char *name, char *lp, char *rp, char *ap, Workdir *)
{
Dir *rd, *ld;
ld = rd = nil;
// fprint(2, "### %s %s ->\t", state, name);
if(strcmp(state, "na") == 0){
rd = dirstat(rp);
if(rd != nil){
if(rd->qid.type & QTDIR)
print("mkdir %s\n", lp);
else
print("cp %s %s\n", rp, lp);
}
}
else if(strcmp(state, "an") == 0){
}
else if(strcmp(state, "nm") == 0){
print("cp %s %s\n", rp, lp);
}
else if(strcmp(state, "mn") == 0){
}
else if(strcmp(state, "nd") == 0){
print("rm %s\n", lp);
}
else if(strcmp(state, "dn") == 0){
}
else if(strcmp(state, "aa!") == 0 || strcmp(state, "mm!") == 0){
ld = dirstat(lp);
rd = dirstat(rp);
if(ld != nil && rd != nil){
if(rd->qid.type & QTDIR)
print("# conflict # mkdir %s\n", lp);
else if(ld->qid.type & QTDIR)
print("# conflict # rm -r %s\n", lp);
else
print("# conflict # ape/diff3 %s %s %s >%s\n", lp, ap, rp, lp);
}
}
else if(strcmp(state, "md!") == 0){
print("# delete conflict # rm %s\n", lp);
}
else if(strcmp(state, "dm!") == 0){
print("# delete conflict # cp %s %s\n", rp, lp);
}
else {
print("# unknown status %s %s\n", state, name);
}
free(rd);
free(ld);
}
void
apply1(char *state, char *name, char *lp, char *rp, char *ap, void *aux)
{
Workdir *wd = aux;
lp = pjoin(lp, name);
rp = pjoin(rp, name);
ap = pjoin(ap, name);
apply(state, lp + strlen(wd->path)+1, lp, rp, ap, wd);
free(ap);
free(rp);
free(lp);
}
void
apply0(char *state, char *name, char *lp, char *rp, char *ap, void *aux)
{
Workdir *wd = aux;
Dir *ld;
if(clean){
/* working dir clean */
apply1(state, name, wd->path, rp, ap, wd);
return;
}
lp = pjoin(wd->path, name);
ld = dirstat(lp);
if(clean == 0 && ld != nil && (ld->qid.type & QTDIR) == 0){
/* check for changes in working directory */
rp = pjoin(rp, name);
ap = pjoin(ap, name);
changes("-Lcq", lp, rp, ap, apply1, wd);
free(ap);
free(rp);
} else {
/* working dir clean */
apply1(state, name, wd->path, rp, ap, wd);
}
free(lp);
free(ld);
}
void
usage(void)
{
fprint(2, "usage: %s [-m mtpt] [-r rev] [root]\n", argv0);
exits("usage");
}
void
main(int argc, char *argv[])
{
char lp[MAXPATH], rp[MAXPATH], ap[MAXPATH];
uchar rh[HASHSZ], ah[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;
case 'c':
clean = 1;
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(rp, sizeof(rp), "%s/%s", mtpt, rev);
if(readhash(rp, "rev", rh) != 0)
sysfatal("unable to get hash for %s", rev);
if(memcmp(rh, wd.p1hash, HASHSZ) == 0){
fprint(2, "up to date\n");
exits(0);
}
ancestor(mtpt, wd.p1hash, rh, ah);
if(memcmp(ah, nullid, HASHSZ) == 0)
sysfatal("no common ancestor between %H and %H", wd.p1hash, rh);
if(memcmp(ah, rh, HASHSZ) == 0)
memmove(ah, wd.p1hash, HASHSZ);
snprint(lp, sizeof(lp), "%s/%H/files", mtpt, wd.p1hash);
snprint(rp, sizeof(rp), "%s/%H/files", mtpt, rh);
snprint(ap, sizeof(ap), "%s/%H/files", mtpt, ah);
changes("-L", lp, rp, ap, apply0, &wd);
exits(0);
}