ref: ec28e68d5f5d72748d4b2d0be2861956b856ef4f
dir: git9/save.c
#include <u.h>
#include <libc.h>
#include "git.h"
typedef struct Objbuf Objbuf;
struct Objbuf {
int off;
char *hdr;
int nhdr;
char *dat;
int ndat;
};
enum {
Maxparents = 16,
};
static int
bwrite(void *p, void *buf, int nbuf)
{
return Bwrite(p, buf, nbuf);
}
static int
objbytes(void *p, void *buf, int nbuf)
{
Objbuf *b;
int r, n, o;
char *s;
b = p;
n = 0;
if(b->off < b->nhdr){
r = b->nhdr - b->off;
r = (nbuf < r) ? nbuf : r;
memcpy(buf, b->hdr, r);
b->off += r;
nbuf -= r;
n += r;
}
if(b->off < b->ndat + b->nhdr){
s = buf;
o = b->off - b->nhdr;
r = b->ndat - o;
r = (nbuf < r) ? nbuf : r;
memcpy(s + n, b->dat + o, r);
b->off += r;
n += r;
}
return n;
}
void
writeobj(Hash *h, char *hdr, int nhdr, char *dat, int ndat)
{
Objbuf b = {.off=0, .hdr=hdr, .nhdr=nhdr, .dat=dat, .ndat=ndat};
char s[64], o[256];
SHA1state *st;
Biobuf *f;
int fd;
st = sha1((uchar*)hdr, nhdr, nil, nil);
st = sha1((uchar*)dat, ndat, nil, st);
sha1(nil, 0, h->h, st);
snprint(s, sizeof(s), "%H", *h);
fd = create(".git/objects", OREAD, DMDIR|0755);
close(fd);
snprint(o, sizeof(o), ".git/objects/%c%c", s[0], s[1]);
fd = create(o, OREAD, DMDIR | 0755);
close(fd);
snprint(o, sizeof(o), ".git/objects/%c%c/%s", s[0], s[1], s + 2);
if(readobject(*h) == nil){
if((f = Bopen(o, OWRITE)) == nil)
sysfatal("could not open %s: %r", o);
if(deflatezlib(f, bwrite, &b, objbytes, 9, 0) == -1)
sysfatal("could not write %s: %r", o);
Bterm(f);
}
}
int
gitmode(int m)
{
return (m & 0777) | ((m & DMDIR) ? 0040000 : 0100000);
}
void
blobify(char *path, vlong size, Hash *bh)
{
char h[64], *d;
int f, nh;
nh = snprint(h, sizeof(h), "%T %lld", GBlob, size) + 1;
if((f = open(path, OREAD)) == -1)
sysfatal("could not open %s: %r", path);
d = emalloc(size);
if(readn(f, d, size) != size)
sysfatal("could not read blob %s: %r", path);
writeobj(bh, h, nh, d, size);
close(f);
free(d);
}
int
tracked(char *path)
{
Dir *d;
char ipath[256];
/* Explicitly removed. */
snprint(ipath, sizeof(ipath), ".git/index9/removed/%s", path);
if(strstr(cleanname(ipath), ".git/index9/removed") != ipath)
sysfatal("path %s leaves index", ipath);
d = dirstat(ipath);
if(d != nil && d->qid.type != QTDIR){
free(d);
return 0;
}
/* Explicitly added. */
snprint(ipath, sizeof(ipath), ".git/index9/tracked/%s", path);
if(strstr(cleanname(ipath), ".git/index9/tracked") != ipath)
sysfatal("path %s leaves index", ipath);
if(access(ipath, AEXIST) == 0)
return 1;
return 0;
}
int
dircmp(void *pa, void *pb)
{
char aname[256], bname[256], c;
Dir *a, *b;
a = pa;
b = pb;
/*
* If the files have the same name, they're equal.
* Otherwise, If they're trees, they sort as thoug
* there was a trailing slash.
*
* Wat.
*/
if(strcmp(a->name, b->name) == 0){
snprint(aname, sizeof(aname), "%s", a->name);
snprint(bname, sizeof(bname), "%s", b->name);
}else{
c = (a->qid.type & QTDIR) ? '/' : 0;
snprint(aname, sizeof(aname), "%s%c", a->name, c);
c = (b->qid.type & QTDIR) ? '/' : 0;
snprint(bname, sizeof(bname), "%s%c", b->name, c);
}
return strcmp(aname, bname);
}
int
treeify(char *path, Hash *th)
{
char *t, h[64], l[256], ep[256];
int nd, nl, nt, nh, i, s;
Hash eh;
Dir *d;
if((nd = slurpdir(path, &d)) == -1)
sysfatal("could not read %s", path);
if(nd == 0)
return 0;
t = nil;
nt = 0;
qsort(d, nd, sizeof(Dir), dircmp);
for(i = 0; i < nd; i++){
snprint(ep, sizeof(ep), "%s/%s", path, d[i].name);
if(strcmp(d[i].name, ".git") == 0)
continue;
if(!tracked(ep))
continue;
if((d[i].qid.type & QTDIR) == 0)
blobify(ep, d[i].length, &eh);
else if(treeify(ep, &eh) == 0)
continue;
nl = snprint(l, sizeof(l), "%o %s", gitmode(d[i].mode), d[i].name);
s = nt + nl + sizeof(eh.h) + 1;
t = realloc(t, s);
memcpy(t + nt, l, nl + 1);
memcpy(t + nt + nl + 1, eh.h, sizeof(eh.h));
nt = s;
}
free(d);
nh = snprint(h, sizeof(h), "%T %d", GTree, nt) + 1;
if(nh >= sizeof(h))
sysfatal("overlong header");
writeobj(th, h, nh, t, nt);
free(t);
return nd;
}
void
mkcommit(Hash *c, char *msg, char *name, char *email, Hash *parents, int nparents, Hash tree)
{
char *s, h[64];
int ns, nh, i;
Fmt f;
fmtstrinit(&f);
fmtprint(&f, "tree %H\n", tree);
for(i = 0; i < nparents; i++)
fmtprint(&f, "parent %H\n", parents[i]);
fmtprint(&f, "author %s <%s> %lld +0000\n", name, email, (vlong)time(nil));
fmtprint(&f, "committer %s <%s> %lld +0000\n", name, email, (vlong)time(nil));
fmtprint(&f, "\n");
fmtprint(&f, "%s", msg);
s = fmtstrflush(&f);
ns = strlen(s);
nh = snprint(h, sizeof(h), "%T %d", GCommit, ns) + 1;
writeobj(c, h, nh, s, ns);
free(s);
}
void
usage(void)
{
fprint(2, "usage: git/commit -n name -e email -m message -d dir");
exits("usage");
}
void
main(int argc, char **argv)
{
Hash c, t, parents[Maxparents];
char *msg, *name, *email;
int r, nparents;
msg = nil;
name = nil;
email = nil;
nparents = 0;
gitinit();
ARGBEGIN{
case 'm': msg = EARGF(usage()); break;
case 'n': name = EARGF(usage()); break;
case 'e': email = EARGF(usage()); break;
case 'p':
if(nparents >= Maxparents)
sysfatal("too many parents");
if(resolveref(&parents[nparents++], EARGF(usage())) == -1)
sysfatal("invalid parent: %r");
break;
}ARGEND;
if(!msg) sysfatal("missing message");
if(!name) sysfatal("missing name");
if(!email) sysfatal("missing email");
if(!msg || !name)
usage();
gitinit();
if(access(".git", AEXIST) != 0)
sysfatal("could not find git repo: %r");
r = treeify(".", &t);
if(r == -1)
sysfatal("could not commit: %r\n");
if(r == 0)
sysfatal("empty commit: aborting");
mkcommit(&c, msg, name, email, parents, nparents, t);
print("%H\n", c);
exits(nil);
}