ref: c3ba64f6935322f09b6de5c2285544fd471c605d
dir: /sys/src/cmd/vac/vac.c/
#include "stdinc.h"
#include "vac.h"
#include "dat.h"
#include "fns.h"
// TODO: qids
void
usage(void)
{
fprint(2, "vac [-imqstv] [-a archive.vac] [-b bsize] [-d old.vac] [-e exclude] [-f new.vac] [-i name] [-h host] [-x excludefile] file...\n");
threadexitsall("usage");
}
enum
{
BlockSize = 8*1024,
};
struct
{
int nfile;
int ndir;
vlong data;
vlong skipdata;
int skipfiles;
} stats;
int qdiff;
int merge;
int verbose;
int notmp;
char *host;
VtConn *z;
VacFs *fs;
char *archivefile;
char *vacfile;
int vacmerge(VacFile*, char*);
void vac(VacFile*, VacFile*, char*, Dir*);
void vacstdin(VacFile*, char*);
VacFile *recentarchive(VacFs*, char*);
static u64int unittoull(char*);
static void warn(char *fmt, ...);
static void removevacfile(void);
void
threadmain(int argc, char **argv)
{
int i, j, fd, n, printstats;
Dir *d;
char *s;
uvlong u;
VacFile *f, *fdiff;
VacFs *fsdiff;
int blocksize;
int outfd;
char *stdinname;
char *diffvac;
uvlong qid;
fmtinstall('F', vtfcallfmt);
fmtinstall('H', encodefmt);
fmtinstall('V', vtscorefmt);
blocksize = BlockSize;
stdinname = nil;
printstats = 0;
fsdiff = nil;
diffvac = nil;
ARGBEGIN{
case 'V':
chattyventi++;
break;
case 'a':
archivefile = EARGF(usage());
break;
case 'b':
u = unittoull(EARGF(usage()));
if(u < 512)
u = 512;
if(u > VtMaxLumpSize)
u = VtMaxLumpSize;
blocksize = u;
break;
case 'd':
diffvac = EARGF(usage());
break;
case 'e':
excludepattern(EARGF(usage()));
break;
case 'f':
vacfile = EARGF(usage());
break;
case 'h':
host = EARGF(usage());
break;
case 'i':
stdinname = EARGF(usage());
break;
case 'm':
merge++;
break;
case 'q':
qdiff++;
break;
case 's':
printstats++;
break;
case 't':
notmp++;
break;
case 'v':
verbose++;
break;
case 'x':
loadexcludefile(EARGF(usage()));
break;
default:
usage();
}ARGEND
if(argc == 0 && !stdinname)
usage();
if(archivefile && (vacfile || diffvac)){
fprint(2, "cannot use -a with -f, -d\n");
usage();
}
z = vtdial(host);
if(z == nil)
sysfatal("could not connect to server: %r");
if(vtconnect(z) < 0)
sysfatal("vtconnect: %r");
// Setup:
// fs is the output vac file system
// f is directory in output vac to write new files
// fdiff is corresponding directory in existing vac
if(archivefile){
VacFile *fp;
char yyyy[5];
char mmdd[10];
char oldpath[40];
Tm tm;
fdiff = nil;
if((outfd = open(archivefile, ORDWR)) < 0){
if(access(archivefile, 0) >= 0)
sysfatal("open %s: %r", archivefile);
if((outfd = create(archivefile, OWRITE, 0666)) < 0)
sysfatal("create %s: %r", archivefile);
atexit(removevacfile); // because it is new
if((fs = vacfscreate(z, blocksize, 512)) == nil)
sysfatal("vacfscreate: %r");
}else{
if((fs = vacfsopen(z, archivefile, VtORDWR, 512)) == nil)
sysfatal("vacfsopen %s: %r", archivefile);
if((fdiff = recentarchive(fs, oldpath)) != nil){
if(verbose)
fprint(2, "diff %s\n", oldpath);
}else
if(verbose)
fprint(2, "no recent archive to diff against\n");
}
// Create yyyy/mmdd.
tm = *localtime(time(0));
snprint(yyyy, sizeof yyyy, "%04d", tm.year+1900);
fp = vacfsgetroot(fs);
if((f = vacfilewalk(fp, yyyy)) == nil
&& (f = vacfilecreate(fp, yyyy, ModeDir|0555)) == nil)
sysfatal("vacfscreate %s: %r", yyyy);
vacfiledecref(fp);
fp = f;
snprint(mmdd, sizeof mmdd, "%02d%02d", tm.mon+1, tm.mday);
n = 0;
while((f = vacfilewalk(fp, mmdd)) != nil){
vacfiledecref(f);
n++;
snprint(mmdd+4, sizeof mmdd-4, ".%d", n);
}
f = vacfilecreate(fp, mmdd, ModeDir|0555);
if(f == nil)
sysfatal("vacfscreate %s/%s: %r", yyyy, mmdd);
vacfiledecref(fp);
if(verbose)
fprint(2, "archive %s/%s\n", yyyy, mmdd);
}else{
if(vacfile == nil)
outfd = 1;
else if((outfd = create(vacfile, OWRITE, 0666)) < 0)
sysfatal("create %s: %r", vacfile);
atexit(removevacfile);
if((fs = vacfscreate(z, blocksize, 512)) == nil)
sysfatal("vacfscreate: %r");
f = vacfsgetroot(fs);
fdiff = nil;
if(diffvac){
if((fsdiff = vacfsopen(z, diffvac, VtOREAD, 128)) == nil)
warn("vacfsopen %s: %r", diffvac);
else
fdiff = vacfsgetroot(fsdiff);
}
}
if(stdinname)
vacstdin(f, stdinname);
for(i=0; i<argc; i++){
// We can't use / and . and .. and ../.. as valid archive
// names, so expand to the list of files in the directory.
if(argv[i][0] == 0){
warn("empty string given as command-line argument");
continue;
}
cleanname(argv[i]);
if(strcmp(argv[i], "/") == 0
|| strcmp(argv[i], ".") == 0
|| strcmp(argv[i], "..") == 0
|| (strlen(argv[i]) > 3 && strcmp(argv[i]+strlen(argv[i])-3, "/..") == 0)){
if((fd = open(argv[i], OREAD)) < 0){
warn("open %s: %r", argv[i]);
continue;
}
while((n = dirread(fd, &d)) > 0){
for(j=0; j<n; j++){
s = vtmalloc(strlen(argv[i])+1+strlen(d[j].name)+1);
strcpy(s, argv[i]);
strcat(s, "/");
strcat(s, d[j].name);
cleanname(s);
vac(f, fdiff, s, &d[j]);
}
free(d);
}
close(fd);
continue;
}
if((d = dirstat(argv[i])) == nil){
warn("stat %s: %r", argv[i]);
continue;
}
vac(f, fdiff, argv[i], d);
free(d);
}
if(fdiff)
vacfiledecref(fdiff);
/*
* Record the maximum qid so that vacs can be merged
* without introducing overlapping qids. Older versions
* of vac arranged that the root would have the largest
* qid in the file system, but we can't do that anymore
* (the root gets created first!).
*/
if(_vacfsnextqid(fs, &qid) >= 0)
vacfilesetqidspace(f, 0, qid);
vacfiledecref(f);
/*
* Copy fsdiff's root block score into fs's slot for that,
* so that vacfssync will copy it into root.prev for us.
* Just nice documentation, no effect.
*/
if(fsdiff)
memmove(fs->score, fsdiff->score, VtScoreSize);
if(vacfssync(fs) < 0)
fprint(2, "vacfssync: %r\n");
fprint(outfd, "vac:%V\n", fs->score);
atexitdont(removevacfile);
vacfsclose(fs);
vthangup(z);
if(printstats){
fprint(2,
"%d files, %d files skipped, %d directories\n"
"%lld data bytes written, %lld data bytes skipped\n",
stats.nfile, stats.skipfiles, stats.ndir, stats.data, stats.skipdata);
dup(2, 1);
packetstats();
}
threadexitsall(0);
}
VacFile*
recentarchive(VacFs *fs, char *path)
{
VacFile *fp, *f;
VacDirEnum *de;
VacDir vd;
char buf[10];
int year, mmdd, nn, n, n1;
char *p;
fp = vacfsgetroot(fs);
de = vdeopen(fp);
year = 0;
if(de){
for(; vderead(de, &vd) > 0; vdcleanup(&vd)){
if(strlen(vd.elem) != 4)
continue;
if((n = strtol(vd.elem, &p, 10)) < 1900 || *p != 0)
continue;
if(year < n)
year = n;
}
}
vdeclose(de);
if(year == 0){
vacfiledecref(fp);
return nil;
}
snprint(buf, sizeof buf, "%04d", year);
if((f = vacfilewalk(fp, buf)) == nil){
fprint(2, "warning: dirread %s but cannot walk", buf);
vacfiledecref(fp);
return nil;
}
fp = f;
de = vdeopen(fp);
mmdd = 0;
nn = 0;
if(de){
for(; vderead(de, &vd) > 0; vdcleanup(&vd)){
if(strlen(vd.elem) < 4)
continue;
if((n = strtol(vd.elem, &p, 10)) < 100 || n > 1231 || p != vd.elem+4)
continue;
if(*p == '.'){
if(p[1] == '0' || (n1 = strtol(p+1, &p, 10)) == 0 || *p != 0)
continue;
}else{
if(*p != 0)
continue;
n1 = 0;
}
if(n < mmdd || (n == mmdd && n1 < nn))
continue;
mmdd = n;
nn = n1;
}
}
vdeclose(de);
if(mmdd == 0){
vacfiledecref(fp);
return nil;
}
if(nn == 0)
snprint(buf, sizeof buf, "%04d", mmdd);
else
snprint(buf, sizeof buf, "%04d.%d", mmdd, nn);
if((f = vacfilewalk(fp, buf)) == nil){
fprint(2, "warning: dirread %s but cannot walk", buf);
vacfiledecref(fp);
return nil;
}
vacfiledecref(fp);
sprint(path, "%04d/%s", year, buf);
return f;
}
static void
removevacfile(void)
{
if(vacfile)
remove(vacfile);
}
void
plan9tovacdir(VacDir *vd, Dir *dir)
{
memset(vd, 0, sizeof *vd);
vd->elem = dir->name;
vd->uid = dir->uid;
vd->gid = dir->gid;
vd->mid = dir->muid;
if(vd->mid == nil)
vd->mid = "";
vd->mtime = dir->mtime;
vd->mcount = 0;
vd->ctime = dir->mtime; /* ctime: not available on plan 9 */
vd->atime = dir->atime;
vd->size = dir->length;
vd->mode = dir->mode & 0777;
if(dir->mode & DMDIR)
vd->mode |= ModeDir;
if(dir->mode & DMAPPEND)
vd->mode |= ModeAppend;
if(dir->mode & DMEXCL)
vd->mode |= ModeExclusive;
vd->plan9 = 1;
vd->p9path = dir->qid.path;
vd->p9version = dir->qid.vers;
}
/*
* Archive the file named name, which has stat info d,
* into the vac directory fp (p = parent).
*
* If we're doing a vac -d against another archive, the
* equivalent directory to fp in that archive is diffp.
*/
void
vac(VacFile *fp, VacFile *diffp, char *name, Dir *d)
{
char *elem, *s;
static char buf[65536];
int fd, i, n, bsize;
vlong off;
Dir *dk; // kids
VacDir vd, vddiff;
VacFile *f, *fdiff;
VtEntry e;
if(!includefile(name) || (notmp && (d->qid.type&QTTMP))) {
warn("excluding %s%s", name, (d->mode&DMDIR) ? "/" : "");
return;
}
if(d->mode&DMDIR)
stats.ndir++;
else
stats.nfile++;
if(merge && vacmerge(fp, name) >= 0)
return;
if(verbose)
fprint(2, "%s%s\n", name, (d->mode&DMDIR) ? "/" : "");
if((fd = open(name, OREAD)) < 0){
warn("open %s: %r", name);
return;
}
elem = strrchr(name, '/');
if(elem)
elem++;
else
elem = name;
plan9tovacdir(&vd, d);
if((f = vacfilecreate(fp, elem, vd.mode)) == nil){
warn("vacfilecreate %s: %r", name);
return;
}
if(diffp)
fdiff = vacfilewalk(diffp, elem);
else
fdiff = nil;
if(vacfilesetdir(f, &vd) < 0)
warn("vacfilesetdir %s: %r", name);
if(d->mode&DMDIR){
while((n = dirread(fd, &dk)) > 0){
for(i=0; i<n; i++){
s = vtmalloc(strlen(name)+1+strlen(dk[i].name)+1);
strcpy(s, name);
strcat(s, "/");
strcat(s, dk[i].name);
vac(f, fdiff, s, &dk[i]);
free(s);
}
free(dk);
}
}else{
off = 0;
bsize = fs->bsize;
if(fdiff){
/*
* Copy fdiff's contents into f by moving the score.
* We'll diff and update below.
*/
if(vacfilegetentries(fdiff, &e, nil) >= 0)
if(vacfilesetentries(f, &e, nil) >= 0){
bsize = e.dsize;
/*
* Or if -q is set, and the metadata looks the same,
* don't even bother reading the file.
*/
if(qdiff && vacfilegetdir(fdiff, &vddiff) >= 0){
if(vddiff.mtime == vd.mtime)
if(vddiff.size == vd.size)
if(!vddiff.plan9 || (/* vddiff.p9path == vd.p9path && */ vddiff.p9version == vd.p9version)){
stats.skipfiles++;
stats.nfile--;
vdcleanup(&vddiff);
goto Out;
}
/*
* Skip over presumably-unchanged prefix
* of an append-only file.
*/
if(vd.mode&ModeAppend)
if(vddiff.size < vd.size)
if(vddiff.plan9 && vd.plan9)
if(vddiff.p9path == vd.p9path){
off = vd.size/bsize*bsize;
if(seek(fd, off, 0) >= 0)
stats.skipdata += off;
else{
seek(fd, 0, 0); // paranoia
off = 0;
}
}
vdcleanup(&vddiff);
// XXX different verbose chatty prints for kaminsky?
}
}
}
if(qdiff && verbose)
fprint(2, "+%s\n", name);
while((n = readn(fd, buf, bsize)) > 0){
if(fdiff && sha1matches(f, off/bsize, (uchar*)buf, n)){
off += n;
stats.skipdata += n;
continue;
}
if(vacfilewrite(f, buf, n, off) < 0){
warn("venti write %s: %r", name);
goto Out;
}
stats.data += n;
off += n;
}
/*
* Since we started with fdiff's contents,
* set the size in case fdiff was bigger.
*/
if(fdiff && vacfilesetsize(f, off) < 0)
warn("vtfilesetsize %s: %r", name);
}
Out:
vacfileflush(f, 1);
vacfiledecref(f);
if(fdiff)
vacfiledecref(fdiff);
close(fd);
}
void
vacstdin(VacFile *fp, char *name)
{
vlong off;
VacFile *f;
static char buf[8192];
int n;
if((f = vacfilecreate(fp, name, 0666)) == nil){
warn("vacfilecreate %s: %r", name);
return;
}
off = 0;
while((n = read(0, buf, sizeof buf)) > 0){
if(vacfilewrite(f, buf, n, off) < 0){
warn("venti write %s: %r", name);
vacfiledecref(f);
return;
}
off += n;
}
vacfileflush(f, 1);
vacfiledecref(f);
}
/*
* fp is the directory we're writing.
* mp is the directory whose contents we're merging in.
* d is the directory entry of the file from mp that we want to add to fp.
* vacfile is the name of the .vac file, for error messages.
* offset is the qid that qid==0 in mp should correspond to.
* max is the maximum qid we expect to see (not really needed).
*/
int
vacmergefile(VacFile *fp, VacFile *mp, VacDir *d, char *vacfile,
vlong offset, vlong max)
{
VtEntry ed, em;
VacFile *mf;
VacFile *f;
mf = vacfilewalk(mp, d->elem);
if(mf == nil){
warn("could not walk %s in %s", d->elem, vacfile);
return -1;
}
if(vacfilegetentries(mf, &ed, &em) < 0){
warn("could not get entries for %s in %s", d->elem, vacfile);
vacfiledecref(mf);
return -1;
}
if((f = vacfilecreate(fp, d->elem, d->mode)) == nil){
warn("vacfilecreate %s: %r", d->elem);
vacfiledecref(mf);
return -1;
}
if(d->qidspace){
d->qidoffset += offset;
d->qidmax += offset;
}else{
d->qidspace = 1;
d->qidoffset = offset;
d->qidmax = max;
}
if(vacfilesetdir(f, d) < 0
|| vacfilesetentries(f, &ed, &em) < 0
|| vacfilesetqidspace(f, d->qidoffset, d->qidmax) < 0){
warn("vacmergefile %s: %r", d->elem);
vacfiledecref(mf);
vacfiledecref(f);
return -1;
}
vacfiledecref(mf);
vacfiledecref(f);
return 0;
}
int
vacmerge(VacFile *fp, char *name)
{
VacFs *mfs;
VacDir vd;
VacDirEnum *de;
VacFile *mp;
uvlong maxqid, offset;
if(strlen(name) < 4 || strcmp(name+strlen(name)-4, ".vac") != 0)
return -1;
if((mfs = vacfsopen(z, name, VtOREAD, 100)) == nil)
return -1;
if(verbose)
fprint(2, "merging %s\n", name);
mp = vacfsgetroot(mfs);
de = vdeopen(mp);
if(de){
offset = 0;
if(vacfsgetmaxqid(mfs, &maxqid) >= 0){
_vacfsnextqid(fs, &offset);
vacfsjumpqid(fs, maxqid+1);
}
while(vderead(de, &vd) > 0){
if(vd.qid > maxqid){
warn("vacmerge %s: maxqid=%lld but %s has %lld",
name, maxqid, vd.elem, vd.qid);
vacfsjumpqid(fs, vd.qid - maxqid);
maxqid = vd.qid;
}
vacmergefile(fp, mp, &vd, name,
offset, maxqid);
vdcleanup(&vd);
}
vdeclose(de);
}
vacfiledecref(mp);
vacfsclose(mfs);
return 0;
}
#define TWID64 ((u64int)~(u64int)0)
static u64int
unittoull(char *s)
{
char *es;
u64int n;
if(s == nil)
return TWID64;
n = strtoul(s, &es, 0);
if(*es == 'k' || *es == 'K'){
n *= 1024;
es++;
}else if(*es == 'm' || *es == 'M'){
n *= 1024*1024;
es++;
}else if(*es == 'g' || *es == 'G'){
n *= 1024*1024*1024;
es++;
}
if(*es != '\0')
return TWID64;
return n;
}
static void
warn(char *fmt, ...)
{
va_list arg;
va_start(arg, fmt);
fprint(2, "vac: ");
vfprint(2, fmt, arg);
fprint(2, "\n");
va_end(arg);
}