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implement Mergelog;
#
# combine old and new log sections into one with the most recent data
#
include "sys.m";
sys: Sys;
include "draw.m";
include "bufio.m";
bufio: Bufio;
Iobuf: import bufio;
include "string.m";
str: String;
include "keyring.m";
kr: Keyring;
include "daytime.m";
daytime: Daytime;
include "logs.m";
logs: Logs;
Db, Entry, Byname, Byseq: import logs;
S: import logs;
include "arg.m";
Mergelog: module
{
init: fn(nil: ref Draw->Context, nil: list of string);
};
Apply, Applydb, Install, Asis, Skip: con iota;
client: ref Db; # client current state from client log
updates: ref Db; # state delta from new section of server log
nerror := 0;
nconflict := 0;
debug := 0;
verbose := 0;
resolve := 0;
setuid := 0;
setgid := 0;
nflag := 0;
timefile: string;
clientroot: string;
srvroot: string;
logfd: ref Sys->FD;
now := 0;
gen := 0;
noerr := 0;
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
bufio = load Bufio Bufio->PATH;
ensure(bufio, Bufio->PATH);
str = load String String->PATH;
ensure(str, String->PATH);
kr = load Keyring Keyring->PATH;
ensure(kr, Keyring->PATH);
daytime = load Daytime Daytime->PATH;
ensure(daytime, Daytime->PATH);
logs = load Logs Logs->PATH;
ensure(logs, Logs->PATH);
logs->init(bufio);
arg := load Arg Arg->PATH;
ensure(arg, Arg->PATH);
arg->init(args);
arg->setusage("mergelog [-vd] oldlog [path ... ] <newlog");
dump := 0;
while((o := arg->opt()) != 0)
case o {
'd' => dump = 1; debug = 1;
'v' => verbose = 1;
* => arg->usage();
}
args = arg->argv();
if(len args < 3)
arg->usage();
arg = nil;
now = daytime->now();
client = Db.new("existing log");
updates = Db.new("update log");
clientlog := hd args; args = tl args;
if(args != nil)
error("restriction by path not yet done");
# replay the client log to build last installation state of files taken from server
logfd = sys->open(clientlog, Sys->OREAD);
if(logfd == nil)
error(sys->sprint("can't open %s: %r", clientlog));
f := bufio->fopen(logfd, Sys->OREAD);
if(f == nil)
error(sys->sprint("can't open %s: %r", clientlog));
while((log := readlog(f)) != nil)
replaylog(client, log);
f = nil;
# read new log entries and use the new section to build a sequence of update actions
f = bufio->fopen(sys->fildes(0), Sys->OREAD);
while((log = readlog(f)) != nil)
replaylog(client, log);
client.sort(Byseq);
dumpdb(client);
if(nerror)
raise sys->sprint("fail:%d errors", nerror);
}
readlog(in: ref Iobuf): ref Entry
{
(e, err) := Entry.read(in);
if(err != nil)
error(err);
return e;
}
#
# replay a log to reach the state wrt files previously taken from the server
#
replaylog(db: ref Db, log: ref Entry)
{
e := db.look(log.path);
indb := e != nil && !e.removed();
case log.action {
'a' => # add new file
if(indb){
note(sys->sprint("%q duplicate create", log.path));
return;
}
'c' => # contents
if(!indb){
note(sys->sprint("%q contents but no entry", log.path));
return;
}
'd' => # delete
if(!indb){
note(sys->sprint("%q deleted but no entry", log.path));
return;
}
if(e.d.mtime > log.d.mtime){
note(sys->sprint("%q deleted but it's newer", log.path));
return;
}
'm' => # metadata
if(!indb){
note(sys->sprint("%q metadata but no entry", log.path));
return;
}
* =>
error(sys->sprint("bad log entry: %bd %bd", log.seq>>32, log.seq & big 16rFFFFFFFF));
}
update(db, e, log);
}
#
# update file state e to reflect the effect of the log,
# creating a new entry if necessary
#
update(db: ref Db, e: ref Entry, log: ref Entry)
{
if(e == nil)
e = db.entry(log.seq, log.path, log.d);
e.update(log);
}
rev[T](l: list of T): list of T
{
rl: list of T;
for(; l != nil; l = tl l)
rl = hd l :: rl;
return rl;
}
ensure[T](m: T, path: string)
{
if(m == nil)
error(sys->sprint("can't load %s: %r", path));
}
error(s: string)
{
sys->fprint(sys->fildes(2), "applylog: %s\n", s);
raise "fail:error";
}
note(s: string)
{
sys->fprint(sys->fildes(2), "applylog: note: %s\n", s);
}
warn(s: string)
{
sys->fprint(sys->fildes(2), "applylog: warning: %s\n", s);
nerror++;
}
samestat(a: Sys->Dir, b: Sys->Dir): int
{
# doesn't check permission/ownership, does check QTDIR/QTFILE
if(a.mode & Sys->DMDIR)
return (b.mode & Sys->DMDIR) != 0;
return a.length == b.length && a.mtime == b.mtime && a.qid.qtype == b.qid.qtype; # TO DO: a.name==b.name?
}
samemeta(a: Sys->Dir, b: Sys->Dir): int
{
return a.mode == b.mode && (!setuid || a.uid == b.uid) && (!setgid || a.gid == b.gid) && samestat(a, b);
}
bigof(s: string, base: int): big
{
(b, r) := str->tobig(s, base);
if(r != nil)
error("cruft in integer field in log entry: "+s);
return b;
}
intof(s: string, base: int): int
{
return int bigof(s, base);
}
dumpdb(db: ref Db)
{
for(i := 0; i < db.nstate; i++){
s := db.state[i].text();
if(s != nil)
sys->print("%s\n", s);
}
}
|
