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major re-work of the RCS api.  this results in 100x performance improvements in some places and much
reduced memory usage.  note that only checkout has been fully converted to use the new high-performance
functions.  other codepaths (e.g. update) still use the old method which is provided for backwards
compatibility.  we can convert the remaining slow bits over to the new api piece-by-piece.

"commit this, now" joris@
brad@ tested, too.

/*	$OpenBSD: checkout.c,v 1.70 2007/01/12 23:32:01 niallo Exp $	*/
/*
 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#include "cvs.h"
#include "log.h"
#include "diff.h"
#include "remote.h"

int	cvs_checkout(int, char **);
int	cvs_export(int, char **);
static void checkout_check_repository(int, char **);
static void checkout_repository(const char *, const char *);

extern int prune_dirs;
extern int build_dirs;

struct cvs_cmd cvs_cmd_checkout = {
	CVS_OP_CHECKOUT, 0, "checkout",
	{ "co", "get" },
	"Checkout a working copy of a repository",
	"[-AcflNnPpRs] [-D date | -r tag] [-d dir] [-j rev] [-k mode] "
	"[-t id] module ...",
	"AcD:d:fj:k:lNnPRr:st:",
	NULL,
	cvs_checkout
};

struct cvs_cmd cvs_cmd_export = {
	CVS_OP_EXPORT, 0, "export",
	{ "exp", "ex" },
	"Export sources from CVS, similar to checkout",
	"[-flNnR] [-d dir] [-k mode] -D date | -r rev module ...",
	"D:d:k:flNnRr:",
	NULL,
	cvs_export
};

int
cvs_checkout(int argc, char **argv)
{
	int ch;

	while ((ch = getopt(argc, argv, cvs_cmd_checkout.cmd_opts)) != -1) {
		switch (ch) {
		case 'P':
			prune_dirs = 1;
			break;
		default:
			fatal("%s", cvs_cmd_checkout.cmd_synopsis);
		}
	}

	argc -= optind;
	argv += optind;

	if (argc == 0)
		fatal("%s", cvs_cmd_checkout.cmd_synopsis);

	checkout_check_repository(argc, argv);

	return (0);
}

int
cvs_export(int argc, char **argv)
{
	int ch, flags;

	prune_dirs = 1;
	flags = CR_RECURSE_DIRS;

	while ((ch = getopt(argc, argv, cvs_cmd_export.cmd_opts)) != -1) {
		switch (ch) {
		case 'l':
			flags &= ~CR_RECURSE_DIRS;
			break;
		case 'R':
			break;
		default:
			fatal("%s", cvs_cmd_export.cmd_synopsis);
		}
	}

	argc -= optind;
	argv += optind;

	if (argc == 0)
		fatal("%s", cvs_cmd_export.cmd_synopsis);

	checkout_check_repository(argc, argv);

	return (0);
}

static void
checkout_check_repository(int argc, char **argv)
{
	int i;
	char repo[MAXPATHLEN];
	struct stat st;

	for (i = 0; i < argc; i++) {
		cvs_mkpath(argv[i]);

		if (cvs_path_cat(current_cvsroot->cr_dir, argv[i], repo,
		    sizeof(repo)) >= sizeof(repo))
			fatal("checkout_check_repository: truncation");

		if (stat(repo, &st) == -1) {
			cvs_log(LP_ERR, "cannot find repository %s - ignored",
			    argv[i]);
			continue;
		}

		checkout_repository(repo, argv[i]);
	}
}

static void
checkout_repository(const char *repobase, const char *wdbase)
{
	struct cvs_flisthead fl, dl;
	struct cvs_recursion cr;

	TAILQ_INIT(&fl);
	TAILQ_INIT(&dl);

	build_dirs = 1;
	cr.enterdir = cvs_update_enterdir;
	cr.leavedir = cvs_update_leavedir;
	cr.fileproc = cvs_update_local;
	cr.flags = CR_REPO | CR_RECURSE_DIRS;

	cvs_repository_lock(repobase);
	cvs_repository_getdir(repobase, wdbase, &fl, &dl, 1);

	cvs_file_walklist(&fl, &cr);
	cvs_file_freelist(&fl);

	cvs_repository_unlock(repobase);

	cvs_file_walklist(&dl, &cr);
	cvs_file_freelist(&dl);
}

void
cvs_checkout_file(struct cvs_file *cf, RCSNUM *rnum, BUF *bp, int flags)
{
	BUF *nbp;
	int l, oflags, exists;
	time_t rcstime;
	CVSENTRIES *ent;
	struct timeval tv[2];
	char *p, *entry, rev[16], timebuf[64], tbuf[32], stickytag[32];

	nbp = NULL;

	rcsnum_tostr(rnum, rev, sizeof(rev));

	cvs_log(LP_TRACE, "cvs_checkout_file(%s, %s, %d) -> %s",
	    cf->file_path, rev, flags,
	    (cvs_server_active) ? "to client" : "to disk");

	if (bp != NULL)

	if (flags & CO_DUMP) {
		if (cvs_server_active) {
			cvs_printf("dump file %s to client\n", cf->file_path);
		} else {
			if (nbp == NULL) {
				rcs_rev_write_fd(cf->file_rcs, rnum,
				    STDOUT_FILENO, 1);
			} else {
				if (cvs_buf_write_fd(nbp, STDOUT_FILENO == -1))
					fatal("cvs_checkout_file: %s", strerror(errno));
			}
		}

		return;
	}

	if (cvs_server_active == 0) {
		oflags = O_WRONLY | O_TRUNC;
		if (cf->fd != -1) {
			exists = 1;
			(void)close(cf->fd);
		} else  {
			exists = 0;
			oflags |= O_CREAT;
		}

		cf->fd = open(cf->file_path, oflags);
		if (cf->fd == -1)
			fatal("cvs_checkout_file: open: %s", strerror(errno));

		if (nbp == NULL) {
			rcs_rev_write_fd(cf->file_rcs, rnum, cf->fd, 1);
		} else {
			if (cvs_buf_write_fd(nbp, STDOUT_FILENO == -1))
				fatal("cvs_checkout_file: %s", strerror(errno));
		}

		if (fchmod(cf->fd, 0644) == -1)
			fatal("cvs_checkout_file: fchmod: %s", strerror(errno));

		if (exists == 0) {
			rcstime = rcs_rev_getdate(cf->file_rcs, rnum);
			rcstime = cvs_hack_time(rcstime, 0);
		} else {
			time(&rcstime);
		}

		tv[0].tv_sec = rcstime;
		tv[0].tv_usec = 0;
		tv[1] = tv[0];
		if (futimes(cf->fd, tv) == -1)
			fatal("cvs_checkout_file: futimes: %s",
			    strerror(errno));
	} else {
		time(&rcstime);
	}

	rcstime = cvs_hack_time(rcstime, 1);

	ctime_r(&rcstime, tbuf);
	if (tbuf[strlen(tbuf) - 1] == '\n')
		tbuf[strlen(tbuf) - 1] = '\0';

	if (flags & CO_MERGE) {
		l = snprintf(timebuf, sizeof(timebuf), "Result of merge+%s",
		    tbuf);
		if (l == -1 || l >= (int)sizeof(timebuf))
			fatal("cvs_checkout_file: overflow");
	} else {
		strlcpy(timebuf, tbuf, sizeof(timebuf));
	}

	if (flags & CO_SETSTICKY) {
		l = snprintf(stickytag, sizeof(stickytag), "T%s", rev);
		if (l == -1 || l >= (int)sizeof(stickytag))
			fatal("cvs_checkout_file: overflow");
	} else {
		stickytag[0] = '\0';
	}

	entry = xmalloc(CVS_ENT_MAXLINELEN);
	l = snprintf(entry, CVS_ENT_MAXLINELEN, "/%s/%s/%s//%s", cf->file_name,
	    rev, timebuf, stickytag);

	if (cvs_server_active == 0) {
		ent = cvs_ent_open(cf->file_wd);
		cvs_ent_add(ent, entry);
		cvs_ent_close(ent, ENT_SYNC);
	} else {
		if ((p = strrchr(cf->file_rpath, ',')) != NULL)
			*p = '\0';

		if (flags & CO_COMMIT)
			cvs_server_update_entry("Checked-in", cf);
		else
			cvs_server_update_entry("Updated", cf);

		cvs_remote_output(entry);

		if (!(flags & CO_COMMIT)) {
			cvs_remote_output("u=rw,g=rw,o=rw");

			/* XXX */
			printf("%ld\n", cvs_buf_len(nbp));

			if (cvs_buf_write_fd(nbp, STDOUT_FILENO) == -1)
				fatal("cvs_checkout_file: failed to send file");
			cvs_buf_free(nbp);
		}

		if (p != NULL)
			*p = ',';
	}

	xfree(entry);
}