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Currently co(1) overwrites files that the current user doesn't have
write permissions for.  If you own the directory, that means your
existing file, mode 000, is blown away without prompting you.  GNU
RCS does this as well.

This fixes changes co(1) to always prompt if a file exists.  This
breaks GNU compatibility but I think it's more important that we
prevent co(1) from overwriting files with strict permissions without
even prompting.

``makes sense'' xsa to an earlier diff

/*	$OpenBSD: co.c,v 1.61 2006/03/16 04:01:46 ray Exp $	*/
/*
 * Copyright (c) 2005 Joris Vink <joris@openbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL  DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "includes.h"

#include "rcsprog.h"

#define CO_OPTSTRING	"d:f::k:l::M::p::q::r::s:Tu::Vw::x:z:"

static void	checkout_err_nobranch(RCSFILE *, const char *, const char *,
    const char *, int);

int
checkout_main(int argc, char **argv)
{
	int i, ch, flags, kflag;
	RCSNUM *frev, *rev;
	RCSFILE *file;
	char fpath[MAXPATHLEN];
	char *author, *username, *date;
	const char *state;
	time_t rcs_mtime = -1;

	flags = 0;
	kflag = RCS_KWEXP_ERR;
	rev = RCS_HEAD_REV;
	frev = NULL;
	state = NULL;
	author = NULL;
	date = NULL;

	while ((ch = rcs_getopt(argc, argv, CO_OPTSTRING)) != -1) {
		switch (ch) {
		case 'd':
			date = xstrdup(rcs_optarg);
			break;
		case 'f':
			rcs_set_rev(rcs_optarg, &rev);
			flags |= FORCE;
			break;
		case 'k':
			kflag = rcs_kflag_get(rcs_optarg);
			if (RCS_KWEXP_INVAL(kflag)) {
				cvs_log(LP_ERR,
				    "invalid RCS keyword expansion mode");
				(usage)();
				exit(1);
			}
			break;
		case 'l':
			rcs_set_rev(rcs_optarg, &rev);
			if (flags & CO_UNLOCK) {
				cvs_log(LP_ERR, "warning: -u overridden by -l");
				flags &= ~CO_UNLOCK;
			}
			flags |= CO_LOCK;
			break;
		case 'M':
			rcs_set_rev(rcs_optarg, &rev);
			flags |= CO_REVDATE;
			break;
		case 'p':
			rcs_set_rev(rcs_optarg, &rev);
			pipeout = 1;
			break;
		case 'q':
			rcs_set_rev(rcs_optarg, &rev);
			verbose = 0;
			break;
		case 'r':
			rcs_set_rev(rcs_optarg, &rev);
			break;
		case 's':
			state = xstrdup(rcs_optarg);
			flags |= CO_STATE;
			break;
		case 'T':
			flags |= PRESERVETIME;
			break;
		case 'u':
			rcs_set_rev(rcs_optarg, &rev);
			if (flags & CO_LOCK) {
				cvs_log(LP_ERR, "warning: -l overridden by -u");
				flags &= ~CO_LOCK;
			}
			flags |= CO_UNLOCK;
			break;
		case 'V':
			printf("%s\n", rcs_version);
			exit(0);
		case 'w':
			/* if no argument, assume current user */
			if (rcs_optarg == NULL) {
				if ((author = getlogin()) == NULL)
					fatal("getlogin failed");
			} else
				author = xstrdup(rcs_optarg);
			flags |= CO_AUTHOR;
			break;
		case 'x':
			rcs_suffixes = rcs_optarg;
			break;
		case 'z':
			timezone_flag = rcs_optarg;
			break;
		default:
			(usage)();
			exit(1);
		}
	}

	argc -= rcs_optind;
	argv += rcs_optind;

	if (argc == 0) {
		cvs_log(LP_ERR, "no input file");
		(usage)();
		exit (1);
	}

	if ((username = getlogin()) == NULL) {
		cvs_log(LP_ERRNO, "failed to get username");
		exit (1);
	}

	for (i = 0; i < argc; i++) {
		if (rcs_statfile(argv[i], fpath, sizeof(fpath)) < 0)
			continue;

		if (verbose == 1)
			printf("%s  -->  %s\n", fpath,
			    (pipeout == 1) ? "standard output" : argv[i]);

		if ((flags & CO_LOCK) && (kflag & RCS_KWEXP_VAL)) {
			cvs_log(LP_ERR, "%s: cannot combine -kv and -l", fpath);
			continue;
		}

		if ((file = rcs_open(fpath, RCS_RDWR|RCS_PARSE_FULLY)) == NULL)
			continue;

		if (flags & PRESERVETIME)
			rcs_mtime = rcs_get_mtime(file->rf_path);

		if (kflag != RCS_KWEXP_ERR)
			rcs_kwexp_set(file, kflag);

		if (rev == RCS_HEAD_REV)
			frev = file->rf_head;
		else
			frev = rev;

		if (checkout_rev(file, frev, argv[i], flags,
		    username, author, state, date) < 0) {
				rcs_close(file);
				continue;
		}

		if (verbose == 1)
			printf("done\n");

		rcs_close(file);

		if (flags & PRESERVETIME)
			rcs_set_mtime(fpath, rcs_mtime);
	}

	if (rev != RCS_HEAD_REV)
		rcsnum_free(frev);

	return (0);
}

void
checkout_usage(void)
{
	fprintf(stderr,
	    "usage: co [-TV] [-ddate] [-f[rev]] [-I[rev]] [-kmode] [-l[rev]]\n"
	    "          [-M[rev]] [-p[rev]] [-q[rev]] [-r[rev]] [-sstate]\n"
	    "          [-u[rev]] [-w[user]] [-xsuffixes] [-ztz] file ...\n");
}

/*
 * Checkout revision <rev> from RCSFILE <file>, writing it to the path <dst>
 * Currenly recognised <flags> are CO_LOCK, CO_UNLOCK and CO_REVDATE.
 *
 * Looks up revision based upon <lockname>, <author>, <state> and <date>
 *
 * Returns 0 on success, -1 on failure.
 */
int
checkout_rev(RCSFILE *file, RCSNUM *frev, const char *dst, int flags,
    const char *lockname, const char *author, const char *state,
    const char *date)
{
	BUF *bp;
	int lcount;
	char buf[16];
	mode_t mode = 0444;
	struct stat st;
	struct rcs_delta *rdp;
	struct rcs_lock *lkp;
	char *content, msg[128], *fdate;
	time_t rcsdate, givendate;

	rcsdate = givendate = -1;
	if (date != NULL)
		givendate = cvs_date_parse(date);

	/* Check out the latest revision if <frev> is greater than HEAD */
	if (rcsnum_cmp(frev, file->rf_head, 0) == -1)
		frev = file->rf_head;

	lcount = 0;
	TAILQ_FOREACH(lkp, &(file->rf_locks), rl_list) {
		if (!strcmp(lkp->rl_name, lockname))
			lcount++;
	}

	/*
	 * If the user didn't specify any revision, we cycle through
	 * revisions to lookup the first one that matches what he specified.
	 *
	 * If we cannot find one, we return an error.
	 */
	rdp = NULL;
	if (frev == file->rf_head) {
		if (lcount > 1) {
			cvs_log(LP_WARN,
			    "multiple revisions locked by %s; "
			    "please specify one", lockname);
			return (-1);
		}

		TAILQ_FOREACH(rdp, &file->rf_delta, rd_list) {
			if (date != NULL) {
				fdate = asctime(&rdp->rd_date);
				rcsdate = cvs_date_parse(fdate);
				if (givendate <= rcsdate)
					continue;
			}

			if ((author != NULL) &&
			    (strcmp(rdp->rd_author, author)))
				continue;

			if ((state != NULL) &&
			    (strcmp(rdp->rd_state, state)))
				continue;

			frev = rdp->rd_num;
			break;
		}
	} else {
		rdp = rcs_findrev(file, frev);
	}

	if (rdp == NULL) {
		checkout_err_nobranch(file, author, date, state, flags);
		return (-1);
	}

	rcsnum_tostr(frev, buf, sizeof(buf));

	if (rdp->rd_locker != NULL) {
		if (strcmp(lockname, rdp->rd_locker)) {
			strlcpy(msg, "Revision %s is already locked by %s; ",
			    sizeof(msg));
			if (flags & CO_UNLOCK)
				strlcat(msg, "use co -r or rcs -u", sizeof(msg));
			cvs_log(LP_ERR, msg, buf, rdp->rd_locker);
			return (-1);
		}
	}

	if ((verbose == 1) && !(flags & NEWFILE))
		printf("revision %s", buf);


	if ((bp = rcs_getrev(file, frev)) == NULL) {
		cvs_log(LP_ERR, "cannot find revision `%s'", buf);
		return (-1);
	}
	/*
	 * Do keyword expansion if required.
	 */
	bp = rcs_kwexp_buf(bp, file, frev);

	if (flags & CO_LOCK) {
		if ((lockname != NULL)
		    && (rcs_lock_add(file, lockname, frev) < 0)) {
			if (rcs_errno != RCS_ERR_DUPENT)
				return (-1);
		}

		mode = 0644;
		if ((verbose == 1) && !(flags & NEWFILE))
			printf(" (locked)");
	} else if (flags & CO_UNLOCK) {
		if (rcs_lock_remove(file, lockname, frev) < 0) {
			if (rcs_errno != RCS_ERR_NOENT)
				return (-1);
		}

		mode = 0444;
		if ((verbose == 1) && !(flags & NEWFILE))
			printf(" (unlocked)");
	}

	if ((verbose == 1) && !(flags & NEWFILE))
		printf("\n");

	if (flags & CO_LOCK) {
		lcount++;
		if (lcount > 1)
			cvs_log(LP_WARN, "You now have %d locks.", lcount);
	}

	if ((pipeout == 0) && (stat(dst, &st) == 0) && !(flags & FORCE)) {
		if (verbose == 0) {
			cvs_log(LP_ERR,
			    "writable %s exists; checkout aborted",
			    dst);
			return (-1);
		}

		if (st.st_mode & S_IWUSR)
			printf("writable ");
		printf("%s exists%s; ", dst,
		    (getuid() == st.st_uid) ? "" :
		    ", and you do not own it");
		printf("remove it? [ny](n): ");
		/* default is n */
		if (cvs_yesno() == -1) {
			cvs_log(LP_ERR, "checkout aborted");
			return (-1);
		}
	}

	if (pipeout == 1) {
		cvs_buf_putc(bp, '\0');
		content = cvs_buf_release(bp);
		printf("%s", content);
		xfree(content);
	} else {
		if (cvs_buf_write(bp, dst, mode) < 0) {
			cvs_log(LP_ERR, "failed to write revision to file");
			cvs_buf_free(bp);
			return (-1);
		}
		cvs_buf_free(bp);
		if (flags & CO_REVDATE) {
			struct timeval tv[2];
			memset(&tv, 0, sizeof(tv));
			tv[0].tv_sec = (long)rcs_rev_getdate(file, frev);
			tv[1].tv_sec = tv[0].tv_sec;
			if (utimes(dst, (const struct timeval *)&tv) < 0)
				cvs_log(LP_ERRNO, "error setting utimes");
		}
	}

	return (0);
}

/*
 * checkout_err_nobranch()
 *
 * XXX - should handle the dates too.
 */
static void
checkout_err_nobranch(RCSFILE *file, const char *author, const char *date,
    const char *state, int flags)
{
	if (!(flags & CO_AUTHOR))
		author = NULL;
	if (!(flags & CO_STATE))
		state = NULL;

	cvs_log(LP_ERR, "%s: No revision on branch has%s%s%s%s%s%s.",
	    file->rf_path,
	    date ? " a date before " : "",
	    date ? date : "",
	    author ? " and author " + (date ? 0:4 ) : "",
	    author ? author : "",
	    state  ? " and state " + (date || author ? 0:4) : "",
	    state  ? state : "");
}