/*
 * Copyright (c) 1992, Brian Berliner and Jeff Polk
 * Copyright (c) 1989-1992, Brian Berliner
 * 
 * You may distribute under the terms of the GNU General Public License as
 * specified in the README file that comes with the CVS 1.3 kit.
 * 
 * Name of Repository
 * 
 * Determine the name of the RCS repository and sets "Repository" accordingly.
 */

#include "cvs.h"

#ifndef lint
static char rcsid[] = "@(#)repos.c 1.28 92/03/31";
#endif

char *
Name_Repository (dir, update_dir)
    char *dir;
    char *update_dir;
{
    FILE *fpin;
    char *ret, *xupdate_dir;
    char repos[PATH_MAX];
    char path[PATH_MAX];
    char tmp[PATH_MAX];
    char cvsadm[PATH_MAX];
    char ocvsadm[PATH_MAX];
    char *cp;
    int has_cvsadm = 0, has_ocvsadm = 0;

    if (update_dir && *update_dir)
	xupdate_dir = update_dir;
    else
	xupdate_dir = ".";

    if (dir != NULL)
    {
	(void) sprintf (cvsadm, "%s/%s", dir, CVSADM);
	(void) sprintf (ocvsadm, "%s/%s", dir, OCVSADM);
    }
    else
    {
	(void) strcpy (cvsadm, CVSADM);
	(void) strcpy (ocvsadm, OCVSADM);
    }

    /* sanity checks */
    if (!(has_cvsadm = isdir (cvsadm)) && !(has_ocvsadm = isdir (ocvsadm)))
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (1, 0, "there is no version here; do '%s checkout' first",
	       program_name);
    }

    if (has_ocvsadm)
    {
	if (has_cvsadm)
	{
	    error (0, 0, "in directory %s:", xupdate_dir);
	    error (1, 0, "error: both `%s' and `%s' exist; I give up",
		   CVSADM, OCVSADM);
	}
	if (rename (ocvsadm, cvsadm) < 0)
	{
	    error (0, 0, "in directory %s:", xupdate_dir);
	    error (1, errno, "cannot rename `%s' to `%s'; I give up",
		   OCVSADM, CVSADM);
	}

	/*
	 * We have converted the old CVS.adm directory to the new CVS
	 * directory.  Now, convert the Entries file to the new format, if
	 * necessary.
	 */
	check_entries (dir);
    }

    if (dir != NULL)
	(void) sprintf (tmp, "%s/%s", dir, CVSADM_ENT);
    else
	(void) strcpy (tmp, CVSADM_ENT);

    if (!isreadable (tmp))
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (1, 0, "*PANIC* administration files missing");
    }

    if (dir != NULL)
	(void) sprintf (tmp, "%s/%s", dir, CVSADM_REP);
    else
	(void) strcpy (tmp, CVSADM_REP);

    if (!isreadable (tmp))
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (1, 0, "*PANIC* administration files missing");
    }

    /*
     * The assumption here is that the repository is always contained in the
     * first line of the "Repository" file.
     */
    fpin = open_file (tmp, "r");

    if (fgets (repos, PATH_MAX, fpin) == NULL)
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (1, errno, "cannot read %s", CVSADM_REP);
    }
    (void) fclose (fpin);
    if ((cp = rindex (repos, '\n')) != NULL)
	*cp = '\0';			/* strip the newline */

    /*
     * If this is a relative repository pathname, turn it into an absolute
     * one by tacking on the CVSROOT environment variable. If the CVSROOT
     * environment variable is not set, die now.
     */
    if (strcmp (repos, "..") == 0 || strncmp (repos, "../", 3) == 0)
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (0, 0, "`..'-relative repositories are not supported.");
	error (1, 0, "illegal source repository");
    }
    if (repos[0] != '/')
    {
	if (CVSroot == NULL)
	{
	    error (0, 0, "in directory %s:", xupdate_dir);
	    error (0, 0, "must set the CVSROOT environment variable\n");
	    error (0, 0, "or specify the '-d' option to %s.", program_name);
	    error (1, 0, "illegal repository setting");
	}
	(void) strcpy (path, repos);
	(void) sprintf (repos, "%s/%s", CVSroot, path);
    }
    if (!isdir (repos))
    {
	error (0, 0, "in directory %s:", xupdate_dir);
	error (1, 0, "there is no repository %s", repos);
    }

    /* allocate space to return and fill it in */
    strip_path (repos);
    ret = xstrdup (repos);
    return (ret);
}

/*
 * Return a pointer to the repository name relative to CVSROOT from a
 * possibly fully qualified repository
 */
char *
Short_Repository (repository)
    char *repository;
{
    if (repository == NULL)
	return (NULL);

    /* if repository matches CVSroot at the beginning, strip off CVSroot */
    if (strncmp (CVSroot, repository, strlen (CVSroot)) == 0)
	return (repository + strlen (CVSroot) + 1);
    else
	return (repository);
}