db_find_compiled_state.c

/*
 * db_find_compiled_state.c
 *
 * Copyright (c) 2018-2021 Eric Vidal <eric@obarun.org>
 *
 * All rights reserved.
 *
 * This file is part of Obarun. It is subject to the license terms in
 * the LICENSE file found in the top-level directory of this
 * distribution.
 * This file may not be copied, modified, propagated, or distributed
 * except according to the terms contained in the LICENSE file./
 */

#include <66/utils.h>

#include <sys/stat.h>

#include <oblibs/log.h>

#include <skalibs/stralloc.h>
#include <skalibs/djbunix.h>

#include <66/constants.h>

/** return 1-> backup
 * return 0-> src
 * -1->not initiated */
int db_find_compiled_state(char const *livetree, char const *treename)
{
    log_flow() ;

    int r ;
    size_t treelen = strlen(livetree) ;
    size_t namelen = strlen(treename) ;

    struct stat st ;

    char current[treelen + 1 + namelen + 9 + 1] ;
    memcpy(current, livetree, treelen) ;
    current[treelen] = '/' ;
    memcpy(current + treelen + 1, treename,namelen) ;
    memcpy(current + treelen + 1 + namelen, "/compiled", 9) ;
    current[treelen + 1 + namelen + 9] = 0 ;

    if(lstat(current,&st) < 0) return -1 ;
    if(!(S_ISLNK(st.st_mode)))
        log_warnu_return(LOG_EXIT_LESSONE,"find symlink: ",current) ;

    stralloc symreal = STRALLOC_ZERO ;

    r = sarealpath(&symreal,current) ;
    if (r < 0 )
    {
        stralloc_free(&symreal) ;
        log_warnu_return(LOG_EXIT_LESSONE,"find real path: ",current) ;
    }
    char *b = NULL ;
    b = memmem(symreal.s,symreal.len,SS_BACKUP,SS_BACKUP_LEN) ;

    stralloc_free(&symreal) ;

    if (!b) return 0 ;

    return 1 ;
}