Annotation of embedaddon/rsync/delete.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Deletion routines used in rsync.
                      3:  *
                      4:  * Copyright (C) 1996-2000 Andrew Tridgell
                      5:  * Copyright (C) 1996 Paul Mackerras
                      6:  * Copyright (C) 2002 Martin Pool <mbp@samba.org>
                      7:  * Copyright (C) 2003-2013 Wayne Davison
                      8:  *
                      9:  * This program is free software; you can redistribute it and/or modify
                     10:  * it under the terms of the GNU General Public License as published by
                     11:  * the Free Software Foundation; either version 3 of the License, or
                     12:  * (at your option) any later version.
                     13:  *
                     14:  * This program is distributed in the hope that it will be useful,
                     15:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     16:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     17:  * GNU General Public License for more details.
                     18:  *
                     19:  * You should have received a copy of the GNU General Public License along
                     20:  * with this program; if not, visit the http://fsf.org website.
                     21:  */
                     22: 
                     23: #include "rsync.h"
                     24: 
                     25: extern int am_root;
                     26: extern int make_backups;
                     27: extern int max_delete;
                     28: extern char *backup_dir;
                     29: extern char *backup_suffix;
                     30: extern int backup_suffix_len;
                     31: extern struct stats stats;
                     32: 
                     33: int ignore_perishable = 0;
                     34: int non_perishable_cnt = 0;
                     35: int skipped_deletes = 0;
                     36: 
                     37: static inline int is_backup_file(char *fn)
                     38: {
                     39:        int k = strlen(fn) - backup_suffix_len;
                     40:        return k > 0 && strcmp(fn+k, backup_suffix) == 0;
                     41: }
                     42: 
                     43: /* The directory is about to be deleted: if DEL_RECURSE is given, delete all
                     44:  * its contents, otherwise just checks for content.  Returns DR_SUCCESS or
                     45:  * DR_NOT_EMPTY.  Note that fname must point to a MAXPATHLEN buffer!  (The
                     46:  * buffer is used for recursion, but returned unchanged.)
                     47:  */
                     48: static enum delret delete_dir_contents(char *fname, uint16 flags)
                     49: {
                     50:        struct file_list *dirlist;
                     51:        enum delret ret;
                     52:        unsigned remainder;
                     53:        void *save_filters;
                     54:        int j, dlen;
                     55:        char *p;
                     56: 
                     57:        if (DEBUG_GTE(DEL, 3)) {
                     58:                rprintf(FINFO, "delete_dir_contents(%s) flags=%d\n",
                     59:                        fname, flags);
                     60:        }
                     61: 
                     62:        dlen = strlen(fname);
                     63:        save_filters = push_local_filters(fname, dlen);
                     64: 
                     65:        non_perishable_cnt = 0;
                     66:        dirlist = get_dirlist(fname, dlen, 0);
                     67:        ret = non_perishable_cnt ? DR_NOT_EMPTY : DR_SUCCESS;
                     68: 
                     69:        if (!dirlist->used)
                     70:                goto done;
                     71: 
                     72:        if (!(flags & DEL_RECURSE)) {
                     73:                ret = DR_NOT_EMPTY;
                     74:                goto done;
                     75:        }
                     76: 
                     77:        p = fname + dlen;
                     78:        if (dlen != 1 || *fname != '/')
                     79:                *p++ = '/';
                     80:        remainder = MAXPATHLEN - (p - fname);
                     81: 
                     82:        /* We do our own recursion, so make delete_item() non-recursive. */
                     83:        flags = (flags & ~(DEL_RECURSE|DEL_MAKE_ROOM|DEL_NO_UID_WRITE))
                     84:              | DEL_DIR_IS_EMPTY;
                     85: 
                     86:        for (j = dirlist->used; j--; ) {
                     87:                struct file_struct *fp = dirlist->files[j];
                     88: 
                     89:                if (fp->flags & FLAG_MOUNT_DIR && S_ISDIR(fp->mode)) {
                     90:                        if (DEBUG_GTE(DEL, 1)) {
                     91:                                rprintf(FINFO,
                     92:                                    "mount point, %s, pins parent directory\n",
                     93:                                    f_name(fp, NULL));
                     94:                        }
                     95:                        ret = DR_NOT_EMPTY;
                     96:                        continue;
                     97:                }
                     98: 
                     99:                strlcpy(p, fp->basename, remainder);
                    100:                if (!(fp->mode & S_IWUSR) && !am_root && fp->flags & FLAG_OWNED_BY_US)
                    101:                        do_chmod(fname, fp->mode | S_IWUSR);
                    102:                /* Save stack by recursing to ourself directly. */
                    103:                if (S_ISDIR(fp->mode)) {
                    104:                        if (delete_dir_contents(fname, flags | DEL_RECURSE) != DR_SUCCESS)
                    105:                                ret = DR_NOT_EMPTY;
                    106:                }
                    107:                if (delete_item(fname, fp->mode, flags) != DR_SUCCESS)
                    108:                        ret = DR_NOT_EMPTY;
                    109:        }
                    110: 
                    111:        fname[dlen] = '\0';
                    112: 
                    113:   done:
                    114:        flist_free(dirlist);
                    115:        pop_local_filters(save_filters);
                    116: 
                    117:        if (ret == DR_NOT_EMPTY) {
                    118:                rprintf(FINFO, "cannot delete non-empty directory: %s\n",
                    119:                        fname);
                    120:        }
                    121:        return ret;
                    122: }
                    123: 
                    124: /* Delete a file or directory.  If DEL_RECURSE is set in the flags, this will
                    125:  * delete recursively.
                    126:  *
                    127:  * Note that fbuf must point to a MAXPATHLEN buffer if the mode indicates it's
                    128:  * a directory! (The buffer is used for recursion, but returned unchanged.)
                    129:  */
                    130: enum delret delete_item(char *fbuf, uint16 mode, uint16 flags)
                    131: {
                    132:        enum delret ret;
                    133:        char *what;
                    134:        int ok;
                    135: 
                    136:        if (DEBUG_GTE(DEL, 2)) {
                    137:                rprintf(FINFO, "delete_item(%s) mode=%o flags=%d\n",
                    138:                        fbuf, (int)mode, (int)flags);
                    139:        }
                    140: 
                    141:        if (flags & DEL_NO_UID_WRITE)
                    142:                do_chmod(fbuf, mode | S_IWUSR);
                    143: 
                    144:        if (S_ISDIR(mode) && !(flags & DEL_DIR_IS_EMPTY)) {
                    145:                /* This only happens on the first call to delete_item() since
                    146:                 * delete_dir_contents() always calls us w/DEL_DIR_IS_EMPTY. */
                    147:                ignore_perishable = 1;
                    148:                /* If DEL_RECURSE is not set, this just reports emptiness. */
                    149:                ret = delete_dir_contents(fbuf, flags);
                    150:                ignore_perishable = 0;
                    151:                if (ret == DR_NOT_EMPTY || ret == DR_AT_LIMIT)
                    152:                        goto check_ret;
                    153:                /* OK: try to delete the directory. */
                    154:        }
                    155: 
                    156:        if (!(flags & DEL_MAKE_ROOM) && max_delete >= 0 && stats.deleted_files >= max_delete) {
                    157:                skipped_deletes++;
                    158:                return DR_AT_LIMIT;
                    159:        }
                    160: 
                    161:        if (S_ISDIR(mode)) {
                    162:                what = "rmdir";
                    163:                ok = do_rmdir(fbuf) == 0;
                    164:        } else {
                    165:                if (make_backups > 0 && !(flags & DEL_FOR_BACKUP) && (backup_dir || !is_backup_file(fbuf))) {
                    166:                        what = "make_backup";
                    167:                        ok = make_backup(fbuf, True);
                    168:                        if (ok == 2) {
                    169:                                what = "unlink";
                    170:                                ok = robust_unlink(fbuf) == 0;
                    171:                        }
                    172:                } else {
                    173:                        what = "unlink";
                    174:                        ok = robust_unlink(fbuf) == 0;
                    175:                }
                    176:        }
                    177: 
                    178:        if (ok) {
                    179:                if (!(flags & DEL_MAKE_ROOM)) {
                    180:                        log_delete(fbuf, mode);
                    181:                        stats.deleted_files++;
                    182:                        if (S_ISREG(mode)) {
                    183:                                /* Nothing more to count */
                    184:                        } else if (S_ISDIR(mode))
                    185:                                stats.deleted_dirs++;
                    186: #ifdef SUPPORT_LINKS
                    187:                        else if (S_ISLNK(mode))
                    188:                                stats.deleted_symlinks++;
                    189: #endif
                    190:                        else if (IS_DEVICE(mode))
                    191:                                stats.deleted_symlinks++;
                    192:                        else
                    193:                                stats.deleted_specials++;
                    194:                }
                    195:                ret = DR_SUCCESS;
                    196:        } else {
                    197:                if (S_ISDIR(mode) && errno == ENOTEMPTY) {
                    198:                        rprintf(FINFO, "cannot delete non-empty directory: %s\n",
                    199:                                fbuf);
                    200:                        ret = DR_NOT_EMPTY;
                    201:                } else if (errno != ENOENT) {
                    202:                        rsyserr(FERROR, errno, "delete_file: %s(%s) failed",
                    203:                                what, fbuf);
                    204:                        ret = DR_FAILURE;
                    205:                } else
                    206:                        ret = DR_SUCCESS;
                    207:        }
                    208: 
                    209:   check_ret:
                    210:        if (ret != DR_SUCCESS && flags & DEL_MAKE_ROOM) {
                    211:                const char *desc;
                    212:                switch (flags & DEL_MAKE_ROOM) {
                    213:                case DEL_FOR_FILE: desc = "regular file"; break;
                    214:                case DEL_FOR_DIR: desc = "directory"; break;
                    215:                case DEL_FOR_SYMLINK: desc = "symlink"; break;
                    216:                case DEL_FOR_DEVICE: desc = "device file"; break;
                    217:                case DEL_FOR_SPECIAL: desc = "special file"; break;
                    218:                default: exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
                    219:                }
                    220:                rprintf(FERROR_XFER, "could not make way for %s %s: %s\n",
                    221:                        flags & DEL_FOR_BACKUP ? "backup" : "new",
                    222:                        desc, fbuf);
                    223:        }
                    224:        return ret;
                    225: }
                    226: 
                    227: uint16 get_del_for_flag(uint16 mode)
                    228: {
                    229:        if (S_ISREG(mode))
                    230:                return DEL_FOR_FILE;
                    231:        if (S_ISDIR(mode))
                    232:                return DEL_FOR_DIR;
                    233:        if (S_ISLNK(mode))
                    234:                return DEL_FOR_SYMLINK;
                    235:        if (IS_DEVICE(mode))
                    236:                return DEL_FOR_DEVICE;
                    237:        if (IS_SPECIAL(mode))
                    238:                return DEL_FOR_SPECIAL;
                    239:        exit_cleanup(RERR_UNSUPPORTED); /* IMPOSSIBLE */
                    240: }

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