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dir.c
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/*-------------------------------------------------------------------------
*
* dir.c: directory operation utility.
*
* Portions Copyright (c) 2009-2013, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
* Portions Copyright (c) 2015-2022, Postgres Professional
*
*-------------------------------------------------------------------------
*/
#include <assert.h>
#include "pg_probackup.h"
#include "utils/file.h"
#if PG_VERSION_NUM < 110000
#include "catalog/catalog.h"
#endif
#include "catalog/pg_tablespace.h"
#include <unistd.h>
#include <sys/stat.h>
#include <dirent.h>
#include "utils/configuration.h"
/*
* The contents of these directories are removed or recreated during server
* start so they are not included in backups. The directories themselves are
* kept and included as empty to preserve access permissions.
*/
static const char *pgdata_exclude_dir[] =
{
PG_XLOG_DIR,
/*
* Skip temporary statistics files. PG_STAT_TMP_DIR must be skipped even
* when stats_temp_directory is set because PGSS_TEXT_FILE is always created
* there.
*/
"pg_stat_tmp",
"pgsql_tmp",
/*
* It is generally not useful to backup the contents of this directory even
* if the intention is to restore to another master. See backup.sgml for a
* more detailed description.
*/
"pg_replslot",
/* Contents removed on startup, see dsm_cleanup_for_mmap(). */
"pg_dynshmem",
/* Contents removed on startup, see AsyncShmemInit(). */
"pg_notify",
/*
* Old contents are loaded for possible debugging but are not required for
* normal operation, see OldSerXidInit().
*/
"pg_serial",
/* Contents removed on startup, see DeleteAllExportedSnapshotFiles(). */
"pg_snapshots",
/* Contents zeroed on startup, see StartupSUBTRANS(). */
"pg_subtrans",
/* end of list */
NULL, /* pg_log will be set later */
NULL
};
static char *pgdata_exclude_files[] =
{
/* Skip auto conf temporary file. */
"postgresql.auto.conf.tmp",
/* Skip current log file temporary file */
"current_logfiles.tmp",
"recovery.conf",
"postmaster.pid",
"postmaster.opts",
"probackup_recovery.conf",
"recovery.signal",
"standby.signal",
NULL
};
static char *pgdata_exclude_files_non_exclusive[] =
{
/*skip in non-exclusive backup */
"backup_label",
"tablespace_map",
NULL
};
/* Tablespace mapping structures */
typedef struct TablespaceListCell
{
struct TablespaceListCell *next;
char old_dir[MAXPGPATH];
char new_dir[MAXPGPATH];
} TablespaceListCell;
typedef struct TablespaceList
{
TablespaceListCell *head;
TablespaceListCell *tail;
} TablespaceList;
typedef struct TablespaceCreatedListCell
{
struct TablespaceCreatedListCell *next;
char link_name[MAXPGPATH];
char linked_dir[MAXPGPATH];
} TablespaceCreatedListCell;
typedef struct TablespaceCreatedList
{
TablespaceCreatedListCell *head;
TablespaceCreatedListCell *tail;
} TablespaceCreatedList;
static char dir_check_file(pgFile *file, bool backup_logs);
static void dir_list_file_internal(parray *files, pgFile *parent, const char *parent_dir,
bool exclude, bool follow_symlink, bool backup_logs,
bool skip_hidden, int external_dir_num, fio_location location);
static void opt_path_map(ConfigOption *opt, const char *arg,
TablespaceList *list, const char *type);
static void cleanup_tablespace(const char *path);
static void control_string_bad_format(const char* str);
/* Tablespace mapping */
static TablespaceList tablespace_dirs = {NULL, NULL};
/* Extra directories mapping */
static TablespaceList external_remap_list = {NULL, NULL};
/*
* Create directory, also create parent directories if necessary.
* In strict mode treat already existing directory as error.
* Return values:
* 0 - ok
* -1 - error (check errno)
*/
int
dir_create_dir(const char *dir, mode_t mode, bool strict)
{
char parent[MAXPGPATH];
strncpy(parent, dir, MAXPGPATH);
get_parent_directory(parent);
/* Create parent first */
if (access(parent, F_OK) == -1)
dir_create_dir(parent, mode, false);
/* Create directory */
if (mkdir(dir, mode) == -1)
{
if (errno == EEXIST && !strict) /* already exist */
return 0;
return -1;
}
return 0;
}
pgFile *
pgFileNew(const char *path, const char *rel_path, bool follow_symlink,
int external_dir_num, fio_location location)
{
struct stat st;
pgFile *file;
/* stat the file */
if (fio_stat(path, &st, follow_symlink, location) < 0)
{
/* file not found is not an error case */
if (errno == ENOENT)
return NULL;
elog(ERROR, "cannot stat file \"%s\": %s", path,
strerror(errno));
}
file = pgFileInit(rel_path);
file->size = st.st_size;
file->mode = st.st_mode;
file->mtime = st.st_mtime;
file->external_dir_num = external_dir_num;
return file;
}
pgFile *
pgFileInit(const char *rel_path)
{
pgFile *file;
char *file_name = NULL;
file = (pgFile *) pgut_malloc(sizeof(pgFile));
MemSet(file, 0, sizeof(pgFile));
file->rel_path = pgut_strdup(rel_path);
canonicalize_path(file->rel_path);
/* Get file name from the path */
file_name = last_dir_separator(file->rel_path);
if (file_name == NULL)
file->name = file->rel_path;
else
{
file_name++;
file->name = file_name;
}
/* Number of blocks readed during backup */
file->n_blocks = BLOCKNUM_INVALID;
/* Number of blocks backed up during backup */
file->n_headers = 0;
// May be add?
// pg_atomic_clear_flag(file->lock);
file->excluded = false;
return file;
}
/*
* Delete file pointed by the pgFile.
* If the pgFile points directory, the directory must be empty.
*/
void
pgFileDelete(mode_t mode, const char *full_path)
{
if (S_ISDIR(mode))
{
if (rmdir(full_path) == -1)
{
if (errno == ENOENT)
return;
else if (errno == ENOTDIR) /* could be symbolic link */
goto delete_file;
elog(ERROR, "Cannot remove directory \"%s\": %s",
full_path, strerror(errno));
}
return;
}
delete_file:
if (remove(full_path) == -1)
{
if (errno == ENOENT)
return;
elog(ERROR, "Cannot remove file \"%s\": %s", full_path,
strerror(errno));
}
}
/*
* Read the local file to compute its CRC.
* We cannot make decision about file decompression because
* user may ask to backup already compressed files and we should be
* obvious about it.
*/
pg_crc32
pgFileGetCRC(const char *file_path, bool use_crc32c, bool missing_ok)
{
FILE *fp;
pg_crc32 crc = 0;
char *buf;
size_t len = 0;
INIT_FILE_CRC32(use_crc32c, crc);
/* open file in binary read mode */
fp = fopen(file_path, PG_BINARY_R);
if (fp == NULL)
{
if (errno == ENOENT)
{
if (missing_ok)
{
FIN_FILE_CRC32(use_crc32c, crc);
return crc;
}
}
elog(ERROR, "Cannot open file \"%s\": %s",
file_path, strerror(errno));
}
/* disable stdio buffering */
setvbuf(fp, NULL, _IONBF, BUFSIZ);
buf = pgut_malloc(STDIO_BUFSIZE);
/* calc CRC of file */
for (;;)
{
if (interrupted)
elog(ERROR, "interrupted during CRC calculation");
len = fread(buf, 1, STDIO_BUFSIZE, fp);
if (ferror(fp))
elog(ERROR, "Cannot read \"%s\": %s", file_path, strerror(errno));
/* update CRC */
COMP_FILE_CRC32(use_crc32c, crc, buf, len);
if (feof(fp))
break;
}
FIN_FILE_CRC32(use_crc32c, crc);
fclose(fp);
pg_free(buf);
return crc;
}
/*
* Read the local file to compute its CRC.
* We cannot make decision about file decompression because
* user may ask to backup already compressed files and we should be
* obvious about it.
*/
pg_crc32
pgFileGetCRCgz(const char *file_path, bool use_crc32c, bool missing_ok)
{
gzFile fp;
pg_crc32 crc = 0;
int len = 0;
int err;
char *buf;
INIT_FILE_CRC32(use_crc32c, crc);
/* open file in binary read mode */
fp = gzopen(file_path, PG_BINARY_R);
if (fp == NULL)
{
if (errno == ENOENT)
{
if (missing_ok)
{
FIN_FILE_CRC32(use_crc32c, crc);
return crc;
}
}
elog(ERROR, "Cannot open file \"%s\": %s",
file_path, strerror(errno));
}
buf = pgut_malloc(STDIO_BUFSIZE);
/* calc CRC of file */
for (;;)
{
if (interrupted)
elog(ERROR, "interrupted during CRC calculation");
len = gzread(fp, buf, STDIO_BUFSIZE);
if (len <= 0)
{
/* we either run into eof or error */
if (gzeof(fp))
break;
else
{
const char *err_str = NULL;
err_str = gzerror(fp, &err);
elog(ERROR, "Cannot read from compressed file %s", err_str);
}
}
/* update CRC */
COMP_FILE_CRC32(use_crc32c, crc, buf, len);
}
FIN_FILE_CRC32(use_crc32c, crc);
gzclose(fp);
pg_free(buf);
return crc;
}
void
pgFileFree(void *file)
{
pgFile *file_ptr;
if (file == NULL)
return;
file_ptr = (pgFile *) file;
pfree(file_ptr->linked);
pfree(file_ptr->rel_path);
pfree(file);
}
/* Compare two pgFile with their path in ascending order of ASCII code. */
int
pgFileMapComparePath(const void *f1, const void *f2)
{
page_map_entry *f1p = *(page_map_entry **)f1;
page_map_entry *f2p = *(page_map_entry **)f2;
return strcmp(f1p->path, f2p->path);
}
/* Compare two pgFile with their name in ascending order of ASCII code. */
int
pgFileCompareName(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
pgFile *f2p = *(pgFile **)f2;
return strcmp(f1p->name, f2p->name);
}
/* Compare pgFile->name with string in ascending order of ASCII code. */
int
pgFileCompareNameWithString(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
char *f2s = *(char **)f2;
return strcmp(f1p->name, f2s);
}
/* Compare pgFile->rel_path with string in ascending order of ASCII code. */
int
pgFileCompareRelPathWithString(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
char *f2s = *(char **)f2;
return strcmp(f1p->rel_path, f2s);
}
/*
* Compare two pgFile with their relative path and external_dir_num in ascending
* order of ASСII code.
*/
int
pgFileCompareRelPathWithExternal(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
pgFile *f2p = *(pgFile **)f2;
int res;
res = strcmp(f1p->rel_path, f2p->rel_path);
if (res == 0)
{
if (f1p->external_dir_num > f2p->external_dir_num)
return 1;
else if (f1p->external_dir_num < f2p->external_dir_num)
return -1;
else
return 0;
}
return res;
}
/*
* Compare two pgFile with their rel_path and external_dir_num
* in descending order of ASCII code.
*/
int
pgFileCompareRelPathWithExternalDesc(const void *f1, const void *f2)
{
return -pgFileCompareRelPathWithExternal(f1, f2);
}
/* Compare two pgFile with their linked directory path. */
int
pgFileCompareLinked(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
pgFile *f2p = *(pgFile **)f2;
return strcmp(f1p->linked, f2p->linked);
}
/* Compare two pgFile with their size */
int
pgFileCompareSize(const void *f1, const void *f2)
{
pgFile *f1p = *(pgFile **)f1;
pgFile *f2p = *(pgFile **)f2;
if (f1p->size > f2p->size)
return 1;
else if (f1p->size < f2p->size)
return -1;
else
return 0;
}
/* Compare two pgFile with their size in descending order */
int
pgFileCompareSizeDesc(const void *f1, const void *f2)
{
return -1 * pgFileCompareSize(f1, f2);
}
int
pgCompareString(const void *str1, const void *str2)
{
return strcmp(*(char **) str1, *(char **) str2);
}
/*
* From bsearch(3): "The compar routine is expected to have two argu‐
* ments which point to the key object and to an array member, in that order"
* But in practice this is opposite, so we took strlen from second string (search key)
* This is checked by tests.catchup.CatchupTest.test_catchup_with_exclude_path
*/
int
pgPrefixCompareString(const void *str1, const void *str2)
{
const char *s1 = *(char **) str1;
const char *s2 = *(char **) str2;
return strncmp(s1, s2, strlen(s2));
}
/* Compare two Oids */
int
pgCompareOid(const void *f1, const void *f2)
{
Oid *v1 = *(Oid **) f1;
Oid *v2 = *(Oid **) f2;
if (*v1 > *v2)
return 1;
else if (*v1 < *v2)
return -1;
else
return 0;}
void
db_map_entry_free(void *entry)
{
db_map_entry *m = (db_map_entry *) entry;
free(m->datname);
free(entry);
}
/*
* List files, symbolic links and directories in the directory "root" and add
* pgFile objects to "files". We add "root" to "files" if add_root is true.
*
* When follow_symlink is true, symbolic link is ignored and only file or
* directory linked to will be listed.
*
* TODO: make it strictly local
*/
void
dir_list_file(parray *files, const char *root, bool exclude, bool follow_symlink,
bool add_root, bool backup_logs, bool skip_hidden, int external_dir_num,
fio_location location)
{
pgFile *file;
file = pgFileNew(root, "", follow_symlink, external_dir_num, location);
if (file == NULL)
{
/* For external directory this is not ok */
if (external_dir_num > 0)
elog(ERROR, "External directory is not found: \"%s\"", root);
else
return;
}
if (!S_ISDIR(file->mode))
{
if (external_dir_num > 0)
elog(ERROR, " --external-dirs option \"%s\": directory or symbolic link expected",
root);
else
elog(WARNING, "Skip \"%s\": unexpected file format", root);
return;
}
if (add_root)
parray_append(files, file);
dir_list_file_internal(files, file, root, exclude, follow_symlink,
backup_logs, skip_hidden, external_dir_num, location);
if (!add_root)
pgFileFree(file);
}
#define CHECK_FALSE 0
#define CHECK_TRUE 1
#define CHECK_EXCLUDE_FALSE 2
/*
* Check file or directory.
*
* Check for exclude.
* Extract information about the file parsing its name.
* Skip files:
* - skip temp tables files
* - skip unlogged tables files
* Skip recursive tablespace content
* Set flags for:
* - database directories
* - datafiles
*/
static char
dir_check_file(pgFile *file, bool backup_logs)
{
int i;
int sscanf_res;
bool in_tablespace = false;
in_tablespace = path_is_prefix_of_path(PG_TBLSPC_DIR, file->rel_path);
/* Check if we need to exclude file by name */
if (S_ISREG(file->mode))
{
if (!exclusive_backup)
{
for (i = 0; pgdata_exclude_files_non_exclusive[i]; i++)
if (strcmp(file->rel_path,
pgdata_exclude_files_non_exclusive[i]) == 0)
{
/* Skip */
elog(LOG, "Excluding file: %s", file->name);
return CHECK_FALSE;
}
}
for (i = 0; pgdata_exclude_files[i]; i++)
if (strcmp(file->rel_path, pgdata_exclude_files[i]) == 0)
{
/* Skip */
elog(LOG, "Excluding file: %s", file->name);
return CHECK_FALSE;
}
}
/*
* If the directory name is in the exclude list, do not list the
* contents.
*/
else if (S_ISDIR(file->mode) && !in_tablespace && file->external_dir_num == 0)
{
/*
* If the item in the exclude list starts with '/', compare to
* the absolute path of the directory. Otherwise compare to the
* directory name portion.
*/
for (i = 0; pgdata_exclude_dir[i]; i++)
{
/* exclude by dirname */
if (strcmp(file->name, pgdata_exclude_dir[i]) == 0)
{
elog(LOG, "Excluding directory content: %s", file->rel_path);
return CHECK_EXCLUDE_FALSE;
}
}
if (!backup_logs)
{
if (strcmp(file->rel_path, PG_LOG_DIR) == 0)
{
/* Skip */
elog(LOG, "Excluding directory content: %s", file->rel_path);
return CHECK_EXCLUDE_FALSE;
}
}
}
/*
* Do not copy tablespaces twice. It may happen if the tablespace is located
* inside the PGDATA.
*/
if (S_ISDIR(file->mode) &&
strcmp(file->name, TABLESPACE_VERSION_DIRECTORY) == 0)
{
Oid tblspcOid;
char tmp_rel_path[MAXPGPATH];
/*
* Valid path for the tablespace is
* pg_tblspc/tblsOid/TABLESPACE_VERSION_DIRECTORY
*/
if (!path_is_prefix_of_path(PG_TBLSPC_DIR, file->rel_path))
return CHECK_FALSE;
sscanf_res = sscanf(file->rel_path, PG_TBLSPC_DIR "/%u/%s",
&tblspcOid, tmp_rel_path);
if (sscanf_res == 0)
return CHECK_FALSE;
}
if (in_tablespace)
{
char tmp_rel_path[MAXPGPATH];
sscanf_res = sscanf(file->rel_path, PG_TBLSPC_DIR "/%u/%[^/]/%u/",
&(file->tblspcOid), tmp_rel_path,
&(file->dbOid));
/*
* We should skip other files and directories rather than
* TABLESPACE_VERSION_DIRECTORY, if this is recursive tablespace.
*/
if (sscanf_res == 2 && strcmp(tmp_rel_path, TABLESPACE_VERSION_DIRECTORY) != 0)
return CHECK_FALSE;
}
else if (path_is_prefix_of_path("global", file->rel_path))
{
file->tblspcOid = GLOBALTABLESPACE_OID;
}
else if (path_is_prefix_of_path("base", file->rel_path))
{
file->tblspcOid = DEFAULTTABLESPACE_OID;
sscanf(file->rel_path, "base/%u/", &(file->dbOid));
}
/* Do not backup ptrack_init files */
if (S_ISREG(file->mode) && strcmp(file->name, "ptrack_init") == 0)
return CHECK_FALSE;
/*
* Check files located inside database directories including directory
* 'global'
*/
if (S_ISREG(file->mode) && file->tblspcOid != 0 &&
file->name && file->name[0])
{
if (strcmp(file->name, "pg_internal.init") == 0)
return CHECK_FALSE;
/* Do not backup ptrack2.x temp map files */
// else if (strcmp(file->name, "ptrack.map") == 0)
// return CHECK_FALSE;
else if (strcmp(file->name, "ptrack.map.mmap") == 0)
return CHECK_FALSE;
else if (strcmp(file->name, "ptrack.map.tmp") == 0)
return CHECK_FALSE;
/* Do not backup temp files */
else if (file->name[0] == 't' && isdigit(file->name[1]))
return CHECK_FALSE;
else if (isdigit(file->name[0]))
{
char *fork_name;
int len;
char suffix[MAXPGPATH];
fork_name = strstr(file->name, "_");
if (fork_name)
{
/* Auxiliary fork of the relfile */
if (strcmp(fork_name, "_vm") == 0)
file->forkName = vm;
else if (strcmp(fork_name, "_fsm") == 0)
file->forkName = fsm;
else if (strcmp(fork_name, "_cfm") == 0)
file->forkName = cfm;
else if (strcmp(fork_name, "_ptrack") == 0)
file->forkName = ptrack;
else if (strcmp(fork_name, "_init") == 0)
file->forkName = init;
// extract relOid for certain forks
if (file->forkName == vm ||
file->forkName == fsm ||
file->forkName == init ||
file->forkName == cfm)
{
// sanity
if (sscanf(file->name, "%u_*", &(file->relOid)) != 1)
file->relOid = 0;
}
/* Do not backup ptrack files */
if (file->forkName == ptrack)
return CHECK_FALSE;
}
else
{
len = strlen(file->name);
/* reloid.cfm */
if (len > 3 && strcmp(file->name + len - 3, "cfm") == 0)
return CHECK_TRUE;
sscanf_res = sscanf(file->name, "%u.%d.%s", &(file->relOid),
&(file->segno), suffix);
if (sscanf_res == 0)
elog(ERROR, "Cannot parse file name \"%s\"", file->name);
else if (sscanf_res == 1 || sscanf_res == 2)
file->is_datafile = true;
}
}
}
return CHECK_TRUE;
}
/*
* List files in parent->path directory. If "exclude" is true do not add into
* "files" files from pgdata_exclude_files and directories from
* pgdata_exclude_dir.
*
* TODO: should we check for interrupt here ?
*/
static void
dir_list_file_internal(parray *files, pgFile *parent, const char *parent_dir,
bool exclude, bool follow_symlink, bool backup_logs,
bool skip_hidden, int external_dir_num, fio_location location)
{
DIR *dir;
struct dirent *dent;
if (!S_ISDIR(parent->mode))
elog(ERROR, "\"%s\" is not a directory", parent_dir);
/* Open directory and list contents */
dir = fio_opendir(parent_dir, location);
if (dir == NULL)
{
if (errno == ENOENT)
{
/* Maybe the directory was removed */
return;
}
elog(ERROR, "Cannot open directory \"%s\": %s",
parent_dir, strerror(errno));
}
errno = 0;
while ((dent = fio_readdir(dir)))
{
pgFile *file;
char child[MAXPGPATH];
char rel_child[MAXPGPATH];
char check_res;
join_path_components(child, parent_dir, dent->d_name);
join_path_components(rel_child, parent->rel_path, dent->d_name);
file = pgFileNew(child, rel_child, follow_symlink, external_dir_num,
location);
if (file == NULL)
continue;
/* Skip entries point current dir or parent dir */
if (S_ISDIR(file->mode) &&
(strcmp(dent->d_name, ".") == 0 || strcmp(dent->d_name, "..") == 0))
{
pgFileFree(file);
continue;
}
/* skip hidden files and directories */
if (skip_hidden && file->name[0] == '.')
{
elog(WARNING, "Skip hidden file: '%s'", child);
pgFileFree(file);
continue;
}
/*
* Add only files, directories and links. Skip sockets and other
* unexpected file formats.
*/
if (!S_ISDIR(file->mode) && !S_ISREG(file->mode))
{
elog(WARNING, "Skip '%s': unexpected file format", child);
pgFileFree(file);
continue;
}
if (exclude)
{
check_res = dir_check_file(file, backup_logs);
if (check_res == CHECK_FALSE)
{
/* Skip */
pgFileFree(file);
continue;
}
else if (check_res == CHECK_EXCLUDE_FALSE)
{
/* We add the directory itself which content was excluded */
parray_append(files, file);
continue;
}
}
parray_append(files, file);
/*
* If the entry is a directory call dir_list_file_internal()
* recursively.
*/
if (S_ISDIR(file->mode))
dir_list_file_internal(files, file, child, exclude, follow_symlink,
backup_logs, skip_hidden, external_dir_num, location);
}
if (errno && errno != ENOENT)
{
int errno_tmp = errno;
fio_closedir(dir);
elog(ERROR, "Cannot read directory \"%s\": %s",
parent_dir, strerror(errno_tmp));
}
fio_closedir(dir);
}
/*
* Retrieve tablespace path, either relocated or original depending on whether
* -T was passed or not.
*
* Copy of function get_tablespace_mapping() from pg_basebackup.c.
*/
const char *
get_tablespace_mapping(const char *dir)
{
TablespaceListCell *cell;
for (cell = tablespace_dirs.head; cell; cell = cell->next)
if (strcmp(dir, cell->old_dir) == 0)
return cell->new_dir;
return dir;
}
/*
* Split argument into old_dir and new_dir and append to mapping
* list.
*
* Copy of function tablespace_list_append() from pg_basebackup.c.
*/
static void
opt_path_map(ConfigOption *opt, const char *arg, TablespaceList *list,
const char *type)
{
TablespaceListCell *cell = pgut_new(TablespaceListCell);
char *dst;
char *dst_ptr;
const char *arg_ptr;
memset(cell, 0, sizeof(TablespaceListCell));
dst_ptr = dst = cell->old_dir;
for (arg_ptr = arg; *arg_ptr; arg_ptr++)
{
if (dst_ptr - dst >= MAXPGPATH)
elog(ERROR, "directory name too long");
if (*arg_ptr == '\\' && *(arg_ptr + 1) == '=')
; /* skip backslash escaping = */
else if (*arg_ptr == '=' && (arg_ptr == arg || *(arg_ptr - 1) != '\\'))
{
if (*cell->new_dir)
elog(ERROR, "multiple \"=\" signs in %s mapping\n", type);
else
dst = dst_ptr = cell->new_dir;
}
else
*dst_ptr++ = *arg_ptr;
}
if (!*cell->old_dir || !*cell->new_dir)
elog(ERROR, "invalid %s mapping format \"%s\", "
"must be \"OLDDIR=NEWDIR\"", type, arg);
canonicalize_path(cell->old_dir);
canonicalize_path(cell->new_dir);
/*
* This check isn't absolutely necessary. But all tablespaces are created
* with absolute directories, so specifying a non-absolute path here would
* just never match, possibly confusing users. It's also good to be
* consistent with the new_dir check.
*/
if (!is_absolute_path(cell->old_dir))
elog(ERROR, "old directory is not an absolute path in %s mapping: %s\n",
type, cell->old_dir);