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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-05-04 12:17:33 +0000 |
commit | 5e45211a64149b3c659b90ff2de6fa982a5a93ed (patch) | |
tree | 739caf8c461053357daa9f162bef34516c7bf452 /src/port/pgcheckdir.c | |
parent | Initial commit. (diff) | |
download | postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.tar.xz postgresql-15-5e45211a64149b3c659b90ff2de6fa982a5a93ed.zip |
Adding upstream version 15.5.upstream/15.5
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/port/pgcheckdir.c')
-rw-r--r-- | src/port/pgcheckdir.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/port/pgcheckdir.c b/src/port/pgcheckdir.c new file mode 100644 index 0000000..6c09cf2 --- /dev/null +++ b/src/port/pgcheckdir.c @@ -0,0 +1,92 @@ +/*------------------------------------------------------------------------- + * + * pgcheckdir.c + * + * A simple subroutine to check whether a directory exists and is empty or not. + * Useful in both initdb and the backend. + * + * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * IDENTIFICATION + * src/port/pgcheckdir.c + *------------------------------------------------------------------------- + */ + +#include "c.h" + +#include <dirent.h> + + +/* + * Test to see if a directory exists and is empty or not. + * + * Returns: + * 0 if nonexistent + * 1 if exists and empty + * 2 if exists and contains _only_ dot files + * 3 if exists and contains a mount point + * 4 if exists and not empty + * -1 if trouble accessing directory (errno reflects the error) + */ +int +pg_check_dir(const char *dir) +{ + int result = 1; + DIR *chkdir; + struct dirent *file; + bool dot_found = false; + bool mount_found = false; + int readdir_errno; + + chkdir = opendir(dir); + if (chkdir == NULL) + return (errno == ENOENT) ? 0 : -1; + + while (errno = 0, (file = readdir(chkdir)) != NULL) + { + if (strcmp(".", file->d_name) == 0 || + strcmp("..", file->d_name) == 0) + { + /* skip this and parent directory */ + continue; + } +#ifndef WIN32 + /* file starts with "." */ + else if (file->d_name[0] == '.') + { + dot_found = true; + } + /* lost+found directory */ + else if (strcmp("lost+found", file->d_name) == 0) + { + mount_found = true; + } +#endif + else + { + result = 4; /* not empty */ + break; + } + } + + if (errno) + result = -1; /* some kind of I/O error? */ + + /* Close chkdir and avoid overwriting the readdir errno on success */ + readdir_errno = errno; + if (closedir(chkdir)) + result = -1; /* error executing closedir */ + else + errno = readdir_errno; + + /* We report on mount point if we find a lost+found directory */ + if (result == 1 && mount_found) + result = 3; + + /* We report on dot-files if we _only_ find dot files */ + if (result == 1 && dot_found) + result = 2; + + return result; +} |