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https://git.postgresql.org/git/postgresql.git
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272 lines
6.3 KiB
C
272 lines
6.3 KiB
C
/*
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* exec.c
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*
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* execution functions
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*
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* Copyright (c) 2010-2011, PostgreSQL Global Development Group
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* contrib/pg_upgrade/exec.c
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*/
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#include "postgres.h"
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#include "pg_upgrade.h"
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#include <fcntl.h>
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#include <unistd.h>
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static void check_data_dir(const char *pg_data);
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static void check_bin_dir(ClusterInfo *cluster);
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static void validate_exec(const char *dir, const char *cmdName);
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#ifdef WIN32
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static int win32_check_directory_write_permissions(void);
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#endif
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/*
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* exec_prog()
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*
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* Formats a command from the given argument list and executes that
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* command. If the command executes, exec_prog() returns 1 otherwise
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* exec_prog() logs an error message and returns 0.
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*
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* If throw_error is TRUE, this function will throw a PG_FATAL error
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* instead of returning should an error occur.
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*/
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int
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exec_prog(bool throw_error, const char *fmt,...)
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{
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va_list args;
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int result;
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char cmd[MAXPGPATH];
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va_start(args, fmt);
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vsnprintf(cmd, MAXPGPATH, fmt, args);
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va_end(args);
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pg_log(PG_INFO, "%s\n", cmd);
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result = system(cmd);
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if (result != 0)
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{
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pg_log(throw_error ? PG_FATAL : PG_INFO,
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"There were problems executing \"%s\"\n", cmd);
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return 1;
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}
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return 0;
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}
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/*
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* is_server_running()
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*
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* checks whether postmaster on the given data directory is running or not.
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* The check is performed by looking for the existence of postmaster.pid file.
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*/
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bool
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is_server_running(const char *datadir)
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{
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char path[MAXPGPATH];
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int fd;
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snprintf(path, sizeof(path), "%s/postmaster.pid", datadir);
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if ((fd = open(path, O_RDONLY, 0)) < 0)
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{
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/* ENOTDIR means we will throw a more useful error later */
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if (errno != ENOENT && errno != ENOTDIR)
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pg_log(PG_FATAL, "could not open file \"%s\" for reading: %s\n",
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path, getErrorText(errno));
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return false;
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}
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close(fd);
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return true;
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}
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/*
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* verify_directories()
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*
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* does all the hectic work of verifying directories and executables
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* of old and new server.
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*
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* NOTE: May update the values of all parameters
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*/
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void
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verify_directories(void)
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{
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prep_status("Checking current, bin, and data directories");
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#ifndef WIN32
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if (access(".", R_OK | W_OK | X_OK) != 0)
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#else
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if (win32_check_directory_write_permissions() != 0)
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#endif
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pg_log(PG_FATAL,
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"You must have read and write access in the current directory.\n");
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check_bin_dir(&old_cluster);
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check_data_dir(old_cluster.pgdata);
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check_bin_dir(&new_cluster);
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check_data_dir(new_cluster.pgdata);
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check_ok();
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}
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#ifdef WIN32
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/*
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* win32_check_directory_write_permissions()
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*
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* access() on WIN32 can't check directory permissions, so we have to
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* optionally create, then delete a file to check.
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* http://msdn.microsoft.com/en-us/library/1w06ktdy%28v=vs.80%29.aspx
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*/
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static int
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win32_check_directory_write_permissions(void)
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{
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int fd;
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/*
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* We open a file we would normally create anyway. We do this even in
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* 'check' mode, which isn't ideal, but this is the best we can do.
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*/
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if ((fd = open(GLOBALS_DUMP_FILE, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR)) < 0)
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return -1;
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close(fd);
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return unlink(GLOBALS_DUMP_FILE);
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}
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#endif
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/*
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* check_data_dir()
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*
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* This function validates the given cluster directory - we search for a
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* small set of subdirectories that we expect to find in a valid $PGDATA
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* directory. If any of the subdirectories are missing (or secured against
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* us) we display an error message and exit()
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*
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*/
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static void
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check_data_dir(const char *pg_data)
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{
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char subDirName[MAXPGPATH];
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int subdirnum;
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/* start check with top-most directory */
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const char *requiredSubdirs[] = {"", "base", "global", "pg_clog",
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"pg_multixact", "pg_subtrans", "pg_tblspc", "pg_twophase",
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"pg_xlog"};
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for (subdirnum = 0;
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subdirnum < sizeof(requiredSubdirs) / sizeof(requiredSubdirs[0]);
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++subdirnum)
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{
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struct stat statBuf;
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snprintf(subDirName, sizeof(subDirName), "%s%s%s", pg_data,
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/* Win32 can't stat() a directory with a trailing slash. */
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*requiredSubdirs[subdirnum] ? "/" : "",
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requiredSubdirs[subdirnum]);
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if (stat(subDirName, &statBuf) != 0)
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report_status(PG_FATAL, "check for \"%s\" failed: %s\n",
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subDirName, getErrorText(errno));
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else if (!S_ISDIR(statBuf.st_mode))
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report_status(PG_FATAL, "%s is not a directory\n",
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subDirName);
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}
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}
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/*
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* check_bin_dir()
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*
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* This function searches for the executables that we expect to find
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* in the binaries directory. If we find that a required executable
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* is missing (or secured against us), we display an error message and
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* exit().
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*/
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static void
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check_bin_dir(ClusterInfo *cluster)
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{
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struct stat statBuf;
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/* check bindir */
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if (stat(cluster->bindir, &statBuf) != 0)
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report_status(PG_FATAL, "check for \"%s\" failed: %s\n",
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cluster->bindir, getErrorText(errno));
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else if (!S_ISDIR(statBuf.st_mode))
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report_status(PG_FATAL, "%s is not a directory\n",
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cluster->bindir);
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validate_exec(cluster->bindir, "postgres");
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validate_exec(cluster->bindir, "pg_ctl");
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validate_exec(cluster->bindir, "pg_resetxlog");
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if (cluster == &new_cluster)
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{
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/* these are only needed in the new cluster */
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validate_exec(cluster->bindir, "pg_config");
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validate_exec(cluster->bindir, "psql");
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validate_exec(cluster->bindir, "pg_dumpall");
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}
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}
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/*
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* validate_exec()
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*
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* validate "path" as an executable file
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*/
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static void
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validate_exec(const char *dir, const char *cmdName)
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{
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char path[MAXPGPATH];
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struct stat buf;
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snprintf(path, sizeof(path), "%s/%s", dir, cmdName);
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#ifdef WIN32
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/* Windows requires a .exe suffix for stat() */
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if (strlen(path) <= strlen(EXE_EXT) ||
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pg_strcasecmp(path + strlen(path) - strlen(EXE_EXT), EXE_EXT) != 0)
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strlcat(path, EXE_EXT, sizeof(path));
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#endif
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/*
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* Ensure that the file exists and is a regular file.
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*/
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if (stat(path, &buf) < 0)
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pg_log(PG_FATAL, "check for \"%s\" failed: %s\n",
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path, getErrorText(errno));
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else if (!S_ISREG(buf.st_mode))
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pg_log(PG_FATAL, "check for \"%s\" failed: not an executable file\n",
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path);
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/*
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* Ensure that the file is both executable and readable (required for
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* dynamic loading).
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*/
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#ifndef WIN32
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if (access(path, R_OK) != 0)
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#else
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if ((buf.st_mode & S_IRUSR) == 0)
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#endif
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pg_log(PG_FATAL, "check for \"%s\" failed: cannot read file (permission denied)\n",
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path);
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#ifndef WIN32
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if (access(path, X_OK) != 0)
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#else
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if ((buf.st_mode & S_IXUSR) == 0)
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#endif
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pg_log(PG_FATAL, "check for \"%s\" failed: cannot execute (permission denied)\n",
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path);
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}
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