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Add sanity checks to be sure pg_rewind can be used before executing a switchover

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This commit is contained in:
Ian Barwick
2016-01-28 07:50:39 +09:00
committed by Ian Barwick
parent 16c1e13019
commit ca6cbcf965
3 changed files with 85 additions and 5 deletions
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31
dbutils.c
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@@ -26,6 +26,8 @@
#include "strutil.h"
#include "log.h"
#include "catalog/pg_control.h"
char repmgr_schema[MAXLEN] = "";
char repmgr_schema_quoted[MAXLEN] = "";
@@ -1709,3 +1711,32 @@ parse_node_type(const char *type)
return UNKNOWN;
}
int
get_data_checksum_version(const char *data_directory)
{
ControlFileData control_file;
int fd;
char control_file_path[MAXPGPATH];
snprintf(control_file_path, MAXPGPATH, "%s/global/pg_control", data_directory);
if ((fd = open(control_file_path, O_RDONLY | PG_BINARY, 0)) == -1)
{
log_err(_("Unable to open control file \"%s\" for reading: %s\n"),
control_file_path, strerror(errno));
return -1;
}
if (read(fd, &control_file, sizeof(ControlFileData)) != sizeof(ControlFileData))
{
log_err(_("could not read file \"%s\": %s\n"),
control_file_path, strerror(errno));
close(fd);
return -1;
}
close(fd);
return (int)control_file.data_checksum_version;
}