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/*
** 2014 August 30
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This file contains a command-line application that uses the RBU
** extension. See the usage() function below for an explanation.
*/
#include "sqlite3rbu.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/*
** Print a usage message and exit.
*/
void usage(const char *zArgv0){
fprintf(stderr,
"Usage: %s [-step NSTEP] TARGET-DB RBU-DB\n"
"\n"
" Argument RBU-DB must be an RBU database containing an update suitable for\n"
" target database TARGET-DB. If NSTEP is set to less than or equal to zero\n"
" (the default value), this program attempts to apply the entire update to\n"
" the target database.\n"
"\n"
" If NSTEP is greater than zero, then a maximum of NSTEP calls are made\n"
" to sqlite3rbu_step(). If the RBU update has not been completely applied\n"
" after the NSTEP'th call is made, the state is saved in the database RBU-DB\n"
" and the program exits. Subsequent invocations of this (or any other RBU)\n"
" application will use this state to resume applying the RBU update to the\n"
" target db.\n"
"\n"
, zArgv0);
exit(1);
}
void report_default_vfs(){
sqlite3_vfs *pVfs = sqlite3_vfs_find(0);
fprintf(stdout, "default vfs is \"%s\"\n", pVfs->zName);
}
void report_rbu_vfs(sqlite3rbu *pRbu){
sqlite3 *db = sqlite3rbu_db(pRbu, 0);
if( db ){
char *zName = 0;
sqlite3_file_control(db, "main", SQLITE_FCNTL_VFSNAME, &zName);
if( zName ){
fprintf(stdout, "using vfs \"%s\"\n", zName);
}else{
fprintf(stdout, "vfs name not available\n");
}
sqlite3_free(zName);
}
}
int main(int argc, char **argv){
int i;
const char *zTarget; /* Target database to apply RBU to */
const char *zRbu; /* Database containing RBU */
char zBuf[200]; /* Buffer for printf() */
char *zErrmsg; /* Error message, if any */
sqlite3rbu *pRbu; /* RBU handle */
int nStep = 0; /* Maximum number of step() calls */
int rc;
sqlite3_int64 nProgress = 0;
/* Process command line arguments. Following this block local variables
** zTarget, zRbu and nStep are all set. */
if( argc==5 ){
int nArg1 = strlen(argv[1]);
if( nArg1>5 || nArg1<2 || memcmp("-step", argv[1], nArg1) ) usage(argv[0]);
nStep = atoi(argv[2]);
}else if( argc!=3 ){
usage(argv[0]);
}
zTarget = argv[argc-2];
zRbu = argv[argc-1];
report_default_vfs();
/* Open an RBU handle. If nStep is less than or equal to zero, call
** sqlite3rbu_step() until either the RBU has been completely applied
** or an error occurs. Or, if nStep is greater than zero, call
** sqlite3rbu_step() a maximum of nStep times. */
pRbu = sqlite3rbu_open(zTarget, zRbu, 0);
report_rbu_vfs(pRbu);
for(i=0; (nStep<=0 || i<nStep) && sqlite3rbu_step(pRbu)==SQLITE_OK; i++);
nProgress = sqlite3rbu_progress(pRbu);
rc = sqlite3rbu_close(pRbu, &zErrmsg);
/* Let the user know what happened. */
switch( rc ){
case SQLITE_OK:
sqlite3_snprintf(sizeof(zBuf), zBuf,
"SQLITE_OK: rbu update incomplete (%lld operations so far)\n",
nProgress
);
fprintf(stdout, zBuf);
break;
case SQLITE_DONE:
sqlite3_snprintf(sizeof(zBuf), zBuf,
"SQLITE_DONE: rbu update completed (%lld operations)\n",
nProgress
);
fprintf(stdout, zBuf);
break;
default:
fprintf(stderr, "error=%d: %s\n", rc, zErrmsg);
break;
}
sqlite3_free(zErrmsg);
return (rc==SQLITE_OK || rc==SQLITE_DONE) ? 0 : 1;
}
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