A simple directory cloner
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/*
* backly - A simple directory cloner
* Copyright (C) 2015 L. Bradley LaBoon <me@bradleylaboon.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
void printUsage(FILE *stream)
{
fprintf(stream, "Usage: backly [options] <srcdir> <destdir>\n");
}
void printHelp()
{
printUsage(stdout);
printf("Turn destdir into a clone of srcdir.\n\n");
printf("Options:\n");
printf(" --test\t\tRun in test mode\n");
printf(" --noremove\tDon't remove any files in destdir\n");
printf(" --help\t\tPrint this help and quit\n\n");
printf("Report bugs to L. Bradley LaBoon <me@bradleylaboon.com>\n");
printf("backly home page: <http://git.bradleylaboon.com/backly.git>\n");
}
void removeMissing(char *src, int srcPrefix, char *dest, int destPrefix, int testMode)
{
int srcLen = 0, destLen = 0;
while (src[srcLen])
srcLen++;
while (dest[destLen])
destLen++;
DIR *destDir = opendir(dest);
if (destDir == NULL) {
fprintf(stderr, "Could not open %s: %s\n", dest, strerror(errno));
return;
}
// If the entire directory doesn't exist in src, remove it from dest
DIR *srcDir = opendir(src);
if (srcDir == NULL) {
if (errno == ENOENT) {
printf("- %s", dest + destPrefix);
fflush(stdout);
if (testMode == 0) {
int pid = fork();
if (pid == -1) {
fprintf(stderr, "Could not fork: %s\n", strerror(errno));
closedir(destDir);
return;
} else if (pid == 0) {
execlp("rm", "rm", "-rf", dest, (char *) NULL);
} else {
wait(NULL);
}
}
printf("\n");
closedir(destDir);
return;
} else {
fprintf(stderr, "Could not open %s: %s\n", src, strerror(errno));
closedir(destDir);
return;
}
}
closedir(srcDir);
// Look at each item in the folder
struct dirent *item;
while ((item = readdir(destDir)) != NULL) {
// Ignore . and .. references
if (strcmp(item->d_name, ".") == 0 || strcmp(item->d_name, "..") == 0)
continue;
int itemLen = 0;
while (item->d_name[itemLen])
itemLen++;
// +2 because a trailing slash might be added
char itemSrc[srcLen + itemLen + 2];
char itemDest[destLen + itemLen + 2];
sprintf(itemSrc, "%s%s", src, item->d_name);
sprintf(itemDest, "%s%s", dest, item->d_name);
// Test if item is a directory
int itemIsDir = 1;
DIR *testDir = opendir(itemDest);
if (testDir == NULL && errno == ENOTDIR)
itemIsDir = 0;
else if (testDir != NULL)
closedir(testDir);
if (itemIsDir == 1) {
// If it's a directory, append trailing slashes and recurse
itemSrc[srcLen + itemLen] = '/';
itemSrc[srcLen + itemLen + 1] = '\0';
itemDest[destLen + itemLen] = '/';
itemDest[destLen + itemLen + 1] = '\0';
removeMissing(itemSrc, srcPrefix, itemDest, destPrefix, testMode);
} else {
// If the file doesn't exist in src, remove it from dest
FILE *srcFile = fopen(itemSrc, "r");
if (srcFile == NULL) {
if (errno == ENOENT) {
printf("- %s", itemDest + destPrefix);
fflush(stdout);
if (testMode == 0) {
int pid = fork();
if (pid == -1) {
fprintf(stderr, "Could not fork: %s\n", strerror(errno));
continue;
} else if (pid == 0) {
execlp("rm", "rm", "-f", itemDest, (char *) NULL);
} else {
wait(NULL);
}
}
printf("\n");
continue;
} else {
fprintf(stderr, "Could not open %s: %s\n", itemSrc, strerror(errno));
continue;
}
} else {
fclose(srcFile);
}
}
}
closedir(destDir);
return;
}
void copyNew(char *src, int srcPrefix, char *dest, int destPrefix, int testMode)
{
int srcLen = 0, destLen = 0;
while (src[srcLen])
srcLen++;
while(dest[destLen])
destLen++;
DIR *srcDir = opendir(src);
if (srcDir == NULL) {
fprintf(stderr, "Could not open %s: %s\n", src, strerror(errno));
return;
}
// If the dest directory doesn't exist, create it
DIR *destDir = opendir(dest);
if (destDir == NULL) {
if (errno == ENOENT) {
printf("+ %s", dest + destPrefix);
fflush(stdout);
if (testMode == 0) {
int pid = fork();
if (pid == -1) {
fprintf(stderr, "Could not fork: %s:\n", strerror(errno));
closedir(srcDir);
return;
} else if (pid == 0) {
execlp("mkdir", "mkdir", dest, (char *) NULL);
} else {
wait(NULL);
}
}
printf("\n");
} else {
fprintf(stderr, "Could not open %s: %s\n", dest, strerror(errno));
closedir(srcDir);
return;
}
}
closedir(destDir);
// Look at each item in the folder
struct dirent *item;
while ((item = readdir(srcDir)) != NULL) {
if (strcmp(item->d_name, ".") == 0 || strcmp(item->d_name, "..") == 0)
continue;
int itemLen = 0;
while (item->d_name[itemLen])
itemLen++;
char itemSrc[srcLen + itemLen + 2];
char itemDest[destLen + itemLen + 2];
sprintf(itemSrc, "%s%s", src, item->d_name);
sprintf(itemDest, "%s%s", dest, item->d_name);
// Test if item is a directory
int itemIsDir = 1;
DIR *testDir = opendir(itemSrc);
if (testDir == NULL && errno == ENOTDIR)
itemIsDir = 0;
else if (testDir != NULL)
closedir(testDir);
if (itemIsDir == 1) {
// If it's a directory, recurse
itemSrc[srcLen + itemLen] = '/';
itemSrc[srcLen + itemLen + 1] = '\0';
itemDest[destLen + itemLen] = '/';
itemDest[destLen + itemLen + 1] = '\0';
copyNew(itemSrc, srcPrefix, itemDest, destPrefix, testMode);
} else {
// Check if file exists in dest
int needToCopy = 0;
FILE *destFile = fopen(itemDest, "r");
if (destFile == NULL) {
if (errno == ENOENT) {
needToCopy = 1;
} else {
fprintf(stderr, "Could not open %s: %s\n", itemDest, strerror(errno));
continue;
}
} else {
fclose(destFile);
// Check if file size or modified time is different
struct stat srcStat, destStat;
if (stat(itemSrc, &srcStat) == -1) {
fprintf(stderr, "Could not stat %s\n", itemSrc);
continue;
}
if (stat(itemDest, &destStat) == -1) {
fprintf(stderr, "Could not stat %s\n", itemDest);
continue;
}
if (srcStat.st_size != destStat.st_size)
needToCopy = 1;
else if (srcStat.st_mtime > destStat.st_mtime)
needToCopy = 1;
}
// Only copy file if it doesn't exist or has changed
if (needToCopy == 1) {
printf("+ %s ", itemSrc + srcPrefix);
fflush(stdout);
if (testMode == 0) {
int pid = fork();
if (pid == -1) {
fprintf(stderr, "Could not fork: %s\n", strerror(errno));
continue;
} else if (pid == 0) {
execlp("cp", "cp", "-f", "-P", "--preserve=timestamps,links", itemSrc, itemDest, (char *) NULL);
} else {
struct stat srcStat, destStat;
double pDone = 0;
int numPrinted = 0;
if (stat(itemSrc, &srcStat) != -1) {
while (waitpid(pid, NULL, WNOHANG) == 0) {
if (stat(itemDest, &destStat) == -1)
continue;
pDone = (double)destStat.st_size / (double)srcStat.st_size;
for (int i = 0; i < numPrinted; i++)
printf("\b \b");
numPrinted = printf("%.2lf%%", pDone * 100);
fflush(stdout);
usleep(50000);
}
}
for (int i = 0; i < numPrinted; i++)
printf("\b \b");
printf("100.00%%");
fflush(stdout);
}
}
printf("\n");
}
}
}
closedir(srcDir);
return;
}
int main(int argc, char **argv)
{
int srcArg = 0, destArg = 0;
int testMode = 0, remove = 1;
// Parse arguments
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--help") == 0) {
printHelp();
exit(0);
} else if (strcmp(argv[i], "--test") == 0) {
testMode = 1;
printf("***Operating in test mode.***\n");
} else if (strcmp(argv[i], "--noremove") == 0) {
remove = 0;
} else if (srcArg == 0) {
srcArg = i;
} else {
destArg = i;
}
}
if (srcArg == 0 || destArg == 0) {
printUsage(stderr);
fprintf(stderr, "Run 'backly --help' for more information.\n");
exit(1);
}
// Determine argument lengths
int srcLen = 0, destLen = 0;
while (argv[srcArg][srcLen])
srcLen++;
while (argv[destArg][destLen])
destLen++;
// Add trailing slashes to directory arguments if necessary
char srcDir[srcLen + 2], destDir[destLen + 2];
if (argv[srcArg][srcLen - 1] == '/')
sprintf(srcDir, "%s", argv[srcArg]);
else
sprintf(srcDir, "%s/", argv[srcArg]);
if (argv[destArg][destLen - 1] == '/')
sprintf(destDir, "%s", argv[destArg]);
else
sprintf(destDir, "%s/", argv[destArg]);
// Check if directories exist and can be accessed
DIR *dir = opendir(srcDir);
if (dir == NULL) {
fprintf(stderr, "Could not open source: %s\n", strerror(errno));
exit(1);
}
closedir(dir);
dir = opendir(destDir);
if (dir == NULL) {
fprintf(stderr, "Could not open destination: %s\n", strerror(errno));
exit(1);
}
closedir(dir);
// Remove files from the destination that don't exist in the source
if (remove)
removeMissing(srcDir, strlen(srcDir), destDir, strlen(destDir), testMode);
// Copy new files and overwrite existing files if different
copyNew(srcDir, strlen(srcDir), destDir, strlen(destDir), testMode);
return 0;
}