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#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <ftw.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#define VCX_DIR ".vcx"
#define HEAD VCX_DIR "/head"
#define TMP_DIR VCX_DIR "/tmp"
#define OBJ_DIR VCX_DIR "/obj"
#define EXCLUDE_PATHS ".vcxignore"
#define MAX_DEPTH 256
#define MALLOC(s) _xmalloc((s), __FILE__, __LINE__)
#define REALLOC(p, s) _xrealloc((p), (s), __FILE__, __LINE__)
static inline void init(int argc, char *argv[]);
static inline void status(int argc, char *argv[]);
static inline int cmp_links(const char *link1, const char *link2);
static inline int cmp_content(const char *file1, const char *file2);
static inline char *concat_path(const char *dir, const char *file);
static inline int scan_head(const char * path, const struct stat *st, int flag, struct FTW *ftwbuf);
static inline int scan_tree(const char * path, const struct stat *st, int flag, struct FTW *ftwbuf);
static inline void *_xmalloc(size_t s, const char *file, int line);
static inline void *_xrealloc(void *ptr, size_t s, const char *file, int line);
struct command {
char *name;
void (*func)(int argc, char *argv[]);
};
struct command cmd[] = {
{"init", init}, {"status", status}, {NULL, NULL}
};
int main(int argc, char *argv[])
{
if (argc < 2)
errx(1, "Usage: %s <command> [<args>]", argv[0]);
for (int i = 0; cmd[i].name != NULL; i++) {
if (strcmp(argv[1], cmd[i].name) == 0) {
cmd[i].func(argc - 1, argv + 1);
return 0;
}
}
return 0;
}
static inline void init(int argc, char *argv[])
{
if (mkdir(VCX_DIR, 0755) == -1) {
if (errno != EEXIST)
err(1, "Failed to create %s", VCX_DIR);
}
if (mkdir(HEAD, 0755) == -1) {
if (errno != EEXIST)
err(1, "Failed to create %s", HEAD);
}
if (mkdir(OBJ_DIR, 0755) == -1) {
if (errno != EEXIST)
err(1, "Failed to create %s", OBJ_DIR);
}
if (mkdir(TMP_DIR, 0755) == -1) {
if (errno != EEXIST)
err(1, "Failed to create %s", TMP_DIR);
}
printf("Repository ready\n");
}
static inline void status(int argc, char *argv[])
{
if (nftw(HEAD, scan_head, MAX_DEPTH, FTW_PHYS) == -1)
err(1, "scan_head");
if (nftw(".", scan_tree, MAX_DEPTH, FTW_PHYS) == -1)
err(1, "scan_tree");
}
static char *path_buf = NULL;
static size_t path_buflen = 1024;
int scan_head(const char * path, const struct stat *sb, int flag,
struct FTW *ftwbuf)
{
char *wt_path;
struct stat wt_stat;
if (flag == FTW_F) {
const char *filename = path + ftwbuf->base;
wt_path = concat_path(".", filename);
if (lstat(wt_path, &wt_stat) == -1) {
if (errno == ENOENT) {
printf("[D] %s\n", wt_path);
return 0;
}
else
err(1, "lstat failed for %s", wt_path);
}
if (wt_stat.st_size == sb->st_size &&
wt_stat.st_mtime == sb->st_mtime)
return 0; // no change
if (S_ISREG(wt_stat.st_mode)) {
if (cmp_content(path, wt_path) == 1)
printf("[M] %s\n", wt_path);
} else if (S_ISLNK(wt_stat.st_mode)) {
if (cmp_links(path, wt_path) == 1)
printf("[M] %s\n", wt_path);
}
}
return 0;
}
static inline int scan_tree(const char * path, const struct stat *st,
int flag, struct FTW *ftwbuf)
{
char *hd_path;
if (fnmatch("./.vcx/*", path, FNM_PATHNAME) == 0)
return 0;
if (flag == FTW_F) {
const char *filename = path + ftwbuf->base;
hd_path = concat_path(HEAD, filename);
if (access(hd_path, F_OK) != 0)
printf("[N] %s\n", path);
}
return 0;
}
static inline int cmp_content(const char *file1, const char *file2)
{
pid_t pid;
int null_fd, status, rc;
pid = fork();
if (pid == 0) {
null_fd = open("/dev/null", O_WRONLY);
if (null_fd == -1)
err(1, "open() failed on /dev/null");
dup2(null_fd, STDOUT_FILENO);
dup2(null_fd, STDERR_FILENO);
close(null_fd);
execlp("diff", "diff", "-q", file1, file2, (char *)NULL);
err(1, "execlp failed for diff");
} else if (pid > 0) {
waitpid(pid, &status, 0);
// diff returns 0 if files are same, 1 if different, >1 if error
rc = WEXITSTATUS(status);
if (rc > 1)
err(1, "diff error");
return rc;
}
err(1, "fork");
}
static inline int cmp_links(const char *link1, const char *link2)
{
ssize_t len1, len2;
char buf1[PATH_MAX], buf2[PATH_MAX];
len1 = readlink(link1, buf1, sizeof(buf1) - 1);
len2 = readlink(link2, buf2, sizeof(buf2) - 1);
if (len1 < 0 || len2 < 0)
err(1, "readlink error on %s or %s", link1, link2);
if (len1 != len2)
return 1;
buf1[len1] = '\0';
buf2[len2] = '\0';
return strcmp(buf1, buf2);
}
static inline char *concat_path(const char *dir, const char *file)
{
size_t path_len;
if (!path_buf)
path_buf = MALLOC(sizeof(path_buf[0]) * path_buflen);
path_len = strlen(dir) + strlen(file) + 2;
if (path_len > path_buflen) {
path_buflen <<= 1;
path_buf = REALLOC(path_buf, sizeof(path_buf[0]) * path_buflen);
}
snprintf(path_buf, path_buflen, "%s/%s", dir, file);
return path_buf;
}
static inline void *_xmalloc(size_t s, const char *file, int line)
{
void *p;
if (!(p = malloc(s)))
err(1, "%s:%d: malloc", file, line);
return p;
}
static inline void *_xrealloc(void *ptr, size_t s, const char *file,
int line)
{
void *p;
if (!(p = realloc(ptr, s)))
err(1, "%s:%d: realloc", file, line);
return p;
}
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