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//
// Created by Anshul Gupta on 4/7/25.
//
#include "precheck.h"
#include <stdio.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
/**
* Check if git is installed and available in the PATH.
* @return 1 if git is available, 0 if not.
*/
static int has_git(void)
{
pid_t pid = fork();
if (pid < 0) {
perror("fork");
return 0;
}
if (pid == 0) {
// Child process
char *args[] = {"git", "--version", NULL};
execvp("git", args);
_exit(127); // execvp only returns on error
}
// Parent process
int status;
pid_t result;
do {
result = waitpid(pid, &status, 0);
} while (result == -1 && errno == EINTR);
if (result == -1) {
perror("waitpid");
return 0;
}
// Check exit status
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
return 1; // git is available
}
fprintf(stderr, "Error: git is not installed or not found in PATH\n");
return 0; // git is not available
}
/**
* Check if the git base directory exists.
* @param path Path to the directory to check
* @return 1 if the directory exists, 0 if not.
*/
static int git_base_exists(const char *path)
{
struct stat st;
if (stat(path, &st) == 0 && S_ISDIR(st.st_mode)) {
return 1;
}
fprintf(stderr, "Error: git base directory does not exist: %s\n", path);
return 0;
}
int precheck_self(const struct config *cfg)
{
if (!has_git())
return -1;
if (!git_base_exists(cfg->git_base))
return -1;
return 0;
}
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