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/*
* blogc: A blog compiler.
* Copyright (C) 2014-2020 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include "../common/utils.h"
#include "settings.h"
#include "shell-command-parser.h"
#include "shell.h"
static bool
lexists(const char *pathname)
{
struct stat b;
int tmp_errno = errno;
bool rv = lstat(pathname, &b) == 0;
errno = tmp_errno;
return rv;
}
int
bgr_shell(int argc, char *argv[])
{
int rv = 0;
char *repo = NULL;
char *quoted_repo = NULL;
// get shell path
char *self = getenv("SHELL");
if (self == NULL) {
fprintf(stderr, "error: failed to find blogc-git-receiver path\n");
rv = 1;
goto cleanup;
}
// get base dir path
const char *bd = bgr_settings_get_base_dir();
if (bd == NULL) {
fprintf(stderr, "error: failed to find base directory path\n");
rv = 1;
goto cleanup;
}
// validate command and extract git repository
char *tmp_repo = bgr_shell_command_parse(argv[2]);
if (tmp_repo == NULL) {
fprintf(stderr, "error: invalid git-shell command: %s\n", argv[2]);
rv = 1;
goto cleanup;
}
repo = bc_strdup_printf("%s/repos/%s", bd, tmp_repo);
quoted_repo = bc_shell_quote(repo);
free(tmp_repo);
if (0 == strncmp(argv[2], "git-upload-", 11)) // no need to check len here
goto git_exec;
if (0 != access(repo, F_OK)) {
char *git_init_cmd = bc_strdup_printf(
"git init --bare %s > /dev/null", quoted_repo);
if (0 != system(git_init_cmd)) {
fprintf(stderr, "error: failed to create git repository: %s\n",
repo);
rv = 1;
free(git_init_cmd);
goto cleanup;
}
free(git_init_cmd);
}
if (0 != chdir(repo)) {
fprintf(stderr, "error: failed to chdir (%s): %s\n", repo,
strerror(errno));
rv = 1;
goto cleanup;
}
if (0 != access("hooks", F_OK)) {
// openwrt git package won't install git templates, then the git
// repositories created with it won't have the hooks/ directory.
if (0 != mkdir("hooks", 0777)) { // mkdir honors umask for us.
fprintf(stderr, "error: failed to create directory (%s/hooks): "
"%s\n", repo, strerror(errno));
rv = 1;
goto cleanup;
}
}
if (0 != chdir("hooks")) {
fprintf(stderr, "error: failed to chdir (%s/hooks): %s\n", repo,
strerror(errno));
rv = 1;
goto cleanup;
}
if (lexists("pre-receive")) {
if (0 != unlink("pre-receive")) {
fprintf(stderr, "error: failed to remove old symlink "
"(%s/hooks/pre-receive): %s\n", repo, strerror(errno));
rv = 1;
goto cleanup;
}
}
if (0 != symlink(self, "pre-receive")) {
fprintf(stderr, "error: failed to create symlink "
"(%s/hooks/pre-receive): %s\n", repo, strerror(errno));
rv = 1;
goto cleanup;
}
if (lexists("post-receive")) {
if (0 != unlink("post-receive")) {
fprintf(stderr, "error: failed to remove old symlink "
"(%s/hooks/post-receive): %s\n", repo, strerror(errno));
rv = 1;
goto cleanup;
}
}
if (0 != symlink(self, "post-receive")) {
fprintf(stderr, "error: failed to create symlink "
"(%s/hooks/post-receive): %s\n", repo, strerror(errno));
rv = 1;
goto cleanup;
}
git_exec:
if (0 != chdir(bd)) {
fprintf(stderr, "error: failed to chdir (%s): %s\n", bd, strerror(errno));
rv = 1;
goto cleanup;
}
// static allocation instead of bc_strdup_printf to avoid leaks
char buffer[4096];
char *command = bc_strdup(argv[2]);
char *p;
for (p = command; *p != ' ' && *p != '\0'; p++);
if (*p == ' ')
*p = '\0';
if (sizeof(buffer) < (strlen(command) + strlen(quoted_repo) + 2)) {
fprintf(stderr, "error: git-shell command is too big\n");
rv = 1;
goto cleanup;
}
if (0 > snprintf(buffer, sizeof(buffer), "%s %s", command, quoted_repo)) {
fprintf(stderr, "error: failed to generate git-shell command\n");
rv = 1;
goto cleanup;
}
free(command);
free(repo);
free(quoted_repo);
// this is a hack. no memory handling should be done inside this block
if (NULL == getenv("__VALGRIND_ENABLED")) {
execlp("git-shell", "git-shell", "-c", buffer, NULL);
// execlp only returns on error, then something bad happened
fprintf(stderr, "error: failed to execute git-shell\n");
return 1;
}
printf("git-shell -c \"%s\"\n", buffer); // used by tests, ignore
return 0;
cleanup:
free(repo);
free(quoted_repo);
return rv;
}
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