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authorRafael G. Martins <rafael@rafaelmartins.eng.br>2016-09-29 00:49:36 +0200
committerRafael G. Martins <rafael@rafaelmartins.eng.br>2016-09-29 00:49:36 +0200
commit3fff4bb3172f77b292b0c913749e81bedd3545f3 (patch)
treecf0445fac31f374445c7706bd7b4d62fa10101bc /src/blogc-git-receiver/shell.c
parent4f1f932f6ef6d6c9770266775c2db072964d7a62 (diff)
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git-receiver: splitted code
Diffstat (limited to 'src/blogc-git-receiver/shell.c')
-rw-r--r--src/blogc-git-receiver/shell.c206
1 files changed, 206 insertions, 0 deletions
diff --git a/src/blogc-git-receiver/shell.c b/src/blogc-git-receiver/shell.c
new file mode 100644
index 0000000..290526b
--- /dev/null
+++ b/src/blogc-git-receiver/shell.c
@@ -0,0 +1,206 @@
+/*
+ * blogc: A blog compiler.
+ * Copyright (C) 2015-2016 Rafael G. Martins <rafael@rafaelmartins.eng.br>
+ *
+ * This program can be distributed under the terms of the BSD License.
+ * See the file LICENSE.
+ */
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include "../common/utils.h"
+#include "shell.h"
+
+#ifndef BUFFER_SIZE
+#define BUFFER_SIZE 4096
+#endif
+
+
+int
+bgr_shell(int argc, char *argv[])
+{
+ int rv = 0;
+
+ char *repo = NULL;
+ char *command_orig = NULL;
+ char *command_name = NULL;
+ char command_new[BUFFER_SIZE];
+
+ bool exec_git = false;
+
+ // validate git command
+ size_t len = strlen(argv[2]);
+ if (!((len > 17 && (0 == strncmp(argv[2], "git-receive-pack ", 17))) ||
+ (len > 16 && (0 == strncmp(argv[2], "git-upload-pack ", 16))) ||
+ (len > 19 && (0 == strncmp(argv[2], "git-upload-archive ", 19)))))
+ {
+ fprintf(stderr, "error: unsupported git command: %s\n", argv[2]);
+ rv = 1;
+ goto cleanup;
+ }
+
+ // 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 home path
+ char *home = getenv("HOME");
+ if (home == NULL) {
+ fprintf(stderr, "error: failed to find user home path\n");
+ rv = 1;
+ goto cleanup;
+ }
+
+ // get git repository
+ command_orig = bc_strdup(argv[2]);
+ char *p, *r;
+ for (p = command_orig; *p != ' ' && *p != '\0'; p++);
+ if (*p == ' ')
+ p++;
+ if (*p == '\'' || *p == '"')
+ p++;
+ if (*p == '/')
+ p++;
+ for (r = p; *p != '\'' && *p != '"' && *p != '\0'; p++);
+ if (*p == '\'' || *p == '"')
+ *p = '\0';
+ if (*--p == '/')
+ *p = '\0';
+
+ repo = bc_strdup_printf("repos/%s", r);
+
+ // check if repository is sane
+ if (0 == strlen(repo)) {
+ fprintf(stderr, "error: invalid repository\n");
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (0 == strncmp(argv[2], "git-upload-", 11)) // no need to check len here
+ goto git_exec;
+
+ if (0 != chdir(home)) {
+ fprintf(stderr, "error: failed to chdir (%s): %s\n", home,
+ strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (0 != access(repo, F_OK)) {
+ char *git_init_cmd = bc_strdup_printf(
+ "git init --bare \"%s\" > /dev/null", 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): %s\n", home, 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/%s/hooks): "
+ "%s\n", home, repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+ }
+
+ if (0 != chdir("hooks")) {
+ fprintf(stderr, "error: failed to chdir (%s/%s/hooks): %s\n", home,
+ repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (0 == access("pre-receive", F_OK)) {
+ if (0 != unlink("pre-receive")) {
+ fprintf(stderr, "error: failed to remove old symlink "
+ "(%s/%s/hooks/pre-receive): %s\n", home, repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+ }
+
+ if (0 != symlink(self, "pre-receive")) {
+ fprintf(stderr, "error: failed to create symlink "
+ "(%s/%s/hooks/pre-receive): %s\n", home, repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (0 == access("post-receive", F_OK)) {
+ if (0 != unlink("post-receive")) {
+ fprintf(stderr, "error: failed to remove old symlink "
+ "(%s/%s/hooks/post-receive): %s\n", home, repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+ }
+
+ if (0 != symlink(self, "post-receive")) {
+ fprintf(stderr, "error: failed to create symlink "
+ "(%s/%s/hooks/post-receive): %s\n", home, repo, strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (0 != chdir(home)) {
+ fprintf(stderr, "error: failed to chdir (%s): %s\n", home,
+ strerror(errno));
+ rv = 1;
+ goto cleanup;
+ }
+
+git_exec:
+ command_name = bc_strdup(argv[2]);
+ for (p = command_name; *p != ' ' && *p != '\0'; p++);
+ if (*p == ' ')
+ *p = '\0';
+
+ if (BUFFER_SIZE < (strlen(command_name) + strlen(repo) + 4)) {
+ fprintf(stderr, "error: git-shell command is too big\n");
+ rv = 1;
+ goto cleanup;
+ }
+
+ if (snprintf(command_new, BUFFER_SIZE, "%s '%s'", command_name, repo))
+ exec_git = true;
+
+cleanup:
+ free(repo);
+ free(command_orig);
+ free(command_name);
+
+ if (exec_git) {
+ execlp("git-shell", "git-shell", "-c", command_new, NULL);
+
+ // execlp only returns on error, then something bad happened
+ fprintf(stderr, "error: failed to execute git-shell\n");
+ rv = 1;
+ }
+
+ return rv;
+}