a025463bc0
This disables alias "foo" from being used for git-foo, and when we do use alias we check the built-in and then existing command names first and then alias as the fallback. This avoids the problem of common commands used in scripts getting clobbered by user specific aliases. Signed-off-by: Junio C Hamano <junkio@cox.net>
314 lines
6.7 KiB
C
314 lines
6.7 KiB
C
#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdarg.h>
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#include "git-compat-util.h"
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#include "exec_cmd.h"
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#include "cache.h"
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#include "builtin.h"
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static void prepend_to_path(const char *dir, int len)
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{
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char *path, *old_path = getenv("PATH");
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int path_len = len;
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if (!old_path)
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old_path = "/usr/local/bin:/usr/bin:/bin";
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path_len = len + strlen(old_path) + 1;
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path = malloc(path_len + 1);
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memcpy(path, dir, len);
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path[len] = ':';
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memcpy(path + len + 1, old_path, path_len - len);
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setenv("PATH", path, 1);
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}
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static const char *alias_command;
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static char *alias_string = NULL;
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static int git_alias_config(const char *var, const char *value)
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{
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if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
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alias_string = strdup(value);
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}
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return 0;
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}
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static int split_cmdline(char *cmdline, const char ***argv)
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{
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int src, dst, count = 0, size = 16;
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char quoted = 0;
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*argv = malloc(sizeof(char*) * size);
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/* split alias_string */
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(*argv)[count++] = cmdline;
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for (src = dst = 0; cmdline[src];) {
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char c = cmdline[src];
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if (!quoted && isspace(c)) {
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cmdline[dst++] = 0;
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while (cmdline[++src]
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&& isspace(cmdline[src]))
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; /* skip */
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if (count >= size) {
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size += 16;
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*argv = realloc(*argv, sizeof(char*) * size);
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}
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(*argv)[count++] = cmdline + dst;
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} else if(!quoted && (c == '\'' || c == '"')) {
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quoted = c;
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src++;
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} else if (c == quoted) {
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quoted = 0;
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src++;
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} else {
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if (c == '\\' && quoted != '\'') {
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src++;
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c = cmdline[src];
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if (!c) {
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free(*argv);
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*argv = NULL;
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return error("cmdline ends with \\");
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}
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}
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cmdline[dst++] = c;
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src++;
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}
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}
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cmdline[dst] = 0;
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if (quoted) {
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free(*argv);
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*argv = NULL;
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return error("unclosed quote");
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}
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return count;
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}
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static int handle_alias(int *argcp, const char ***argv)
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{
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int nongit = 0, ret = 0;
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const char *subdir;
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subdir = setup_git_directory_gently(&nongit);
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if (!nongit) {
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int count;
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const char** new_argv;
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alias_command = (*argv)[0];
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git_config(git_alias_config);
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if (alias_string) {
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count = split_cmdline(alias_string, &new_argv);
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if (count < 1)
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die("empty alias for %s", alias_command);
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if (!strcmp(alias_command, new_argv[0]))
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die("recursive alias: %s", alias_command);
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/* insert after command name */
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if (*argcp > 1) {
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new_argv = realloc(new_argv, sizeof(char*) *
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(count + *argcp - 1));
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memcpy(new_argv + count, *argv, sizeof(char*) *
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(*argcp - 1));
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}
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*argv = new_argv;
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*argcp += count - 1;
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ret = 1;
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}
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}
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if (subdir)
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chdir(subdir);
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return ret;
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}
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const char git_version_string[] = GIT_VERSION;
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static void handle_internal_command(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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static struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, char **);
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} commands[] = {
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{ "version", cmd_version },
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{ "help", cmd_help },
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{ "log", cmd_log },
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{ "whatchanged", cmd_whatchanged },
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{ "show", cmd_show },
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{ "push", cmd_push },
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{ "format-patch", cmd_format_patch },
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{ "count-objects", cmd_count_objects },
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{ "diff", cmd_diff },
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{ "grep", cmd_grep },
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{ "rm", cmd_rm },
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{ "add", cmd_add },
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{ "rev-list", cmd_rev_list },
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{ "init-db", cmd_init_db },
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{ "tar-tree", cmd_tar_tree },
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{ "upload-tar", cmd_upload_tar },
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{ "check-ref-format", cmd_check_ref_format },
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{ "ls-files", cmd_ls_files },
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{ "ls-tree", cmd_ls_tree },
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{ "tar-tree", cmd_tar_tree },
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{ "read-tree", cmd_read_tree },
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{ "commit-tree", cmd_commit_tree },
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{ "apply", cmd_apply },
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{ "show-branch", cmd_show_branch },
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{ "diff-files", cmd_diff_files },
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{ "diff-index", cmd_diff_index },
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{ "diff-stages", cmd_diff_stages },
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{ "diff-tree", cmd_diff_tree },
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{ "cat-file", cmd_cat_file },
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{ "rev-parse", cmd_rev_parse }
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};
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int i;
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/* Turn "git cmd --help" into "git help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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if (strcmp(p->cmd, cmd))
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continue;
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exit(p->fn(argc, argv, envp));
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}
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}
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int main(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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char *slash = strrchr(cmd, '/');
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char git_command[PATH_MAX + 1];
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const char *exec_path = NULL;
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int done_alias = 0;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if it's an absolute path and we don't have
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* anything better.
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*/
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if (slash) {
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*slash++ = 0;
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if (*cmd == '/')
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exec_path = cmd;
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!strncmp(cmd, "git-", 4)) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv, envp);
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die("cannot handle %s internally", cmd);
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}
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/* Default command: "help" */
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cmd = "help";
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/* Look for flags.. */
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while (argc > 1) {
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cmd = *++argv;
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argc--;
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if (strncmp(cmd, "--", 2))
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break;
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cmd += 2;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "help"))
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break;
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if (!strcmp(cmd, "version"))
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break;
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/*
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* Check remaining flags (which by now must be
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* "--exec-path", but maybe we will accept
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* other arguments some day)
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*/
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if (!strncmp(cmd, "exec-path", 9)) {
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cmd += 9;
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if (*cmd == '=') {
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git_set_exec_path(cmd + 1);
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continue;
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}
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puts(git_exec_path());
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exit(0);
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}
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cmd_usage(0, NULL, NULL);
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}
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argv[0] = cmd;
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/*
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* We search for git commands in the following order:
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* - git_exec_path()
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* - the path of the "git" command if we could find it
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* in $0
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* - the regular PATH.
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*/
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if (exec_path)
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prepend_to_path(exec_path, strlen(exec_path));
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exec_path = git_exec_path();
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prepend_to_path(exec_path, strlen(exec_path));
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while (1) {
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/* See if it's an internal command */
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handle_internal_command(argc, argv, envp);
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/* .. then try the external ones */
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execv_git_cmd(argv);
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/* It could be an alias -- this works around the insanity
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* of overriding "git log" with "git show" by having
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* alias.log = show
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*/
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if (done_alias || !handle_alias(&argc, &argv))
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break;
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done_alias = 1;
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}
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if (errno == ENOENT)
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cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
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fprintf(stderr, "Failed to run command '%s': %s\n",
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git_command, strerror(errno));
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return 1;
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}
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