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Merge branch 'sp/help'

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* sp/help:
  shell should call the new setup_path() to setup $PATH
  include $PATH in generating list of commands for "help -a"
  use only the $PATH for exec'ing git commands
  list_commands(): simplify code by using chdir()
  "current_exec_path" is a misleading name, use "argv_exec_path"
  remove unused/unneeded "pattern" argument of list_commands
  "git" returns 1; "git help" and "git help -a" return 0
This commit is contained in:
Junio C Hamano 2007-10-31 23:53:51 -07:00
parent 37701381b6 e8f5d87056
commit 452b800582
6 changed files with 200 additions and 175 deletions
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1
builtin.h
View file

@ -6,6 +6,7 @@
extern const char git_version_string[];
extern const char git_usage_string[];
extern void list_common_cmds_help(void);
extern void help_unknown_cmd(const char *cmd);
extern int write_tree(unsigned char *sha1, int missing_ok, const char *prefix);
extern void prune_packed_objects(int);

128
exec_cmd.c
View file

@ -5,11 +5,11 @@
extern char **environ;
static const char *builtin_exec_path = GIT_EXEC_PATH;
static const char *current_exec_path;
static const char *argv_exec_path;
void git_set_exec_path(const char *exec_path)
void git_set_argv_exec_path(const char *exec_path)
{
current_exec_path = exec_path;
argv_exec_path = exec_path;
}
@ -18,8 +18,8 @@ const char *git_exec_path(void)
{
const char *env;
if (current_exec_path)
return current_exec_path;
if (argv_exec_path)
return argv_exec_path;
env = getenv(EXEC_PATH_ENVIRONMENT);
if (env && *env) {
@ -29,85 +29,69 @@ const char *git_exec_path(void)
return builtin_exec_path;
}
static void add_path(struct strbuf *out, const char *path)
{
if (path && *path) {
if (is_absolute_path(path))
strbuf_addstr(out, path);
else
strbuf_addstr(out, make_absolute_path(path));
strbuf_addch(out, ':');
}
}
void setup_path(const char *cmd_path)
{
const char *old_path = getenv("PATH");
struct strbuf new_path;
strbuf_init(&new_path, 0);
add_path(&new_path, argv_exec_path);
add_path(&new_path, getenv(EXEC_PATH_ENVIRONMENT));
add_path(&new_path, builtin_exec_path);
add_path(&new_path, cmd_path);
if (old_path)
strbuf_addstr(&new_path, old_path);
else
strbuf_addstr(&new_path, "/usr/local/bin:/usr/bin:/bin");
setenv("PATH", new_path.buf, 1);
strbuf_release(&new_path);
}
int execv_git_cmd(const char **argv)
{
char git_command[PATH_MAX + 1];
int i;
const char *paths[] = { current_exec_path,
getenv(EXEC_PATH_ENVIRONMENT),
builtin_exec_path };
struct strbuf cmd;
const char *tmp;
for (i = 0; i < ARRAY_SIZE(paths); ++i) {
size_t len;
int rc;
const char *exec_dir = paths[i];
const char *tmp;
strbuf_init(&cmd, 0);
strbuf_addf(&cmd, "git-%s", argv[0]);
if (!exec_dir || !*exec_dir) continue;
/*
* argv[0] must be the git command, but the argv array
* belongs to the caller, and may be reused in
* subsequent loop iterations. Save argv[0] and
* restore it on error.
*/
tmp = argv[0];
argv[0] = cmd.buf;
if (*exec_dir != '/') {
if (!getcwd(git_command, sizeof(git_command))) {
fprintf(stderr, "git: cannot determine "
"current directory: %s\n",
strerror(errno));
break;
}
len = strlen(git_command);
trace_argv_printf(argv, -1, "trace: exec:");
/* Trivial cleanup */
while (!prefixcmp(exec_dir, "./")) {
exec_dir += 2;
while (*exec_dir == '/')
exec_dir++;
}
/* execvp() can only ever return if it fails */
execvp(cmd.buf, (char **)argv);
rc = snprintf(git_command + len,
sizeof(git_command) - len, "/%s",
exec_dir);
if (rc < 0 || rc >= sizeof(git_command) - len) {
fprintf(stderr, "git: command name given "
"is too long.\n");
break;
}
} else {
if (strlen(exec_dir) + 1 > sizeof(git_command)) {
fprintf(stderr, "git: command name given "
"is too long.\n");
break;
}
strcpy(git_command, exec_dir);
}
trace_printf("trace: exec failed: %s\n", strerror(errno));
len = strlen(git_command);
rc = snprintf(git_command + len, sizeof(git_command) - len,
"/git-%s", argv[0]);
if (rc < 0 || rc >= sizeof(git_command) - len) {
fprintf(stderr,
"git: command name given is too long.\n");
break;
}
argv[0] = tmp;
/* argv[0] must be the git command, but the argv array
* belongs to the caller, and my be reused in
* subsequent loop iterations. Save argv[0] and
* restore it on error.
*/
strbuf_release(&cmd);
tmp = argv[0];
argv[0] = git_command;
trace_argv_printf(argv, -1, "trace: exec:");
/* execve() can only ever return if it fails */
execve(git_command, (char **)argv, environ);
trace_printf("trace: exec failed: %s\n", strerror(errno));
argv[0] = tmp;
}
return -1;
}

3
exec_cmd.h
View file

@ -1,8 +1,9 @@
#ifndef GIT_EXEC_CMD_H
#define GIT_EXEC_CMD_H
extern void git_set_exec_path(const char *exec_path);
extern void git_set_argv_exec_path(const char *exec_path);
extern const char* git_exec_path(void);
extern void setup_path(const char *);
extern int execv_git_cmd(const char **argv); /* NULL terminated */
extern int execl_git_cmd(const char *cmd, ...);

52
git.c
View file

@ -6,28 +6,6 @@
const char git_usage_string[] =
"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate|--no-pager] [--bare] [--git-dir=GIT_DIR] [--work-tree=GIT_WORK_TREE] [--help] COMMAND [ARGS]";
static void prepend_to_path(const char *dir, int len)
{
const char *old_path = getenv("PATH");
char *path;
int path_len = len;
if (!old_path)
old_path = "/usr/local/bin:/usr/bin:/bin";
path_len = len + strlen(old_path) + 1;
path = xmalloc(path_len + 1);
memcpy(path, dir, len);
path[len] = ':';
memcpy(path + len + 1, old_path, path_len - len);
setenv("PATH", path, 1);
free(path);
}
static int handle_options(const char*** argv, int* argc, int* envchanged)
{
int handled = 0;
@ -51,7 +29,7 @@ static int handle_options(const char*** argv, int* argc, int* envchanged)
if (!prefixcmp(cmd, "--exec-path")) {
cmd += 11;
if (*cmd == '=')
git_set_exec_path(cmd + 1);
git_set_argv_exec_path(cmd + 1);
else {
puts(git_exec_path());
exit(0);
@ -408,7 +386,7 @@ int main(int argc, const char **argv)
{
const char *cmd = argv[0] ? argv[0] : "git-help";
char *slash = strrchr(cmd, '/');
const char *exec_path = NULL;
const char *cmd_path = NULL;
int done_alias = 0;
/*
@ -418,10 +396,7 @@ int main(int argc, const char **argv)
*/
if (slash) {
*slash++ = 0;
if (*cmd == '/')
exec_path = cmd;
else
exec_path = xstrdup(make_absolute_path(cmd));
cmd_path = cmd;
cmd = slash;
}
@ -450,23 +425,20 @@ int main(int argc, const char **argv)
if (!prefixcmp(argv[0], "--"))
argv[0] += 2;
} else {
/* Default command: "help" */
argv[0] = "help";
argc = 1;
/* The user didn't specify a command; give them help */
printf("usage: %s\n\n", git_usage_string);
list_common_cmds_help();
exit(1);
}
cmd = argv[0];
/*
* We execute external git command via execv_git_cmd(),
* which looks at "--exec-path" option, GIT_EXEC_PATH
* environment, and $(gitexecdir) in Makefile while built,
* in this order. For scripted commands, we prepend
* the value of the exec_path variable to the PATH.
* We use PATH to find git commands, but we prepend some higher
* precidence paths: the "--exec-path" option, the GIT_EXEC_PATH
* environment, and the $(gitexecdir) from the Makefile at build
* time.
*/
if (exec_path)
prepend_to_path(exec_path, strlen(exec_path));
exec_path = git_exec_path();
prepend_to_path(exec_path, strlen(exec_path));
setup_path(cmd_path);
while (1) {
/* See if it's an internal command */

183
help.c
View file

@ -37,24 +37,25 @@ static inline void mput_char(char c, unsigned int num)
putchar(c);
}
static struct cmdname {
size_t len;
char name[1];
} **cmdname;
static int cmdname_alloc, cmdname_cnt;
static struct cmdnames {
int alloc;
int cnt;
struct cmdname {
size_t len;
char name[1];
} **names;
} main_cmds, other_cmds;
static void add_cmdname(const char *name, int len)
static void add_cmdname(struct cmdnames *cmds, const char *name, int len)
{
struct cmdname *ent;
if (cmdname_alloc <= cmdname_cnt) {
cmdname_alloc = cmdname_alloc + 200;
cmdname = xrealloc(cmdname, cmdname_alloc * sizeof(*cmdname));
}
ent = xmalloc(sizeof(*ent) + len);
struct cmdname *ent = xmalloc(sizeof(*ent) + len);
ent->len = len;
memcpy(ent->name, name, len);
ent->name[len] = 0;
cmdname[cmdname_cnt++] = ent;
ALLOC_GROW(cmds->names, cmds->cnt + 1, cmds->alloc);
cmds->names[cmds->cnt++] = ent;
}
static int cmdname_compare(const void *a_, const void *b_)
@ -64,7 +65,42 @@ static int cmdname_compare(const void *a_, const void *b_)
return strcmp(a->name, b->name);
}
static void pretty_print_string_list(struct cmdname **cmdname, int longest)
static void uniq(struct cmdnames *cmds)
{
int i, j;
if (!cmds->cnt)
return;
for (i = j = 1; i < cmds->cnt; i++)
if (strcmp(cmds->names[i]->name, cmds->names[i-1]->name))
cmds->names[j++] = cmds->names[i];
cmds->cnt = j;
}
static void exclude_cmds(struct cmdnames *cmds, struct cmdnames *excludes) {
int ci, cj, ei;
int cmp;
ci = cj = ei = 0;
while (ci < cmds->cnt && ei < excludes->cnt) {
cmp = strcmp(cmds->names[ci]->name, excludes->names[ei]->name);
if (cmp < 0)
cmds->names[cj++] = cmds->names[ci++];
else if (cmp == 0)
ci++, ei++;
else if (cmp > 0)
ei++;
}
while (ci < cmds->cnt)
cmds->names[cj++] = cmds->names[ci++];
cmds->cnt = cj;
}
static void pretty_print_string_list(struct cmdnames *cmds, int longest)
{
int cols = 1, rows;
int space = longest + 1; /* min 1 SP between words */
@ -73,9 +109,7 @@ static void pretty_print_string_list(struct cmdname **cmdname, int longest)
if (space < max_cols)
cols = max_cols / space;
rows = (cmdname_cnt + cols - 1) / cols;
qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
rows = (cmds->cnt + cols - 1) / cols;
for (i = 0; i < rows; i++) {
printf(" ");
@ -83,71 +117,112 @@ static void pretty_print_string_list(struct cmdname **cmdname, int longest)
for (j = 0; j < cols; j++) {
int n = j * rows + i;
int size = space;
if (n >= cmdname_cnt)
if (n >= cmds->cnt)
break;
if (j == cols-1 || n + rows >= cmdname_cnt)
if (j == cols-1 || n + rows >= cmds->cnt)
size = 1;
printf("%-*s", size, cmdname[n]->name);
printf("%-*s", size, cmds->names[n]->name);
}
putchar('\n');
}
}
static void list_commands(const char *exec_path, const char *pattern)
static unsigned int list_commands_in_dir(struct cmdnames *cmds,
const char *path)
{
unsigned int longest = 0;
char path[PATH_MAX];
int dirlen;
DIR *dir = opendir(exec_path);
const char *prefix = "git-";
int prefix_len = strlen(prefix);
DIR *dir = opendir(path);
struct dirent *de;
if (!dir) {
fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
exit(1);
}
dirlen = strlen(exec_path);
if (PATH_MAX - 20 < dirlen) {
fprintf(stderr, "git: insanely long exec-path '%s'\n",
exec_path);
exit(1);
}
memcpy(path, exec_path, dirlen);
path[dirlen++] = '/';
if (!dir || chdir(path))
return 0;
while ((de = readdir(dir)) != NULL) {
struct stat st;
int entlen;
if (prefixcmp(de->d_name, "git-"))
if (prefixcmp(de->d_name, prefix))
continue;
strcpy(path+dirlen, de->d_name);
if (stat(path, &st) || /* stat, not lstat */
if (stat(de->d_name, &st) || /* stat, not lstat */
!S_ISREG(st.st_mode) ||
!(st.st_mode & S_IXUSR))
continue;
entlen = strlen(de->d_name);
entlen = strlen(de->d_name) - prefix_len;
if (has_extension(de->d_name, ".exe"))
entlen -= 4;
if (longest < entlen)
longest = entlen;
add_cmdname(de->d_name + 4, entlen-4);
add_cmdname(cmds, de->d_name + prefix_len, entlen);
}
closedir(dir);
printf("git commands available in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(cmdname, longest - 4);
putchar('\n');
return longest;
}
static void list_common_cmds_help(void)
static void list_commands(void)
{
unsigned int longest = 0;
unsigned int len;
const char *env_path = getenv("PATH");
char *paths, *path, *colon;
const char *exec_path = git_exec_path();
if (exec_path)
longest = list_commands_in_dir(&main_cmds, exec_path);
if (!env_path) {
fprintf(stderr, "PATH not set\n");
exit(1);
}
path = paths = xstrdup(env_path);
while (1) {
if ((colon = strchr(path, ':')))
*colon = 0;
len = list_commands_in_dir(&other_cmds, path);
if (len > longest)
longest = len;
if (!colon)
break;
path = colon + 1;
}
free(paths);
qsort(main_cmds.names, main_cmds.cnt,
sizeof(*main_cmds.names), cmdname_compare);
uniq(&main_cmds);
qsort(other_cmds.names, other_cmds.cnt,
sizeof(*other_cmds.names), cmdname_compare);
uniq(&other_cmds);
exclude_cmds(&other_cmds, &main_cmds);
if (main_cmds.cnt) {
printf("available git commands in '%s'\n", exec_path);
printf("----------------------------");
mput_char('-', strlen(exec_path));
putchar('\n');
pretty_print_string_list(&main_cmds, longest);
putchar('\n');
}
if (other_cmds.cnt) {
printf("git commands available from elsewhere on your $PATH\n");
printf("---------------------------------------------------\n");
pretty_print_string_list(&other_cmds, longest);
putchar('\n');
}
}
void list_common_cmds_help(void)
{
int i, longest = 0;
@ -198,19 +273,17 @@ int cmd_version(int argc, const char **argv, const char *prefix)
int cmd_help(int argc, const char **argv, const char *prefix)
{
const char *help_cmd = argc > 1 ? argv[1] : NULL;
const char *exec_path = git_exec_path();
if (!help_cmd) {
printf("usage: %s\n\n", git_usage_string);
list_common_cmds_help();
exit(1);
exit(0);
}
else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a")) {
printf("usage: %s\n\n", git_usage_string);
if(exec_path)
list_commands(exec_path, "git-*");
exit(1);
list_commands();
exit(0);
}
else

8
shell.c
View file

@ -24,17 +24,11 @@ static int do_cvs_cmd(const char *me, char *arg)
const char *cvsserver_argv[3] = {
"cvsserver", "server", NULL
};
const char *oldpath = getenv("PATH");
struct strbuf newpath = STRBUF_INIT;
if (!arg || strcmp(arg, "server"))
die("git-cvsserver only handles server: %s", arg);
strbuf_addstr(&newpath, git_exec_path());
strbuf_addch(&newpath, ':');
strbuf_addstr(&newpath, oldpath);
setenv("PATH", strbuf_detach(&newpath, NULL), 1);
setup_path(NULL);
return execv_git_cmd(cvsserver_argv);
}