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Prepare execv_git_cmd() for removal of builtins from the filesystem 

Currently, execv_git_cmd() always try running the dashed form, which
means we cannot easily remove the git-foo hardlinks for built-in
commands.  This updates the function to always exec "git foo" form, and
makes sure "git" potty does not infinitely recurse to itself.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano 2007-12-01 22:09:22 -08:00
parent 0a47dc110e
commit 7550be0a2b
2 changed files with 43 additions and 20 deletions
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31
exec_cmd.c
View File

@ -65,32 +65,25 @@ void setup_path(const char *cmd_path)
int execv_git_cmd(const char **argv)
{
struct strbuf cmd;
const char *tmp;
int argc;
const char **nargv;
strbuf_init(&cmd, 0);
strbuf_addf(&cmd, "git-%s", argv[0]);
for (argc = 0; argv[argc]; argc++)
; /* just counting */
nargv = xmalloc(sizeof(*nargv) * (argc + 2));
/*
* 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;
trace_argv_printf(argv, "trace: exec:");
nargv[0] = "git";
for (argc = 0; argv[argc]; argc++)
nargv[argc + 1] = argv[argc];
nargv[argc + 1] = NULL;
trace_argv_printf(nargv, "trace: exec:");
/* execvp() can only ever return if it fails */
execvp(cmd.buf, (char **)argv);
execvp("git", (char **)nargv);
trace_printf("trace: exec failed: %s\n", strerror(errno));
argv[0] = tmp;
strbuf_release(&cmd);
free(nargv);
return -1;
}

32
git.c
View File

@ -384,6 +384,36 @@ static void handle_internal_command(int argc, const char **argv)
}
}
static void execv_dashed_external(const char **argv)
{
struct strbuf cmd;
const char *tmp;
strbuf_init(&cmd, 0);
strbuf_addf(&cmd, "git-%s", argv[0]);
/*
* 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;
trace_argv_printf(argv, "trace: exec:");
/* execvp() can only ever return if it fails */
execvp(cmd.buf, (char **)argv);
trace_printf("trace: exec failed: %s\n", strerror(errno));
argv[0] = tmp;
strbuf_release(&cmd);
}
int main(int argc, const char **argv)
{
const char *cmd = argv[0] ? argv[0] : "git-help";
@ -448,7 +478,7 @@ int main(int argc, const char **argv)
handle_internal_command(argc, argv);
/* .. then try the external ones */
execv_git_cmd(argv);
execv_dashed_external(argv);
/* It could be an alias -- this works around the insanity
* of overriding "git log" with "git show" by having