mirror of
https://github.com/git/git.git
synced 2024-11-28 12:34:08 +08:00
c90d565a46
Let PATH0=$PATH that was set before the invocation. Let /foo be a build directory. Let /pfx be the installation prefix. Let pfxexecpath=/pfx/libexec/git-core. The following is going on when 'git --exec-path=/foo gc' is invoked: 1. git sets PATH=/foo:$PATH0 using the path from --exec-path 2. gc execs 'git repack' (note: no dash). 3. Since there is a git in /foo (it's a build directory), /foo/git is taken. 4. No explicit exec-path is set this time, hence, this secondary git sets PATH=$pfxexecpath:/foo:$PATH 5. Since 'repack' is not a built-in, execv_dashed_external execs 'git-repack' (note: dash). 6. There is a $pfxexecpath/git-repack, and it is taken. 7. This git-repack runs 'git pack-objects' (note: no dash). 8. There is no git in $pfxexecpath, but there is one in /foo. Hence, /foo/git is run. 9. pack-objects is a builtin, hence, in effect /foo/git-pack-objects is run. As you can see, the way in which we previously set the PATH allowed to mix gits of different vintage. By setting GIT_EXEC_PATH when --exec-path was given on the command line, we reduce the confusion. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
137 lines
2.6 KiB
C
137 lines
2.6 KiB
C
#include "cache.h"
|
|
#include "exec_cmd.h"
|
|
#include "quote.h"
|
|
#define MAX_ARGS 32
|
|
|
|
extern char **environ;
|
|
static const char *argv_exec_path;
|
|
static const char *argv0_path;
|
|
|
|
const char *system_path(const char *path)
|
|
{
|
|
if (!is_absolute_path(path) && argv0_path) {
|
|
struct strbuf d = STRBUF_INIT;
|
|
strbuf_addf(&d, "%s/%s", argv0_path, path);
|
|
path = strbuf_detach(&d, NULL);
|
|
}
|
|
return path;
|
|
}
|
|
|
|
void git_set_argv0_path(const char *path)
|
|
{
|
|
argv0_path = path;
|
|
}
|
|
|
|
void git_set_argv_exec_path(const char *exec_path)
|
|
{
|
|
argv_exec_path = exec_path;
|
|
/*
|
|
* Propagate this setting to external programs.
|
|
*/
|
|
setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
|
|
}
|
|
|
|
|
|
/* Returns the highest-priority, location to look for git programs. */
|
|
const char *git_exec_path(void)
|
|
{
|
|
const char *env;
|
|
|
|
if (argv_exec_path)
|
|
return argv_exec_path;
|
|
|
|
env = getenv(EXEC_PATH_ENVIRONMENT);
|
|
if (env && *env) {
|
|
return env;
|
|
}
|
|
|
|
return system_path(GIT_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_nonrelative_path(path));
|
|
|
|
strbuf_addch(out, PATH_SEP);
|
|
}
|
|
}
|
|
|
|
void setup_path(void)
|
|
{
|
|
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, system_path(GIT_EXEC_PATH));
|
|
add_path(&new_path, argv0_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);
|
|
}
|
|
|
|
const char **prepare_git_cmd(const char **argv)
|
|
{
|
|
int argc;
|
|
const char **nargv;
|
|
|
|
for (argc = 0; argv[argc]; argc++)
|
|
; /* just counting */
|
|
nargv = xmalloc(sizeof(*nargv) * (argc + 2));
|
|
|
|
nargv[0] = "git";
|
|
for (argc = 0; argv[argc]; argc++)
|
|
nargv[argc + 1] = argv[argc];
|
|
nargv[argc + 1] = NULL;
|
|
return nargv;
|
|
}
|
|
|
|
int execv_git_cmd(const char **argv) {
|
|
const char **nargv = prepare_git_cmd(argv);
|
|
trace_argv_printf(nargv, "trace: exec:");
|
|
|
|
/* execvp() can only ever return if it fails */
|
|
execvp("git", (char **)nargv);
|
|
|
|
trace_printf("trace: exec failed: %s\n", strerror(errno));
|
|
|
|
free(nargv);
|
|
return -1;
|
|
}
|
|
|
|
|
|
int execl_git_cmd(const char *cmd,...)
|
|
{
|
|
int argc;
|
|
const char *argv[MAX_ARGS + 1];
|
|
const char *arg;
|
|
va_list param;
|
|
|
|
va_start(param, cmd);
|
|
argv[0] = cmd;
|
|
argc = 1;
|
|
while (argc < MAX_ARGS) {
|
|
arg = argv[argc++] = va_arg(param, char *);
|
|
if (!arg)
|
|
break;
|
|
}
|
|
va_end(param);
|
|
if (MAX_ARGS <= argc)
|
|
return error("too many args to run %s", cmd);
|
|
|
|
argv[argc] = NULL;
|
|
return execv_git_cmd(argv);
|
|
}
|