merge-recursive: fix leaking rename conflict info
[git/gitster.git] / exec-cmd.c
blob909777f61f4fa3d9d8c51c25db96e8d1f30544ae
1 #include "git-compat-util.h"
2 #include "abspath.h"
3 #include "environment.h"
4 #include "exec-cmd.h"
5 #include "gettext.h"
6 #include "path.h"
7 #include "run-command.h"
8 #include "strvec.h"
9 #include "trace.h"
10 #include "trace2.h"
12 #if defined(RUNTIME_PREFIX)
14 #if defined(HAVE_NS_GET_EXECUTABLE_PATH)
15 #include <mach-o/dyld.h>
16 #endif
18 #if defined(HAVE_BSD_KERN_PROC_SYSCTL)
19 #include <sys/param.h>
20 #include <sys/types.h>
21 #include <sys/sysctl.h>
22 #endif
24 #endif /* RUNTIME_PREFIX */
26 #define MAX_ARGS 32
28 static const char *system_prefix(void);
30 #ifdef RUNTIME_PREFIX
32 /**
33 * When using a runtime prefix, Git dynamically resolves paths relative to its
34 * executable.
36 * The method for determining the path of the executable is highly
37 * platform-specific.
40 /**
41 * Path to the current Git executable. Resolved on startup by
42 * 'git_resolve_executable_dir'.
44 static const char *executable_dirname;
46 static const char *system_prefix(void)
48 static const char *prefix;
50 assert(executable_dirname);
51 assert(is_absolute_path(executable_dirname));
53 if (!prefix &&
54 !(prefix = strip_path_suffix(executable_dirname, GIT_EXEC_PATH)) &&
55 !(prefix = strip_path_suffix(executable_dirname, BINDIR)) &&
56 !(prefix = strip_path_suffix(executable_dirname, "git"))) {
57 prefix = FALLBACK_RUNTIME_PREFIX;
58 trace_printf("RUNTIME_PREFIX requested, "
59 "but prefix computation failed. "
60 "Using static fallback '%s'.\n", prefix);
62 return prefix;
66 * Resolves the executable path from argv[0], only if it is absolute.
68 * Returns 0 on success, -1 on failure.
70 static int git_get_exec_path_from_argv0(struct strbuf *buf, const char *argv0)
72 const char *slash;
74 if (!argv0 || !*argv0)
75 return -1;
77 slash = find_last_dir_sep(argv0);
78 if (slash) {
79 trace_printf("trace: resolved executable path from argv0: %s\n",
80 argv0);
81 strbuf_add_absolute_path(buf, argv0);
82 return 0;
84 return -1;
87 #ifdef PROCFS_EXECUTABLE_PATH
89 * Resolves the executable path by examining a procfs symlink.
91 * Returns 0 on success, -1 on failure.
93 static int git_get_exec_path_procfs(struct strbuf *buf)
95 if (strbuf_realpath(buf, PROCFS_EXECUTABLE_PATH, 0)) {
96 trace_printf(
97 "trace: resolved executable path from procfs: %s\n",
98 buf->buf);
99 return 0;
101 return -1;
103 #endif /* PROCFS_EXECUTABLE_PATH */
105 #ifdef HAVE_BSD_KERN_PROC_SYSCTL
107 * Resolves the executable path using KERN_PROC_PATHNAME BSD sysctl.
109 * Returns 0 on success, -1 on failure.
111 static int git_get_exec_path_bsd_sysctl(struct strbuf *buf)
113 int mib[4];
114 char path[MAXPATHLEN];
115 size_t cb = sizeof(path);
117 mib[0] = CTL_KERN;
118 mib[1] = KERN_PROC;
119 mib[2] = KERN_PROC_PATHNAME;
120 mib[3] = -1;
121 if (!sysctl(mib, 4, path, &cb, NULL, 0)) {
122 trace_printf(
123 "trace: resolved executable path from sysctl: %s\n",
124 path);
125 strbuf_addstr(buf, path);
126 return 0;
128 return -1;
130 #endif /* HAVE_BSD_KERN_PROC_SYSCTL */
132 #ifdef HAVE_NS_GET_EXECUTABLE_PATH
134 * Resolves the executable path by querying Darwin application stack.
136 * Returns 0 on success, -1 on failure.
138 static int git_get_exec_path_darwin(struct strbuf *buf)
140 char path[PATH_MAX];
141 uint32_t size = sizeof(path);
142 if (!_NSGetExecutablePath(path, &size)) {
143 trace_printf(
144 "trace: resolved executable path from Darwin stack: %s\n",
145 path);
146 strbuf_addstr(buf, path);
147 return 0;
149 return -1;
151 #endif /* HAVE_NS_GET_EXECUTABLE_PATH */
153 #ifdef HAVE_WPGMPTR
155 * Resolves the executable path by using the global variable _wpgmptr.
157 * Returns 0 on success, -1 on failure.
159 static int git_get_exec_path_wpgmptr(struct strbuf *buf)
161 int len = wcslen(_wpgmptr) * 3 + 1;
162 strbuf_grow(buf, len);
163 len = xwcstoutf(buf->buf, _wpgmptr, len);
164 if (len < 0)
165 return -1;
166 buf->len += len;
167 return 0;
169 #endif /* HAVE_WPGMPTR */
172 * Resolves the absolute path of the current executable.
174 * Returns 0 on success, -1 on failure.
176 static int git_get_exec_path(struct strbuf *buf, const char *argv0)
179 * Identifying the executable path is operating system specific.
180 * Selectively employ all available methods in order of preference,
181 * preferring highly-available authoritative methods over
182 * selectively-available or non-authoritative methods.
184 * All cases fall back on resolving against argv[0] if there isn't a
185 * better functional method. However, note that argv[0] can be
186 * used-supplied on many operating systems, and is not authoritative
187 * in those cases.
189 * Each of these functions returns 0 on success, so evaluation will stop
190 * after the first successful method.
192 if (
193 #ifdef HAVE_BSD_KERN_PROC_SYSCTL
194 git_get_exec_path_bsd_sysctl(buf) &&
195 #endif /* HAVE_BSD_KERN_PROC_SYSCTL */
197 #ifdef HAVE_NS_GET_EXECUTABLE_PATH
198 git_get_exec_path_darwin(buf) &&
199 #endif /* HAVE_NS_GET_EXECUTABLE_PATH */
201 #ifdef PROCFS_EXECUTABLE_PATH
202 git_get_exec_path_procfs(buf) &&
203 #endif /* PROCFS_EXECUTABLE_PATH */
205 #ifdef HAVE_WPGMPTR
206 git_get_exec_path_wpgmptr(buf) &&
207 #endif /* HAVE_WPGMPTR */
209 git_get_exec_path_from_argv0(buf, argv0)) {
210 return -1;
213 if (strbuf_normalize_path(buf)) {
214 trace_printf("trace: could not normalize path: %s\n", buf->buf);
215 return -1;
218 trace2_cmd_path(buf->buf);
220 return 0;
223 void git_resolve_executable_dir(const char *argv0)
225 struct strbuf buf = STRBUF_INIT;
226 char *resolved;
227 const char *slash;
229 if (git_get_exec_path(&buf, argv0)) {
230 trace_printf(
231 "trace: could not determine executable path from: %s\n",
232 argv0);
233 strbuf_release(&buf);
234 return;
237 resolved = strbuf_detach(&buf, NULL);
238 slash = find_last_dir_sep(resolved);
239 if (slash)
240 resolved[slash - resolved] = '\0';
242 executable_dirname = resolved;
243 trace_printf("trace: resolved executable dir: %s\n",
244 executable_dirname);
247 #else
250 * When not using a runtime prefix, Git uses a hard-coded path.
252 static const char *system_prefix(void)
254 return FALLBACK_RUNTIME_PREFIX;
258 * This is called during initialization, but No work needs to be done here when
259 * runtime prefix is not being used.
261 void git_resolve_executable_dir(const char *argv0 UNUSED)
265 #endif /* RUNTIME_PREFIX */
267 char *system_path(const char *path)
269 struct strbuf d = STRBUF_INIT;
271 if (is_absolute_path(path))
272 return xstrdup(path);
274 strbuf_addf(&d, "%s/%s", system_prefix(), path);
275 return strbuf_detach(&d, NULL);
278 static const char *exec_path_value;
280 void git_set_exec_path(const char *exec_path)
282 exec_path_value = exec_path;
284 * Propagate this setting to external programs.
286 setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1);
289 /* Returns the highest-priority location to look for git programs. */
290 const char *git_exec_path(void)
292 if (!exec_path_value) {
293 const char *env = getenv(EXEC_PATH_ENVIRONMENT);
294 if (env && *env)
295 exec_path_value = xstrdup(env);
296 else
297 exec_path_value = system_path(GIT_EXEC_PATH);
299 return exec_path_value;
302 static void add_path(struct strbuf *out, const char *path)
304 if (path && *path) {
305 strbuf_add_absolute_path(out, path);
306 strbuf_addch(out, PATH_SEP);
310 void setup_path(void)
312 const char *exec_path = git_exec_path();
313 const char *old_path = getenv("PATH");
314 struct strbuf new_path = STRBUF_INIT;
316 git_set_exec_path(exec_path);
317 add_path(&new_path, exec_path);
319 if (old_path)
320 strbuf_addstr(&new_path, old_path);
321 else
322 strbuf_addstr(&new_path, _PATH_DEFPATH);
324 setenv("PATH", new_path.buf, 1);
326 strbuf_release(&new_path);
329 const char **prepare_git_cmd(struct strvec *out, const char **argv)
331 strvec_push(out, "git");
332 strvec_pushv(out, argv);
333 return out->v;
336 int execv_git_cmd(const char **argv)
338 struct strvec nargv = STRVEC_INIT;
340 prepare_git_cmd(&nargv, argv);
341 trace_argv_printf(nargv.v, "trace: exec:");
343 /* execvp() can only ever return if it fails */
344 sane_execvp("git", (char **)nargv.v);
346 trace_printf("trace: exec failed: %s\n", strerror(errno));
348 strvec_clear(&nargv);
349 return -1;
352 int execl_git_cmd(const char *cmd, ...)
354 int argc;
355 const char *argv[MAX_ARGS + 1];
356 const char *arg;
357 va_list param;
359 va_start(param, cmd);
360 argv[0] = cmd;
361 argc = 1;
362 while (argc < MAX_ARGS) {
363 arg = argv[argc++] = va_arg(param, char *);
364 if (!arg)
365 break;
367 va_end(param);
368 if (MAX_ARGS <= argc)
369 return error(_("too many args to run %s"), cmd);
371 argv[argc] = NULL;
372 return execv_git_cmd(argv);