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1 | #include "cache.h" | |
2 | #include "exec_cmd.h" | |
3 | #include "quote.h" | |
4 | #define MAX_ARGS 32 | |
5 | ||
6 | static const char *argv_exec_path; | |
7 | static const char *argv0_path; | |
8 | ||
9 | const char *system_path(const char *path) | |
10 | { | |
11 | #ifdef RUNTIME_PREFIX | |
12 | static const char *prefix; | |
13 | #else | |
14 | static const char *prefix = PREFIX; | |
15 | #endif | |
16 | struct strbuf d = STRBUF_INIT; | |
17 | ||
18 | if (is_absolute_path(path)) | |
19 | return path; | |
20 | ||
21 | #ifdef RUNTIME_PREFIX | |
22 | assert(argv0_path); | |
23 | assert(is_absolute_path(argv0_path)); | |
24 | ||
25 | if (!prefix && | |
26 | !(prefix = strip_path_suffix(argv0_path, GIT_EXEC_PATH)) && | |
27 | !(prefix = strip_path_suffix(argv0_path, BINDIR)) && | |
28 | !(prefix = strip_path_suffix(argv0_path, "git"))) { | |
29 | prefix = PREFIX; | |
30 | trace_printf("RUNTIME_PREFIX requested, " | |
31 | "but prefix computation failed. " | |
32 | "Using static fallback '%s'.\n", prefix); | |
33 | } | |
34 | #endif | |
35 | ||
36 | strbuf_addf(&d, "%s/%s", prefix, path); | |
37 | path = strbuf_detach(&d, NULL); | |
38 | return path; | |
39 | } | |
40 | ||
41 | const char *git_extract_argv0_path(const char *argv0) | |
42 | { | |
43 | const char *slash; | |
44 | ||
45 | if (!argv0 || !*argv0) | |
46 | return NULL; | |
47 | slash = argv0 + strlen(argv0); | |
48 | ||
49 | while (argv0 <= slash && !is_dir_sep(*slash)) | |
50 | slash--; | |
51 | ||
52 | if (slash >= argv0) { | |
53 | argv0_path = xstrndup(argv0, slash - argv0); | |
54 | return slash + 1; | |
55 | } | |
56 | ||
57 | return argv0; | |
58 | } | |
59 | ||
60 | void git_set_argv_exec_path(const char *exec_path) | |
61 | { | |
62 | argv_exec_path = exec_path; | |
63 | /* | |
64 | * Propagate this setting to external programs. | |
65 | */ | |
66 | setenv(EXEC_PATH_ENVIRONMENT, exec_path, 1); | |
67 | } | |
68 | ||
69 | ||
70 | /* Returns the highest-priority, location to look for git programs. */ | |
71 | const char *git_exec_path(void) | |
72 | { | |
73 | const char *env; | |
74 | ||
75 | if (argv_exec_path) | |
76 | return argv_exec_path; | |
77 | ||
78 | env = getenv(EXEC_PATH_ENVIRONMENT); | |
79 | if (env && *env) { | |
80 | return env; | |
81 | } | |
82 | ||
83 | return system_path(GIT_EXEC_PATH); | |
84 | } | |
85 | ||
86 | static void add_path(struct strbuf *out, const char *path) | |
87 | { | |
88 | if (path && *path) { | |
89 | if (is_absolute_path(path)) | |
90 | strbuf_addstr(out, path); | |
91 | else | |
92 | strbuf_addstr(out, absolute_path(path)); | |
93 | ||
94 | strbuf_addch(out, PATH_SEP); | |
95 | } | |
96 | } | |
97 | ||
98 | void setup_path(void) | |
99 | { | |
100 | const char *old_path = getenv("PATH"); | |
101 | struct strbuf new_path = STRBUF_INIT; | |
102 | ||
103 | add_path(&new_path, git_exec_path()); | |
104 | add_path(&new_path, argv0_path); | |
105 | ||
106 | if (old_path) | |
107 | strbuf_addstr(&new_path, old_path); | |
108 | else | |
109 | strbuf_addstr(&new_path, _PATH_DEFPATH); | |
110 | ||
111 | setenv("PATH", new_path.buf, 1); | |
112 | ||
113 | strbuf_release(&new_path); | |
114 | } | |
115 | ||
116 | const char **prepare_git_cmd(const char **argv) | |
117 | { | |
118 | int argc; | |
119 | const char **nargv; | |
120 | ||
121 | for (argc = 0; argv[argc]; argc++) | |
122 | ; /* just counting */ | |
123 | nargv = xmalloc(sizeof(*nargv) * (argc + 2)); | |
124 | ||
125 | nargv[0] = "git"; | |
126 | for (argc = 0; argv[argc]; argc++) | |
127 | nargv[argc + 1] = argv[argc]; | |
128 | nargv[argc + 1] = NULL; | |
129 | return nargv; | |
130 | } | |
131 | ||
132 | int execv_git_cmd(const char **argv) { | |
133 | const char **nargv = prepare_git_cmd(argv); | |
134 | trace_argv_printf(nargv, "trace: exec:"); | |
135 | ||
136 | /* execvp() can only ever return if it fails */ | |
137 | execvp("git", (char **)nargv); | |
138 | ||
139 | trace_printf("trace: exec failed: %s\n", strerror(errno)); | |
140 | ||
141 | free(nargv); | |
142 | return -1; | |
143 | } | |
144 | ||
145 | ||
146 | int execl_git_cmd(const char *cmd,...) | |
147 | { | |
148 | int argc; | |
149 | const char *argv[MAX_ARGS + 1]; | |
150 | const char *arg; | |
151 | va_list param; | |
152 | ||
153 | va_start(param, cmd); | |
154 | argv[0] = cmd; | |
155 | argc = 1; | |
156 | while (argc < MAX_ARGS) { | |
157 | arg = argv[argc++] = va_arg(param, char *); | |
158 | if (!arg) | |
159 | break; | |
160 | } | |
161 | va_end(param); | |
162 | if (MAX_ARGS <= argc) | |
163 | return error("too many args to run %s", cmd); | |
164 | ||
165 | argv[argc] = NULL; | |
166 | return execv_git_cmd(argv); | |
167 | } |