languages/cpython
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Issue #17903: Added path search changes to launcher.

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This commit is contained in:
Vinay Sajip 2013-06-07 15:37:28 +01:00
parent 30298b468b
commit 22c039bf50
1 changed files with 41 additions and 15 deletions
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56
PC/launcher.c
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@ -1,5 +1,5 @@
/*
* Copyright (C) 2011-2012 Vinay Sajip.
* Copyright (C) 2011-2013 Vinay Sajip.
* Licensed to PSF under a contributor agreement.
*
* Based on the work of:
@ -18,7 +18,7 @@
/* Build options. */
#define SKIP_PREFIX
/* #define SEARCH_PATH */
#define SEARCH_PATH
/* Just for now - static definition */
@ -595,12 +595,17 @@ invoke_child(wchar_t * executable, wchar_t * suffix, wchar_t * cmdline)
}
}
static wchar_t * builtin_virtual_paths [] = {
L"/usr/bin/env python",
L"/usr/bin/python",
L"/usr/local/bin/python",
L"python",
NULL
typedef struct {
wchar_t *shebang;
BOOL search;
} SHEBANG;
static SHEBANG builtin_virtual_paths [] = {
{ L"/usr/bin/env python", TRUE },
{ L"/usr/bin/python", FALSE },
{ L"/usr/local/bin/python", FALSE },
{ L"python", FALSE },
{ NULL, FALSE },
};
/* For now, a static array of commands. */
@ -776,10 +781,10 @@ static void read_commands()
static BOOL
parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
wchar_t ** suffix)
wchar_t ** suffix, BOOL *search)
{
BOOL rc = FALSE;
wchar_t ** vpp;
SHEBANG * vpp;
size_t plen;
wchar_t * p;
wchar_t zapped;
@ -789,15 +794,17 @@ parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
*command = NULL; /* failure return */
*suffix = NULL;
*search = FALSE;
if ((*shebang_line++ == L'#') && (*shebang_line++ == L'!')) {
shebang_line = skip_whitespace(shebang_line);
if (*shebang_line) {
*command = shebang_line;
for (vpp = builtin_virtual_paths; *vpp; ++vpp) {
plen = wcslen(*vpp);
if (wcsncmp(shebang_line, *vpp, plen) == 0) {
for (vpp = builtin_virtual_paths; vpp->shebang; ++vpp) {
plen = wcslen(vpp->shebang);
if (wcsncmp(shebang_line, vpp->shebang, plen) == 0) {
rc = TRUE;
*search = vpp->search;
/* We can do this because all builtin commands contain
* "python".
*/
@ -805,7 +812,7 @@ parse_shebang(wchar_t * shebang_line, int nchars, wchar_t ** command,
break;
}
}
if (*vpp == NULL) {
if (vpp->shebang == NULL) {
/*
* Not found in builtins - look in customised commands.
*
@ -1012,8 +1019,10 @@ maybe_handle_shebang(wchar_t ** argv, wchar_t * cmdline)
int i, j, nchars = 0;
int header_len;
BOOL is_virt;
BOOL search;
wchar_t * command;
wchar_t * suffix;
COMMAND *cmd = NULL;
INSTALLED_PYTHON * ip;
if (rc == 0) {
@ -1125,7 +1134,7 @@ of bytes: %d\n", header_len);
if (nchars > 0) {
shebang_line[--nchars] = L'\0';
is_virt = parse_shebang(shebang_line, nchars, &command,
&suffix);
&suffix, &search);
if (command != NULL) {
debug(L"parse_shebang: found command: %s\n", command);
if (!is_virt) {
@ -1141,6 +1150,23 @@ of bytes: %d\n", header_len);
error(RC_BAD_VIRTUAL_PATH, L"Unknown virtual \
path '%s'", command);
command += 6; /* skip past "python" */
if (search && ((*command == L'\0') || isspace(*command))) {
/* Command is eligible for path search, and there
* is no version specification.
*/
debug(L"searching PATH for python executable\n");
cmd = find_on_path(L"python");
debug(L"Python on path: %s\n", cmd ? cmd->value : L"<not found>");
if (cmd) {
debug(L"located python on PATH: %s\n", cmd->value);
invoke_child(cmd->value, suffix, cmdline);
/* Exit here, as we have found the command */
return;
}
/* FALL THROUGH: No python found on PATH, so fall
* back to locating the correct installed python.
*/
}
if (*command && !validate_version(command))
error(RC_BAD_VIRTUAL_PATH, L"Invalid version \
specification: '%s'.\nIn the first line of the script, 'python' needs to be \