This adds new command-line options to facilitate different file locations at
compile-time versus run-time when generating stap kernel modules for a remote
system:
1. --sysroot=DIR
Specifies a separate filesystem for the remote system on the local
system. The following stap functionalities will make use of this:
a. When compiling process and library probes with a remote filesystem path
(e.g. process("/bin/foo") with --sysroot=/bar/baz). In this case symbols
will be taken from the local filesystem (/bar/baz/bin/foo), but the
resulting .ko will still contain paths on the remote filesystem
(/bin/foo).
b. When passing a kernel release with -r (not a full path), the kernel
build directory will be expected in the sysroot.
c. When DWARF debug info is contained in a separate file from the
executable, the sysroot is used to find the debug info files.
d. All calls to find_executable() search the path passed in the
argument env_path relative to the sysroot. For example if
PATH=/bin/foo, and --sysroot=/bar/baz is provided, then
find_executable() called with env_path == "PATH" will search
/bar/baz/bin/foo.
e. stap attempts to detect if a path in a probe would be outside of the
sysroot and errors appropriately. This situation may occur, for
example, if the path contains several ".." directories.
2. --sysenv=VAR=VALUE
Specifies a different environment variable for the remote system as opposed
to the local one, and that the value on the remote system should be used.
Currently only valid env_path arguments to find_executable() are handled
(i.e. PATH, LD_LIBRARY_PATH). If --sysroot is provided and --sysenv
is omitted, then the local environment relative to the sysroot will
be used.
These options are disabled for systemtap clients.
Signed-off-by: Wade Farnsworth<wade_farnsworth@mentor.com>
---
Josh, I believe I have implemented all of your comments on the previous version
of this patch. Any further suggestions are welcome!
-v2: Implemented several improvements per Josh Stone's comment.
cmdline.cxx | 2 +
cmdline.h | 2 +
dwflpp.cxx | 4 +-
hash.cxx | 3 +-
session.cxx | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
session.h | 3 ++
setupdwfl.cxx | 39 ++++++++++++++++++++++++++----
setupdwfl.h | 3 +-
tapset-itrace.cxx | 5 +++-
tapset-utrace.cxx | 5 +++-
tapsets.cxx | 64 ++++++++++++++++++++++++++++++++++++++------------
translate.cxx | 6 ++--
util.cxx | 28 +++++++++++++++++----
util.h | 3 ++
14 files changed, 197 insertions(+), 37 deletions(-)
diff --git a/cmdline.cxx b/cmdline.cxx
index 88e02f9..881a5c3 100644
--- a/cmdline.cxx
+++ b/cmdline.cxx
@@ -50,5 +50,7 @@ struct option stap_long_options[] = {
{ "privilege", 1,&stap_long_opt, LONG_OPT_PRIVILEGE },
{ "suppress-handler-errors", 0,&stap_long_opt, LONG_OPT_SUPPRESS_HANDLER_ERRORS },
{ "modinfo", 1,&stap_long_opt, LONG_OPT_MODINFO },
+ { "sysroot", 1,&stap_long_opt, LONG_OPT_SYSROOT },
+ { "sysenv", 1,&stap_long_opt, LONG_OPT_SYSENV },
{ NULL, 0, NULL, 0 }
};
diff --git a/cmdline.h b/cmdline.h
index 3229a7b..680f290 100644
--- a/cmdline.h
+++ b/cmdline.h
@@ -44,6 +44,8 @@ extern "C" {
#define LONG_OPT_PRIVILEGE 28
#define LONG_OPT_SUPPRESS_HANDLER_ERRORS 29
#define LONG_OPT_MODINFO 30
+#define LONG_OPT_SYSROOT 31
+#define LONG_OPT_SYSENV 32
// NB: when adding new options, consider very carefully whether they
// should be restricted from stap clients (after --client-options)!
diff --git a/dwflpp.cxx b/dwflpp.cxx
index 4d78187..17fd5c6 100644
--- a/dwflpp.cxx
+++ b/dwflpp.cxx
@@ -321,7 +321,7 @@ dwflpp::setup_kernel(const string& name, systemtap_session& s, bool debuginfo_n
{
if (debuginfo_needed) {
// Suggest a likely kernel dir to find debuginfo rpm for
- string dir = string("/lib/modules/" + sess.kernel_release );
+ string dir = string(sess.sysroot + "/lib/modules/" + sess.kernel_release );
find_debug_rpms(sess, dir.c_str());
}
throw semantic_error (_F("missing %s kernel/module debuginfo under '%s'",
@@ -359,7 +359,7 @@ dwflpp::setup_kernel(const vector<string> &names, bool debuginfo_needed)
{
if (debuginfo_needed) {
// Suggest a likely kernel dir to find debuginfo rpm for
- string dir = string("/lib/modules/" + sess.kernel_release );
+ string dir = string(sess.sysroot + "/lib/modules/" + sess.kernel_release );
find_debug_rpms(sess, dir.c_str());
}
throw semantic_error (_F("missing %s kernel/module debuginfo under '%s'",
diff --git a/hash.cxx b/hash.cxx
index c435a03..69334f5 100644
--- a/hash.cxx
+++ b/hash.cxx
@@ -133,6 +133,7 @@ void create_hash_log(const string&type_str, const string&parms, const string&
static const hash&
get_base_hash (systemtap_session& s)
{
+ map<string, char*> dummy;
if (s.base_hash)
return *s.base_hash;
@@ -158,7 +159,7 @@ get_base_hash (systemtap_session& s)
// Hash compiler path, size, and mtime. We're just going to assume
// we'll be using gcc. XXX: getting kbuild to spit out out would be
// better, especially since this is fooled by ccache.
- h.add_path("Compiler ", find_executable("gcc"));
+ h.add_path("Compiler ", find_executable("gcc", "", dummy));
// Hash the systemtap size and mtime. We could use VERSION/DATE,
// but when developing systemtap that doesn't work well (since you
diff --git a/session.cxx b/session.cxx
index 24c329a..2c5be33 100644
--- a/session.cxx
+++ b/session.cxx
@@ -20,6 +20,7 @@
#include "util.h"
#include "cmdline.h"
#include "git_version.h"
+#include "setupdwfl.h"
#include<cerrno>
#include<cstdlib>
@@ -86,6 +87,8 @@ systemtap_session::systemtap_session ():
kernel_release = string (buf.release);
release = kernel_release;
kernel_build_tree = "/lib/modules/" + kernel_release + "/build";
+ sysroot = "";
+ update_release_sysroot = false;
architecture = machine = normalize_machine(buf.machine);
for (unsigned i=0; i<5; i++) perpass_verbose[i]=0;
@@ -533,6 +536,13 @@ systemtap_session::usage (int exitcode)
" yes,no,ask,<timeout value>\n"
" --dump-probe-types\n"
" show a list of available probe types.\n"
+ " --sysroot=DIR\n"
+ " specify sysroot directory where executables are located.\n"
+ " --sysenv=VAR=VALUE\n"
+ " provide an alternate value for an environment variable\n"
+ " where the value on a remote system differs. Path\n"
+ " variables (e.g. PATH, LD_LIBRARY_PATH) are assumed to be\n"
+ " relatve to the sysroot.\n"
, compatible.c_str())<< endl
;
@@ -1097,6 +1107,56 @@ systemtap_session::parse_cmdline (int argc, char * const argv [])
modinfos.push_back (string(optarg));
break;
+ case LONG_OPT_SYSROOT:
+ if (client_options) {
+ cerr<< _F("ERROR: %s invalid with %s", "--sysroot", "--client-options")<< endl;
+ return 1;
+ } else {
+ const char *spath = canonicalize_file_name (optarg);
+ if (spath == NULL) {
+ cerr<< _F("ERROR: %s is an invalid directory for --sysroot", optarg)<< endl;
+ return 1;
+ }
+
+ sysroot = string(spath);
+ if (sysroot[sysroot.size() - 1] != '/')
+ sysroot.append("/");
+
+ if (update_release_sysroot)
+ kernel_build_tree = sysroot + kernel_build_tree;
+
+ debuginfo_path_insert_sysroot(sysroot);
+
+ break;
+ }
+ case LONG_OPT_SYSENV:
+ if (client_options) {
+ cerr<< _F("ERROR: %s invalid with %s", "--sysenv", "--client-options")<< endl;
+ return 1;
+ } else {
+ string sysenv_str = optarg;
+ string value_str;
+ char * value;
+ size_t pos;
+ if (sysroot.empty()) {
+ cerr<< "ERROR: --sysenv must follow --sysroot"<< endl;
+ return 1;
+ }
+
+ pos = sysenv_str.find("=");
+ if (pos == string::npos) {
+ cerr<< _F("ERROR: %s is an invalid argument for --sysenv", optarg)<< endl;
+ return 1;
+ }
+
+ value_str = sysenv_str.substr(pos + 1);
+ value = new char[value_str.size()+1];
+ strcpy(value, value_str.c_str());
+ sysenv[sysenv_str.substr(0, pos)] = value;
+
+ break;
+ }
+
default:
// NOTREACHED unless one added a getopt option but not a corresponding switch/case:
cerr<< _F("Unhandled long argument id %d", stap_long_opt)<< endl;
@@ -1387,8 +1447,13 @@ systemtap_session::setup_kernel_release (const char* kstr)
else
{
kernel_release = string (kstr);
- if (!kernel_release.empty())
+ if (!kernel_release.empty()) {
kernel_build_tree = "/lib/modules/" + kernel_release + "/build";
+ if (sysroot.empty())
+ update_release_sysroot = true;
+ else
+ kernel_build_tree = sysroot + kernel_build_tree;
+ }
// PR10745
// Let's not look for the kernel_source_tree; it's definitely
diff --git a/session.h b/session.h
index e128b2f..b5b8d82 100644
--- a/session.h
+++ b/session.h
@@ -140,6 +140,9 @@ public:
std::string kernel_base_release;
std::string kernel_build_tree;
std::string kernel_source_tree;
+ std::string sysroot;
+ std::map<std::string,char *> sysenv;
+ bool update_release_sysroot;
std::map<std::string,std::string> kernel_config;
std::set<std::string> kernel_exports;
std::string machine;
diff --git a/setupdwfl.cxx b/setupdwfl.cxx
index 82bc42a..fbffaf0 100644
--- a/setupdwfl.cxx
+++ b/setupdwfl.cxx
@@ -39,14 +39,14 @@ extern "C" {
// XXX: also consider adding $HOME/.debug/ for perf build-id-cache
static const char *debuginfo_path_arr = "+:.debug:/usr/lib/debug:/var/cache/abrt-di/usr/lib/debug:build";
static const char *debuginfo_env_arr = getenv("SYSTEMTAP_DEBUGINFO_PATH");
-static const char *debuginfo_path = (debuginfo_env_arr ?: debuginfo_path_arr);
+static char *debuginfo_path = (char *)(debuginfo_env_arr ?: debuginfo_path_arr);
// NB: kernel_build_tree doesn't enter into this, as it's for
// kernel-side modules only.
// XXX: also consider adding $HOME/.debug/ for perf build-id-cache
static const char *debuginfo_usr_path_arr = "+:.debug:/usr/lib/debug:/var/cache/abrt-di/usr/lib/debug";
-static const char *debuginfo_usr_path = (debuginfo_env_arr
- ?: debuginfo_usr_path_arr);
+static char *debuginfo_usr_path = (char *)(debuginfo_env_arr
+ ?: debuginfo_usr_path_arr);
// A pointer to the current systemtap session for use only by a few
// dwfl calls. DO NOT rely on this, as it is cleared after use.
@@ -146,7 +146,10 @@ setup_mod_deps()
}
else
{
- modulesdep = "/lib/modules/";
+ string sysroot = "";
+ if (current_session_for_find_debuginfo)
+ sysroot = current_session_for_find_debuginfo->sysroot;
+ modulesdep = sysroot + "/lib/modules/";
modulesdep += elfutils_kernel_path;
modulesdep += "/modules.dep";
}
@@ -280,6 +283,30 @@ setup_dwfl_report_kernel_p(const char* modname, const char* filename)
}
}
+static char * path_insert_sysroot(string sysroot, string path)
+{
+ char * path_new;
+ size_t pos = 1;
+ if (path[0] == '/')
+ path.replace(0, 1, sysroot);
+ while (true) {
+ pos = path.find(":/", pos);
+ if (pos == string::npos)
+ break;
+ path.replace(pos, 2, ":" + sysroot);
+ ++pos;
+ }
+ path_new = new char[path.size()+1];
+ strcpy (path_new, path.c_str());
+ return path_new;
+}
+
+void debuginfo_path_insert_sysroot(string sysroot)
+{
+ debuginfo_path = path_insert_sysroot(sysroot, debuginfo_path);
+ debuginfo_usr_path = path_insert_sysroot(sysroot, debuginfo_usr_path);
+}
+
static DwflPtr
setup_dwfl_kernel (unsigned *modules_found, systemtap_session&s)
{
@@ -295,7 +322,7 @@ setup_dwfl_kernel (unsigned *modules_found, systemtap_session&s)
// no way to set the dwfl_callback.debuginfo_path and always
// passs the plain kernel_release here. So instead we have to
// hard-code this magic here.
- if (s.kernel_build_tree == string("/lib/modules/"
+ if (s.kernel_build_tree == string(s.sysroot + "/lib/modules/"
+ s.kernel_release
+ "/build"))
elfutils_kernel_path = s.kernel_release;
@@ -413,7 +440,7 @@ setup_dwfl_kernel(const std::set<std::string> &names,
}
DwflPtr
-setup_dwfl_user(const std::string&name)
+setup_dwfl_user(const std::string&name, systemtap_session&s)
{
if (user_dwfl != NULL
&& user_modset.size() == 1
diff --git a/setupdwfl.h b/setupdwfl.h
index 48f9105..4686574 100644
--- a/setupdwfl.h
+++ b/setupdwfl.h
@@ -50,7 +50,7 @@ DwflPtr setup_dwfl_kernel(const std::set<std::string> &names,
unsigned *found,
systemtap_session&s);
-DwflPtr setup_dwfl_user(const std::string&name);
+DwflPtr setup_dwfl_user(const std::string&name, systemtap_session&s);
DwflPtr setup_dwfl_user(std::vector<std::string>::const_iterator&begin,
const std::vector<std::string>::const_iterator&end,
bool all_needed, systemtap_session&s);
@@ -69,5 +69,6 @@ int internal_find_debuginfo (Dwfl_Module *mod,
int execute_abrt_action_install_debuginfo_to_abrt_cache (std::string hex);
std::string get_kernel_build_id (systemtap_session&s);
int download_kernel_debuginfo (systemtap_session&s, std::string hex);
+void debuginfo_path_insert_sysroot(std::string sysroot);
#endif
diff --git a/tapset-itrace.cxx b/tapset-itrace.cxx
index 1a9bf67..0e623fe 100644
--- a/tapset-itrace.cxx
+++ b/tapset-itrace.cxx
@@ -114,8 +114,11 @@ struct itrace_builder: public derived_probe_builder
// If we have a path, we need to validate it.
if (has_path)
{
- path = find_executable (path);
+ size_t pos;
+ path = find_executable (path, sess.sysroot, sess.sysenv);
sess.unwindsym_modules.insert (path);
+ if (!sess.sysroot.empty()&& ((pos = path.find(sess.sysroot)) != string::npos))
+ path.replace(pos, sess.sysroot.length(), "/");
}
finished_results.push_back(new itrace_derived_probe(sess, base, location,
diff --git a/tapset-utrace.cxx b/tapset-utrace.cxx
index 64ba900..133d42a 100644
--- a/tapset-utrace.cxx
+++ b/tapset-utrace.cxx
@@ -679,8 +679,11 @@ struct utrace_builder: public derived_probe_builder
}
else if (has_path)
{
- path = find_executable (path);
+ size_t pos;
+ path = find_executable (path, sess.sysroot, sess.sysenv);
sess.unwindsym_modules.insert (path);
+ if (!sess.sysroot.empty()&& ((pos = path.find(sess.sysroot)) != string::npos))
+ path.replace(pos, sess.sysroot.length(), "/");
}
else if (has_pid)
{
diff --git a/tapsets.cxx b/tapsets.cxx
index cb56170..6cdb8e1 100644
--- a/tapsets.cxx
+++ b/tapsets.cxx
@@ -584,13 +584,14 @@ base_query::base_query(dwflpp& dw, literal_map_t const& params):
has_statement = get_number_param(params, TOK_STATEMENT, statement_num_val);
if (has_process)
- module_val = find_executable (module_val);
+ module_val = find_executable (module_val, sess.sysroot, sess.sysenv);
if (has_library)
{
if (! contains_glob_chars (library_name))
{
path = module_val;
- module_val = find_executable (library_name, "LD_LIBRARY_PATH");
+ module_val = find_executable (library_name, sess.sysroot,
+ sess.sysenv, "LD_LIBRARY_PATH");
}
else
path = library_name;
@@ -1137,7 +1138,7 @@ dwarf_query::add_probe_point(const string& dw_funcname,
{
string reloc_section; // base section for relocation purposes
Dwarf_Addr reloc_addr; // relocated
- const string& module = dw.module_name; // "kernel" or other
+ string& module = dw.module_name; // "kernel" or other
string funcname = dw_funcname;
assert (! has_absolute); // already handled in dwarf_builder::build()
@@ -1188,6 +1189,14 @@ dwarf_query::add_probe_point(const string& dw_funcname,
if (has_process)
{
+ if (!sess.sysroot.empty())
+ {
+ size_t pos;
+ if ((pos = module.find(sess.sysroot)) != string::npos)
+ module.replace(pos, sess.sysroot.length(), "/");
+ if ((pos = path.find(sess.sysroot)) != string::npos)
+ path.replace(pos, sess.sysroot.length(), "/");
+ }
results.push_back (new uprobe_derived_probe(funcname, filename, line,
module, reloc_section, addr, reloc_addr,
*this, scope_die));
@@ -2051,7 +2060,8 @@ query_one_library (const char *library, dwflpp& dw,
{
if (dw.function_name_matches_pattern(library, user_lib))
{
- string library_path = find_executable (library, "LD_LIBRARY_PATH");
+ string library_path = find_executable (library, "", dw.sess.sysenv,
+ "LD_LIBRARY_PATH");
probe_point* specific_loc = new probe_point(*base_loc);
specific_loc->optional = true;
vector<probe_point::component*> derived_comps;
@@ -3906,7 +3916,7 @@ void dwarf_cast_expanding_visitor::visit_cast_op (cast_op* e)
}
else
{
- module = find_executable (module); // canonicalize it
+ module = find_executable (module, "", s.sysenv); // canonicalize it
dw = db.get_user_dw(s, module);
}
}
@@ -6546,13 +6556,14 @@ dwarf_builder::build(systemtap_session& sess,
}
else if (get_param (parameters, TOK_PROCESS, module_name) || has_null_param(parameters, TOK_PROCESS))
{
+ module_name = sess.sysroot + module_name;
if(has_null_param(filled_parameters, TOK_PROCESS))
{
wordexp_t words;
int rc = wordexp(sess.cmd.c_str(),&words, WRDE_NOCMD|WRDE_UNDEF);
if(rc || words.we_wordc<= 0)
throw semantic_error(_("unspecified process probe is invalid without a -c COMMAND"));
- module_name = words.we_wordv[0];
+ module_name = sess.sysroot + words.we_wordv[0];
filled_parameters[TOK_PROCESS] = new literal_string(module_name);// this needs to be used in place of the blank map
// in the case of TOK_MARK we need to modify locations as well
if(location->components[0]->functor==TOK_PROCESS&&
@@ -6605,9 +6616,15 @@ dwarf_builder::build(systemtap_session& sess,
if (sess.verbose> 1)
clog<< _F("Expanded process(\"%s\") to process(\"%s\")",
module_name.c_str(), eglobbed.c_str())<< endl;
+ if (!sess.sysroot.empty())
+ {
+ size_t pos;
+ if ((pos = eglobbed.find(sess.sysroot)) != string::npos)
+ eglobbed.replace(pos, sess.sysroot.length(), "/");
+ }
probe_point::component* ppc = new probe_point::component (TOK_PROCESS,
- new literal_string (eglobbed));
+ new literal_string (eglobbed));
ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above
pp->components[0] = ppc;
@@ -6633,7 +6650,7 @@ dwarf_builder::build(systemtap_session& sess,
// PR13338: unquote glob results
module_name = unescape_glob_chars (module_name);
- user_path = find_executable (module_name); // canonicalize it
+ user_path = find_executable (module_name, "", sess.sysenv); // canonicalize it
// if the executable starts with "#!", we look for the interpreter of the script
{
@@ -6679,12 +6696,13 @@ dwarf_builder::build(systemtap_session& sess,
if (p3 != string::npos)
{
string env_path = path.substr(p3);
- user_path = find_executable (env_path);
+ user_path = find_executable (env_path, sess.sysroot,
+ sess.sysenv);
}
}
else
{
- user_path = find_executable (path);
+ user_path = find_executable (path, sess.sysroot, sess.sysenv);
}
struct stat st;
@@ -6705,8 +6723,12 @@ dwarf_builder::build(systemtap_session& sess,
// synthesize a new probe_point, with the expanded string
probe_point *pp = new probe_point (*location);
+ string user_path_tgt = user_path;
+ size_t pos;
+ if (!sess.sysroot.empty()&& ((pos = path.find(sess.sysroot)) != string::npos))
+ user_path_tgt.replace(pos, sess.sysroot.length(), "/");
probe_point::component* ppc = new probe_point::component (TOK_PROCESS,
- new literal_string (user_path.c_str()));
+ new literal_string (user_path_tgt.c_str()));
ppc->tok = location->components[0]->tok; // overwrite [0] slot, pattern matched above
pp->components[0] = ppc;
@@ -6725,7 +6747,8 @@ dwarf_builder::build(systemtap_session& sess,
if(get_param (parameters, TOK_LIBRARY, user_lib)
&& user_lib.length()&& ! contains_glob_chars (user_lib))
- module_name = find_executable (user_lib, "LD_LIBRARY_PATH");
+ module_name = find_executable (user_lib, sess.sysroot, sess.sysenv,
+ "LD_LIBRARY_PATH");
else
module_name = user_path; // canonicalize it
@@ -8189,7 +8212,7 @@ struct kprobe_builder: public derived_probe_builder
void
-kprobe_builder::build(systemtap_session&,
+kprobe_builder::build(systemtap_session& sess,
probe * base,
probe_point * location,
literal_map_t const& parameters,
@@ -8212,9 +8235,20 @@ kprobe_builder::build(systemtap_session&,
has_library = get_param (parameters, TOK_LIBRARY, library);
if (has_path)
- path = find_executable (path);
+ {
+ size_t pos;
+ path = find_executable (path, sess.sysroot, sess.sysenv);
+ if (!sess.sysroot.empty()&& ((pos = path.find(sess.sysroot)) != string::npos))
+ path.replace(pos, sess.sysroot.length(), "/");
+ }
if (has_library)
- library = find_executable (library, "LD_LIBRARY_PATH");
+ {
+ size_t pos;
+ library = find_executable (library, sess.sysroot, sess.sysenv,
+ "LD_LIBRARY_PATH");
+ if (!sess.sysroot.empty()&& ((pos = library.find(sess.sysroot)) != string::npos))
+ library.replace(pos, sess.sysroot.length(), "/");
+ }
if (has_function_str)
{
diff --git a/translate.cxx b/translate.cxx
index 97847a8..70c4751 100644
--- a/translate.cxx
+++ b/translate.cxx
@@ -6242,10 +6242,10 @@ add_unwindsym_vdso (systemtap_session&s)
// having the BUILDDIR we need to do a deep search (the specific
// arch name dir in the kernel build tree is unknown).
string vdso_dir;
- if (s.kernel_build_tree == string("/lib/modules/"
+ if (s.kernel_build_tree == string(s.sysroot + "/lib/modules/"
+ s.kernel_release
+ "/build"))
- vdso_dir = "/lib/modules/" + s.kernel_release + "/vdso";
+ vdso_dir = s.sysroot + "/lib/modules/" + s.kernel_release + "/vdso";
else
vdso_dir = s.kernel_build_tree + "/arch/";
@@ -6353,7 +6353,7 @@ emit_symbol_data (systemtap_session& s)
string modname = *it;
assert (modname.length() != 0);
if (! is_user_module (modname)) continue;
- DwflPtr dwfl_ptr = setup_dwfl_user (modname);
+ DwflPtr dwfl_ptr = setup_dwfl_user (modname, s);
Dwfl *dwfl = dwfl_ptr.get()->dwfl;
if (dwfl != NULL) // tolerate missing data; will warn below
{
diff --git a/util.cxx b/util.cxx
index 93cf12a..4158f0d 100644
--- a/util.cxx
+++ b/util.cxx
@@ -345,7 +345,8 @@ tokenize_cxx(const string& str, vector<string>& tokens)
// same policy as execvp(). A program name not containing a slash
// will be searched along the $PATH.
-string find_executable(const string& name, const string& env_path)
+string find_executable(const string& name, const string& sysroot,
+ map<string, char*>& sysenv, const string& env_path)
{
string retpath;
@@ -356,11 +357,15 @@ string find_executable(const string& name, const string& env_path)
if (name.find('/') != string::npos) // slash in the path already?
{
- retpath = name;
+ retpath = sysroot + name;
}
else // Nope, search $PATH.
{
- char *path = getenv(env_path.c_str());
+ char *path;
+ if (sysenv.count(env_path) != 0)
+ path = sysenv[env_path];
+ else
+ path = getenv(env_path.c_str());
if (path)
{
// Split PATH up.
@@ -370,7 +375,7 @@ string find_executable(const string& name, const string& env_path)
// Search the path looking for the first executable of the right name.
for (vector<string>::iterator i = dirs.begin(); i != dirs.end(); i++)
{
- string fname = *i + "/" + name;
+ string fname = sysroot + *i + "/" + name;
const char *f = fname.c_str();
// Look for a normal executable file.
@@ -389,13 +394,24 @@ string find_executable(const string& name, const string& env_path)
// Could not find the program on the $PATH. We'll just fall back to
// the unqualified name, which our caller will probably fail with.
if (retpath == "")
- retpath = name;
+ retpath = sysroot + name;
// Canonicalize the path name.
char *cf = canonicalize_file_name (retpath.c_str());
if (cf)
{
- retpath = string(cf);
+ string scf = string(cf);
+ if (sysroot.empty())
+ retpath = scf;
+ else {
+ int pos = scf.find(sysroot);
+ if (pos == 0)
+ retpath = scf;
+ else {
+ cerr<< _F("ERROR: file %s not in sysroot %s", cf, sysroot.c_str())<< endl;
+ exit(1);
+ }
+ }
free (cf);
}
diff --git a/util.h b/util.h
index e576036..44e41e4 100644
--- a/util.h
+++ b/util.h
@@ -12,6 +12,7 @@
#include<cctype>
#include<set>
#include<iomanip>
+#include<map>
extern "C" {
#include<libintl.h>
#include<locale.h>
@@ -51,6 +52,8 @@ void tokenize(const std::string& str, std::vector<std::string>& tokens,
const std::string& delimiters);
void tokenize_cxx(const std::string& str, std::vector<std::string>& tokens);
std::string find_executable(const std::string& name,
+ const std::string& sysroot,
+ std::map<std::string,char *>& sysenv,
const std::string& env_path = "PATH");
const std::string cmdstr_quoted(const std::string& cmd);
const std::string cmdstr_join(const std::vector<std::string>& cmds);