mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-01 10:00:56 +00:00
48 lines
1.6 KiB
Diff
48 lines
1.6 KiB
Diff
This patch makes stap(1) know about the kernel store path on NixOS.
|
|
|
|
--- systemtap-1.2/main.cxx 2010-03-22 22:51:49.000000000 +0100
|
|
+++ systemtap-1.2/main.cxx 2010-05-04 14:56:19.000000000 +0200
|
|
@@ -528,6 +528,32 @@ getmemusage ()
|
|
return oss.str();
|
|
}
|
|
|
|
+/* Read `/proc/cmdline' and extract the store path. The assumption is that
|
|
+ `/proc/cmdline' looks like this:
|
|
+
|
|
+ BOOT_IMAGE=/nix/store/sxjd69wfcr6w8jlbcc5bc20nwjliq872-linux-2.6.32.8/bzImage systemConfig=/nix/store/kiicqkjwgfvkwrg4fp3dnhwldh7dq7is-system init=/nix/store/czgncihjwx3n58xij6i1rlnz8wv6ym4j-stage-2-init.sh splash=verbose vga=0x317
|
|
+
|
|
+ This is the case on NixOS GNU/Linux. */
|
|
+static string
|
|
+kernel_store_path (void)
|
|
+{
|
|
+ ifstream proc_cmdline ("/proc/cmdline");
|
|
+ string variable_name, store_path;
|
|
+
|
|
+ getline (proc_cmdline, variable_name, '=');
|
|
+ if (variable_name == "BOOT_IMAGE")
|
|
+ {
|
|
+ string boot_image_path;
|
|
+ size_t slash_pos;
|
|
+
|
|
+ getline (proc_cmdline, boot_image_path, ' ');
|
|
+ slash_pos = boot_image_path.find_last_of ('/');
|
|
+ store_path = boot_image_path.substr (0, slash_pos);
|
|
+ }
|
|
+
|
|
+ return store_path;
|
|
+}
|
|
+
|
|
int
|
|
main (int argc, char * const argv [])
|
|
{
|
|
@@ -541,7 +567,8 @@ main (int argc, char * const argv [])
|
|
struct utsname buf;
|
|
(void) uname (& buf);
|
|
s.kernel_release = string (buf.release);
|
|
- s.kernel_build_tree = "/lib/modules/" + s.kernel_release + "/build";
|
|
+ s.kernel_build_tree =
|
|
+ kernel_store_path () + "/lib/modules/" + s.kernel_release + "/build";
|
|
|
|
// PR4186: Copy logic from coreutils uname (uname -i) to squash
|
|
// i?86->i386. Actually, copy logic from linux top-level Makefile
|