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