Packaging/Binaries: Difference between revisions

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== Wrong file paths ==

Some programs will try to access hard-coded FHS file paths like <code>/usr/lib</code> or <code>/opt</code>~~, but mostly~~, this will produce silent <code>No such file</code> errors, which can break the program

Some programs will try to access hard-coded FHS file paths like <code>/usr/lib</code> or <code>/opt</code>. Mostly though, this will produce silent <code>No such file</code> errors, which can break the program.

To make these errors visible, we can use <code>strace</code>

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</pre>

~~example:~~

=== Example ===

<pre>

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</pre>

~~this~~ means: process 357679 is trying to open file <code>0600-k_cache17.bin</code> either from the hard-coded path in <code>/opt/brother/Printers/hll3210cw/inf/lut</code> or from the current workdir. so, as a quick fix, we could change the working directory of the wrapped binary with [https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/setup-hooks/make-wrapper.sh makeWrapper]

This means: process <code>357679</code> is trying to open file <code>0600-k_cache17.bin</code> either from the hard-coded path in <code>/opt/brother/Printers/hll3210cw/inf/lut</code> or from the current workdir.

So, as a quick fix, we could change the working directory of the wrapped binary with [https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/setup-hooks/make-wrapper.sh makeWrapper]:

<pre>

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</pre>

~~what~~ process is throwing the <code>No such file</code> error? ~~lets~~ search for the process ID and the <code>exec</code> syscall

=== Finding the failing process ===

How can we find which process is throwing the <code>No such file</code> error? Let's search for the process ID and the <code>exec</code> syscall:

<pre>

@@ Line 287: / Line 287: @@
 == Wrong file paths ==
-Some programs will try to access hard-coded FHS file paths like <code>/usr/lib</code> or <code>/opt</code>, but mostly, this will produce silent <code>No such file</code> errors, which can break the program
+Some programs will try to access hard-coded FHS file paths like <code>/usr/lib</code> or <code>/opt</code>. Mostly though, this will produce silent <code>No such file</code> errors, which can break the program.
 To make these errors visible, we can use <code>strace</code>
@@ Line 300: / Line 300: @@
 </pre>
-example:
+=== Example ===
 <pre>
@@ Line 307: / Line 307: @@
 </pre>
-this means: process 357679 is trying to open file <code>0600-k_cache17.bin</code> either from the hard-coded path in <code>/opt/brother/Printers/hll3210cw/inf/lut</code> or from the current workdir. so, as a quick fix, we could change the working directory of the wrapped binary with [https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/setup-hooks/make-wrapper.sh makeWrapper]
+This means: process <code>357679</code> is trying to open file <code>0600-k_cache17.bin</code> either from the hard-coded path in <code>/opt/brother/Printers/hll3210cw/inf/lut</code> or from the current workdir.
+So, as a quick fix, we could change the working directory of the wrapped binary with [https://github.com/NixOS/nixpkgs/blob/master/pkgs/build-support/setup-hooks/make-wrapper.sh makeWrapper]:
 <pre>
@@ Line 313: / Line 314: @@
 </pre>
-what process is throwing the <code>No such file</code> error? lets search for the process ID and the <code>exec</code> syscall
+=== Finding the failing process ===
+How can we find which process is throwing the <code>No such file</code> error? Let's search for the process ID and the <code>exec</code> syscall:
 <pre>