In a previous post, I discussed how to
set up a custom channel. I currently have one hosted
here. I’m using that in
this post where I use guix on a foreign distribution. I have
customized my ~/.config/guix/channels.scm to include my channel with
custom packages:
(cons (channel
(name 'timmy-packages)
(url "https://github.com/timmydo/guix-channel.git")
(branch "main")
(introduction
(make-channel-introduction
"4cec36d449afcf0a6c70e1b63b12bd73372cd122"
(openpgp-fingerprint "4334F13EFD13BC4D7F5E69B61CA27EA507096538"))))
%default-channels)
Then I created a modified package:
(define-module (timmy my)
#:use-module ((guix licenses) #:prefix license:)
#:use-module (guix packages)
#:use-module (guix utils)
#:use-module (gnu packages)
#:use-module (gnu packages base)
#:use-module (ice-9 match))
(define-public my-hello
(package
(inherit hello)
(name "my-hello")
(arguments
`(#:make-flags (list "CFLAGS=-g -fno-omit-frame-pointer -O3 -march=native")
#:strip-binaries? #f))))
After running guix pull, I can find the new package I created.
> guix search my-hello
name: my-hello
version: 2.10
outputs: out
systems: x86_64-linux i686-linux
dependencies:
location: timmy/my.scm:17:2
homepage: https://www.gnu.org/software/hello/
license: GPL 3+
synopsis: Hello, GNU world: An example GNU package
description: GNU Hello prints the message "Hello, world!" and then exits. It serves as an example of standard GNU coding
+ practices. As such, it supports command-line arguments, multiple languages, and so on.
relevance: 20
Compare the old:
$ gdb /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello
Reading symbols from /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello...
(No debugging symbols found in /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello)
(gdb) break main
Breakpoint 1 at 0x4022f0
(gdb) r
Starting program: /gnu/store/a462kby1q51ndvxdv3b6p0rsixxrgx1h-hello-2.10/bin/hello
Breakpoint 1, 0x00000000004022f0 in main ()
(gdb) disassemble
Dump of assembler code for function main:
=> 0x00000000004022f0 <+0>: push %r12
0x00000000004022f2 <+2>: push %rbp
0x00000000004022f3 <+3>: mov %edi,%ebp
0x00000000004022f5 <+5>: push %rbx
0x00000000004022f6 <+6>: mov %rsi,%rbx
0x00000000004022f9 <+9>: xor %r12d,%r12d
0x00000000004022fc <+12>: sub $0x10,%rsp
0x0000000000402300 <+16>: mov (%rsi),%rdi
0x0000000000402303 <+19>: callq 0x4027b0 <set_program_name>
0x0000000000402308 <+24>: mov $0x40501a,%esi
0x000000000040230d <+29>: mov $0x6,%edi
0x0000000000402312 <+34>: callq 0x402260 <setlocale@plt>
0x0000000000402317 <+39>: mov $0x405248,%esi
0x000000000040231c <+44>: mov $0x40505f,%edi
0x0000000000402321 <+49>: callq 0x402100 <bindtextdomain@plt>
0x0000000000402326 <+54>: mov $0x40505f,%edi
0x000000000040232b <+59>: callq 0x4020e0 <textdomain@plt>
0x0000000000402330 <+64>: mov $0x5,%edx
0x0000000000402335 <+69>: mov $0x405065,%esi
0x000000000040233a <+74>: xor %edi,%edi
0x000000000040233c <+76>: callq 0x402110 <dcgettext@plt>
0x0000000000402341 <+81>: mov $0x402710,%edi
0x0000000000402346 <+86>: mov %rax,0x8(%rsp)
0x000000000040234b <+91>: callq 0x4043b0 <atexit>
0x0000000000402350 <+96>: xor %r8d,%r8d
0x0000000000402353 <+99>: mov $0x4053e0,%ecx
0x0000000000402358 <+104>: mov $0x405091,%edx
0x000000000040235d <+109>: mov %rbx,%rsi
0x0000000000402360 <+112>: mov %ebp,%edi
0x0000000000402362 <+114>: callq 0x402140 <getopt_long@plt>
0x0000000000402367 <+119>: cmp $0xffffffff,%eax
0x000000000040236a <+122>: je 0x402420 <main+304>
0x0000000000402370 <+128>: cmp $0x68,%eax
0x0000000000402373 <+131>: je 0x402414 <main+292>
0x0000000000402379 <+137>: jle 0x4023d8 <main+232>
0x000000000040237b <+139>: cmp $0x74,%eax
0x000000000040237e <+142>: je 0x4023f9 <main+265>
0x0000000000402380 <+144>: cmp $0x76,%eax
0x0000000000402383 <+147>: jne 0x4023ee <main+254>
With the new:
$ gdb /gnu/store/2h5cr9f4kxv0sd4jlb0kwgvvl9m91pmm-my-hello-2.10/bin/hello
Reading symbols from /gnu/store/2h5cr9f4kxv0sd4jlb0kwgvvl9m91pmm-my-hello-2.10/bin/hello...
(gdb) b main
Breakpoint 1 at 0x4022f0: file src/hello.c, line 41.
(gdb) r
Starting program: /gnu/store/2h5cr9f4kxv0sd4jlb0kwgvvl9m91pmm-my-hello-2.10/bin/hello
n
Breakpoint 1, main (argc=1, argv=0x7fffffffdd88) at src/hello.c:41
41 src/hello.c: No such file or directory.
(gdb) disassemble
Dump of assembler code for function main:
=> 0x00000000004022f0 <+0>: push %rbp
0x00000000004022f1 <+1>: mov %rsp,%rbp
0x00000000004022f4 <+4>: push %r13
0x00000000004022f6 <+6>: xor %r13d,%r13d
0x00000000004022f9 <+9>: push %r12
0x00000000004022fb <+11>: mov %edi,%r12d
0x00000000004022fe <+14>: push %rbx
0x00000000004022ff <+15>: mov %rsi,%rbx
0x0000000000402302 <+18>: sub $0x18,%rsp
0x0000000000402306 <+22>: mov (%rsi),%rdi
0x0000000000402309 <+25>: callq 0x4027c0 <set_program_name>
0x000000000040230e <+30>: mov $0x40701a,%esi
0x0000000000402313 <+35>: mov $0x6,%edi
0x0000000000402318 <+40>: callq 0x402260 <setlocale@plt>
0x000000000040231d <+45>: mov $0x407248,%esi
0x0000000000402322 <+50>: mov $0x40705f,%edi
0x0000000000402327 <+55>: callq 0x402100 <bindtextdomain@plt>
0x000000000040232c <+60>: mov $0x40705f,%edi
0x0000000000402331 <+65>: callq 0x4020e0 <textdomain@plt>
0x0000000000402336 <+70>: mov $0x5,%edx
0x000000000040233b <+75>: mov $0x407065,%esi
0x0000000000402340 <+80>: xor %edi,%edi
0x0000000000402342 <+82>: callq 0x402110 <dcgettext@plt>
0x0000000000402347 <+87>: mov $0x402720,%edi
0x000000000040234c <+92>: mov %rax,-0x28(%rbp)
0x0000000000402350 <+96>: callq 0x4065b0 <atexit>
0x0000000000402355 <+101>: xor %r8d,%r8d
0x0000000000402358 <+104>: mov $0x4073e0,%ecx
0x000000000040235d <+109>: mov $0x407091,%edx
0x0000000000402362 <+114>: mov %rbx,%rsi
0x0000000000402365 <+117>: mov %r12d,%edi
0x0000000000402368 <+120>: callq 0x402140 <getopt_long@plt>
0x000000000040236d <+125>: cmp $0xffffffff,%eax
0x0000000000402370 <+128>: je 0x402426 <main+310>
0x0000000000402376 <+134>: cmp $0x68,%eax
0x0000000000402379 <+137>: je 0x40241a <main+298>
0x000000000040237f <+143>: jle 0x4023e0 <main+240>
0x0000000000402381 <+145>: cmp $0x74,%eax
0x0000000000402384 <+148>: je 0x402400 <main+272>
0x0000000000402386 <+150>: cmp $0x76,%eax
0x0000000000402389 <+153>: jne 0x4023f5 <main+261>