[BUG] bash script in config now returns "read(childpipefd, str, ff_pipe_bufsiz) failed"

[mhjessen]

Read the FAQ first

• I have checked the FAQ but the issue is not covered

Description

I have a fastfetch custom module in my config which has been using a bash script to show the date/time of the latest Timeshift since Thursday, June 19, 2025 without issues.

After upgrading to fastfetch 2.55.0~noble amd64 the script is failing with no fastfetch output where the custom module output should be. The rest of the fastfetch output is OK.

I added fastfetch command line option ' --show-errors true' and it shows the custom module bash script output: read(childpipefd, str, ff_pipe_bufsiz) failed

The expected output result should be: "Latest Timeshift: ✔ Friday, November 14, 2025 - 10:00 AM PST" OR "Latest Timeshift: ✘ /media/user/external_drive is NOT mounted!"

I have rolled back to fastfetch 2.54.0 and the bash script is working as expected without issues. No changes to the fastfetch config were necessary.

NOTE: I tried fastfetch 2.55.0 installed from both 'GitHub Releases' and 'apt' with the same resulting output error.

Version used

2.55.0~noble amd64

Bug prevalence

Always

Regression

Yes

Installation

Package manager

Package manager

apt

Screenshots

Without the fastfetch command line option ' --show-errors true' there is no output for the custom module.

Using the fastfetch command line option ' --show-errors true' the output in red text is: "Latest Timeshift: read(childpipefd, str, ff_pipe_bufsiz) failed"

Configuration

The custom module in my config:

    {
        "type": "command",
        "text": "sudo bash /usr/local/bin/ts-snapshot ; echo",
        "key": "Latest Timeshift",
    },

This module has been working without issue since Thursday, June 19, 2025 on fastfetch version prior to 2.55.0~noble amd64.

System information

Personally identifiable information redacted using 'MMMM' and '##'

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      "conformanceVersion": "1.4",
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        "name": "MMMM",
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    "type": "TPM",
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  {
    "type": "Version",
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      "compileTime": "Oct 18 2025, 02:17:52",
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  {
    "type": "Break",
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    "type": "Colors",
    "error": "Unsupported for JSON format",
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]

Features built-in

threads
vulkan
wayland
xcb-randr
xrandr
drm
drm_amdgpu
gio
dconf
dbus
imagemagick7
imagemagick6
zlib
sqlite3
rpm
egl
glx
opencl
libpulse
libddcutil
libelf
libzfs
Directx Headers
linux/videodev2
linux/wireless
Embedded pciids

[CarterLi]

Please try

{
        "type": "command",
        "text": "sudo bash /usr/local/bin/ts-snapshot ; echo",
        "key": "Latest Timeshift",
        "parallel": false
}

[CarterLi]

Please also upload your script so I can reproduce the issue

[Honkadaloonga]

I was able to repro with

{
    "$schema": "https://github.com/fastfetch-cli/fastfetch/raw/dev/doc/json_schema.json",
    "logo": null,
    "modules": [
        {
            "type": "command",
            "key": "1",
            "text": "echo 1"
        },
        {
            "type": "command",
            "key": "2",
            "text": "echo 2"
        },
        {
            "type": "command",
            "key": "3",
            "text": "echo 3"
        },
        {
            "type": "command",
            "key": "4",
            "text": "echo 4"
        },
        {
            "type": "command",
            "key": "5",
            "text": "echo 5"
        },
        {
            "type": "command",
            "key": "6",
            "text": "echo 6"
        },
        {
            "type": "command",
            "key": "7",
            "text": "echo 7"
        },
        {
            "type": "command",
            "key": "8",
            "text": "echo 8"
        }
    ]
}

The bug is inconsistent with the percentage of error-ed runs dependent on the amount of command modules starting/running in parallel. The highest I got on my machine was ~22% failure rate with 8 modules.

Adding "parallel": false fixes it.

fastfetch 2.55.0 (x86_64) on Arch 6.17.7-arch1-1

[mhjessen]

After upgrading to Fastfetch v2.55.1~noble I was able to successfully remove the "parallel": false entries from ALL of my custom command modules. Testing shows the fix is no longer needed.

Confirming the issue has been fixed for me with v2.55.1~noble.

Thank you!