Getting a "Failed to execute process...Reason: exec: Permission denied" on my fish startup script re: theme

[fulanitodetal]

When I open up Fish using the stock Linux Mint terminal with powerline-shell installed via python, I get the following output:

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Failed to execute process '/home/lloyd/.config/powerline-shell/powerline-shell.py'. Reason: exec: Permission denied

How did I get here/what have I tried?

The aim was to have the flame theme located here: https://github.com/ryanoasis/powerline-extra-symbols


Once I installed Fish and got it working, the next step was to install powerline-shell following the instructions provided here: https://github.com/b-ryan/powerline-shell

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git clone https://github.com/b-ryan/powerline-shell
cd powerline-shell
python setup.py install

Then created the powerline-shell.py file using instructions further below on the same site.

Powerline-shell is customizable through the use of a config file. This file is expected to be located at

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~/.config/powerline-shell/config.json

. You can generate the default config at this location using:

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mkdir -p ~/.config/powerline-shell && \
powerline-shell --generate-config > ~/.config/powerline-shell/config.json

I then copied the same site's default powerline-shell.py: https://github.com/akdetrick/powerline- ... y.template

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#!/usr/bin/env python
# -*- coding: utf-8 -*-

import argparse
import os
import sys

def warn(msg):
    print '[powerline-bash] ', msg

class Powerline:
    symbols = {
        'compatible': {
            'separator': u'\u25B6',
            'separator_thin': u'\u276F'
        },
        'patched': {
            'separator': u'\u2B80',
            'separator_thin': u'\u2B81'
        },
        'flat': {
            'separator': '',
            'separator_thin': '>'
        },
    }

    color_templates = {
        'bash': '\\[\\e%s\\]',
        'zsh': '%%{%s%%}',
        'bare': '%s',
    }

    def __init__(self, args, cwd):
        self.args = args
        self.cwd = cwd
        mode, shell = 'flat', args.shell
        self.color_template = self.color_templates[shell]
        self.reset = self.color_template % '[0m'
        self.separator = Powerline.symbols[mode]['separator']
        self.separator_thin = Powerline.symbols[mode]['separator_thin']
        self.segments = []

    def color(self, prefix, code):
        return self.color_template % ('[%s;5;%sm' % (prefix, code))

    def fgcolor(self, code):
        return self.color('38', code)

    def bgcolor(self, code):
        return self.color('48', code)

    def append(self, content, fg, bg, separator=None, separator_fg=None):
        self.segments.append((content, fg, bg, separator or self.separator,
            separator_fg or bg))

    def draw(self):
        return (''.join(self.draw_segment(i) for i in range(len(self.segments)))
                + self.reset).encode('utf-8')

    def draw_segment(self, idx):
        segment = self.segments[idx]
        next_segment = self.segments[idx + 1] if idx < len(self.segments)-1 else None

        return ''.join((
            self.fgcolor(segment[1]),
            self.bgcolor(segment[2]),
            segment[0],
            self.bgcolor(next_segment[2]) if next_segment else self.reset,
            self.fgcolor(segment[4]),
            segment[3]))

def get_valid_cwd():
    """ We check if the current working directory is valid or not. Typically
        happens when you checkout a different branch on git that doesn't have
        this directory.
        We return the original cwd because the shell still considers that to be
        the working directory, so returning our guess will confuse people
    """
    try:
        cwd = os.getcwd()
    except:
        cwd = os.getenv('PWD')  # This is where the OS thinks we are
        parts = cwd.split(os.sep)
        up = cwd
        while parts and not os.path.exists(up):
            parts.pop()
            up = os.sep.join(parts)
        try:
            os.chdir(up)
        except:
            warn("Your current directory is invalid.")
            sys.exit(1)
        warn("Your current directory is invalid. Lowest valid directory: " + up)
    return cwd


if __name__ == "__main__":
    arg_parser = argparse.ArgumentParser()
    arg_parser.add_argument('--cwd-only', action='store_true',
            help='Only show the current directory')
    arg_parser.add_argument('--cwd-max-depth', action='store', type=int,
            default=4, help='Maximum number of directories to show in path')
    arg_parser.add_argument('--mode', action='store', default='patched',
            help='The characters used to make separators between segments',
            choices=['patched', 'compatible', 'flat'])
    arg_parser.add_argument('--shell', action='store', default='bash',
            help='Set this to your shell type', choices=['bash', 'zsh', 'bare'])
    arg_parser.add_argument('prev_error', nargs='?', type=int, default=0,
            help='Error code returned by the last command')
    args = arg_parser.parse_args()

    powerline = Powerline(args, get_valid_cwd())

Per the instructions on the flame theme site, I added the following to powerline-shell.py: https://github.com/ryanoasis/powerline- ... /flames.py

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class Powerline:
    symbols = {
        # flames (flamey)
        'patched': {
            'lock': u'\uE0A2',
            'network': u'\uE0A2',
            'separator': u'\uE0C0',
            'separator_thin': u'\uE0C1'
        }
    }

My full powerline-shell.py is posted below under the relevant scripts section.

Going back to the original powerline-shell installation instructions, I added the following to config.fish: https://github.com/b-ryan/powerline-shell#fish

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function fish_prompt
    powerline-shell --shell bare $status
end

The full config.fish is below in the relevant scripts section.

Following instructions on the flame theme site, I created the following flames.py theme file: https://github.com/ryanoasis/powerline- ... ames.py#L9

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class Color(DefaultColor):
    USERNAME_FG = 250
    #USERNAME_BG = 240
    USERNAME_BG = 226
    #USERNAME_ROOT_BG = 124
    USERNAME_ROOT_BG = 160

    HOSTNAME_FG = 250
    HOSTNAME_BG = 238

    HOME_SPECIAL_DISPLAY = True
    #HOME_BG = 31  # blueish
    HOME_BG = 208  # blueish
    HOME_FG = 15  # white
    #PATH_BG = 237  # dark grey
    PATH_BG = 166 # dark grey
    #PATH_FG = 250  # light grey
    PATH_FG = 15  # light grey
    #CWD_FG = 254  # nearly-white grey
    CWD_FG = 15 # nearly-white grey
    #SEPARATOR_FG = 244
    SEPARATOR_FG = 15

    #READONLY_BG = 124
    READONLY_BG = 160
    READONLY_FG = 254

    SSH_BG = 166 # medium orange
    SSH_FG = 254

    REPO_CLEAN_BG = 148  # a light green color
    REPO_CLEAN_FG = 0  # black
    REPO_DIRTY_BG = 161  # pink/red
    REPO_DIRTY_FG = 15  # white

    JOBS_FG = 39
    JOBS_BG = 238

    #CMD_PASSED_BG = 236
    CMD_PASSED_BG = 160
    CMD_PASSED_FG = 15
    #CMD_FAILED_BG = 161
    CMD_FAILED_BG = 160
    CMD_FAILED_FG = 15

    SVN_CHANGES_BG = 148
    SVN_CHANGES_FG = 22  # dark green

    VIRTUAL_ENV_BG = 35  # a mid-tone green
    VIRTUAL_ENV_FG = 00

Lastly, I added the theme line to config.json per these instructions on the powerline-shell installation script: https://github.com/b-ryan/powerline-shell#themes

Themes
The powerline_shell/themes directory stores themes for your prompt, which are basically color values used by segments. The

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default.py

defines a default theme which can be used standalone, and every other theme falls back to it if they miss colors for any segments.

If you want to create a custom theme, start by copying one of the existing themes, like the basic. and update your

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~/.config/powerline-shell/config.json

, setting the "theme" to the path of the file. For example your configuration might have:

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  "theme": "~/mythemes/my-great-theme.py"

But for my specific machine, I added:

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,"theme": "~/.config/powerline-shell/themes/flames.py"

I then opened the terminal, and received the error:

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Failed to execute process '/home/lloyd/.config/powerline-shell/powerline-shell.py'. Reason: exec: Permission denied

Thinking this might be a permissions issue with powerline-shell.py or python, I ran the following commands that did not change the error output:

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sudo chmod +x ~/.config/powerline-shell/powerline-shell.py

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sudo chmod +x /bin/python3.8

Any ideas on what's going on or how I can get the theme working? As you can probably tell from my post, I know next to nothing about writing scripts, so pointing me to a helpful and relevant tutorial would be appreciated!

Relevant scripts

config.fish

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if status is-interactive
    # Commands to run in interactive sessions can go here

end

#mutes default fish greeting
set fish_greeting

function fish_prompt
    ~/.config/powerline-shell/powerline-shell.py --shell bare $status
end

#alias for colorls
alias lc='colorls'

#shows system info on terminal startup
screenfetch | lolcat

powerline-shell.py

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#!/usr/bin python3.8
# -*- coding: utf-8 -*-

import argparse
import os
import sys

def warn(msg):
    print '[powerline-bash] ', msg

# these symbols for now have to be set directly in powerline-shell.py:
class Powerline:
    symbols = {
        # flames (flamey)
        'patched': {
            'lock': u'\uE0A2',
            'network': u'\uE0A2',
            'separator': u'\uE0C0',
            'separator_thin': u'\uE0C1'
        }
    }


    color_templates = {
        'bash': '\\[\\e%s\\]',
        'zsh': '%%{%s%%}',
        'bare': '%s',
    }

    def __init__(self, args, cwd):
        self.args = args
        self.cwd = cwd
        mode, shell = 'flat', args.shell
        self.color_template = self.color_templates[shell]
        self.reset = self.color_template % '[0m'
        self.separator = Powerline.symbols[mode]['separator']
        self.separator_thin = Powerline.symbols[mode]['separator_thin']
        self.segments = []

    def color(self, prefix, code):
        return self.color_template % ('[%s;5;%sm' % (prefix, code))

    def fgcolor(self, code):
        return self.color('38', code)

    def bgcolor(self, code):
        return self.color('48', code)

    def append(self, content, fg, bg, separator=None, separator_fg=None):
        self.segments.append((content, fg, bg, separator or self.separator,
            separator_fg or bg))

    def draw(self):
        return (''.join(self.draw_segment(i) for i in range(len(self.segments)))
                + self.reset).encode('utf-8')

    def draw_segment(self, idx):
        segment = self.segments[idx]
        next_segment = self.segments[idx + 1] if idx < len(self.segments)-1 else None

        return ''.join((
            self.fgcolor(segment[1]),
            self.bgcolor(segment[2]),
            segment[0],
            self.bgcolor(next_segment[2]) if next_segment else self.reset,
            self.fgcolor(segment[4]),
            segment[3]))

def get_valid_cwd():
    """ We check if the current working directory is valid or not. Typically
        happens when you checkout a different branch on git that doesn't have
        this directory.
        We return the original cwd because the shell still considers that to be
        the working directory, so returning our guess will confuse people
    """
    try:
        cwd = os.getcwd()
    except:
        cwd = os.getenv('PWD')  # This is where the OS thinks we are
        parts = cwd.split(os.sep)
        up = cwd
        while parts and not os.path.exists(up):
            parts.pop()
            up = os.sep.join(parts)
        try:
            os.chdir(up)
        except:
            warn("Your current directory is invalid.")
            sys.exit(1)
        warn("Your current directory is invalid. Lowest valid directory: " + up)
    return cwd


if __name__ == "__main__":
    arg_parser = argparse.ArgumentParser()
    arg_parser.add_argument('--cwd-only', action='store_true',
            help='Only show the current directory')
    arg_parser.add_argument('--cwd-max-depth', action='store', type=int,
            default=4, help='Maximum number of directories to show in path')
    arg_parser.add_argument('--mode', action='store', default='patched',
            help='The characters used to make separators between segments',
            choices=['patched', 'compatible', 'flat'])
    arg_parser.add_argument('--shell', action='store', default='bash',
            help='Set this to your shell type', choices=['bash', 'zsh', 'bare'])
    arg_parser.add_argument('prev_error', nargs='?', type=int, default=0,
            help='Error code returned by the last command')
    args = arg_parser.parse_args()

    powerline = Powerline(args, get_valid_cwd())

config.json

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{
  "segments": [
    "virtual_env",
    "username",
    "hostname",
    "ssh",
    "cwd",
    "git",
    "hg",
    "jobs",
    "root"

  ]
,"theme": "~/.config/powerline-shell/themes/flames.py""
}

flames.py

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class Color(DefaultColor):
    USERNAME_FG = 250
    #USERNAME_BG = 240
    USERNAME_BG = 226
    #USERNAME_ROOT_BG = 124
    USERNAME_ROOT_BG = 160

    HOSTNAME_FG = 250
    HOSTNAME_BG = 238

    HOME_SPECIAL_DISPLAY = True
    #HOME_BG = 31  # blueish
    HOME_BG = 208  # blueish
    HOME_FG = 15  # white
    #PATH_BG = 237  # dark grey
    PATH_BG = 166 # dark grey
    #PATH_FG = 250  # light grey
    PATH_FG = 15  # light grey
    #CWD_FG = 254  # nearly-white grey
    CWD_FG = 15 # nearly-white grey
    #SEPARATOR_FG = 244
    SEPARATOR_FG = 15

    #READONLY_BG = 124
    READONLY_BG = 160
    READONLY_FG = 254

    SSH_BG = 166 # medium orange
    SSH_FG = 254

    REPO_CLEAN_BG = 148  # a light green color
    REPO_CLEAN_FG = 0  # black
    REPO_DIRTY_BG = 161  # pink/red
    REPO_DIRTY_FG = 15  # white

    JOBS_FG = 39
    JOBS_BG = 238

    #CMD_PASSED_BG = 236
    CMD_PASSED_BG = 160
    CMD_PASSED_FG = 15
    #CMD_FAILED_BG = 161
    CMD_FAILED_BG = 160
    CMD_FAILED_FG = 15

    SVN_CHANGES_BG = 148
    SVN_CHANGES_FG = 22  # dark green

    VIRTUAL_ENV_BG = 35  # a mid-tone green
    VIRTUAL_ENV_FG = 00

inxi -Fxxxrz

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System:    Kernel: 5.4.0-86-generic x86_64 bits: 64 compiler: gcc v: 9.3.0 
           Desktop: Cinnamon 5.0.5 wm: muffin 5.0.1 dm: LightDM 1.30.0 
           Distro: Linux Mint 20.2 Uma base: Ubuntu 20.04 focal 
Machine:   Type: Desktop Mobo: ASRock model: Z97 Killer serial: <filter> 
           UEFI [Legacy]: American Megatrends v: P2.60 date: 03/06/2018 
CPU:       Topology: Quad Core model: Intel Core i7-4790K bits: 64 type: MT MCP 
           arch: Haswell rev: 3 L2 cache: 8192 KiB 
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 63986 
           Speed: 800 MHz min/max: 800/4400 MHz Core speeds (MHz): 1: 800 2: 800 3: 801 
           4: 799 5: 800 6: 801 7: 800 8: 800 
Graphics:  Device-1: NVIDIA GP106 [GeForce GTX 1060 6GB] vendor: eVga.com. driver: nvidia 
           v: 470.74 bus ID: 01:00.0 chip ID: 10de:1c03 
           Display: x11 server: X.Org 1.20.11 driver: modesetting,nvidia 
           resolution: 1920x1080~60Hz, 1920x1080~60Hz 
           OpenGL: renderer: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2 v: 4.6.0 NVIDIA 470.74 
           direct render: Yes 
Audio:     Device-1: Intel 9 Series Family HD Audio vendor: ASRock driver: snd_hda_intel 
           v: kernel bus ID: 00:1b.0 chip ID: 8086:8ca0 
           Device-2: NVIDIA GP106 High Definition Audio vendor: eVga.com. 
           driver: snd_hda_intel v: kernel bus ID: 01:00.1 chip ID: 10de:10f1 
           Device-3: Microdia USB 2.0 Camera type: USB driver: snd-usb-audio,uvcvideo 
           bus ID: 3-1:2 chip ID: 0c45:6366 serial: <filter> 
           Sound Server: ALSA v: k5.4.0-86-generic 
Network:   Device-1: Qualcomm Atheros Killer E220x Gigabit Ethernet vendor: ASRock 
           driver: alx v: kernel port: d000 bus ID: 05:00.0 chip ID: 1969:e091 
           IF: enp5s0 state: down mac: <filter> 
           Device-2: Broadcom and subsidiaries BCM4360 802.11ac Wireless Network Adapter 
           vendor: ASUSTeK driver: wl v: kernel port: d000 bus ID: 06:00.0 
           chip ID: 14e4:43a0 
           IF: wlp6s0 state: up mac: <filter> 
           IF-ID-1: tun0 state: unknown speed: 10 Mbps duplex: full mac: N/A 
Drives:    Local Storage: total: 3.64 TiB used: 354.03 GiB (9.5%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 870 QVO 1TB size: 931.51 GiB 
           speed: 6.0 Gb/s serial: <filter> rev: 2B6Q scheme: MBR 
           ID-2: /dev/sdb vendor: Western Digital model: WD1002FAEX-00Y9A0 size: 931.51 GiB 
           speed: 6.0 Gb/s serial: <filter> rev: 1V01 
           ID-3: /dev/sdc vendor: Samsung model: SSD 860 EVO 2TB size: 1.82 TiB 
           speed: 6.0 Gb/s serial: <filter> rev: 3B6Q scheme: MBR 
Partition: ID-1: / size: 915.40 GiB used: 354.03 GiB (38.7%) fs: ext4 dev: /dev/sda5 
Sensors:   System Temperatures: cpu: 36.0 C mobo: N/A gpu: nvidia temp: 53 C 
           Fan Speeds (RPM): N/A gpu: nvidia fan: 9% 
Repos:     No active apt repos in: /etc/apt/sources.list 
           Active apt repos in: /etc/apt/sources.list.d/fish-shell-release-3-focal.list 
           1: deb http://ppa.launchpad.net/fish-shell/release-3/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/google-chrome.list 
           1: deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main
           Active apt repos in: /etc/apt/sources.list.d/graphics-drivers-ppa-focal.list 
           1: deb http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/hardware:razer.list 
           1: deb http://download.opensuse.org/repositories/hardware:/razer/xUbuntu_21.04/ /
           Active apt repos in: /etc/apt/sources.list.d/lutris-team-lutris-focal.list 
           1: deb http://ppa.launchpad.net/lutris-team/lutris/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/official-package-repositories.list 
           1: deb http://packages.linuxmint.com uma main upstream import backport
           2: deb http://mirror.nodesdirect.com/ubuntu focal main restricted universe multiverse
           3: deb http://mirror.nodesdirect.com/ubuntu focal-updates main restricted universe multiverse
           4: deb http://mirror.nodesdirect.com/ubuntu focal-backports main restricted universe multiverse
           5: deb http://security.ubuntu.com/ubuntu/ focal-security main restricted universe multiverse
           6: deb http://archive.canonical.com/ubuntu/ focal partner
           Active apt repos in: /etc/apt/sources.list.d/openrazer-daily-focal.list 
           1: deb http://ppa.launchpad.net/openrazer/daily/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/openrazer-stable-focal.list 
           1: deb http://ppa.launchpad.net/openrazer/stable/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/polychromatic-stable-focal.list 
           1: deb http://ppa.launchpad.net/polychromatic/stable/ubuntu focal main
           Active apt repos in: /etc/apt/sources.list.d/slgobinath-gcalendar-focal.list 
           1: deb http://ppa.launchpad.net/slgobinath/gcalendar/ubuntu focal main
Info:      Processes: 333 Uptime: 22h 31m Memory: 15.59 GiB used: 7.29 GiB (46.8%) 
           Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 9 Shell: fish 
           v: 3.3.1 running in: gnome-terminal inxi: 3.0.38 

python version

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Python 3.8.10

[vimes666]

I then copied the same site's default powerline-shell.py

I think you forgot to make the file executable:

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chmod +x /home/lloyd/.config/powerline-shell/powerline-shell.py

[fulanitodetal]

I then copied the same site's default powerline-shell.py

I think you forgot to make the file executable:

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chmod +x /home/lloyd/.config/powerline-shell/powerline-shell.py

I think I already did that unless I'm missing something. See screenshot of the original post below.

[vimes666]

I think I already did that unless I'm missing something. See screenshot of the original post below.

Yes, sorry I missed that one.

[vimes666]

Try this:

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sudo chmod -x ~/.config/powerline-shell/powerline-shell.py

and then

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chmod +x ~/.config/powerline-shell/powerline-shell.py

So the second one without sudo.