bug#37249: console shell upon login is not ~/.guix-profile/bash -- is this always/never ok?

[iyzsong@member.fsf.org (宋文武)]

Bengt Richter <bokr@bokr.com> writes:

> Hello,
>
> In the pursuit of causes for problems as yet not clear enough to
> post as bugs, I am looking for ambivalences in name searches
> in /gnu/... and /(the-rest).

Hello, I think most guix packages (some won't or require manual
configurations) will work on a foreign GNU/Linux distribution, and guix
shouldn't cause problems for the distribution.

>
> The first is immediately bash:
> To duplicate, log into a fresh console and look at what's running
> and invoked. I did an Alt-F4 and logged in fresh, and captured the
> terminal screen seen in the following:
>
> ---------8<---------
>
> [ ... snip some output from .bash_profile ... ]
>
> [13:33 ~/bs]$ ps -o pid,tty,args
>   PID TT       COMMAND
> 25500 tty4     -bash
> 25966 tty4     ps -o pid,tty,args
> [13:35 ~/bs]$ which -a ps
> /usr/bin/ps
> [13:35 ~/bs]$ file /proc/25500/exe
> /proc/25500/exe: symbolic link to /usr/bin/bash
>
> So, the shell I am talking to right after login is /usr/bin/bash,
> but if I type bash, the guix version will be found first:
>
> [13:36 ~/bs]$ which -a bash
> /home/bokr/.guix-profile/bin/bash
> /usr/bin/bash
> [13:38 ~/bs]$ which -a bash|xargs readlink -f
> /gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash
> /usr/bin/bash

After login, user's shell program as specified in /etc/passwd will be
executed.  So you should have '/usr/bin/bash' or '/bin/bash' in
/etc/passwd, and your $PATH have '$HOME/.guix-profile/bin' before
'/usr/bin', so when type 'bash' in a shell, the guix one got executed.

>
> So, nesting into the guix one,
>
> [13:39 ~/bs]$ bash
> [13:39 ~/bs]$ ps -o pid,tty,args
>   PID TT       COMMAND
> 25500 tty4     -bash
> 26226 tty4     bash
> 26253 tty4     ps -o pid,tty,args
> [13:40 ~/bs]$ file /proc/26226/exe
> /proc/26226/exe: symbolic link to /gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash
>
> Indeed our current pid belongs to guix bash.
> What is the difference? They were built differently...
>
> [13:41 ~/bs]$
> [13:42 ~/bs]$ which -a bash
> /home/bokr/.guix-profile/bin/bash
> /usr/bin/bash
> [13:43 ~/bs]$ which -a bash|xargs readlink -f|while read line;do echo -ne "$line:\n    "; file "$line";done
> /gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash:
>     /gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash:
>     ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter
>     /gnu/store/h90vnqw0nwd0hhm1l5dgxsdrigddfmq4-glibc-2.28/lib/ld-linux-x86-64.so.2,
>     for GNU/Linux 2.6.32, not stripped
> /usr/bin/bash:
>     /usr/bin/bash: ELF 64-bit LSB pie executable, x86-64, version 1 (SYSV), dynamically linked,
>     interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=21a51cb5f7d727370e4d8099d283d7cd20222571,
>     for GNU/Linux 3.2.0, stripped
>
> Are the differences possibly dangerous?

It's totally OK, you can use both :-)

>
> The way I got the above, and this tail part itself:
> [13:45 ~/bs]$ tty
> /dev/tty4
> [13:47 ~/bs]$ su -c 'setterm -file login-bashes.txt -dump 4'
> ------------------------------------
>
> Looking for dependencies outside of /gnu from within /gnu, I grepped the whole
> as you see below. I am sure most of this is fine and coming out of documentation
> and stuff meant for other than normally booted runtime. But does it all look ok?
>
> Or is my foreign-host twilight-zone shared ArchLinux/guix namespace really not
> meant to be. I.e., is guix really defined to use /usr/ as a trusted base namespace
> when it is defined by e.g. linux-libre in GuixSD ?
>
> Where would be the best docs to read about the guix name and environment rationales?

There are no 'namespace' involed, guix and your ArchLinux packages share
the same filesystem.  And guix binaries are self-contained, they can
work without any dependenices outsite of /gnu (sometimes they will use
what's available in PATH, etc. which may be provided by your distribution).

>
> Ok, here is the grep:
> (most of the bashes are in the store, as seen at the bottom, but many not)
> -------------------------------
> This was generated by:
>     grep -Ihr '^ *#!' /gnu|sort|uniq -c|sort -h > gnu-bin-hash-bangs.txt
>
>       2       #!/bin/csh
>       2 #!/bin/tcsh
>       2 #!@GAWK@ -f
>       2 #!/gnu/store/03n7p9g78ixkrmra674pkx2c9cx8fwmz-guile-1.8.8/bin/guile \
>       2 #!/gnu/store/0xfmkqpi7xk3ixhrqvjijk4ibsglif62-python-3.7.0/bin/python3.7m
>       2 #!/gnu/store/57daq0hkwvmwx4asiy669cmln868brfm-python2-2.7.15/bin/python2
>       2 #!/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile
>       2 #!/gnu/store/b7fqhszxl02g6pfm3vw6b3cjz472qrly-python-3.7.0/bin/python3.7m
>       2 #!/gnu/store/cl42c73h609bp2gy92qkh8q56spnnl2n-python-3.7.0/bin/python3.7m
>       2 #! /gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl
>       2 #!/gnu/store/h8l1pby3cm6b4fxsfwwr65b4d1hyh6cs-python-3.7.0/bin/python3.7m
>       2 #!/gnu/store/l67sib1ld0fgyf0f4vrzyxnmn4yvimvb-gawk-4.2.1/bin/gawk -f
>       2 #!/gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/sh -
>       2 #!/gnu/store/ybglr7nfs8v9kpnm8vf4drg3gafnvd15-guile-static-stripped-2.2.4/bin/guile --no-auto-compile
>       2 #!/gnu/store/zm3188ipzi262s0m8bxm24br77yh9pd8-python-3.7.0/bin/python3
>       2 #!/gnu/store/zm3188ipzi262s0m8bxm24br77yh9pd8-python-3.7.0/bin/python3.7m
>       2 #!@GUILE@ -s
>       2 #!@PHP@ -q
>       2 #!@TCLSH@
>       2 #! /usr/bin/perl
>       2 #!/usr/bin/perl -- # -*- Perl -*-
>       2  #! /usr/bin/perl -w
>       2 #! /usr/bin/python
>       2 #!/usr/bin/python -u
>       2 #!@WISH@
>       3 #!#{Gem.ruby}
>       3 #!/gnu/store/81y6l9ggc5q6z44hp90ll4dv5jl582mq-texlive-bin-20180414/bin/texlua 
>       3 #!/gnu/store/hw0cz0mis43z19i76pl6ijx5risx4lf0-texlive-bin-20180414/bin/texlua 
>       3 #!/gnu/store/lgbiv7q1b6m141nrkjm92qkl9ih5gamw-python2-2.7.15/bin/python -O
>       3 #!/gnu/store/pyrlmxqx3g1mhzpnfpw4w94rj08wxfhj-texlive-bin-20180414/bin/texlua 
>       3 #!/gnu/store/x9c77i6r5fmarslij6ng81awgrxblplm-texlive-bin-20180414/bin/texlua 
>       3 #!/gnu/store/xwzyy0q261brxmafkvinrrvkq4rgwiq6-texlive-bin-20180414/bin/texlua 
>       3                    #!if(WithStride,".stride","")
>       3                 #!if(WithStride,".stride","")
>       3 #! libapr-1.so
>       3  #!/usr/bin/env ruby
>       4                 #! $key eq '-range'    and  $key .= 's';
>       4             #! $pod_parser->select(@{ $opts{'-ranges'} })
>       4 #!$^X -w
>       4 #! at all.)
>       4 #!/gnu/store/9jjnk994sg3kynx7w2p873x60yr27q1p-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/cwla78yg7vnngk51jp81j4phy2fpgbhm-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/glvv9jyp28f8454laig76agc3jig4f4z-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/gvwf71vddp8c1d7ydqg02p43mgdjrx6s-bash
>       4 #!/gnu/store/qqfrzd5jrpq7i1gn9spv7hzpj4kllvj0-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/qsvja1gy86vrdkcqygkamg5j0sfq6ry4-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/s795jav4270x940spl48a885nhw4axnx-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/wsd8i4dy3vvkpfjlg5m1q5cy0b2ld95q-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/yw409j5hzvhgj54p2xxaqbh3bz9zfhpg-pulseaudio-12.2/bin/pulseaudio -nF
>       4 #!/gnu/store/zvhp49cvslhjdv7n19nssv2kr2jqa87h-pulseaudio-12.2/bin/pulseaudio -nF
>       4             #!     if ( (defined $opts{'-ranges'})
>       4 #!include_default, #!include /Path/to/another/manifest.skip
>       4 #! libaprutil-1.so
>       4     #! /opt/perl5/bin/perl
>       4   #!/path/to/a/custom_perl --some --args
>       4    #!/path/to/jperl
>       4    #!/path/to/perl -Mencoding=euc-jp
>       4 #!/path/to/perl script invocation.  There is a PTF available from
>       4     #! -*-perl-*-
>       4   #!perl
>       4 #! perl
>       4 #!@PERL@
>       4    #!perl -l
>       4     #!perl -T
>       4 #!./perl -w
>       4 #!/pro/bin/perl
>       4 #!/QOpenSys/perl/bin/perl should always work.
>       4             #!          && ((ref $opts{'-ranges'}) eq 'ARRAY') );
>       4             #! ## Select the desired paragraph ranges
>       4   #!/usr/bin/env perl use lib qw( lib );      # Add ./lib to @INC
>       4 #!/usr/bin/perl MakeMaker will change this to the path of the perl
>       4     #!/usr/bin/perl -n
>       4     #!/usr/bin/perl -pi.orig
>       4     #!/usr/bin/perl -s
>       4     #!/usr/bin/perl -spi.orig	# same as -s -p -i.orig
>       4     #!/usr/bin/perl -T -w
>       4     #!/usr/bin/perl  -w
>       4   #!/usr/bin/perl -wl
>       4     #!/usr/bin/perl -w -T
>       4   #!/usr/bin/php 
>       4 #! /usr/bin/sh
>       4     #!/usr/local/bin/perl5.14
>       4     #!/usr/local/bin/perl     # just a comment really
>       4   #!/usr/local/perl-5.6/bin/perl -w
>       4     #!/usr/locl/bin/perl
>       5 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -W
>       5 #!/gnu/store/g87hamjyipk1j6dfq5pjfzfnfb64spbv-python2-2.7.15/bin/python -O
>       5 #!/gnu/store/iqx98v4rnw26n4qn555l4pbj96navxiv-python2-2.7.15/bin/python -O
>       5 #!/usr/bin/env python2
>       6 #!2_]r;QWmr;HTnrVZTls&f@&'E.jlrVud)rr5ao!5AL4r;?NmrVlcos83-$s!e*NeGfI2rVud!
>       6     #![allow(dead_code, unused_imports)]
>       6 #! /bin/bash
>       6   #!/bin/bash^^J%
>       6         #!/bin/sh
>       6 #!bQ7"8Gg6b3eoe>$R71>:0O.S=?1;7XQV?G"!XuWkieE.A([)Gb:<g^IbF&+pDD
>       6 #!cslatex
>       6 #! <fmtname> <enginename> <hyphen> <args>
>       6 #!GaH0,lQdqUHRI!sXe9eQO3Ee^,L\eVF^Wbnu,aSH[**!_"<Pp=0tM"j#6E8hJM_"j#6E?QmeH
>       6 #!/gnu/store/2k67pvrdq9hygg2ysgflk94jhbnc9s9g-tcsh-6.20.00/bin/csh
>       6 #!/gnu/store/2k67pvrdq9hygg2ysgflk94jhbnc9s9g-tcsh-6.20.00/bin/csh -xv
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -n
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -p -i
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -p -i.bak
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -T
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -T -w
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -w
>       6 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -w 
>       6 #!H!IX"''9Wa>D7VYA@E`L5suKOJFl<>^ul(bEXhP*HM"9Cbeu,BGMsN,"AdAt[@0
>       6 #!*k<&fW2FrVus62#[IT!r2g.8PT6c"onDor;HKjrVQBcqo8O6&-;h3!XT9::G`Fa"TSNE1E60,
>       6 #!Kmci!<<*"Z2t"+!g3]e!<<*"\cMj3"Hj)l!<<*"_?'];"d0#h!<<*"aoVPC#Ef
>       6 #!kTb'N:-k+U6(!m^1q$6QNUqf%C$^9!K[Ab31,32$=gB!5?i/?h?%VXZd%RmtRZfZE*me2U0QZ'3/
>       6 #!latex
>       6 #! Map belleek.map
>       6 #! Map mapname.map
>       6 #! MixedMap mapname.map
>       6 #!/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-glibc-2.18/bin/sh
>       6 #!P5"q7-/;:!\TuP1=X[Q1lGL6k.rYpP!p4b6-X*ZAl;G!b8,cGrd14Q5D0jpXMON
>       6 #!pdfcslatex
>       6 #!pdflatex
>       6 #! @PERL@ -w
>       6 #!rF>2s`M\gb\?pQ[)lRMVXD7X%;@d6\M.@oPbQ)'8mjcqSsDGM79n2$XtTN<DZbi
>       6 #!topic/comp.text.tex/o14P2e83o4A}{comp.text.tex} for a macro that will define commands and also save the commands being defined in a file or a container macro, \eg, for spelling exceptions on editors that don't support \tex syntax.
>       6 #!UGlO1/(4)%t4-m<.kt,%uoHGtV4M7IFIlnDr.!2?[>P^t.[[P$W\[/V0J8eAS<P
>       6 #! /usr/bin/env perl
>       6 #!/usr/bin/env pfaedit
>       6 #!/usr/bin/fontforge -lang=ff
>       6 #!/usr/bin/fontforge -script
>       6 #!/usr/bin/fontforge -script 
>       6 #!/usr/local/bin/perl
>       7 #!/gnu/store/lgbiv7q1b6m141nrkjm92qkl9ih5gamw-python2-2.7.15/bin/python2
>       8 #!/gnu/store/81y6l9ggc5q6z44hp90ll4dv5jl582mq-texlive-bin-20180414/bin/texlua  
>       8 #!/gnu/store/8z9avbgm73nzrbkhscps68gcpfipgllc-bootstrap-binaries-0/bin/bash
>       8 #!/gnu/store/hw0cz0mis43z19i76pl6ijx5risx4lf0-texlive-bin-20180414/bin/texlua  
>       8 #!/gnu/store/pyrlmxqx3g1mhzpnfpw4w94rj08wxfhj-texlive-bin-20180414/bin/texlua  
>       8 #!/gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/sh
>       8 #!/gnu/store/x9c77i6r5fmarslij6ng81awgrxblplm-texlive-bin-20180414/bin/texlua  
>       8 #!/gnu/store/xwzyy0q261brxmafkvinrrvkq4rgwiq6-texlive-bin-20180414/bin/texlua  
>       8 #!/gnu/store/zzakf905mzla4csi1dn9qpcwmgbxj29b-bash-static-4.4.23/bin/bash
>       8 #!/gnu/store/zzakf905mzla4csi1dn9qpcwmgbxj29b-bash-static-4.4.23/bin/sh
>       8  #!/usr/bin/perl -n
>       8  #!/usr/bin/perl -Tw
>       8     #!/usr/local/bin/perl
>       8     #!/usr/local/bin/perl5.10.0
>       8     #!/your/path/to/perl
>      10 #!/gnu/store/0xfmkqpi7xk3ixhrqvjijk4ibsglif62-python-3.7.0/bin/python3
>      10 #!/gnu/store/cl42c73h609bp2gy92qkh8q56spnnl2n-python-3.7.0/bin/python3
>      10    #!/usr/bin/emacs --script
>      11 #!/bin/sh -x
>      11 #!!!!!!!!???  Check @pwd_log
>      11 #!/gnu/store/g30znz9vwkvi23k41dgallfg85sj65hp-python-wrapper-3.7.0/bin/python
>      11 #!/gnu/store/iqx98v4rnw26n4qn555l4pbj96navxiv-python2-2.7.15/bin/python2
>      11 #!/usr/bin/emacs -script
>      11 #! /usr/local/bin/python
>      12        #!/bin/sh
>      12   #! /bin/sh
>      12 #! cont-fr pdftex cont-usr.tex -8bit *cont-fr.mkii
>      12 #! cont-it pdftex cont-usr.tex -8bit *cont-it.mkii
>      12 #! cont-nl pdftex cont-usr.tex -8bit *cont-nl.mkii
>      12 #! cont-ro pdftex cont-usr.tex -8bit *cont-ro.mkii
>      12 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -n -s
>      12 #!/gnu/store/l67sib1ld0fgyf0f4vrzyxnmn4yvimvb-gawk-4.2.1/bin/awk -f
>      12 #!/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/sh -vx
>      12     #! Map belleek.map
>      12 #! mflua mflua-nowin - mf.ini
>      12  #!/usr/bin/env perl
>      12 #!/usr/bin/fontforge
>      12     #!/usr/bin/perl -Tw
>      12 #!/usr/bin/python
>      12 #!/usr/local/bin/fontforge
>      12 #! /usr/local/bin/perl
>      12     #!/usr/local/bin/perl -w
>      13 #!/gnu/store/0xfmkqpi7xk3ixhrqvjijk4ibsglif62-python-3.7.0/bin/python3.7
>      13 #!/gnu/store/b7fqhszxl02g6pfm3vw6b3cjz472qrly-python-3.7.0/bin/python3.7
>      13 #!/gnu/store/cl42c73h609bp2gy92qkh8q56spnnl2n-python-3.7.0/bin/python3.7
>      13 #!/gnu/store/g87hamjyipk1j6dfq5pjfzfnfb64spbv-python2-2.7.15/bin/python2
>      13 #!/gnu/store/h8l1pby3cm6b4fxsfwwr65b4d1hyh6cs-python-3.7.0/bin/python3.7
>      13 #!/gnu/store/zm3188ipzi262s0m8bxm24br77yh9pd8-python-3.7.0/bin/python3.7
>      14 #!@EMACS@ --script
>      14 #!/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile -ds
>      14 #!/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/sh -
>      14 #!/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/sh -x
>      14 #!@GUILE@ \
>      14 #!@GUILE@ -ds
>      14     #! luajitlatex luajittex language.dat,language.dat.lua lualatex.ini
>      16 #!$PERL
>      16 #!/usr/local/bin/perl -w
>      17 #!/gnu/store/3w3nz0h93h7jif9d9c3hdfyimgkpx1a4-python-wrapper-3.7.0/bin/python
>      18 #!
>      18 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -s
>      18 #! luajitlatex luajittex language.dat,language.dat.lua lualatex.ini
>      18 #!./perl
>      18           #!perl.exe (versions below 4)
>      18 #!/usr/bin/env perl
>      20 #! /gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash
>      20  #!/usr/bin/perl -w
>      21 #!/gnu/store/b7fqhszxl02g6pfm3vw6b3cjz472qrly-python-3.7.0/bin/python3
>      22 #!/gnu/store/iqx98v4rnw26n4qn555l4pbj96navxiv-python2-2.7.15/bin/python2.7
>      22 #!/usr/bin/env wish
>      23 #!/gnu/store/r68bi4640vm0s7zsgyk7shsag8ibl3nc-python-wrapper-3.7.0/bin/python
>      24 #!/bin/lua
>      24 #!/usr/bin/lua
>      24  #!/usr/bin/perl
>      25 #!/gnu/store/57daq0hkwvmwx4asiy669cmln868brfm-python2-2.7.15/bin/python2.7
>      25 #!perl -w
>      28 #!/gnu/store/lgbiv7q1b6m141nrkjm92qkl9ih5gamw-python2-2.7.15/bin/python2.7
>      28 #!perl
>      29 #!/gnu/store/bs6bwq60sh3zamgiqmkyryf1lxbfjkgd-lua-5.3.5/bin/lua
>      30  #![allow(dead_code, unused_variables)]
>      30 #!/usr/bin/env python
>      32     #!/usr/bin/env perl
>      33 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl 
>      35  #![allow(unused_variables)]
>      35  #! /bin/sh -e
>      35  #![feature(omit_gdb_pretty_printer_section)]
>      36 #! $SHELL
>      38 #!/gnu/store/@dots{}-guile-2.0.11/bin/guile -ds
>      38 #!/gnu/store/g87hamjyipk1j6dfq5pjfzfnfb64spbv-python2-2.7.15/bin/python2.7
>      40     #!/bin/sh
>      40 #!/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile --no-auto-compile
>      42 #!/gnu/store/r658y3cgpnf99nxjxqgjiaizx20ac4k0-guile-2.2.4/bin/guile --no-auto-compile
>      42 #!/usr/bin/env ../utility/fontforge-interp.sh
>      44   #!/usr/bin/perl
>      45 #!/usr/bin/env ruby
>      46   #!location/of/bin/ruby
>      47 #!@BASH@
>      48 #!/usr/bin/env texlua
>      50 #!/gnu/store/9alic3caqhay3h8mx4iihpmyj6ymqpcx-guile-2.2.4/bin/guile \
>      51 #!/usr/bin/perl -w
>      53 #!/usr/bin/env fontforge
>      56 #!@SHELL@
>      56     #!/usr/bin/perl
>      57 #!/gnu/store/5wp8mhmlq2xbd6kg0dq7armjgva7j7cs-perl-5.28.0/bin/perl
>      60 #!/gnu/store/2k67pvrdq9hygg2ysgflk94jhbnc9s9g-tcsh-6.20.00/bin/csh -f
>      61 #!/gnu/store/zvm2hcnbcv9mygzwpbrb6pvj1nc9wbfv-perl-boot0-5.28.0/bin/perl
>      63   #!location/of/bin/bash
>      64 #! /bin/sh
>      66     #!/usr/bin/perl -w
>      80 #! /usr/bin/env python
>      90 #! /usr/bin/env python3
>     108 #!/gnu/store/fndcvkn64ycw720d3ikjvmyvhsqk2v4n-ruby-2.5.3/bin/ruby
>     110 #!~a
>     116 #!/usr/bin/perl
>     137  #!/bin/sh
>     140 #!/gnu/store/61sixy2zjzlrpqwxphzf7v6h0yaysx1s-ruby-2.5.3/bin/ruby
>     140 #!/gnu/store/lgbiv7q1b6m141nrkjm92qkl9ih5gamw-python2-2.7.15/bin/python
>     145 #!/gnu/store/8z9avbgm73nzrbkhscps68gcpfipgllc-bootstrap-binaries-0/bin/sh
>     146 #!/gnu/store/hw0cz0mis43z19i76pl6ijx5risx4lf0-texlive-bin-20180414/bin/texlua
>     146 #!/gnu/store/xwzyy0q261brxmafkvinrrvkq4rgwiq6-texlive-bin-20180414/bin/texlua
>     150 #!/gnu/store/81y6l9ggc5q6z44hp90ll4dv5jl582mq-texlive-bin-20180414/bin/texlua
>     150 #!/gnu/store/pyrlmxqx3g1mhzpnfpw4w94rj08wxfhj-texlive-bin-20180414/bin/texlua
>     150 #!/gnu/store/x9c77i6r5fmarslij6ng81awgrxblplm-texlive-bin-20180414/bin/texlua
>     162 #!/usr/bin/env python3
>     167 #!/bin/bash
>     169 #!/usr/bin/env python
>     207 #!/gnu/store/iqx98v4rnw26n4qn555l4pbj96navxiv-python2-2.7.15/bin/python
>     209 #!/gnu/store/g87hamjyipk1j6dfq5pjfzfnfb64spbv-python2-2.7.15/bin/python
>     228 #!/bin/sh
>     292 #!/gnu/store/5s2nib1lrd2101bbrivcl17kjx1mspw6-coreutils-8.30/bin/false
>     292 #!/gnu/store/8z9avbgm73nzrbkhscps68gcpfipgllc-bootstrap-binaries-0/bin/false
>     319 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl -w
>     362  #!/bin/bash
>    1589 #!/gnu/store/dna8kpb00kq176rz8x69yy4j33my2q55-perl-5.28.0/bin/perl
>    2706 #!/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/bash
>    3294 #!/gnu/store/q19l04vd2za80mk1845pz7r8cz29qk43-bash-minimal-4.4.23/bin/sh
>    3871 #!/gnu/store/qn1ax1fkj16x280m1rv7mcimfmn9l2pf-bash-4.4.23/bin/bash
> -----------------------------------------------------

Yeah, a guix package should patch all those shell interperters from
/bin, /usr/bin, etc to the store path under /gnu/store, but may miss
some cases (which should be fixed).

>
> Some look a bit weird, like
>       6 #!/nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-glibc-2.18/bin/sh
> but I guess it could be a template for some remote context. Idk.
> There is no /nix directory on my disk anyway. Maybe inside a ramdisk image?

I don't know, guess it should be fine...
>
> (There were lots of matches in what appears binary to grep, but they were
> all to inside /gnu/store, so I  eliminated them for here, with -I)
>
> BTW, I haven't yet started shepherd automatically, and it isn't running in the above.
> Just guix-daemon:
> from emacs I'm in now: Esc-1 Esc-! ps -e f |grep -i guix
>   530 ?        Ss     0:00 /var/guix/profiles/per-user/root/current-guix/bin/guix-daemon --build-users-group=guixbuild
> 31185 ?        Ss     0:00              \_ /home/bokr/.guix-profile/bin/bash -c ps -e f |grep -i guix
> 31187 ?        S      0:00                  \_ grep -i guix
>
> I have set SHELL=/home/bokr/.guix-profile/bin/bash in ~/.bash_profile,
> but as seen, that doesn't take effect for the immediate login shell.
>
> I wonder if I could exec it at the end of ~/.bash_profile -- or even as the first and only thing, hm...

Both should work, but you might try the guix system if have so much
choices trouble you :-)
>
> Hope someone can point to to enlightening reading re names in guix and its environments. TIA ;-)
>
> Bengt Richter

I'm not sure what you mean about "names" and "environments", in the
low-level, they are:

filesystem:
  guix use /gnu, /var/guix, /var/log/guix, and $HOME/.guix-profile, your
  distribution doesn't use those, so guix can live within it happily.

environment variables:
  PATH, MANPATH, INFOPATH (and more...), both guix and your distribution
  share the same ones, so there maybe some conflicts.

Hope it helps!