Newbie user question: How to delete all files in /gnu/store related to a package definition?

[Rodrigo Morales]

Table of Contents
_________________

1. The context
2. The question


1 The context
=============

  Inexperienced user here. I'm currently learning how to define my own
  packages. I'm using the following package definition to install a
  font.

  ,----
  | (define-module (fonts)
  |   #:use-module (guix packages)
  |   #:use-module (guix git-download)
  |   #:use-module (guix gexp)
  |   #:use-module (guix build-system trivial)
  |   #:use-module ((guix licenses) #:prefix license:))
  |
  | (define-public font-noto-color-emoji
  |   (package
  |     (name "font-noto-color-emoji")
  |     (version "2.034")
  |     (source (origin
  |               (method git-fetch)
  |               (uri (git-reference
  |                     (url "https://github.com/googlefonts/noto-emoji";)
  |                     (commit (string-append "v" version))))
  |               (file-name (git-file-name name version))
  |               (sha256
  |                (base32
  |
"1d6zzk0ii43iqfnjbldwp8sasyx99lbjp1nfgqjla7ixld6yp98l"))))
  |     (build-system trivial-build-system)
  |     (arguments
  |      (list
  |       #:modules `((guix build utils))
  |       #:builder
  |       #~(begin
  |           (use-modules (guix build utils))
  |           (let* ((out #$output)
  |                  (font-dir (string-append out "/share/fonts"))
  |                  (truetype-dir (string-append font-dir "/truetype")))
  |             (chdir (assoc-ref %build-inputs "source"))
  |             (install-file "fonts/NotoColorEmoji.ttf" truetype-dir)))))
  |     (home-page "https://github.com/googlefonts/noto-emoji";)
  |     (synopsis "Noto Color Emoji fonts")
  |     (description "Noto Color Emoji fonts.")
  |     (license license:silofl1.1)))
  `----

  I installed that package without no problems.

  ,----
  | guix package -i font-noto-color-emoji
  | echo Exit code: $?
  `----

  ,----
  | The following package will be installed:
  |    font-noto-color-emoji 2.034
  |
  | The following derivation will be built:
  |   /gnu/store/63y5vvvkmr48cmc17kv6d14miia22z9z-profile.drv
  |
  | building CA certificate bundle...
  | listing Emacs sub-directories...
  | building fonts directory...
  | generating GdkPixbuf loaders cache...
  | generating GLib schema cache...
  | creating GTK+ icon theme cache...
  | building cache files for GTK+ input methods...
  | building directory of Info manuals...
  | building XDG desktop file cache...
  | building XDG MIME database...
  | building profile with 24 packages...
  | hint: Consider setting the necessary environment variables by running:
  |
  |      GUIX_PROFILE="/home/rdrg/.guix-profile"
  |      . "$GUIX_PROFILE/etc/profile"
  |
  | Alternately, see `guix package --search-paths -p
"/home/rdrg/.guix-profile"'.
  | Exit code: 0
  `----

  I could check that the package was installed by executing the
  following command.

  ,----
  | guix package -I font-noto-color-emoji
  `----

  ,----
  | font-noto-color-emoji 2.034 out
/gnu/store/b1myag5hg13qs0n3p3l0av2b2v96czi6-font-noto-color-emoji-2.034
  `----

  I deleted the package.

  ,----
  | guix package -r font-noto-color-emoji
  | echo Exit code: $?
  `----

  ,----
  |
  | The following package will be removed:
  |    font-noto-color-emoji 2.034
  |
  | hint: Consider setting the necessary environment variables by running:
  |
  |      GUIX_PROFILE="/home/rdrg/.guix-profile"
  |      . "$GUIX_PROFILE/etc/profile"
  |
  | Alternately, see `guix package --search-paths -p
"/home/rdrg/.guix-profile"'.
  |
  | Exit code: 0
  `----

  Now, because I've been experimenting with the definition of that
  package, there are multiple files that have been created in
  `/gnu/store'. See output of the command below.

  ,----
  | find /gnu/store -mindepth 1 -maxdepth 1 -name '*font-noto-color-emoji*'
  `----

  ,----
  |
/gnu/store/3m3ifwx0klp2kphx1rmc5qq3z940xbkn-font-noto-color-emoji-2.034.lock
  |
/gnu/store/z085zkl49g4pxmd0f7m5izlmlf7429ac-font-noto-color-emoji-2.034-checkout.drv
  |
/gnu/store/bvc3bfvdblsz6k28m3d1h16ccgv31r3k-font-noto-color-emoji-2.034-builder
  |
/gnu/store/xjrsfz1ca4zphxivmsmz7z7j2xswrrgs-font-noto-color-emoji-2.034.drv
  |
/gnu/store/nbp1bp6pabdl0lqd20bxpwalgcpn4dyn-font-noto-color-emoji-2.034-builder
  |
/gnu/store/rram8vs20f0g6zmvli19lrrkh0wrrz5z-font-noto-color-emoji-2.034.drv
  |
/gnu/store/zka3h8gmvqi9rs16av5xq5b5128kr2v9-font-noto-color-emoji-2.034-builder
  |
/gnu/store/7wgb6vhhwdlx3pwaqvvmvha3vkxsj5kl-font-noto-color-emoji-2.034.drv
  |
/gnu/store/qxjr48bb5qzh8v16xk94yphyb0ppmxlg-font-noto-color-emoji-2.034-builder
  |
/gnu/store/pks5k3gnacyqikb1828qmjks8pb6yvql-font-noto-color-emoji-2.034.drv
  |
/gnu/store/zi928lwkgijciyxd9l68k215hd1z5j7p-font-noto-color-emoji-2.034-builder
  |
/gnu/store/7wk18cpyy7bpi7v04xi2ygavdlf6rg24-font-noto-color-emoji-2.034.drv
  |
/gnu/store/4pjz6gl2aj1sl6zyq8pgxyk9fwf8j9h2-font-noto-color-emoji-2.034-builder
  |
/gnu/store/2j9gykgj0axgg193pd6hvrmnzqbz88nm-font-noto-color-emoji-2.034.drv
  |
/gnu/store/plarjz5jbvwd2s3cv5pk237bnzkbl0pw-font-noto-color-emoji-2.034-builder
  |
/gnu/store/b0b2vzpkxi0i45hvy8c0bs09w20316sw-font-noto-color-emoji-2.034.drv
  |
/gnu/store/sjjszsxaklr8wg47r9s76y4ln98h8j97-font-noto-color-emoji-2.034-builder
  |
/gnu/store/bg3lg99617f8clzjba0z9r15q1305wsr-font-noto-color-emoji-2.034.drv
  |
/gnu/store/y2vzwjpyafar83ag15p9g2j121nczlvy-font-noto-color-emoji-2.034-builder
  |
/gnu/store/kv26z95lf2qxn4h6bq5q169fmxadrw8q-font-noto-color-emoji-2.034.drv
  |
/gnu/store/s9slj9j198gfx3kqp1zkcqhfcyg14rap-font-noto-color-emoji-2-2.034-checkout.drv
  |
/gnu/store/8lgzq20azwhfisxv10y3k9ims26hnc3r-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/aipvm0x05a137hard114kx4bsrq87ahq-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/399x8r112szia15ila5ncwgx7my515bj-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/nx1q95fz8b8y20agmr5jjwv6144k3w7x-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/wirjgrz2s8b34gwy0nkq4whlyjwy9zq3-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/yspy26259vk78k3glh3qnl7i99jixnf6-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/7kdwg0dhckbjr9fw80535waa12qyrdzj-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/vafk3k8za8llvr868v98c63kn0m9c4c4-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/jlmah8rvjrwsasnpvbp81g1dhq7sb5ng-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/r5yp65w0456dqcx3qf3ssf2llfrivy1r-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/mwjh47r3c9bl3hjk03k5c6nmj4kqaf3k-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/dmwyzd77yc2gnnisxfkzaknasj3pr0m1-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/j135a8rxcjf9g35kcylxas7ryqw2qlpw-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/av15fkq561hbdb01010cscj21lgyw9vz-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/6pymy4sik5ywmnbfk94hx0hccpm170ql-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/3w6j2vcj5cxzk7fbcp79gspkj32x28g6-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/rm4m88y98abfy5jnm7y4kdyyw42qszxl-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/3ig8j3nrdvyx6insxnjrbdb8r2lx5bg3-font-noto-color-emoji-2-2.034.drv
  |
/gnu/store/laa1q5k6a9kkganmwjpddw9kj6nygd8m-font-noto-color-emoji-2-2.034-builder
  |
/gnu/store/mlgjqk1xk7wmszs3qiak0ry1nzpd9kc9-font-noto-color-emoji-2-2.034.drv
  | /gnu/store/b1myag5hg13qs0n3p3l0av2b2v96czi6-font-noto-color-emoji-2.034
  | /gnu/store/3m3ifwx0klp2kphx1rmc5qq3z940xbkn-font-noto-color-emoji-2.034
  | /gnu/store/r4223f33vb2qw6mhgvlw9g8ghm3w9pq1-font-noto-color-emoji-2.034
  | /gnu/store/l7sf97435054lp5y8hcg6z8jydkm5x0k-font-noto-color-emoji-2.034
  | /gnu/store/jfjz40xprqh70rvii0mbnyfkxvy4sdq9-font-noto-color-emoji-2.034
  | /gnu/store/z6abnxrz1wj941r80438q8m99jchq2z4-font-noto-color-emoji-2.034
  | /gnu/store/i5iw608yfyk9slf9di1y2c1cwyx61i5b-font-noto-color-emoji-2.034
  | /gnu/store/k6xllqgmb9s6bvi3194rgg7gr5cqlczr-font-noto-color-emoji-2.034
  | /gnu/store/mcm7nz5k8qihcn89c11qc114cvm0v3cy-font-noto-color-emoji-2.034
  |
/gnu/store/c32blyvc9knxmr3fn4wlz26d2sfgs6fh-font-noto-color-emoji-2-2.034-checkout
  |
/gnu/store/kqh995j2wjxh0mmay1np9pvvjfmsa9n2-font-noto-color-emoji-2.034-checkout
  |
/gnu/store/nfw0336absmbrmy33f4mzrx3kbxhmv8v-font-noto-color-emoji-2-2.034
  |
/gnu/store/h2v3ffvjhn5smxir394kjyqg8w5mh4qb-font-noto-color-emoji-2-2.034
  |
/gnu/store/3al3v0ckyn82rz38rs68mqg8z3b963wz-font-noto-color-emoji-2-2.034
  `----


2 The question
==============

  How should I remove all those directories in /gnu/store that are
  related with `font-noto-color-emoji'? I want to delete them because I
  want to continue experimenting and I want to make sure that none of
  those files or directories are interferring with my experimentation in
  any way. I've tried executing the following command, but I get the
  following error.

  ,----
  | find /gnu/store -mindepth 1 -maxdepth 1 -name '*font-noto-color-emoji*'
| xargs guix gc -D
  | echo Exit code: $?
  `----

  ,----
  | finding garbage collector roots...
  | guix gc: error: cannot delete path
`/gnu/store/2j9gykgj0axgg193pd6hvrmnzqbz88nm-font-noto-color-emoji-2.034.drv'
since it is still alive
  | Exit code: 123
  `----

  Again, I need to delete those files, because I want to learn more
  about Guix and continue experimenting, so I want to install the
  package as if it had never been installed in my system. I suppose that
  some files from previous installations are reused, I don't want this
  to occur, that's why I want to delete them.