GNU bug report logs - #78961
30.1; package-vc tries to install package itself again from repo

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Allen Li <darkfeline <at> felesatra.moe>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.1; package-vc tries to install package itself again from repo
Date: Sat, 5 Jul 2025 03:51:34 -0700

When using package-vc to install a package from a checkout, if that
package contains a library that Package-Requires itself, it will try to
install the package again from a repository, leading to weird behavior.

For example, go-mode contains a library go-guru.el, which contains:

;; Package-Requires: ((go-mode "1.3.1") (cl-lib "0.5"))

package-vc will try to install go-mode again based on that line, from
ELPA, leading to having both the go-mode from ELPA and the go-mode from
the checkout installed and conflicting.

Magit [2] also suffers from a variant of this issue.  It has:

;; Package-Requires: (
;;     ...snip...
;;     (magit-section "4.3.8")

which causes package-vc to install magit-section from ELPA, even though
the Magit repo already contains the magit-section library.

I think package-vc should ignore any Package-Requires that are already
satisfied by the local checkout rather than trying to install them.

[1]: https://github.com/dominikh/go-mode.el
[2]: https://github.com/magit/magit

In GNU Emacs 30.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.49,
cairo version 1.18.4)
System Description: Arch Linux

Configured using:
 'configure --with-pgtk --sysconfdir=/etc --prefix=/usr
 --libexecdir=/usr/lib --localstatedir=/var --disable-build-details
 --with-cairo --with-harfbuzz --with-libsystemd --with-modules
 --with-native-compilation=aot --with-tree-sitter 'CFLAGS=-march=x86-64
 -mtune=generic -O2 -pipe -fno-plt -fexceptions -Wp,-D_FORTIFY_SOURCE=3
 -Wformat -Werror=format-security -fstack-clash-protection
 -fcf-protection -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto'
 'LDFLAGS=-Wl,-O1 -Wl,--sort-common -Wl,--as-needed -Wl,-z,relro
 -Wl,-z,now -Wl,-z,pack-relative-relocs -flto=auto'
 'CXXFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=3 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection -fno-omit-frame-pointer
 -mno-omit-leaf-frame-pointer -Wp,-D_GLIBCXX_ASSERTIONS -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug/emacs -flto=auto''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LCMS2 LIBOTF LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

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