id summary reporter owner description type status priority milestone component version resolution keywords cc blockedby blocking branch_state votes 4253 Interference of injected subshell commands output with e.g. read in .zshrc causing 10s startup delay marlonrichert "== Steps to reproduce == {{{#!sh $ cd $(mktemp -d); exec env -i HOME=$PWD TERM=$TERM zsh -f % print -r ""typeset -F SECONDS print -nr \$'\e[6n' # We query the terminal for info. IFS=\$'\e[;' read -Asd R -- reply # We read the terminal's reply. print \$SECONDS "" > .zshrc % exec zsh # Starting zsh is still instantaneous. 0.0557880000 % SECONDS=0; mc; print $SECONDS # Starting mc is now really slow. 11.5728380000 % }}} The problem is here: https://github.com/MidnightCommander/mc/blob/a88a626e76139259e5b6fc0db39045f051e243dd/src/subshell/common.c#L1378 You print commands to the shell as if it were user input or terminal input. This interferes with the `read` statement in the `.zshrc` file: The terminal's reply is now buried inside the characters you are printing. As a result, the `read` statement hangs until it times out and most of the commands you print don't get executed. == Expected behavior == Don't print to the shell. If you want to execute commands, just pass them straight to Zsh by using the `-c` flag. See https://zsh.sourceforge.io/Doc/Release/Invocation.html#Invocation-2 == `mc` debug info == {{{#!sh % LC_MESSAGES=C mc -F Home directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX Profile root directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX [System data] Config directory: /usr/local/Cellar/midnight-commander/4.8.26/etc/mc/ Data directory: /usr/local/Cellar/midnight-commander/4.8.26/share/mc/ File extension handlers: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/ext.d/ VFS plugins and scripts: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/ extfs.d: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/extfs.d/ fish: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/fish/ [User data] Config directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.config/mc/ Data directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/ skins: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/skins/ extfs.d: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/extfs.d/ fish: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/fish/ mcedit macros: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/mc.macros mcedit external macros: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/mcedit/macros.d/macro.* Cache directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.cache/mc/ % LC_MESSAGES=C mc -F mc --configure-options Home directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX Profile root directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX [System data] Config directory: /usr/local/Cellar/midnight-commander/4.8.26/etc/mc/ Data directory: /usr/local/Cellar/midnight-commander/4.8.26/share/mc/ File extension handlers: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/ext.d/ VFS plugins and scripts: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/ extfs.d: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/extfs.d/ fish: /usr/local/Cellar/midnight-commander/4.8.26/libexec/mc/fish/ [User data] Config directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.config/mc/ Data directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/ skins: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/skins/ extfs.d: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/extfs.d/ fish: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/fish/ mcedit macros: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/mc.macros mcedit external macros: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.local/share/mc/mcedit/macros.d/macro.* Cache directory: /private/var/folders/24/37_vm48s2tz9bhmj1rzffvl40000gn/T/tmp.J1v4nVJX/.cache/mc/ '--disable-debug' '--disable-dependency-tracking' '--disable-silent-rules' '--prefix=/usr/local/Cellar/midnight-commander/4.8.26' '--without-x' '--with-screen=slang' '--enable-vfs-sftp' 'CC=clang' 'PKG_CONFIG_PATH=/usr/local/opt/libffi/lib/pkgconfig:/usr/local/opt/pcre/lib/pkgconfig:/usr/local/opt/openssl@1.1/lib/pkgconfig:/usr/local/opt/readline/lib/pkgconfig:/usr/local/opt/sqlite/lib/pkgconfig:/usr/local/opt/tcl-tk/lib/pkgconfig:/usr/local/opt/xz/lib/pkgconfig:/usr/local/opt/python@3.9/lib/pkgconfig:/usr/local/opt/glib/lib/pkgconfig:/usr/local/opt/libssh2/lib/pkgconfig:/usr/local/opt/libpng/lib/pkgconfig:/usr/local/opt/s-lang/lib/pkgconfig' 'PKG_CONFIG_LIBDIR=/usr/lib/pkgconfig:/usr/local/Homebrew/Library/Homebrew/os/mac/pkgconfig/11' % mc -V GNU Midnight Commander 4.8.26 Built with GLib 2.66.4 Built with S-Lang 2.3.2 with terminfo database With builtin Editor With subshell support as default With support for background operations With mouse support on xterm With internationalization support With multiple codepages support Virtual File Systems: cpiofs, tarfs, sfs, extfs, ftpfs, sftpfs, fish Data types: char: 8; int: 32; long: 64; void *: 64; size_t: 64; off_t: 64; }}}" defect new major Future Releases mc-core 4.8.26 subshell common.c init_subshell zsh .zshrc baltazar.bz@… no branch