mirror of
https://github.com/notwa/rc
synced 2024-10-31 17:14:36 -07:00
137 lines
4.5 KiB
Bash
137 lines
4.5 KiB
Bash
#!/usr/bin/env sh
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# YES_ZSH
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# YES_BASH
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# YES_DASH
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maybesudo_() { ### @-
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### mimic certain features of `sudo` for systems without it installed.
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### as it stands, this mostly just handles some environment variables.
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local name
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local env_cleanup=0
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while getopts :AEHKPSVbhiklnsvC:U:g:p:r:t:u: name; do
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case $name in
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K|V|k)
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# K: sure kill
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# V: version
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# k: kill
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note 'maybesudo: your system does not have sudo installed!'
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return 0
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;;
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h)
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printf "%s\n" 'maybesudo - a dumb utility for systems without sudo'
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printf "\n"
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printf "%s\n" 'usage: maybesudo -h | -V'
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printf "%s\n" 'usage: maybesudo [command]'
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return 0
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;;
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A|E|H|P|S|n|p)
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# A: askpass
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# E: preserve environment
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# H: HOME
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# P: preserve group vector
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# S: stdin (password)
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# n: non-interactive
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# p: prompt
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note 'maybesudo: option has no effect --' "'$name'"
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;;
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C|U|b|g|i|l|r|s|t)
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# C: close from (fd)
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# U: other user (in conjunction wiht -l)
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# b: background
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# g: group
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# i: simulate initial login (TODO)
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# l: list
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# r: role (SELinux)
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# s: shell (TODO)
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# t: type (SELinux)
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note "maybesudo: unsupported option --" "'$name'"
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return 1
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;;
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u) # user
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if [ -z "$USER" -o "$OPTARG" != "$USER" ]; then
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note 'maybesudo: users other than yourself are unsupported!'
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return 1
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fi
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env_cleanup=1
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;;
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:)
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note 'maybesudo: option requires an argument --' "'$OPTARG'"
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return 1
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;;
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default)
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note 'maybesudo: invalid option --' "'$OPTARG'"
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return 1
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;;
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esac
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done
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shift $((OPTIND-1))
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if [ "$env_cleanup" = 1 ]; then
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(
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# portably listing exported variable names is virtually impossible
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# without the blessing of null-terminated strings, so don't even try.
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# just export the bare minimum that a fairly stock sudo would.
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# $path is special in zsh, so call it pathy instead.
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local colors display dpkg_colors home hostname krb5ccname \
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ls_colors pathy ps1 ps2 user username xauthority xauthorization
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[ -z "$COLORS" ] || colors=COLORS="$COLORS"
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[ -z "$DISPLAY" ] || display=DISPLAY="$DISPLAY"
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[ -z "$DPKG_COLORS" ] || dpkg_colors=DPKG_COLORS="$DPKG_COLORS"
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[ -z "$HOME" ] || home=HOME="$HOME"
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[ -z "$HOSTNAME" ] || hostname=HOSTNAME="$HOSTNAME"
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[ -z "$KRB5CCNAME" ] || krb5ccname=KRB5CCNAME="$KRB5CCNAME"
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[ -z "$LS_COLORS" ] || ls_colors=LS_COLORS="$LS_COLORS"
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[ -z "$PATH" ] || pathy=PATH="$PATH"
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[ -z "$PS1" ] || ps1=PS1="$PS1"
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[ -z "$PS2" ] || ps2=PS2="$PS2"
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[ -z "$USER" ] || user=USER="$USER"
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[ -z "$USERNAME" ] || username=USERNAME="$USERNAME"
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[ -z "$XAUTHORITY" ] || xauthority=XAUTHORITY="$XAUTHORITY"
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[ -z "$XAUTHORIZATION" ] || xauthorization=XAUTHORIZATION="$XAUTHORIZATION"
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# don't eat up precious command space with dumb colors.
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# xargs --show-limits says:
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# Maximum length of command we could actually use: 5080
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[ "${#ls_colors}" -le 1024 ] || ls_colors==
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# sudo also sets SUDO_COMMAND, SUDO_GID, SUDO_UID, SUDO_USER, and MAIL,
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# but who needs those?
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# env seems to treat arguments of "=" as a no-op across GNU and busybox.
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env -i \
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"${colors:-=}" \
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"${display:-=}" \
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"${dpkg_colors:-=}" \
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"${home:-=}" \
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"${hostname:-=}" \
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"${krb5ccname:-=}" \
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"${ls_colors:-=}" \
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"${pathy:-=}" \
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"${ps1:-=}" \
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"${ps2:-=}" \
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"${user:-=}" \
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"${username:-=}" \
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"${xauthority:-=}" \
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"${xauthorization:-=}" \
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"$@"
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)
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else
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# run it in a subshell so it won't affect ours.
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# TODO: run through env anyway for consistency.
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# (`maybesudo export` should fail)
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( "$@"; )
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fi
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# don't put any code here or you'll clobber $?.
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}
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[ "${SOURCING:-0}" -gt 0 ] || maybesudo_ "$@"
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