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support both xxd and hexdump in permit

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This commit is contained in:
Connor Olding 2024-07-16 10:51:32 -07:00
parent f53e9865df
commit e8623a568a
1 changed files with 11 additions and 2 deletions
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13
sh/permit
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@ -1,6 +1,15 @@
#!/usr/bin/env sh
# YES_ZSH YES_BASH YES_DASH YES_ASH
__permit_hex() {
if xxd -l 0 2>/dev/null; then
__permit_hex() { exec xxd -p -l4 -- "$@"; }
else
__permit_hex() { exec hexdump -ve '1 1 "%02x"' -n4 -- "$@"; }
fi
__permit_hex "$@"
}
permit() { ### @- conditionally set executable permissions on each of its arguments.
### flags:
### * `-a` -- automatic: skip any files whose contents do not begin with
@ -80,8 +89,8 @@ permit() { ### @- conditionally set executable permissions on each of its argume
elif ! [ -e "$__permit_f" ]; then
set -- "$@" "$__permit_f"
elif [ "$__permit_a" = 1 ] && ! [ -d "$__permit_f" ]; then
__permit_4="$(exec hexdump -ve '1 1 "%02X"' -n4 -- "$__permit_f")" || __permit=$?
case "$__permit_4" in (7F454C46) false;; (2321*) false;; (4D5A*) false;;
__permit_4="$(__permit_hex "$__permit_f")" || __permit=$?
case "$__permit_4" in (7f454c46) false;; (2321*) false;; (4d5a*) false;;
esac || set -- "$@" "$__permit_f" # runs when a case matches
elif [ "-$__permit_m" "$__permit_f" ]; then
set -- "$@" "$__permit_f"