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synced 2026-06-07 01:51:14 -03:00
fix umask handling of symbolic modes
This fixes the handling of symbolic umask values. It also removes two invocations of `perl` and all but two `math` commands. Fixes #738
This commit is contained in:
Kurtis Rader
@@ -1,117 +1,129 @@
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# Support the usual (i.e., bash compatible) `umask` UI. This reports or modifies the magic global
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# `umask` variable which is monitored by the fish process.
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function __fish_umask_parse -d "Internal umask function"
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# Test if already a valid octal mask, and pad it with zeros
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if echo $argv | __fish_sgrep -E '^0?[0-7]{1,3}$' >/dev/null
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set -l char_count (echo $argv| wc -c)
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for i in (seq (math 5 - $char_count))
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set argv 0$argv
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end
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echo $argv
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else
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# Test if argument really is a valid symbolic mask
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if not echo $argv | __fish_sgrep -E '^(((u|g|o|a|)(=|\+|-)|)(r|w|x)*)(,(((u|g|o|a|)(=|\+|-)|)(r|w|x)*))*$' >/dev/null
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# This table is indexed by the base umask value to be modified. Each digit represents the new umask
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# value when the permissions to add are applied to the base umask value.
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set __fish_umask_add_table 0101010 2002200 2103210 4440000 4541010 6442200 6543210
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function __fish_umask_add
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set -l mask_digit $argv[1]
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set -l to_add $argv[2]
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set -l mask_table 0000000
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if test $mask_digit -gt 0
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set mask_table $__fish_umask_add_table[$mask_digit]
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end
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set -l new_vals (string split '' $mask_table)
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echo $new_vals[$to_add]
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end
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# This table is indexed by the base umask value to be modified. Each digit represents the new umask
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# value when the permissions to remove are applied to the base umask value.
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set __fish_umask_remove_table 1335577 3236767 3337777 5674567 5775577 7676767 7777777
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function __fish_umask_remove
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set -l mask_digit $argv[1]
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set -l to_remove $argv[2]
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set -l mask_table 1234567
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if test $mask_digit -gt 0
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set mask_table $__fish_umask_remove_table[$mask_digit]
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end
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set -l new_vals (string split '' $mask_table)
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echo $new_vals[$to_remove]
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end
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# This returns the mask corresponding to allowing the permissions to allow. In other words it
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# returns the inverse of the mask passed in.
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set __fish_umask_set_table 6 5 4 3 2 1 0
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function __fish_umask_set
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set -l to_set $argv[1]
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if test $to_set -eq 0
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return 7
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end
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echo $__fish_umask_set_table[$to_set]
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end
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# Given a umask string, possibly in symbolic mode, return an octal value with leading zeros.
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# This function expects to be called with a single value.
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function __fish_umask_parse
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# Test if already a valid octal mask. If so pad it with zeros and return it.
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# Note that umask values are always base 8 so they don't require a leading zero.
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if string match -qr '^0?[0-7]{1,3}$' -- $argv
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string sub -s -4 0000$argv
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return 0
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end
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# Test if argument is a valid symbolic mask. Note that the basic pattern allows one illegal
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# pattern: who and perms without a mode such as "urw". We test for that below after using the
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# pattern to split the rights then testing for that invalid combination.
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set -l basic_pattern '([ugoa]*)([=+-]?)([rwx]*)'
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if not string match -qr "^$basic_pattern(,$basic_pattern)*\$" -- $argv
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printf (_ "%s: Invalid mask '%s'\n") umask $argv >&2
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return 1
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end
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# Split umask into individual digits. We erase the first one because it should always be zero.
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set -l res (string split '' $umask)
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set -e res[1]
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for rights in (string split , $argv)
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set -l match (string match -r "^$basic_pattern\$" $rights)
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set -l scope $match[2]
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set -l mode $match[3]
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set -l perms $match[4]
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if test -n "$scope" -a -z "$mode"
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printf (_ "%s: Invalid mask '%s'\n") umask $argv >&2
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return 1
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end
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set -l implicit_all
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# Insert inverted umask into res variable
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set -l mode
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set -l val
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set -l tmp $umask
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set -l res
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for i in 1 2 3
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set tmp (echo $tmp|cut -c 2-)
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set -l char_count (echo $tmp|cut -c 1)
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set res[$i] (math 7 - $char_count)
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if test -z "$scope"
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set scope a
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end
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if test -z "$mode"
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set mode =
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end
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set -l el (echo $argv|tr , \n)
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for i in $el
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switch $i
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case 'u*'
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set idx 1
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set i (echo $i| cut -c 2-)
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set -l scopes_to_modify
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string match -q '*u*' $scope
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and set scopes_to_modify 1
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string match -q '*g*' $scope
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and set scopes_to_modify $scopes_to_modify 2
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string match -q '*o*' $scope
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and set scopes_to_modify $scopes_to_modify 3
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string match -q '*a*' $scope
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and set scopes_to_modify 1 2 3
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case 'g*'
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set idx 2
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set i (echo $i| cut -c 2-)
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case 'o*'
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set idx 3
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set i (echo $i| cut -c 2-)
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case 'a*'
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set idx 1 2 3
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set i (echo $i| cut -c 2-)
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case '*'
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set implicit_all 1
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set idx 1 2 3
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end
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switch $i
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case '=*'
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set mode set
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set i (echo $i| cut -c 2-)
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case '+*'
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set mode add
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set i (echo $i| cut -c 2-)
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case '-*'
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set mode remove
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set i (echo $i| cut -c 2-)
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case '*'
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if not count $implicit_all >/dev/null
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printf (_ "%s: Invalid mask '%s'\n") umask $argv >&2
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return
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end
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set mode set
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end
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if not echo $perm | __fish_sgrep -E '^(r|w|x)*$' >/dev/null
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printf (_ "%s: Invalid mask '%s'\n") umask $argv >&2
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return
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end
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set val 0
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if echo $i | __fish_sgrep 'r' >/dev/null
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set val 4
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end
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if echo $i | __fish_sgrep 'w' >/dev/null
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set val (math $val + 2)
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end
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if echo $i | __fish_sgrep 'x' >/dev/null
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set val (math $val + 1)
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end
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for j in $idx
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switch $mode
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case set
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set res[$j] $val
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case add
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set res[$j] (perl -e 'print( ( '$res[$j]'|'$val[$j]' )."\n" )')
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case remove
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set res[$j] (perl -e 'print( ( (7-'$res[$j]')&'$val[$j]' )."\n" )')
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end
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end
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set -l val 0
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if string match -q '*r*' $perms
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set val 4
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end
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if string match -q '*w*' $perms
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set val (math $val + 2)
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end
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if string match -q '*x*' $perms
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set val (math $val + 1)
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end
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for i in 1 2 3
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set res[$i] (math 7 - $res[$i])
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for j in $scopes_to_modify
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switch $mode
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case '='
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set res[$j] (__fish_umask_set $val)
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case '+'
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set res[$j] (__fish_umask_add $res[$j] $val)
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case '-'
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set res[$j] (__fish_umask_remove $res[$j] $val)
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end
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end
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echo 0$res[1]$res[2]$res[3]
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end
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echo 0$res[1]$res[2]$res[3]
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return 0
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end
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function __fish_umask_print_symbolic
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set -l val
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set -l res ""
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set -l letter a u g o
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@@ -133,14 +145,12 @@ function __fish_umask_print_symbolic
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end
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echo $res | cut -c 2-
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echo (string split -m 1 '' -- $res)[2]
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end
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function umask --description "Set default file permission mask"
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set -l as_command 0
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set -l symbolic 0
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set -l options
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set -l shortopt pSh
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if not getopt -T >/dev/null
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@@ -164,7 +174,6 @@ function umask --description "Set default file permission mask"
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eval set opt $tmp
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while count $opt >/dev/null
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switch $opt[1]
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case -h --help
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__fish_print_help umask
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@@ -179,15 +188,12 @@ function umask --description "Set default file permission mask"
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case --
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set -e opt[1]
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break
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end
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set -e opt[1]
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end
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switch (count $opt)
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case 0
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if not set -q umask
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set -g umask 113
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@@ -203,8 +209,7 @@ function umask --description "Set default file permission mask"
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end
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case 1
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set -l parsed (__fish_umask_parse $opt)
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if test (count $parsed) -eq 1
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if set -l parsed (__fish_umask_parse $opt)
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set -g umask $parsed
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return 0
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end
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@@ -212,7 +217,6 @@ function umask --description "Set default file permission mask"
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case '*'
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printf (_ '%s: Too many arguments\n') umask >&2
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return 1
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end
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end
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