| 1 | ## compare_shells: bash
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| 2 | ## oils_failures_allowed: 2
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| 3 |
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| 4 | #### var ref to array 'preHooks[@]'
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| 5 | #
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| 6 | # This idiom discussed on
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| 7 | # https://github.com/NixOS/nixpkgs/pull/147629
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| 8 |
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| 9 | show() {
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| 10 | echo show
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| 11 |
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| 12 | # These are actually different
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| 13 | argv.py ${!hooksSlice}
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| 14 |
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| 15 | argv.py ${!hooksSlice+"${!hooksSlice}"}
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| 16 | }
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| 17 |
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| 18 | hooksSlice='preHooks[@]'
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| 19 |
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| 20 | preHooks=()
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| 21 | show
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| 22 |
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| 23 | preHooks=('foo bar' baz)
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| 24 | show
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| 25 |
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| 26 | # WTF this exposes a difference? But not the test case below?
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| 27 |
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| 28 | # What's happening here?
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| 29 | # Uncomment this and get an error in bash about hookSlice, even though we never
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| 30 | # undefined it.
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| 31 |
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| 32 | #wtf=1
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| 33 | #
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| 34 | # line 6: !hooksSlice: unbound variable
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| 35 |
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| 36 | if test -n "$wtf"; then
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| 37 | # 4.4.0(1)-release
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| 38 | # echo $BASH_VERSION
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| 39 |
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| 40 | set -u
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| 41 | preHooks=()
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| 42 | show
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| 43 |
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| 44 | preHooks=('foo bar' baz)
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| 45 | show
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| 46 | fi
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| 47 |
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| 48 | ## STDOUT:
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| 49 | show
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| 50 | []
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| 51 | []
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| 52 | show
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| 53 | ['foo', 'bar', 'baz']
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| 54 | ['foo bar', 'baz']
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| 55 | ## END
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| 56 |
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| 57 | #### Similar to above with set -u
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| 58 | show() {
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| 59 | echo show
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| 60 |
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| 61 | # bash gives an error here - !hookSlice unbound, even though preHooks exists
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| 62 | # OSH currently does the "logical" thing
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| 63 |
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| 64 | # NOT testing this -- I think this is WHAT NIX WORKS AROUND WITH
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| 65 | #argv.py ${!hooksSlice}
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| 66 |
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| 67 | argv.py ${!hooksSlice+"${!hooksSlice}"}
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| 68 | }
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| 69 |
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| 70 | hooksSlice='preHooks[@]'
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| 71 |
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| 72 | set -u
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| 73 | preHooks=()
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| 74 | show
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| 75 |
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| 76 | preHooks=('foo bar' baz)
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| 77 | show
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| 78 |
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| 79 | ## STDOUT:
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| 80 | show
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| 81 | []
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| 82 | show
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| 83 | ['foo bar', 'baz']
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| 84 | ## END
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| 85 |
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| 86 | #### ${!ref} to undefined array
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| 87 |
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| 88 | set -u
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| 89 | shopt -s eval_unsafe_arith || true 2>/dev/null
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| 90 |
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| 91 | #preHooks=()
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| 92 | hookSlice="preHooks[@]"
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| 93 |
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| 94 | argv.py ${!hookSlice+"${!hookSlice}"}
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| 95 |
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| 96 | for element in ${!hookSlice+"${!hookSlice}"}; do
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| 97 | echo $element
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| 98 | done
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| 99 |
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| 100 | ## STDOUT:
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| 101 | []
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| 102 | ## END
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| 103 |
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| 104 | #### ${!ref} to undefined string var is fatal, INCONSISTENT with array
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| 105 | hookSlice='preHooks'
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| 106 |
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| 107 | argv.py ${!hookSlice}
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| 108 |
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| 109 | set -u
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| 110 |
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| 111 | argv.py ${!hookSlice}
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| 112 |
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| 113 | echo end
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| 114 |
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| 115 | ## status: 1
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| 116 | ## STDOUT:
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| 117 | []
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| 118 | ## END
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| 119 |
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| 120 | #### export with dynamic var name +=
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| 121 |
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| 122 | orig() {
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| 123 | export NIX_LDFLAGS${role_post}+=" -L$1/lib64"
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| 124 | }
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| 125 |
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| 126 | new() {
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| 127 | local var_name="NIX_LDFLAGS$role_post"
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| 128 | local value=" -L$1/lib64"
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| 129 |
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| 130 | eval "$var_name"+='$value'
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| 131 | export "$var_name"
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| 132 | }
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| 133 |
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| 134 | role_post='_foo'
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| 135 |
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| 136 | # set -u
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| 137 |
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| 138 | if test -n "${BASH_VERSION:-}"; then
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| 139 | orig one
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| 140 | fi
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| 141 |
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| 142 | declare -p NIX_LDFLAGS_foo # inspect it
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| 143 | unset NIX_LDFLAGS_foo
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| 144 |
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| 145 | new one
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| 146 |
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| 147 | declare -p NIX_LDFLAGS_foo # inspect it
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| 148 |
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| 149 | ## STDOUT:
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| 150 | declare -x NIX_LDFLAGS_foo=" -Lone/lib64"
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| 151 | declare -x NIX_LDFLAGS_foo=" -Lone/lib64"
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| 152 | ## END
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| 153 | ## OK osh STDOUT:
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| 154 | declare -x NIX_LDFLAGS_foo=' -Lone/lib64'
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| 155 | ## END
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| 156 |
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| 157 | #### let idiom can be written in POSIX shell - eval ": \$(( ))"
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| 158 |
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| 159 | for i in 0 1 2; do
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| 160 | echo i=$i
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| 161 |
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| 162 | NIX_ENFORCE_NO_NATIVE=$i
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| 163 |
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| 164 | outputVar=NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu
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| 165 | inputVar=NIX_ENFORCE_NO_NATIVE
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| 166 |
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| 167 | # Original Nix idiom
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| 168 |
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| 169 | if test -n "$BASH_VERSION"; then
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| 170 | let "${outputVar} |= ${!inputVar:-0}" "1"
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| 171 | else
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| 172 | # OSH alternative
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| 173 | eval ": \$(( ${outputVar} |= ${!inputVar:-0} ))"
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| 174 | fi
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| 175 |
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| 176 | echo NIX_ENFORCE_NO_NATIVE=$NIX_ENFORCE_NO_NATIVE
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| 177 | echo NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu=$NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu
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| 178 | echo
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| 179 |
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| 180 | done
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| 181 |
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| 182 |
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| 183 | ## STDOUT:
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| 184 | i=0
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| 185 | NIX_ENFORCE_NO_NATIVE=0
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| 186 | NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu=0
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| 187 |
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| 188 | i=1
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| 189 | NIX_ENFORCE_NO_NATIVE=1
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| 190 | NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu=1
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| 191 |
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| 192 | i=2
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| 193 | NIX_ENFORCE_NO_NATIVE=2
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| 194 | NIX_ENFORCE_NO_NATIVE_x86_64_unknown_linux_gnu=3
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| 195 |
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| 196 | ## END
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| 197 |
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