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Replace the hash alias with a proper builtin

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This commit replaces the old hash alias with a proper builtin.
I based this builtin off of the code alias uses for handling
`alias -t --`, but with the hack for `--` removed as it has
no use in the new builtin. `alias -t --` will no longer work,
that hack is now gone.

While I was testing this builtin, I found a bug with hash tables
in non-forking subshells. If the hash table of a non-forking
subshell is changed, the parent shell's hash table is also changed.
As an example, running `(hash -r)` was resetting the parent shell's
hash table. The workaround is to force the subshell to fork if the
hash table will be changed.

src/cmd/ksh93/bltins/typeset.c:
 - Move the code for hash out of the alias builtin into a dedicated
   hash builtin. `alias -t --` is no longer supported.

src/cmd/ksh93/data/aliases.c:
 - Remove the old alias for hash from the table of predefined aliases.

src/cmd/ksh93/data/builtins.c:
 - Fix the broken entry for the hash builtin and add a man page for
   the new builtin.

src/cmd/ksh93/sh.1:
 - Replace the entry for the hash alias with a more detailed entry
   for the hash builtin.

src/cmd/ksh93/sh/name.c:
 - Force non-forking subshells to fork if the PATH is being reset
   to workaround a bug with the hash tree.

src/cmd/ksh93/tests/alias.sh:
 - Add a regression test for resetting a hash table, then adding
   a utility to the refreshed hash table.

src/cmd/ksh93/tests/subshell.sh:
 - Add regression tests for changing the hash table in subshells.

(cherry picked from commit d8428a833afe9270b61745ba3d6df355fe1d5499)
This commit is contained in:
Johnothan King 2020-06-10 04:00:35 -07:00 • committed by Martijn Dekker
parent d1bd8f89b7
commit 102868f850
10 changed files with 121 additions and 32 deletions
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5
src/cmd/ksh93/tests/alias.sh
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@ -105,6 +105,11 @@ fi
unalias no_such_alias && err_exit 'unalias should return non-zero for unknown alias'
# ======
# Adding a utility after resetting the hash table should work
hash -r chmod
[[ $(hash) == "chmod=$(whence -p chmod)" ]] || err_exit $'resetting the hash table with `hash -r \'utility\'` doesn\'t work correctly'
# ======
# Attempting to unalias a previously set alias twice should be an error
alias foo=bar