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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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17
src/cmd/ksh93/sh.1
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@ -796,8 +796,6 @@ but can be unset or redefined:
.TP
.B "functions=\(fmtypeset \-f\(fm"
.TP
.B "hash=\(fmalias \-t \-\^\-\(fm"
.TP
.B "history=\(fmhist \-l\(fm"
.TP
.B "integer=\(fmtypeset \-li\(fm"
@ -6126,6 +6124,21 @@ The option
.B #
can only be specified as the first option.
.TP
\f3hash\fP \*(OK \f3\-r\fP \f2\^\fP\*(CK \*(OK \f3utility\^\fP \*(CK
The
.BR hash
command can be used to display or modify the hash table.
The hash table is a list of the most recently used programs
and their locations.
If
.I utility\^
is supplied,
.BR hash
will add that utility to the hash table.
If
.B \-r
is selected, the hash table is reset.
.TP
.PD 0
\f3hist\fP \*(OK \f3\-e\fP \f2ename\^\fP \ \*(CK \*(OK \f3\-nlr\^\fP \*(CK \*(OK \f2first\^\fP \*(OK \f2last\^\fP \*(CK \*(CK
.TP