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Make it possible to use "~" or "~user" in the installer.

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I've looked for a while, and it seems that there is no easy way to do
this, not even in bash, and worse with /bin/sh.  So this is kind of
resorting to a simple parsing of the input, and using `eval' if it
starts with a tilde.  Note the hack of not doing that when there is a
space, otherwise the `eval' thing will silently ignore it.

This hack means that it's easy to get into a mess if quotes are used
after a tilde, but that was already the case with the use of `eval' to
handle environment variables.  It's not a real security issue, however,
since we're talking about a user who can just run any command anyway.

Also including a test file for the expansion functionality.  If anyone
wants to improve this code, making the tests pass would reveal the
tricky issues.

[FWIW, I've asked on the #bash channel, and the only serious suggestion
was getting the paths as command-line arguments.  This will, however,
defeat the point of being newbie friendly...]

Closes PR 12893.

original commit: 0814fd5fb5f660bc9698f21445976902317291d1
This commit is contained in:
Eli Barzilay 2012-07-18 22:25:02 -04:00
parent dd17398379
commit 2d17c12ac6
1 changed files with 18 additions and 3 deletions
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21
collects/meta/build/unix-installer/installer-header
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@ -54,6 +54,22 @@ lookfor mkdir
lookfor basename
lookfor dirname
# substitute env vars and tildes
expand_path_var() {
eval "expanded_val=\"\$$1\""
first_part="${expanded_val%%/*}"
if [ "x$first_part" = "x$expanded_val" ]; then
rest_parts=""
else
rest_parts="/${expanded_val#*/}"
fi
case "x$first_part" in
x*" "* ) ;;
x~* ) expanded_val="`eval \"echo $first_part\"`$rest_parts" ;;
esac
eval "$1=\"$expanded_val\""
}
# Need this to make new `tail' respect old-style command-line arguments. Can't
# use `tail -n #' because some old tails won't know what to do with that.
_POSIX2_VERSION=199209
@ -133,11 +149,9 @@ case "x$where" in
x2 ) where="/usr/local${TARGET1}" ;;
x3 ) where="${HOME}${TARGET1}" ;;
x4 | x. | x./ ) where="`pwd`${TARGET1}" ;;
* ) expand_path_var where ;;
esac
# substitute env vars and tildes
where="`eval \"echo \\\"$where\\\"\"`"
###############################################################################
## Default system directories prefixed by $1, mimic configure behavior
## used for unixstyle targets and for wholedir links
@ -332,6 +346,7 @@ unixstyle_install() {
echon "> "; read change_what
read_dir() {
echon "New directory (absolute or relative to $where): "; read new_dir
expand_path_var new_dir
case "$new_dir" in
"/"* ) eval "$1=\"$new_dir\"" ;;
* ) eval "$1=\"$where/$new_dir\"" ;;