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Normalize the given input paths by removing /./ components before using them

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/tools/make/trunk@16805 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Nicola Pero 2003-05-27 08:55:26 +00:00
parent 3457a50771
commit 77a45e749b
1 changed files with 39 additions and 8 deletions
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47
relative_path.sh
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@ -22,9 +22,7 @@
# which, when appended to the first one, gives the second one ... more
# precisely, the path of minimum length with this property.
#
# <NB: the paths must be absolute, and can only contain empty path components
# (ie, as in /usr/./GNUstep/) only in the final part of the paths. This is
# a restriction in the implementation ... but it is enough for our needs.>
# <NB: the paths must be absolute.>
#
# for example,
#
@ -45,8 +43,8 @@
# it's not obvious what the relationship is between the two paths, and
# you only have the absolute paths) we do -
#
# cd /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so
# $(LN_S) `$(RELATIVE_PATH_SCRIPT) /usr/GNUstep/System/Frameworks/nicola.framework/Versions/Current/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/`
# cd /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/
# $(LN_S) `$(RELATIVE_PATH_SCRIPT) /usr/GNUstep/System/Frameworks/nicola.framework/Versions/Current/ix86/linux-gnu/gnu-gnu-gnu/libnicola.so /usr/GNUstep/System/Library/Libraries/ix86/linux-gnu/gnu-gnu-gnu/` libnicola.so
#
# which creates the link. We need to use the minimum path because
# that is the most relocatable possible path. I consider all this a
@ -77,12 +75,45 @@ fi
# Our second argument is a path like /xxx/yyy/kkk/nnn/ppp
#
# We first want to remove the common root -- we want to get into having
# /zzz/ccc/tt and /kkk/nnn/ppp.
# Step zero is normalizing the paths by removing any /./ component
# inside the given paths (these components can occur for example when
# enable-flattened is used).
tmp_IFS="$IFS"
IFS=/
# Normalize a by removing any '.' path component.
normalized_a=""
for component in $a; do
if [ -n "$component" ]; then
if [ "$component" != "." ]; then
normalized_a="$normalized_a/$component"
fi
fi
done
a="$normalized_a"
# Normalize b by removing any '.' path component.
normalized_b=""
for component in $b; do
if [ -n "$component" ]; then
if [ "$component" != "." ]; then
normalized_b="$normalized_b/$component"
fi
fi
done
b="$normalized_b"
IFS="$tmp_IFS"
# Step one: we first want to remove the common root -- we want to get
# into having /zzz/ccc/tt and /kkk/nnn/ppp.
# We first try to match as much as possible between the first and the second
# So we loop on the fields in the second. The common root must not contain
# empty path components (/./) for this to work.
# empty path components (/./) for this to work, but we have already filtered
# those out at step zero.
tmp_IFS="$IFS"
IFS=/
partial_b=""