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39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
This is an implementation of `realpath -m` (also known as `realpath
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--canonicalize-missing`) for systems without coreutils. The differences to
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`realpath -m` are:
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- different return value when a symlink loop is detected
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- also works if $PWD doesn't exist
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The implementation is not POSIX compatible. Namely, POSIX does not specify the
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`readlink` utility used by this script. Instead, the script takes the pragmatic
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approach and just requires:
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- a POSIX compliant shell (does not require bash), busybox sh will work
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- dirname and basename
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- sed
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- grep -E
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- readlink (without options)
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As a result, the script works well under busybox.
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The script is a port of [a bash script](https://github.com/bashup/realpaths)
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written by PJ Eby and released in the public domain. Likewise, the author of
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this script has waived all copyright on it as well. Differences of this
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implementation to the one in bash:
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- much slower due to excessive forking
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- tests are pure shell without cram and without .devkit
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- functions are named realpath_foo instead of realpath.foo because a dot is
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not allowed in POSIX shell
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To run the tests:
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$ ./test.sh
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To verify that the script works with busybox:
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$ mkdir busybox
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$ busybox --install -s busybox
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$ PATH=$(pwd)/busybox /bin/busybox sh ./test.sh
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