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https://github.com/flutter/flutter
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379e11b641
Update the flutter and dart scripts' locking mechanism and follow_links function to be more robust and support more platforms. This adds support for using mkdir as a fallback if the system doesn't have flock instead of using shlock, since shlock doesn't work on shared filesystems. It also fixes a problem in the follow_links function where it failed when the link resolved to the root directory.
53 lines
1.9 KiB
Bash
Executable file
53 lines
1.9 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Copyright 2014 The Flutter Authors. All rights reserved.
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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# ---------------------------------- NOTE ---------------------------------- #
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#
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# Please keep the logic in this file consistent with the logic in the
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# `dart.bat` script in the same directory to ensure that Flutter & Dart continue
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# to work across all platforms!
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#
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# -------------------------------------------------------------------------- #
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set -e
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# Needed because if it is set, cd may print the path it changed to.
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unset CDPATH
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# On Mac OS, readlink -f doesn't work, so follow_links traverses the path one
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# link at a time, and then cds into the link destination and find out where it
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# ends up.
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#
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# The returned filesystem path must be a format usable by Dart's URI parser,
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# since the Dart command line tool treats its argument as a file URI, not a
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# filename. For instance, multiple consecutive slashes should be reduced to a
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# single slash, since double-slashes indicate a URI "authority", and these are
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# supposed to be filenames. There is an edge case where this will return
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# multiple slashes: when the input resolves to the root directory. However, if
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# that were the case, we wouldn't be running this shell, so we don't do anything
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# about it.
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#
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# The function is enclosed in a subshell to avoid changing the working directory
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# of the caller.
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function follow_links() (
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cd -P "$(dirname -- "$1")"
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file="$PWD/$(basename -- "$1")"
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while [[ -h "$file" ]]; do
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cd -P "$(dirname -- "$file")"
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file="$(readlink -- "$file")"
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cd -P "$(dirname -- "$file")"
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file="$PWD/$(basename -- "$file")"
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done
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echo "$file"
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)
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PROG_NAME="$(follow_links "$BASH_SOURCE")"
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BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
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# To define `shared::execute()` function
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source "$BIN_DIR/shared.sh"
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shared::execute "$@"
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