291 lines
8.3 KiB
Bash
Executable file
291 lines
8.3 KiB
Bash
Executable file
#!/bin/sh
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#
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# $NetBSD: fetch,v 1.9 2007/08/04 15:00:29 obache Exp $
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#
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# Copyright (c) 2006 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Johnny C. Lam.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# 3. All advertising materials mentioning features or use of this software
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# must display the following acknowledgement:
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# This product includes software developed by the NetBSD
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# Foundation, Inc. and its contributors.
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# 4. Neither the name of The NetBSD Foundation nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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######################################################################
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#
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# NAME
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# fetch -- fetch files via URLs
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#
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# SYNOPSIS
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# fetch [-c] [-d dir] [-f distinfo] file site ..."
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#
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# DESCRIPTION
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# fetch will attempt to fetch the file from the list of specified
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# sites in the order given. The complete URL to the file on each
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# site should be the concatenation of the specified site and file.
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# If the file cannot be fetched successfully, then we try the next
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# listed site.
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#
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# If the file already exists on the disk and is verified, then
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# no fetch action is taken.
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#
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# OPTIONS
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# -c Verify the checksum for the file. If the checksum
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# does not match, then the fetch is determined to be
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# not successful.
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#
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# -d dir Fetch the files into the specified directory.
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#
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# -f distinfo
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# The path to the distinfo file containing the checksums
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# for the file. The file format should match what is
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# needed by the pkgsrc/mk/checksum/checksum script.
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#
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# -r Resume a previous fetch for the file. In this case,
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# the file is first saved to a ".pkgsrc.resume" file,
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# and is later renamed to the final file name if the
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# complete file has been sucessfully fetched.
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#
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# -v Show the actual command line used to fetch the file
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# from each site.
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#
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# ENVIRONMENT
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# PKGSRCDIR This is a hint to help locate the default
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# checksum script.
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#
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# CHECKSUM This is the path to the checksum script used
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# when "-c" is specified.
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#
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# FETCH_CMD This is the actual command used for transferring
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# files from the various sites.
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#
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# The following are lists of options to pass to ${FETCH_CMD}:
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#
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# FETCH_BEFORE_ARGS
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# These options appear before all other options.
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#
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# FETCH_AFTER_ARGS
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# These options appear after all other options.
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#
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# FETCH_RESUME_ARGS
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# These options appear just after FETCH_BEFORE_ARGS
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# options and cause ${FETCH_CMD} to resume a
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# previous file transfer.
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#
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# FETCH_OUTPUT_ARGS
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# These options specify the name of the local file
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# that will hold the contents of the fetched file.
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#
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######################################################################
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: ${PKGSRCDIR:=/usr/pkgsrc}
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: ${CHECKSUM:=${PKGSRCDIR}/mk/checksum/checksum}
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: ${CP:=cp}
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: ${ECHO:=echo}
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: ${FETCH_CMD:=ftp}
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: ${MKDIR:=mkdir}
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: ${MV:=mv}
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: ${TEST:=test}
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: ${TOUCH:=touch}
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: ${WC:=wc}
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self="${0##*/}"
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usage() {
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${ECHO} 1>&2 "usage: $self [-c] [-f distinfo] [-r] file site ..."
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}
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# Process optional arguments
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checksum=
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distinfo=
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fetchdir=. # A relative directory or "."
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resume=
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verbose=
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while ${TEST} $# -gt 0; do
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case "$1" in
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-c) checksum=yes; shift ;;
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-d) fetchdir="$2"; shift 2 ;;
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-f) distinfo="$2"; shift 2 ;;
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-r) resume=yes; shift ;;
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-v) verbose=yes; shift ;;
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--) shift; break ;;
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-*) ${ECHO} 1>&2 "$self: unknown option -- ${1#-}"
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usage
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exit 1
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;;
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*) break ;;
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esac
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done
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if ${TEST} -n "$checksum" -a -z "$distinfo"; then
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${ECHO} 1>&2 "$self: \`\`-c'' requires \`\`-f distinfo''."
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exit 1
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fi
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if ${TEST} -n "$resume"; then
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if ${TEST} -z "$distinfo"; then
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${ECHO} 1>&2 "$self: \`\`-r'' requires \`\`-f distinfo''."
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resume=
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elif ${TEST} "x${FETCH_RESUME_ARGS}" = "x"; then
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${ECHO} 1>&2 "$self: \`\`-r'' requires FETCH_RESUME_ARGS to be non-empty."
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resume=
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fi
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${TEST} -n "$resume" ||
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${ECHO} 1>&2 "$self: Falling back to non-resume fetch."
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fi
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# Process required arguments
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if ${TEST} $# -lt 2; then
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usage
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exit 1
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fi
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file="$1"; shift
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path="$fetchdir/$file"
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if ${TEST} -n "$distinfo" && ${TEST} ! -f "$distinfo"; then
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${ECHO} 1>&2 "$self: distinfo file missing: $distinfo"
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exit 1
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fi
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# Compute the expected size of the fetched file.
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distsize=
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distunits=
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if ${TEST} -n "$distinfo"; then
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while read d_type d_file d_equals d_size d_units; do
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case "$d_type" in
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Size) ;; # only handle "Size" lines
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*) continue ;;
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esac
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case "$fetchdir" in
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".") ${TEST} "$d_file" = "($file)" || continue ;;
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*) ${TEST} "$d_file" = "($path)" || continue ;;
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esac
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distsize="$d_size"; distunits="$d_units"
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break
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done < $distinfo
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fi
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# verify_file $file
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# If we can checksum the file, then see if it matches the listed
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# checksums in the distinfo file. If we can check the size, then
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# check that instead. We strip off ".pkgsrc.resume" from the
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# filename so that we can verify the checksum for the temporary
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# fetch file as well.
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#
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verify_file() {
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_file="${1#./}"
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${TEST} -f $_file || return 1
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if ${TEST} -n "$checksum"; then
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${CHECKSUM} -s ".pkgsrc.resume" $distinfo ${_file} || return 1
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return 0
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elif ${TEST} -n "$distsize"; then
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_size=`${WC} -c < $_file`
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${TEST} "$_size" -eq "$distsize" || return 1
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return 0
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fi
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return 0;
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}
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# If the file already exists and it verifies, then we don't need to fetch
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# it again.
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#
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if verify_file $path; then
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exit 0
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fi
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${TEST} -d $fetchdir || ${MKDIR} -p $fetchdir 2>/dev/null
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if ${TEST} ! -w $fetchdir; then
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${ECHO} 1>&2 "$self: Cannot write to `cd $fetchdir && pwd`"
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exit 1
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fi
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# Set the name of the output file. In the "resume" case, we initialize
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# the fetch loop by ensuring that the temporary output file already
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# exists.
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#
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outputfile="$file"
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outputpath="$fetchdir/$outputfile"
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if ${TEST} -n "$resume"; then
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outputfile="${file}.pkgsrc.resume"
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outputpath="$fetchdir/$outputfile"
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if ${TEST} ! -f $outputpath; then
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if ${TEST} -f $path; then
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${CP} -f $path $outputpath
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else
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${TOUCH} $outputpath
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fi
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fi
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#
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# If the temporary file verifies, then we don't need to resume
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# fetching it.
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#
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if verify_file $outputpath; then
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${MV} -f $outputpath $path
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exit 0
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fi
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size=`${WC} -c < $outputpath`
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${ECHO} "=> Downloaded size: $size bytes"
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fi
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${TEST} -z "$distsize" || ${ECHO} "=> Total size: $distsize $distunits"
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# Iterate over each site and try to fetch the file. We verify the fetched
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# file to see if we need to try fetching from the next site.
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#
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while ${TEST} $# -gt 0; do
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site="$1"; shift
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( cd $fetchdir
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if ${TEST} -n "$resume"; then
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fetch_cmd="${FETCH_CMD} ${FETCH_BEFORE_ARGS} ${FETCH_RESUME_ARGS} ${FETCH_OUTPUT_ARGS} $outputfile $site$file"
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else
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fetch_cmd="${FETCH_CMD} ${FETCH_BEFORE_ARGS} $site$file ${FETCH_AFTER_ARGS}"
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fi
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${TEST} -z "$verbose" || ${ECHO} "$fetch_cmd"
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$fetch_cmd )
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if ${TEST} $? -ne 0; then
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${ECHO} 1>&2 "$self: Unable to fetch expected file $file"
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continue
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fi
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if verify_file $outputpath; then
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${TEST} -z "$resume" || ${MV} -f $outputpath $path
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break
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else
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${ECHO} 1>&2 "$self: Unable to verify fetched file $file"
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fi
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if ${TEST} -n "$resume"; then
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if ${TEST} -f $path; then
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${CP} -f $path $outputpath
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else
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${TOUCH} $outputpath
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fi
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fi
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done
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if ${TEST} -f $path; then
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exit 0
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else
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exit 1
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fi
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