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91 lines
2.6 KiB
Bash
Executable File
91 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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#
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# Check if a gx program is installed and if its version is at least
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# equal to a minimum version number.
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#
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# Call it for example like this:
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#
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# $ check_gx_program "gx-go" "0.2.0" "Use 'make gx_upgrade' to install or upgrade gx-go."
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#
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# or:
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#
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# $ check_gx_program "gx" "0.3" "Use 'make gx_upgrade' to install or upgrade gx."
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#
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USAGE="$0 GX_PROGRAM_NAME GX_MIN_VERSION UPGRADE_MSG"
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die() {
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printf >&2 "fatal: %s\n" "$@"
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exit 1
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}
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# Get arguments
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test "$#" -eq "3" || die "This program must be passed exactly 3 arguments" "Usage: $USAGE"
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GX_PROGRAM_NAME="$1"
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GX_MIN_VERSION="$2"
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UPGRADE_MSG="$3"
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die_upgrade() {
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printf >&2 "fatal: %s\n" "$@"
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printf >&2 "=> %s\n" "$UPGRADE_MSG"
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exit 1
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}
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major_number() {
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vers="$1"
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# Hack around 'expr' exiting with code 1 when it outputs 0
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case "$vers" in
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0) echo "0" ;;
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0.*) echo "0" ;;
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*) expr "$vers" : "\([^.]*\).*" || return 1
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esac
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}
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check_at_least_version() {
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MIN_VERS="$1"
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CUR_VERS="$2"
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PROG_NAME="$3"
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# Get major, minor and fix numbers for each version
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MIN_MAJ=$(major_number "$MIN_VERS") || die "No major version number in '$MIN_VERS' for '$PROG_NAME'"
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CUR_MAJ=$(major_number "$CUR_VERS") || die "No major version number in '$CUR_VERS' for '$PROG_NAME'"
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if MIN_MIN=$(expr "$MIN_VERS" : "[^.]*\.\([^.]*\).*"); then
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MIN_FIX=$(expr "$MIN_VERS" : "[^.]*\.[^.]*\.\([^.]*\).*") || MIN_FIX="0"
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else
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MIN_MIN="0"
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MIN_FIX="0"
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fi
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if CUR_MIN=$(expr "$CUR_VERS" : "[^.]*\.\([^.]*\).*"); then
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CUR_FIX=$(expr "$CUR_VERS" : "[^.]*\.[^.]*\.\([^.]*\).*") || CUR_FIX="0"
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else
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CUR_MIN="0"
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CUR_FIX="0"
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fi
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# Compare versions
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VERS_LEAST="$PROG_NAME version '$CUR_VERS' should be at least '$MIN_VERS'"
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test "$CUR_MAJ" -gt $(expr "$MIN_MAJ" - 1) || die_upgrade "$VERS_LEAST"
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test "$CUR_MAJ" -gt "$MIN_MAJ" || {
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test "$CUR_MIN" -gt $(expr "$MIN_MIN" - 1) || die_upgrade "$VERS_LEAST"
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test "$CUR_MIN" -gt "$MIN_MIN" || {
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test "$CUR_FIX" -ge "$MIN_FIX" || die_upgrade "$VERS_LEAST"
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}
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}
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}
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# Check that the gx program exists
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type "$GX_PROGRAM_NAME" >/dev/null 2>&1 || die_upgrade "Program $GX_PROGRAM_NAME is not installed!"
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# Check the gx program version
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VERS_STR=$($GX_PROGRAM_NAME -v 2>&1) || die "'$GX_PROGRAM_NAME -v' failed with output: $VERS_STR"
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GX_CUR_VERSION=$(expr "$VERS_STR" : ".*$GX_PROGRAM_NAME.* version \(.*\)") || die "Invalid '$GX_PROGRAM_NAME -v' output: $VERS_STR"
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check_at_least_version "$GX_MIN_VERSION" "$GX_CUR_VERSION" "$GX_PROGRAM_NAME"
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