recipe.sh代码解析（上）

2021SC@SDUSC

recipe.sh的全部代码如下：

#!/bin/bashrequire 'styles'install_recipe() {local recipe_file="$1"if ! [[ -f "${recipe_file}" ]]; thenecho $(error 'Recipe not found:') "${recipe_file}"exit 1filocal rx="${package}${recipe:+:${recipe}}"echo $(info 'Installing recipe:') $(highlight "${rx}")for option in "${recipe_options[@]}"; doecho $(info '- option:') $(print_option "${option}")donecheck_recipe_infoapply_download_filesapply_install_filesapply_patch_files
}print_section() {local section="$1"sed -n '/^'"${section}"':/,/^[^[:space:]#]/ {/^[^[:space:]#]/ !p}'
}check_recipe_info() {local recipe_decl=$(cat "${recipe_file}" |print_section 'recipe' |grep '^[ ]*Rx: ' |sed 's/^[ ]*Rx:[ "'"'"']*\(.*\)[ "'"'"']*$/\1/')[[ -z "${recipe}" ]] || [[ "${recipe_decl}" == "${recipe}" ]] || (echo $(error 'Invalid recipe:') "'${recipe_decl}' does not match file name '${recipe_file}'"exit 1)
}get_filename() {local url="$1"# if a filename is specified, use itif [[ "$url" = *::* ]]; thenecho "${url%%::*}"elseecho "${url##*/}"fi
}download_file() {local url="$1"local filename="$(get_filename $url)"local check_update=""local msg='Downloading file:'if [[ -e "${package_dir}/${filename}" ]]; thencheck_update="-z $filename"msg='Checking for update of external file:'fi(cd "${package_dir}"echo $(info "$msg") $(highlight "$filename")curl -fRL -o "$filename" $check_update "${url#*::}")
}apply_download_files() {if ! grep -q '^download_files:' "${recipe_file}"; thenreturnfilocal file_patterns=($(cat "${recipe_file}" |print_section 'download_files' |sed '/^[ ]*#/ d; s/^[ ]*-[ ]//'))if (( ${#file_patterns[@]} == 0 )); thenreturnfifor _item in ${file_patterns[@]}; dodownload_file $_item || (echo $(error 'Error:') "failed to download files in recipe ${rx}"exit 1)done
}apply_install_files() {if ! grep -q '^install_files:' "${recipe_file}"; thenreturnfilocal file_patterns=($(cat "${recipe_file}" |print_section 'install_files' |sed '/^[ ]*#/ d; s/^[ ]*-[ ]//'))if (( ${#file_patterns[@]} == 0 )); thenreturnfiinstall_files $(cd "${package_dir}"ls ${file_patterns[@]} ||echo $(error 'Error: some files to install are not found.') >&2) || (echo $(error 'Error:') "failed to install files in recipe ${rx}"exit 1)
}apply_patch_files() {if ! grep -q '^patch_files:' "${recipe_file}"; thenreturnfilocal script_header="\
#!/bin/bash
source '${script_dir}/bootstrap.sh'
require 'recipe'
output_dir='${output_dir}'
package='${package}'
recipe='${recipe}'
recipe_options=(${recipe_options[*]}
)
eval \${recipe_options[@]}
"cat "${recipe_file}" |print_section 'patch_files' |sed '{1 i\
'"$(escape_sed_text <<<"${script_header}")"'
# patch filess/^[ ][ ]//s/^\([^[:space:]#]*\):\s*$/patch_file \1 <> "${target_file}"filocal option_list="${recipe_options[*]}"local rx="${package}:${recipe}:${option_list// /,}"if grep -Fq "# Rx: ${rx}" "${target_file}"; thenecho $(info 'Updating patch.')# first remove the existing patchsed '/^# Rx: '"${rx//\//\\/}"' {$/,/^# }$/ d' \"${target_file}" > "${target_file}.new" &&mv "${target_file}.new" "${target_file}"fi# read patch contents from standard inputlocal patch_contents="$(escape_sed_text)"sed -E '/^__patch:$/,/^[^[:space:]#]/ {$ {/^__patch:|^[[:space:]#]/ {a\
# Rx: '"${rx}"' {\
'"${patch_contents}"'
# }q}i\
# Rx: '"${rx}"' {\
'"${patch_contents}"'
# }}}' "${target_file}" > "${target_file}.new" &&mv "${target_file}.new" "${target_file}" || (echo $(error 'Error patching:') "${file_name}"exit 1)
}provide 'recipe'

第一行和最后一行require和provide,一个新建module recipe，一个将recipe版块载入。

在install_recipe函数中，判断recipe_file是否为普通文件。如果不是则会echo一个错误。函数最后调用了另外四个函数。

在print_section函数中，处理文本。不显示以"${section}":，[^[:space:]#]和[^[:space:]#]开头的行，打印其他行。

在check_recipe_info函数中，对recipe_decl进行赋值。先打开“$recipe_file”文件，进行文本过滤和处理后赋值完成。然后进行判断。判断recipe值是否为零或者recipe_decl的值是否和recipe相等。如果满足其中之一，打印一个错误，并以异常状态退出。

get_filename函数则用来获取文件的名称，其中对特殊文件进行了处理。

download_file函数则用来下载文件。

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