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70 lines
2.8 KiB
Bash
Executable File
70 lines
2.8 KiB
Bash
Executable File
#!/bin/sh
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# Drop whole-line `#` comments from the shell files under root/ IN A BUILD TREE.
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#
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# ./strip-shell.sh <dir>
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#
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# Same trade as strip-templates.sh and build-css.sh: the reader gets the comments from git, the
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# router gets the bytes (uci-defaults is 51% comment lines, keep.d 77%).
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#
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# ONLY a line whose first non-blank character is `#`, and never the shebang. sh has no block-comment
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# syntax, so the only way a `#` can be something else is inside a string or a heredoc; a trailing
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# `# …` after code is left alone because the line does not START with it, and there is no heredoc
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# anywhere under root/ (grepped, and refused below in the files this loop rewrites).
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#
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# Files are matched by their shebang or by living under a shell directory (uci-defaults, keep.d),
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# never by extension — none of them have one.
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set -e
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DIR="${1:-}"
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[ -n "$DIR" ] && [ -d "$DIR" ] || { echo "usage: strip-shell.sh <dir>" >&2; exit 1; }
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# ONE trap, covering the file list and whatever temp the loop holds when it dies. Under `set -e` an
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# awk failure leaves `<file>.tmp<pid>` behind, and stage.sh runs this over the staged payload, so the
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# leftover is copied into the package: a `30_luci-theme-footstrap.tmp1234` under /etc/uci-defaults is
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# a file the ROUTER executes and deletes on its next boot.
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LIST=$(mktemp)
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CUR=""
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trap 'rm -f "$LIST" ${CUR:+"$CUR"}' EXIT INT TERM
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# The list goes through a file rather than `for f in $(find …)`: that splits on whitespace, so a
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# checkout under a path with a space fed the loop two halves of a directory name.
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find "$DIR" -type f | sort > "$LIST"
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before=0
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after=0
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found=0
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while IFS= read -r f; do
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# shell only: a shebang, or the one comment-only manifest this package ships (keep.d). The uci
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# config and the rpcd ACL are deliberately left alone.
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case "$(head -c 2 "$f")" in
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'#!') ;;
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*) case "$f" in */keep.d/*) ;; *) continue ;; esac ;;
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esac
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# The heredoc refusal, over the files this loop actually REWRITES. Run over the whole tree it
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# aborted the build on a `<<` in the ACL or the uci config, neither of which is touched here.
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if grep -q '<<' "$f"; then
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echo "strip-shell: a heredoc in $f — refusing (a '#' line inside one is DATA, not a comment)" >&2
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exit 1
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fi
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found=$((found + 1))
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b=$(wc -c < "$f")
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CUR="$f.tmp$$"
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awk 'NR == 1 && /^#!/ { print; next }
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/^[ \t]*#/ { next }
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{ print }' "$f" > "$CUR"
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# never leave a file that lost its shebang or came out empty
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if [ ! -s "$CUR" ]; then
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echo "strip-shell: $f came out empty — refusing" >&2
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exit 1
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fi
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cat "$CUR" > "$f" # cat, not mv: keep the original mode (uci-defaults must stay +x)
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rm -f "$CUR"
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CUR=""
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a=$(wc -c < "$f")
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before=$((before + b))
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after=$((after + a))
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done < "$LIST"
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[ "$found" -gt 0 ] || { echo "strip-shell: no shell file under $DIR" >&2; exit 1; }
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echo "strip-shell: $found file(s), $before -> $after bytes (-$((before - after)))"
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