Skip to content

Commit

Permalink
Escape tilde more gracefully
Browse files Browse the repository at this point in the history
Tilde needs to be escaped only when it's the first character after the white space. Otherwise, we can keep the string unescaped.

This supports bzlmod better, because tilde is used in the directory names.

Users often already escape location function, for example `SJ="$(location @bazel_tools//tools/jdk:singlejar)"; $SJ`. Without the change this becomes `'external/repo~name/singlejar'` and the script fails (no file found).

Location function shouldn't be escaped. But without this change we risk a lot of users will need to fix their scripts.

Closes bazelbuild#16560.

PiperOrigin-RevId: 484226256
Change-Id: I6b71f89a649f8494b76a4446b8f6384421eb89d1
  • Loading branch information
comius authored and fmeum committed Oct 27, 2022
1 parent b88779e commit 763aa8e
Show file tree
Hide file tree
Showing 2 changed files with 14 additions and 3 deletions.
Original file line number Diff line number Diff line change
Expand Up @@ -63,6 +63,8 @@ public final class ShellEscaper extends Escaper {
.or(CharMatcher.inRange('a', 'z')) // that would also accept non-ASCII digits and
.or(CharMatcher.inRange('A', 'Z')) // letters.
.precomputed();
private static final CharMatcher SAFECHAR_MATCHER_WITH_TILDE =
SAFECHAR_MATCHER.or(CharMatcher.is('~')).precomputed();

/**
* Escapes a string by adding strong (single) quotes around it if necessary.
Expand Down Expand Up @@ -98,9 +100,13 @@ public String escape(String unescaped) {
// gets treated as a separate argument.
return "''";
} else {
return SAFECHAR_MATCHER.matchesAllOf(s)
? s
: "'" + STRONGQUOTE_ESCAPER.escape(s) + "'";
if (SAFECHAR_MATCHER.matchesAllOf(s)) {
return s;
}
if (SAFECHAR_MATCHER_WITH_TILDE.matchesAllOf(s) && s.charAt(0) != '~') {
return s;
}
return "'" + STRONGQUOTE_ESCAPER.escape(s) + "'";
}
}

Expand Down
Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,11 @@ public void shellEscape() throws Exception {
assertThat(escapeString("\\'foo\\'")).isEqualTo("'\\'\\''foo\\'\\'''");
assertThat(escapeString("${filename%.c}.o")).isEqualTo("'${filename%.c}.o'");
assertThat(escapeString("<html!>")).isEqualTo("'<html!>'");
assertThat(escapeString("~not_home")).isEqualTo("'~not_home'");
assertThat(escapeString("external/protobuf~3.19.6/src/google"))
.isEqualTo("external/protobuf~3.19.6/src/google");
assertThat(escapeString("external/~install_dev_dependencies~foo/pkg"))
.isEqualTo("external/~install_dev_dependencies~foo/pkg");
}

@Test
Expand Down

0 comments on commit 763aa8e

Please sign in to comment.